Refine
Has Fulltext
- no (24)
Document Type
- Article (24)
Language
- English (24)
Is part of the Bibliography
- yes (24)
Keywords
- gamma rays: galaxies (7)
- gamma rays: general (6)
- BL Lacertae objects: general (5)
- astroparticle physics (4)
- galaxies: active (4)
- gamma-rays: general (3)
- radiation mechanisms: non-thermal (3)
- BL Lacertae objects: individual: Mrk 421 (2)
- BL Lacertae objects: individual: Mrk 501 (2)
- Galaxy: center (2)
- binaries: general (2)
- galaxies: nuclei (2)
- pulsars: general (2)
- BL Lacertae objects: individual (1ES 0229+200, VER J0232+202) (1)
- BL Lacertae objects: individual (1ES 1959+650) (1)
- BL Lacertae objects: individual (B2 1215+30, VER J1217+301) (1)
- BL Lacertae objects: individual (PKS 1424+240)-cosmic background radiation (1)
- BL Lacertae objects: individual: 1ES 2344+514=VERJ2347+517 (1)
- ISM: individual objects (Crab Nebula) (1)
- ISM: supernova remnants (1)
- X-rays: binaries (1)
- X-rays: galaxies (1)
- astrobiology (1)
- black hole physics (1)
- diffuse radiation (1)
- extraterrestrial intelligence (1)
- galaxies: Seyfert (1)
- galaxies: active-galaxies: individual: PMN J0948+0022 (1)
- galaxies: individual (Markarian 501) (1)
- galaxies: individual: 1ES 1741+196=VER J1744+195 (1)
- galaxies: jets (1)
- gamma rays: stars (1)
- gamma-ray burst: individual (GRB 130427A) (1)
- gamma-ray burst: individual (MGRO J1908+06, VER J1907+062) (1)
- gamma-rays: galaxies (1)
- magnetic fields (1)
- methods: data analysis (1)
- methods: observational (1)
- pulsars: individual (PSR J0633+1746, Geminga) (1)
- pulsars: individual (PSR J1023+0038) (1)
- pulsars: individual (PSR J1907+0602) (1)
- relativistic processes (1)
- stars: individual ( KIC 8462852) (1)
- stars: individual (LS I+61 degrees 303, VER J0240+612) (1)
- supernovae: individual (G0.9+0.1) (1)
- techniques: photometric (1)
Institute
We report on multifrequency observations performed during 2012 December-2013 August of the first narrow-line Seyfert 1 galaxy detected in gamma-rays, PMN J0948+0022 (z = 0.5846). A y -ray flare was observed by the Large Area Telescope on board Fermi during 2012 December-2013 January, reaching a daily peak flux in the 0.1-100 GeV energy range of (155 31) x 10 8 ph cm(-2) S-1 on 2013 January 1, corresponding to an apparent isotropic luminosity of similar to 1.5 x 1048 erg s(-1). The y -ray flaring period triggered Swift and Very Energetic Radiation Imaging Telescope Array System (VERITAS) observations in addition to radio and optical monitoring by Owens Valley Radio Observatory, Monitoring Of Jets in Active galactic nuclei with VLBA Experiments, and Catalina Real-time Transient Survey. A strong flare was observed in optical, UV, and X-rays on 2012 December 30, quasi-simultaneously to the y -ray flare, reaching a record flux for this source from optical to y gamma-rays. VERITAS observations at very high energy (E > 100 GeV) during 2013 January 6-17 resulted in an upper limit of F>0.2 Trev < 4.0 x 10(-12) ph cm(-2) s(-1). We compared the spectral energy distribution (SED) of the flaring state in 2013 January with that of an intermediate state observed in 2011. The two SEDs, modelled as synchrotron emission and an external Compton scattering of seed photons from a dust torus, can be modelled by changing both the electron distribution parameters and the magnetic field.