TY  - JOUR
A1  - Hoffmann, Svenja Sarah Helen
A1  - Cortes-Garcia, Laura
A1  - Warschburger, Petra
T1  - Weight/shape and muscularity concerns and emotional problems in adolescent boys and girls
BT  - A cross-lagged panel analysis
JF  - Journal of adolescence
N2  - Introduction: The goal of the present study was to identify the prospective relations between weight/shape and muscularity concerns and emotional problems in adolescents. Methods: Self-report data of 966 German male and female adolescents were analyzed in a cross lagged panel design. Results: Analyses of latent means revealed significant correlations between weight/shape concern and emotional problems as well as between muscularity concern and emotional problems in both genders. Moreover, weight/shape concern predicted emotional problems prospectively, but only in girls. Regarding muscularity concern, we could not find any prospective relation with emotional problems In boys or girls from the general population. Conclusions: It is assumed that as appearance is highly relevant for the self-concept in girls, concerns about the look might promote emotional problems. Thus, weight/shape concern should be addressed in the prevention of emotional problems in adolescent girls, whereas further research is necessary investigating the contribution of muscularity concern in this context.
KW  - Weight/shape concern
KW  - Muscularity concern
KW  - Depressive symptoms
KW  - Adolescents
KW  - Cross-lagged panel analysis
Y1  - 2018
U6  - https://doi.org/10.1016/j.adolescence.2018.07.005
SN  - 0140-1971
SN  - 1095-9254
VL  - 68
SP  - 70
EP  - 77
PB  - Elsevier
CY  - London
ER  - 
TY  - JOUR
A1  - Cortes-Garcia, Laura
A1  - Hoffmann, Svenja
A1  - Warschburger, Petra
A1  - Senra, Carmen
T1  - Exploring the reciprocal relationships between adolescents' perceptions of parental and peer attachment and disordered eating
BT  - a multiwave cross-lagged panel analysis
JF  - International Journal of eating disorders
N2  - Objective This prospective study explored bidirectional associations between attachment quality towards mother, father, and peers and disordered eating among a large population-based sample of boys and girls in the transition from preadolescence to adolescence. Specifically, we examined whether insecure attachment relationships emerged as a risk factor for or as an outcome of disordered eating. Method A population-based sample of 904 adolescent girls and boys was assessed four times, at baseline (T1; M-age = 10.8 years) and at 2-, 4-, and 6-year follow-up (T2, T3, and T4). Prospective data were analyzed using cross-lagged panel models for each attachment figure (i.e., mother, father, peers) in a multigroup design to compare genders. Results Better attachment to the mother led to less pronounced disturbed eating in girls across the entire age range and in boys across two time periods. In girls, more pronounced disordered eating at T3 predicted worse attachment to the mother at T4 and better attachment to the father at T1 predicted less disturbed eating at T2. In boys, disordered eating at T1 predicted better attachment to the father at T2. Concerning peer attachment, better attachment at T1 predicted disordered eating at T2, in boys only. No other significant cross-lagged effects emerged. Discussion These findings highlight the differential and gender-specific contribution of attachment figures to the development of disordered eating in adolescence. Programs aimed at improving communication and trust in the relationship with parents might be promising in the prevention of disordered eating and the subsequent deterioration of parent-child attachment relationships.
KW  - adolescents
KW  - attachment
KW  - cross-lagged panel analysis
KW  - disordered eating
KW  - gender
Y1  - 2019
U6  - https://doi.org/10.1002/eat.23086
SN  - 0276-3478
SN  - 1098-108X
VL  - 52
IS  - 8
SP  - 924
EP  - 934
PB  - Wiley
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Hoffmann, Svenja
A1  - Warschburger, Petra
T1  - Patterns of body image concerns in adolescence and early adulthood
BT  - a latent profile analysis
JF  - Eating Behaviors
N2  - The present study aimed at identifying latent profiles of body image concerns in adolescents and young adults. Subsequently, associations between these profiles and potentially harmful behaviors are examined. Self-report data of 758 male and female adolescents, aged 14 to 22 years, were analyzed. Participants provided demographic and anthropometric data and completed surveys on weight/shape and muscularity concern as well as on disturbed eating behaviors and dysfunctional exercise. Latent profile analyses of weight/shape concern and muscularity concern were performed separately for each gender. The analyses indicated three-class solutions in men and women. In both genders, the inconspicuous class, characterized by small amounts of weight/shape and muscularity concerns, was the largest one (86% in men, 68% in women). Whereas 10% of the men and 23% of the women were assigned to the borderline class, 4% of the men and 8% of the women formed the conspicuous class (marked weight/shape and muscularity concerns). Between genders, the degrees of muscularity concern differed in the borderline and inconspicuous classes, while the degrees of weight/shape concern differed in the inconspicuous class only. The comparable degrees of weight/shape and muscularity concerns in men and women in the affected classes underline the relevance of both aspects in both genders. Classes could be distinguished by harmful behaviors, like restrained eating or emotional exercise, proving the clinical significance of body image concerns.
KW  - Weight concern
KW  - Shape concern
KW  - Muscularity concern
KW  - Adolescent
KW  - Young adult
KW  - Latent profile analysis
Y1  - 2018
U6  - https://doi.org/10.1016/j.eatbeh.2018.02.002
SN  - 1471-0153
SN  - 1873-7358
VL  - 29
SP  - 28
EP  - 34
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Hoffmann, Svenja
A1  - Warschburger, Petra
T1  - Weight, shape, and muscularity concerns in male and female adolescents
BT  - predictors of change and influences on eating concern
JF  - The international journal of eating disorders
N2  - Objective:
The purpose of this study was to examine the impact of age and weight status on adolescents' body dissatisfaction and its change over 20 months in a gender-comparing design. The influence of body image concern on eating concern was also investigated.
Method:
In a prospective study, 675 male and female adolescents aged 12–16 were assessed using self-report questionnaires on weight, shape, muscularity, and eating concerns. Height and weight measurements were taken by trained personnel. Data were analyzed using structural equation modeling.
Results:
Analyses of latent means revealed more pronounced weight/shape concern in females than males and more pronounced muscularity concern in males than females. Weight/shape concern increased in females over time, whereas muscularity concern remained stable in both genders. Baseline levels of weight/shape concern could be predicted by age and weight status in females and by weight status in males. The only predictor of change in weight/shape concern was weight status in males. Baseline levels of muscularity concern could be predicted by age in females and by weight status in males. Similar effects were found for changes in muscularity concern in both genders. Increases in weight/shape and muscularity concern were associated with more pronounced eating concern.
Discussion:
The results confirm gender differences in distinctive facets of body image concern and its prediction. The relevance of increase in body image concern in adolescents is underlined by its association with eating concern in both genders. Further explanatory variables for change in body dissatisfaction should be examined in future studies.
KW  - weight and shape concern
KW  - muscularity concern
KW  - eating concern
KW  - gender
KW  - adolescence
KW  - prospective
Y1  - 2016
U6  - https://doi.org/10.1002/eat.22635
SN  - 0276-3478
SN  - 1098-108X
VL  - 50
IS  - 2
SP  - 139
EP  - 147
PB  - Wiley
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Schlegl, Sandra
A1  - Dittmer, Nina
A1  - Hoffmann, Svenja
A1  - Voderholzer, Ulrich
T1  - Self-reported quantity, compulsiveness and motives of exercise in patients with eating disorders and healthy controls
BT  - differences and similarities
JF  - Journal of eating disorders
N2  - Background: Compulsive exercise (CE) is a frequent symptom in patients with eating disorders (EDs). It includes, in addition to quantitatively excessive exercise behaviour, a driven aspect and specific motives of exercise. CE is generally associated with worse therapy outcomes. The aims of the study were to compare self-reported quantity of exercise, compulsiveness of exercise as well as motives for exercise between patients with anorexia nervosa (AN), bulimia nervosa (BN) and healthy controls (HC). Additionally, we wanted to explore predictors of compulsive exercise (CE) in each group. Methods: We investigated 335 female participants (n = 226 inpatients, n = 109 HC) and assessed self-reported quantity of exercise, compulsiveness of exercise (Compulsive Exercise Test), motives for exercise (Exercise Motivations Inventory-2), ED symptoms (Eating Disorder Inventory-2), obsessive-compulsiveness (Obsessive-Compulsive Inventory-Revised), general psychopathology (Brief Symptom Inventory-18) and depression (Beck Depression Inventory-2). Results: Both patients with AN and BN exercised significantly more hours per week and showed significantly higher CE than HC; no differences were found between patients with AN and BN. Patients with EDs and HC also partly varied in motives for exercise. Specific motives were enjoyment, challenge, recognition and weight management in patients with EDs in contrast to ill-health avoidance and affiliation in HC. Patients with AN and BN only differed in regard to exercise for appearance reasons in which patients with BN scored higher. The most relevant predictor of CE across groups was exercise for weight and shape reasons. Conclusions: Exercise behaviours and motives differ between patients with EDs and HC. CE was pronounced in both patients with AN and BN. Therefore, future research should focus not only on CE in patients with AN, but also on CE in patients with BN. Similarities in CE in patients with AN and BN support a transdiagnostic approach during the development of interventions specifically targeting CE in patients with EDs.
KW  - Anorexia nervosa
KW  - Bulimia nervosa
KW  - Eating disorders
KW  - Compulsive exercise
KW  - Motives for exercise
KW  - Inpatient
KW  - Predictor
KW  - Healthy controls
Y1  - 2018
U6  - https://doi.org/10.1186/s40337-018-0202-6
SN  - 2050-2974
VL  - 6
PB  - BMC
CY  - London
ER  - 
TY  - JOUR
A1  - Hoffmann, Svenja
A1  - Warschburger, Petra
T1  - Prospective relations among internalization of beauty ideals, body image concerns, and body change behaviors
BT  - Considering thinness and muscularity
JF  - Body image : an international journal of research
N2  - Common models propose that the internalization of societal beauty ideals influences disordered eating behaviors and muscularity-oriented behaviors via body image concerns. However, previous studies addressing these pathways have been mainly cross-sectional and primarily included female samples. We investigated these pathways prospectively in male and female adolescents and young adults, examining two pathways: a ‘weight/shape pathway,’ linking thin-ideal internalization, weight/shape concern, and restrained eating, and a ‘muscularity pathway,’ linking athletic-ideal internalization, muscularity concern, and muscularity-oriented behavior. Across three time points, 973 participants from the German general population were assessed. Although the hypothesized pathways could not be supported in their complete temporal sequence, several hypothesized pathways occurred across two time points. Among others, weight/shape concern predicted restrained eating and the athletic ideal played a prominent role in the prediction of muscularity-oriented behavior in both genders.
KW  - Weight/shape concern
KW  - Muscularity concern
KW  - Internalization
KW  - Restrained eating
KW  - Muscularity-oriented behavior
KW  - Prospective path analysis
Y1  - 2019
U6  - https://doi.org/10.1016/j.bodyim.2019.01.011
SN  - 1740-1445
SN  - 1873-6807
VL  - 28
SP  - 159
EP  - 167
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Hoffmann, Svenja
A1  - Warschburger, Petra
T1  - Body image in obese children and adolescents. Body dissatisfaction and body size perception in relation to quality of life and weight loss
JF  - Psychotherapeut
N2  - Body dissatisfaction and an unrealistic perception of own body size are particularly common in obese children and adolescents; however, little is known about the association with weight-related quality of life and the impact on successful long-term weight loss.
 At the beginning of an inpatient child obesity rehabilitation program, 408 children and adolescents aged 9-12 years completed a questionnaire on body image (body silhouettes) and a body weight-specific questionnaire for overweight and obese children and adolescents (GW-LQ-KJ) on quality of life. Height and weight were measured by a physician at the beginning and 1 year after inpatient hospitalization.
 Of the participants 91.9 % reported body dissatisfaction and 75.7 % underestimated their own body size. There were no gender-specific differences in body dissatisfaction but boys perceived their body size more realistically than girls. Participants with body dissatisfaction and realistic body size perception showed a reduced weight-related quality of life. Those participants who realistically perceived their body size also lost less weight in the long term.
 The subjective underestimation of body size proved to be important for reduced weight-related quality of life and more pronounced long-term weight loss; therefore, body image should be taken into account in multimodal treatment programs.
KW  - Body size perception
KW  - Quality of life
KW  - Weight loss
KW  - Obesity
KW  - Questionnaire
Y1  - 2015
U6  - https://doi.org/10.1007/s00278-015-0060-5
SN  - 0935-6185
SN  - 1432-2080
VL  - 60
IS  - 6
SP  - 498
EP  - 504
PB  - Springer
CY  - New York
ER  - 
TY  - GEN
A1  - Schlegl, Sandra
A1  - Dittmer, Nina
A1  - Hoffmann, Svenja
A1  - Voderholzer, Ulrich
T1  - Self-reported quantity, compulsiveness and motives of exercise in patients with eating disorders and healthy controls
BT  - differences and similarities
T2  - Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe
N2  - Background: Compulsive exercise (CE) is a frequent symptom in patients with eating disorders (EDs). It includes, in addition to quantitatively excessive exercise behaviour, a driven aspect and specific motives of exercise. CE is generally associated with worse therapy outcomes. The aims of the study were to compare self-reported quantity of exercise, compulsiveness of exercise as well as motives for exercise between patients with anorexia nervosa (AN), bulimia nervosa (BN) and healthy controls (HC). Additionally, we wanted to explore predictors of compulsive exercise (CE) in each group.

Methods: We investigated 335 female participants (n = 226 inpatients, n = 109 HC) and assessed self-reported quantity of exercise, compulsiveness of exercise (Compulsive Exercise Test), motives for exercise (Exercise Motivations Inventory-2), ED symptoms (Eating Disorder Inventory-2), obsessive-compulsiveness (Obsessive-Compulsive Inventory-Revised), general psychopathology (Brief Symptom Inventory-18) and depression (Beck Depression Inventory-2).

Results: Both patients with AN and BN exercised significantly more hours per week and showed significantly higher CE than HC; no differences were found between patients with AN and BN. Patients with EDs and HC also partly varied in motives for exercise. Specific motives were enjoyment, challenge, recognition and weight management in patients with EDs in contrast to ill-health avoidance and affiliation in HC. Patients with AN and BN only differed in regard to exercise for appearance reasons in which patients with BN scored higher. The most relevant predictor of CE across groups was exercise for weight and shape reasons.

Conclusions: Exercise behaviours and motives differ between patients with EDs and HC. CE was pronounced in both patients with AN and BN. Therefore, future research should focus not only on CE in patients with AN, but also on CE in patients with BN. Similarities in CE in patients with AN and BN support a transdiagnostic approach during the development of interventions specifically targeting CE in patients with EDs.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 687 
KW  - anorexia nervosa
KW  - bulimia nervosa
KW  - eating disorders
KW  - compulsive exercis
KW  - motives for exercise
KW  - inpatient
KW  - predictor
KW  - healthy controls
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-426831
SN  - 1866-8372
IS  - 687
ER  - 
TY  - THES
A1  - Hoffmann, Svenja Sarah Helen
T1  - Gewichts-/Figursorgen und Muskelsorgen bei Jugendlichen und jungen Erwachsenen
T1  - Weight/shape and muscularity concerns in adolescents and young adults
BT  - Auftreten, Einflussfaktoren und Folgen
BT  - occurence, influences and consequences
N2  - Die Unzufriedenheit mit Gewicht und Figur gilt als bedeutsamer Risikofaktor für die Entstehung von gestörtem Essverhalten und Essstörungen im Vollbild und steht mit reduziertem psychischem Wohlbefinden in Zusammenhang. Aufgrund der hohen klinischen Relevanz wurden Gewichts- /Figursorgen v. a. bei weiblichen Jugendlichen und jungen Erwachsenen vielfach untersucht. Muskelsorgen – als männliches Äquivalent betrachtet – stießen erst im Verlauf der letzten 20 Jahren auf vermehrtes Interesse in der psychologischen Forschung. Die aktuellen westlichen Schönheitsideale legen jedoch die Relevanz von Gewicht, Figur und Muskulosität in Bezug auf aussehensbezogene Sorgen bei beiden Geschlechtern nahe. In der vorliegenden Dissertation wurden deshalb die folgenden Fragestellungen thematisiert: (1) Auftreten: Wie sind Gewichts- /Figursorgen und Muskelsorgen bei weiblichen und männlichen Jugendlichen und jungen Erwachsenen ausgeprägt? Wie verändern sie sich über 20 Monate? Welche Profile lassen sich bezüglich ihres Auftretens definieren? (2) Einflussfaktoren: Welchen Einfluss haben Alter, Gewichtsstatus, negative Affektivität und Internalisierung des Schönheitsideals auf Gewichts- /Figursorgen und Muskelsorgen? (3) Folgen: Welchen Einfluss haben Gewichts-/Figursorgen und Muskelsorgen auf essensbezogene Sorgen, restriktives Essverhalten, Binge Eating, zwanghaftes Bewegungsverhalten, Verhaltensweisen zum Muskelaufbau und negative Affektivität?
Es konnte gezeigt werden, dass mehr Mädchen von aussehensbezogenen Sorgen betroffen sind und diese im Mittel höher ausgeprägte Gewichts-/Figursorgen zeigen, während Jungen höher ausgeprägte Muskelsorgen berichten. Eine differenzierte Analyse verschiedener Subgruppen legt jedoch nahe, dass es in Gruppen mit ausgeprägten aussehensbezogenen Sorgen keine Geschlechtsunterschiede bezüglich Gewichts-/Figursorgen und Muskelsorgen gibt. Dieser Befund unterstreicht die Relevanz beider Aspekte bei beiden Geschlechtern und legt eine entsprechende Erfassung in zukünftigen Studien nahe. Des Weiteren ergaben sich Ansatzpunkte für die Notwendigkeit der Prävention bei Mädchen mit Übergewicht/Adipositas im späten Jugend- und frühen Erwachsenenalter ebenso wie bei Jungen mit Untergewicht sowie Übergewicht/Adipositas. Neben Gewichts-/Figursorgen sollte bei weiblichen Jugendlichen und jungen Erwachsenen auch die Internalisierung des schlanken Ideals thematisiert werden, um der Entstehung von auffälligem Ess- und Bewegungsverhalten vorzubeugen. Bei beiden Geschlechtern zeigte sich außerdem die Internalisierung des athletischen Ideals als relevanter Ansatzpunkt für die Vorbeugung von Verhaltensweisen zum Muskelaufbau. Darüberhinaus konnten bei beiden Geschlechtern sowohl für Gewichts-/Figursorgen, als auch für Muskelsorgen Zusammenhänge mit potentiell gesundheitsschädlichen Verhaltensweisen gezeigt werden. 
Zusammenfassend gelang in der vorliegenden Arbeit eine differenzierte Analyse von Auftreten, Einflussfaktoren und Folgen von Gewichts-/Figursorgen und Muskelsorgen bei Jugendlichen und jungen Erwachsenen. Mittels, großteils prospektiver, latenter Modelle und manifester Pfadanalysen konnten bisherige Befunde überprüft und erste Befunde zu den Forschungslücken in Bezug auf Muskelsorgen bei weiblichen Jugendlichen und jungen Erwachsenen berichtet werden.
KW  - Gewichtssorgen
KW  - Figursorgen
KW  - Muskelsorgen
KW  - Jugendliche
KW  - junge Erwachsene
KW  - weight concern
KW  - shape concern
KW  - muscularity concern
KW  - adolescents
KW  - young adults
Y1  - 2018
ER  - 
TY  - JOUR
A1  - Abramowski, Attila
A1  - Acero, F.
A1  - Aharonian, Felix A.
A1  - Akhperjanian, A. G.
A1  - Anton, Gisela
A1  - Balzer, Arnim
A1  - Barnacka, Anna
A1  - de Almeida, U. Barres
A1  - Becherini, Yvonne
A1  - Becker, J.
A1  - Behera, B.
A1  - Bernlöhr, K.
A1  - Birsin, E.
A1  - Biteau, Jonathan
A1  - Bochow, A.
A1  - Boisson, Catherine
A1  - Bolmont, J.
A1  - Bordas, Pol
A1  - Brucker, J.
A1  - Brun, Francois
A1  - Brun, Pierre
A1  - Bulik, Tomasz
A1  - Buesching, I.
A1  - Carrigan, Svenja
A1  - Casanova, Sabrina
A1  - Cerruti, M.
A1  - Chadwick, Paula M.
A1  - Charbonnier, A.
A1  - Chaves, Ryan C. G.
A1  - Cheesebrough, A.
A1  - Clapson, A. C.
A1  - Coignet, G.
A1  - Cologna, Gabriele
A1  - Conrad, Jan
A1  - Dalton, M.
A1  - Daniel, M. K.
A1  - Davids, I. D.
A1  - Degrange, B.
A1  - Deil, C.
A1  - Dickinson, H. J.
A1  - Djannati-Ataï, A.
A1  - Domainko, W.
A1  - Drury, L. O'C.
A1  - Dubus, G.
A1  - Dutson, K.
A1  - Dyks, J.
A1  - Dyrda, M.
A1  - Egberts, Kathrin
A1  - Eger, P.
A1  - Espigat, P.
A1  - Fallon, L.
A1  - Farnier, C.
A1  - Fegan, S.
A1  - Feinstein, F.
A1  - Fernandes, M. V.
A1  - Fiasson, A.
A1  - Fontaine, G.
A1  - Foerster, A.
A1  - Fuessling, M.
A1  - Gallant, Y. A.
A1  - Gast, H.
A1  - Gerard, L.
A1  - Gerbig, D.
A1  - Giebels, B.
A1  - Glicenstein, J. F.
A1  - Glueck, B.
A1  - Goret, P.
A1  - Goering, D.
A1  - Haeffner, S.
A1  - Hague, J. D.
A1  - Hampf, D.
A1  - Hauser, M.
A1  - Heinz, S.
A1  - Heinzelmann, G.
A1  - Henri, G.
A1  - Hermann, G.
A1  - Hinton, James Anthony
A1  - Hoffmann, A.
A1  - Hofmann, W.
A1  - Hofverberg, P.
A1  - Holler, M.
A1  - Horns, D.
A1  - Jacholkowska, A.
A1  - de Jager, O. C.
A1  - Jahn, C.
A1  - Jamrozy, M.
A1  - Jung, I.
A1  - Kastendieck, M. A.
A1  - Katarzynski, K.
A1  - Katz, U.
A1  - Kaufmann, S.
A1  - Keogh, D.
A1  - Khangulyan, D.
A1  - Khelifi, B.
A1  - Klochkov, D.
A1  - Kluzniak, W.
A1  - Kneiske, T.
A1  - Komin, Nu.
A1  - Kosack, K.
A1  - Kossakowski, R.
A1  - Laffon, H.
A1  - Lamanna, G.
A1  - Lennarz, D.
A1  - Lohse, T.
A1  - Lopatin, A.
A1  - Lu, C. -C.
A1  - Marandon, V.
A1  - Marcowith, Alexandre
A1  - Masbou, J.
A1  - Maurin, D.
A1  - Maxted, N.
A1  - Mayer, M.
A1  - McComb, T. J. L.
A1  - Medina, M. C.
A1  - Mehault, J.
A1  - Moderski, R.
A1  - Moulin, Emmanuel
A1  - Naumann, C. L.
A1  - Naumann-Godo, M.
A1  - de Naurois, M.
A1  - Nedbal, D.
A1  - Nekrassov, D.
A1  - Nguyen, N.
A1  - Nicholas, B.
A1  - Niemiec, J.
A1  - Nolan, S. J.
A1  - Ohm, S.
A1  - Wilhelmi, E. de Ona
A1  - Opitz, B.
A1  - Ostrowski, M.
A1  - Oya, I.
A1  - Panter, M.
A1  - Arribas, M. Paz
A1  - Pedaletti, G.
A1  - Pelletier, G.
A1  - Petrucci, P. -O.
A1  - Pita, S.
A1  - Puehlhofer, G.
A1  - Punch, M.
A1  - Quirrenbach, A.
A1  - Raue, M.
A1  - Rayner, S. M.
A1  - Reimer, A.
A1  - Reimer, O.
A1  - Renaud, M.
A1  - de los Reyes, R.
A1  - Rieger, F.
A1  - Ripken, J.
A1  - Rob, L.
A1  - Rosier-Lees, S.
A1  - Rowell, G.
A1  - Rudak, B.
A1  - Rulten, C. B.
A1  - Ruppel, J.
A1  - Sahakian, V.
A1  - Sanchez, David M.
A1  - Santangelo, Andrea
A1  - Schlickeiser, R.
A1  - Schoeck, F. M.
A1  - Schulz, A.
A1  - Schwanke, U.
A1  - Schwarzburg, S.
A1  - Schwemmer, S.
A1  - Sheidaei, F.
A1  - Skilton, J. L.
A1  - Sol, H.
A1  - Spengler, G.
A1  - Stawarz, L.
A1  - Steenkamp, R.
A1  - Stegmann, Christian
A1  - Stinzing, F.
A1  - Stycz, K.
A1  - Sushch, Iurii
A1  - Szostek, A.
A1  - Tavernet, J. -P.
A1  - Terrier, R.
A1  - Tluczykont, M.
A1  - Valerius, K.
A1  - van Eldik, C.
A1  - Vasileiadis, G.
A1  - Venter, C.
A1  - Vialle, J. P.
A1  - Viana, A.
A1  - Vincent, P.
A1  - Voelk, H. J.
A1  - Volpe, F.
A1  - Vorobiov, S.
A1  - Vorster, M.
A1  - Wagner, S. J.
A1  - Ward, M.
A1  - White, R.
A1  - Wierzcholska, A.
A1  - Zacharias, M.
A1  - Zajczyk, A.
A1  - Zdziarski, A. A.
A1  - Zech, Alraune
A1  - Zechlin, H. -S.
A1  - Aleksic, J.
A1  - Antonelli, L. A.
A1  - Antoranz, P.
A1  - Backes, Michael
A1  - Barrio, J. A.
A1  - Bastieri, D.
A1  - Becerra Gonzalez, J.
A1  - Bednarek, W.
A1  - Berdyugin, A.
A1  - Berger, K.
A1  - Bernardini, E.
A1  - Biland, A.
A1  - Blanch Bigas, O.
A1  - Bock, R. K.
A1  - Boller, A.
A1  - Bonnoli, G.
A1  - Tridon, D. Borla
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T1  - The 2010 very high energy gamma-ray flare and 10 years ofmulti-wavelength oservations of M 87
JF  - The astrophysical journal : an international review of spectroscopy and astronomical physics
N2  - The giant radio galaxy M 87 with its proximity (16 Mpc), famous jet, and very massive black hole ((3-6) x 10(9) M-circle dot) provides a unique opportunity to investigate the origin of very high energy (VHE; E > 100 GeV) gamma-ray emission generated in relativistic outflows and the surroundings of supermassive black holes. M 87 has been established as a VHE gamma-ray emitter since 2006. The VHE gamma-ray emission displays strong variability on timescales as short as a day. In this paper, results from a joint VHE monitoring campaign on M 87 by the MAGIC and VERITAS instruments in 2010 are reported. During the campaign, a flare at VHE was detected triggering further observations at VHE (H.E.S.S.), X-rays (Chandra), and radio (43 GHz Very Long Baseline Array, VLBA). The excellent sampling of the VHE gamma-ray light curve enables one to derive a precise temporal characterization of the flare: the single, isolated flare is well described by a two-sided exponential function with significantly different flux rise and decay times of tau(rise)(d) = (1.69 +/- 0.30) days and tau(decay)(d) = (0.611 +/- 0.080) days, respectively. While the overall variability pattern of the 2010 flare appears somewhat different from that of previous VHE flares in 2005 and 2008, they share very similar timescales (similar to day), peak fluxes (Phi(>0.35 TeV) similar or equal to (1-3) x 10(-11) photons cm(-2) s(-1)), and VHE spectra. VLBA radio observations of 43 GHz of the inner jet regions indicate no enhanced flux in 2010 in contrast to observations in 2008, where an increase of the radio flux of the innermost core regions coincided with a VHE flare. On the other hand, Chandra X-ray observations taken similar to 3 days after the peak of the VHE gamma-ray emission reveal an enhanced flux from the core (flux increased by factor similar to 2; variability timescale <2 days). The long-term (2001-2010) multi-wavelength (MWL) light curve of M 87, spanning from radio to VHE and including data from Hubble Space Telescope, Liverpool Telescope, Very Large Array, and European VLBI Network, is used to further investigate the origin of the VHE gamma-ray emission. No unique, common MWL signature of the three VHE flares has been identified. In the outer kiloparsec jet region, in particular in HST-1, no enhanced MWL activity was detected in 2008 and 2010, disfavoring it as the origin of the VHE flares during these years. Shortly after two of the three flares (2008 and 2010), the X-ray core was observed to be at a higher flux level than its characteristic range (determined from more than 60 monitoring observations: 2002-2009). In 2005, the strong flux dominance of HST-1 could have suppressed the detection of such a feature. Published models for VHE gamma-ray emission from M 87 are reviewed in the light of the new data.
KW  - galaxies: active
KW  - galaxies: individual (M 87)
KW  - galaxies: jets
KW  - galaxies: nuclei
KW  - gamma rays: galaxies
KW  - radiation mechanisms: non-thermal
Y1  - 2012
U6  - https://doi.org/10.1088/0004-637X/746/2/151
SN  - 0004-637X
VL  - 746
IS  - 2
PB  - IOP Publ. Ltd.
CY  - Bristol
ER  -