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VHE gamma-ray discovery and multiwavelength study of the blazar 1ES 2322-409

Hassan E. Abdalla, Felix A. Aharonian, F. Ait Benkhali, Ekrem Oǧuzhan Angüner, M. Arakawa, C. Arcaro, C. Armand, M. Arrieta, M. Backes, M. Barnard, Y. Becherini, J. Becker Tjus, D. Berge, S. Bernhard, K. Bernloehr, R. Blackwell, M. Bottcher, C. Boisson, J. Bolmont, S. Bonnefoy, Pol Bordas, J. Bregeon, F. Brun, P. Brun, M. Bryan, M. Buechele, T. Bulik, T. Bylund, M. Capasso, S. Caroff, A. Carosi, Sabrina Casanova, M. Cerruti, N. Chakraborty, S. Chandra, R. C. G. Chaves, A. Chen, S. Colafrancesco, B. Condon, I. D. Davids, C. Dei, J. Devin, P. deWilt, L. Dirson, A. Djannati-Atai, A. Dmytriiev, A. Donath, J. Dyks, Kathrin Egberts, G. Emery, J. -P. Ernenwein, S. Eschbach, S. Fegan, A. Fiasson, G. Fontaine, S. Funk, Matthias Füssling, S. Gabici, Y. A. Gallant, T. Garrigoux, F. Gate, G. Giavitto, D. Glawion, J. F. Glicenstein, D. Gottschall, M. -H. Grondin, J. Hahn, M. Haupt, G. Heinzelmann, G. Henri, G. Hermann, J. A. Hinton, W. Hofmann, Clemens Hoischen, T. L. Holch, M. Holler, D. Horns, D. Huber, H. Iwasaki, A. Jacholkowska, M. Jamrozy, D. Jankowsky, F. Jankowsky, L. Jouvin, I. Jung-Richardt, M. A. Kastendieck, K. Katarzynski, M. Katsuragawa, U. Katz, D. Kerszberg, D. Khangulyan, B. Khelifi, J. King, S. Klepser, W. Kluzniak, Nu. Komin, K. Kosack, S. Krakau, M. Kraus, R. R. Kruger, G. Lamanna, J. Lau, J. Lefaucheur, A. Lemiere, M. Lemoine-Goumard, J. -P. Lenain, Eva Leser, T. Lohse, M. Lorentz, R. Lopez-Coto, I. Lypova, D. Malyshev, V. Marandon, A. Marcowith, C. Mariaud, G. Marti-Devesa, R. Marx, G. Maurin, P. J. Meintjes, A. M. W. Mitche, R. Moderski, M. Mohamed, L. Mohrmann, E. Moulin, T. Murach, S. Nakashima, M. de Naurois, H. Ndiyavala, F. Niederwanger, J. Niemiec, L. Oakes, H. Odaka, S. Ohm, M. Ostrowski, I. Oya, M. Padovani, M. Panter, R. D. Parsons, C. Perennes, P. -O. Petrucci, B. Peyaud, Q. Piel, S. Pita, V. Poireau, A. Priyana Noel, D. A. Prokhorov, H. Prokoph, G. Puehlhofer, M. Punch, A. Quirrenbach, S. Raab, R. Rauth, A. Reimer, O. Reimer, M. Renaud, F. Rieger, L. Rinchiuso, C. Romoli, G. Rowell, B. Rudak, E. Ruiz-Velasco, V. Sahakian, S. Saito, David M. Sanchez, A. Santangelo, M. Sasaki, R. Schlickeiser, F. Schussler, A. Schulz, U. Schwanke, S. Schwemmer, M. Seglar-Arroyo, M. Senniappan, A. S. Seyffert, N. Shafi, I. Shilon, K. Shiningayamwe, R. Simoni, A. Sinha, H. Sol, F. Spanier, A. Specovius, M. Spir-Jacob, L. Stawarz, R. Steenkamp, Christian Stegmann, Constantin Beverly Steppa, Iurii Sushch, T. Takahashi, J. -P. Tavernet, T. Tavernier, A. M. Taylor, R. Terrier, L. Tibaldo, D. Tiziani, M. Tluczykont, C. Trichard, M. Tsirou, N. Tsuji, R. Tuffs, Y. Uchiyama, D. J. van der Walt, C. van Eldik, C. van Rensburg, B. van Soelen, G. Vasileiadis, J. Veh, C. Venter, A. Viana, P. Vincent, J. Vink, F. Voisin, H. J. Voelk, T. Vuillaume, Z. Wadiasingh, S. J. Wagner, P. Wagner, R. M. Wagner, R. White, A. Wierzcholska, A. Woernlein, R. Yang, D. Zaborov, M. Zacharias, R. Zanin, A. A. Zdziarski, Alraune Zech, F. Zefi, A. Ziegler, J. Zorn, N. Zywucka

  • A hotspot at a position compatible with the BL. Lac object 1ES 2322-409 was serendipitously detected with H.E.S.S. during observations performed in 2004 and 2006 on the blazar PKS 2316-423. Additional data on 1ES 2322-409 were taken in 2011 and 2012, leading to a total live-time of 22.3 h. Point-like very-high-energy (VHE; E > 100 GeV) gamma-ray emission is detected from a source centred on the IFS 2322-409 position, with an excess of 116.7 events at a significance of 6.0 sigma. The average VHE gamma-ray spectrum is well described with a power law with a photon index Gamma = 3.40 +/- 0.66(stat) +/- 0.20(sys) and an integral flux Phi(E > 200 GeV) = (3.11 +/- 0.71(stat) 0.62(sys)) x 10(-2)cm(-2)s(-1), which corresponds to 1.1 per cent of the Crab nebula flux above 200 GeV. Multiwavelength data obtained with Fermi LAT, Swift XRT and UVOT, RXTE PCA, ATOM, and additional data from WISE, GROND, and Catalina are also used to characterize the broad-band non-thermal emission of lES 2322-409. The multiwavelength behaviour indicates day-scaleA hotspot at a position compatible with the BL. Lac object 1ES 2322-409 was serendipitously detected with H.E.S.S. during observations performed in 2004 and 2006 on the blazar PKS 2316-423. Additional data on 1ES 2322-409 were taken in 2011 and 2012, leading to a total live-time of 22.3 h. Point-like very-high-energy (VHE; E > 100 GeV) gamma-ray emission is detected from a source centred on the IFS 2322-409 position, with an excess of 116.7 events at a significance of 6.0 sigma. The average VHE gamma-ray spectrum is well described with a power law with a photon index Gamma = 3.40 +/- 0.66(stat) +/- 0.20(sys) and an integral flux Phi(E > 200 GeV) = (3.11 +/- 0.71(stat) 0.62(sys)) x 10(-2)cm(-2)s(-1), which corresponds to 1.1 per cent of the Crab nebula flux above 200 GeV. Multiwavelength data obtained with Fermi LAT, Swift XRT and UVOT, RXTE PCA, ATOM, and additional data from WISE, GROND, and Catalina are also used to characterize the broad-band non-thermal emission of lES 2322-409. The multiwavelength behaviour indicates day-scale variability. Swift UVOT and XRT data show strong variability at longer scales. A spectral energy distribution (SED) is built from contemporaneous observations obtained around a high state identified in Swift data. A modelling of the SED is performed with a stationary homogeneous one-zone synchrotronself-Compton leptonic model. The redshift of the source being unknown, two plausible values were tested for the modelling. A systematic scan of the model parameters space is performed, resulting in a well-constrained combination of values providing a good description of the broad-band behaviour of 1ES 2322-409.show moreshow less

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Author details:Hassan E. AbdallaORCiDGND, Felix A. AharonianORCiDGND, F. Ait Benkhali, Ekrem Oǧuzhan AngünerGND, M. Arakawa, C. Arcaro, C. Armand, M. Arrieta, M. Backes, M. Barnard, Y. Becherini, J. Becker Tjus, D. Berge, S. Bernhard, K. Bernloehr, R. Blackwell, M. Bottcher, C. Boisson, J. Bolmont, S. Bonnefoy, Pol BordasORCiDGND, J. Bregeon, F. Brun, P. Brun, M. Bryan, M. Buechele, T. Bulik, T. Bylund, M. Capasso, S. Caroff, A. Carosi, Sabrina CasanovaGND, M. Cerruti, N. Chakraborty, S. Chandra, R. C. G. Chaves, A. Chen, S. Colafrancesco, B. Condon, I. D. Davids, C. Dei, J. Devin, P. deWilt, L. Dirson, A. Djannati-Atai, A. Dmytriiev, A. Donath, J. Dyks, Kathrin EgbertsGND, G. Emery, J. -P. Ernenwein, S. Eschbach, S. Fegan, A. Fiasson, G. Fontaine, S. Funk, Matthias Füssling, S. Gabici, Y. A. Gallant, T. Garrigoux, F. Gate, G. Giavitto, D. Glawion, J. F. Glicenstein, D. Gottschall, M. -H. Grondin, J. Hahn, M. Haupt, G. Heinzelmann, G. Henri, G. Hermann, J. A. Hinton, W. Hofmann, Clemens HoischenORCiDGND, T. L. Holch, M. Holler, D. Horns, D. Huber, H. Iwasaki, A. Jacholkowska, M. Jamrozy, D. Jankowsky, F. Jankowsky, L. Jouvin, I. Jung-Richardt, M. A. Kastendieck, K. Katarzynski, M. Katsuragawa, U. Katz, D. Kerszberg, D. Khangulyan, B. Khelifi, J. King, S. Klepser, W. Kluzniak, Nu. Komin, K. Kosack, S. Krakau, M. Kraus, R. R. Kruger, G. Lamanna, J. Lau, J. Lefaucheur, A. Lemiere, M. Lemoine-Goumard, J. -P. Lenain, Eva LeserORCiDGND, T. Lohse, M. Lorentz, R. Lopez-Coto, I. Lypova, D. Malyshev, V. Marandon, A. Marcowith, C. Mariaud, G. Marti-Devesa, R. Marx, G. Maurin, P. J. Meintjes, A. M. W. Mitche, R. Moderski, M. Mohamed, L. Mohrmann, E. Moulin, T. Murach, S. Nakashima, M. de Naurois, H. Ndiyavala, F. Niederwanger, J. Niemiec, L. Oakes, H. Odaka, S. Ohm, M. Ostrowski, I. Oya, M. Padovani, M. Panter, R. D. Parsons, C. Perennes, P. -O. Petrucci, B. Peyaud, Q. Piel, S. Pita, V. Poireau, A. Priyana Noel, D. A. Prokhorov, H. Prokoph, G. Puehlhofer, M. Punch, A. Quirrenbach, S. Raab, R. Rauth, A. Reimer, O. Reimer, M. Renaud, F. Rieger, L. Rinchiuso, C. Romoli, G. Rowell, B. Rudak, E. Ruiz-Velasco, V. Sahakian, S. Saito, David M. SanchezORCiD, A. Santangelo, M. Sasaki, R. Schlickeiser, F. Schussler, A. Schulz, U. Schwanke, S. Schwemmer, M. Seglar-Arroyo, M. Senniappan, A. S. Seyffert, N. Shafi, I. Shilon, K. Shiningayamwe, R. Simoni, A. Sinha, H. Sol, F. Spanier, A. Specovius, M. Spir-Jacob, L. Stawarz, R. Steenkamp, Christian StegmannORCiDGND, Constantin Beverly SteppaORCiD, Iurii SushchORCiDGND, T. Takahashi, J. -P. Tavernet, T. Tavernier, A. M. Taylor, R. Terrier, L. Tibaldo, D. Tiziani, M. Tluczykont, C. Trichard, M. Tsirou, N. Tsuji, R. Tuffs, Y. Uchiyama, D. J. van der Walt, C. van Eldik, C. van Rensburg, B. van Soelen, G. Vasileiadis, J. Veh, C. Venter, A. Viana, P. Vincent, J. Vink, F. Voisin, H. J. Voelk, T. Vuillaume, Z. Wadiasingh, S. J. Wagner, P. Wagner, R. M. Wagner, R. White, A. Wierzcholska, A. Woernlein, R. Yang, D. Zaborov, M. Zacharias, R. Zanin, A. A. Zdziarski, Alraune ZechORCiD, F. Zefi, A. Ziegler, J. Zorn, N. Zywucka
DOI:https://doi.org/10.1093/mnras/sty2686
ISSN:0035-8711
ISSN:1365-2966
Title of parent work (English):Monthly notices of the Royal Astronomical Society
Publisher:Oxford Univ. Press
Place of publishing:Oxford
Publication type:Article
Language:English
Date of first publication:2018/10/05
Publication year:2018
Creating corporation:HESS Collaboration
Release date:2021/05/19
Tag:BL Lacertae objects: individual: 1ES 2322-409; galaxies: active; gamma-rays: galaxies; radiation mechanisms: non-thermal
Volume:482
Issue:3
Number of pages:12
First page:3011
Last Page:3022
Funding institution:German Ministry for Education and Research (BMBF)Federal Ministry of Education & Research (BMBF); Max Planck SocietyMax Planck SocietyFoundation CELLEX; German Research Foundation (DFG)German Research Foundation (DFG); Alexander von Humboldt FoundationAlexander von Humboldt Foundation; Deutsche ForschungsgemeinschaftGerman Research Foundation (DFG); French Ministry for ResearchMinistry of Research, France; CNRS-IN2P3Centre National de la Recherche Scientifique (CNRS); Astroparticle Interdisciplinary Programme of the CNRS; U.K. Science and Technology Facilities Council (STFC)Science & Technology Facilities Council (STFC); IPNP of the Charles University; Czech Science FoundationGrant Agency of the Czech Republic; Polish National Science Centre; South African Department of Science and Technology; National Research Foundation; University of Namibia; National Commission on Research, Science AMP; Technology of Namibia (NCRST); Innsbruck University; Austrian Science Fund (FWF)Austrian Science Fund (FWF); Austrian Federal Ministry for Science, Research and Economy; University of Adelaide; Australian Research CouncilAustralian Research Council; Japan Society for the Promotion of ScienceMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT)Japan Society for the Promotion of Science; University of Amsterdam; National Aeronautics and Space AdministrationNational Aeronautics & Space Administration (NASA); National Science FoundationNational Science Foundation (NSF); National Aeronautics and Space AdministrationNational Aeronautics & Space Administration (NASA) [NNG05GF22G]; U.S. National Science FoundationNational Science Foundation (NSF) [AST-0909182, AST-1313422]; Paris Science et Lettres (PSL) foundation; EU FP7 Marie CurieEuropean Union (EU) [PIEF-GA-2012-332350]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
DDC classification:5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften
Peer review:Referiert
Publishing method:Open Access / Bronze Open-Access
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