The most powerful flaring activity from the NLSy1 PMN J0948+0022
Abstract
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 ( = 0.5846). A gamma-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) 10 ph cm s on 2013 January 1, corresponding to an apparent isotropic luminosity of about 1.510 erg s. The gamma-ray flaring period triggered Swift and VERITAS observations in addition to radio and optical monitoring by OVRO, MOJAVE, and CRTS. A strong flare was observed in optical, UV, and X-rays on 2012 December 30, quasi-simultaneously to the gamma-ray flare, reaching a record flux for this source from optical to 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 TeV) < 4.010 ph cm s. 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.
Keywords
Cite
@article{arxiv.1410.7144,
title = {The most powerful flaring activity from the NLSy1 PMN J0948+0022},
author = {F. D'Ammando and M. Orienti and J. Finke and C. M. Raiteri and T. Hovatta and J. Larsson and W. Max-Moerbeck and J. Perkins and A. C. S. Readhead and J. L. Richards and M. Beilicke and W. Benbow and K. Berger and R. Bird and V. Bugaev and J. V. Cardenzana and M. Cerruti and X. Chen and L. Ciupik and H. J. Dickinson and J. D. Eisch and M. Errando and A. Falcone and J. P. Finley and H. Fleischhack and P. Fortin and L. Fortson and A. Furniss and L. Gerard and G. H. Gillanders and S. T. Griffiths and J. Grube and G. Gyuk and N. Hakansson and J. Holder and T. B. Humensky and P. Kar and M. Kertzman and Y. Khassen and D. Kieda and F. Krennrich and S. Kumar and M. J. Lang and G. Maier and A. McCann and K. Meagher and P. Moriarty and R. Mukherjee and D. Nieto and A. O' Faolain de Bhroithe and R. A. Ong and A. N. Otte and M. Pohl and A. Popkow and H. Prokoph and E. Pueschel and J. Quinn and K. Ragan and P. T. Reynolds and G. T. Richards and E. Roache and J. Rousselle and M. Santander and G. H. Sembroski and A. W. Smith and D. Staszak and I. Telezhinsky and J. V. Tucci and J. Tyler and A. Varlotta and V. V. Vassiliev and S. P. Wakely and A. Weinstein and R. Welsing and D. A. Williams and B. Zitzer},
journal= {arXiv preprint arXiv:1410.7144},
year = {2015}
}
Comments
13 pages, 5 Figures, 5 Tables. Accepted for publication in Monthly Notices of the Royal Astronomical Society