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Title: Multiwavelength observations of the γ-ray-emitting narrow-line Seyfert 1 PMN J0948+0022 in 2011

Journal Article · · Monthly Notices of the Royal Astronomical Society
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7];  [5];  [8];  [9];  [9];  [6];  [9];  [6];  [10]
  1. National Inst. for Astrophysics (INAF), Bologna (Italy). Inst. of Radioastronomy; Univ. of Perugia (Italy). Dept. of Physics
  2. KTH Royal Inst. of Technology and Oskar Kein Centre, Stockholm (Sweden)
  3. National Inst. for Astrophysics (INAF), Bologna (Italy). Inst. of Radioastronomy; Univ. of Bologna (Italy). Dept. of Astronomy
  4. National Inst. for Astrophysics (INAF), Pino Torinese (Italy). Astrophysical Observatory of Torino
  5. Max Planck Inst. for Radio Astronomy, Bonn (Germany)
  6. National Inst. of Astrophysics, Optics, and Electronics, Puebla (Mexico)
  7. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  8. National Inst. for Astrophysics (INAF), Bologna (Italy). Inst. of Radioastronomy
  9. California Inst. of Technology (CalTech), Pasadena, CA (United States). Cahill Center for Astronomy and Astrophysics
  10. Purdue Univ., West Lafayette, IN (United States). Dept. of Physics
+ Show Author Affiliations

Here, we report on radio-to-γ-ray observations during 2011 May–September of PMN J0948+0022, the first narrow-line Seyfert 1 (NLSy1) galaxy detected in γ-rays by Fermi-Large Area Telescope. Strong variability was observed in γ-rays, with two flaring periods peaking on 2011 June 20 and July 28. The variability observed in optical and near-infrared seems to have no counterpart in γ-rays. The difference in behaviour could be related to a bending and inhomogeneous jet or a turbulent extreme multicell scenario. The radio spectra showed a variability pattern typical of relativistic jets. The XMM spectrum shows that the emission from the jet dominates above ~2 keV, while a soft X-ray excess is evident in the low-energy part of the X-ray spectrum. Models where the soft emission is partly produced by blurred reflection or Comptonization of the thermal disc emission provide good fits to the data. The X-ray spectral slope is similar to that found in radio-quiet NLSy1, suggesting that a standard accretion disc is present, as expected from the high accretion rate. Except for the soft X-ray excess, unusual in jet-dominated active galactic nuclei, PMN J0948+0022, shows all characteristics of the blazar class.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
Fermi LAT Collaboration
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1356533
Journal Information:
Monthly Notices of the Royal Astronomical Society, Vol. 438, Issue 4; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Cited By (13)

What powers the radio-loud narrow-line Seyfert 1 galaxy RX J2314.9+2243?: A view onto its central engine from radio to X-rays⋆ journal February 2015
Properties of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies journal February 2015
The gamma-ray emitting radio-loud narrow-line Seyfert 1 galaxy PKS 2004−447: II. The radio view⋆ journal April 2016
A flat-spectrum flare in S4 0444+63 revealed by a new implementation of multiwavelength single-dish observations journal January 2020
The most powerful flaring activity from the NLSy1 PMN J0948+0022 journal November 2014
FBQS J1644+2619: multiwavelength properties and its place in the class of γ-ray emitting Narrow Line Seyfert 1s journal January 2018
SDSS J211852.96−073227.5: a new γ-ray flaring narrow-line Seyfert 1 galaxy journal April 2018
Relativistic Jets in Gamma-Ray-Emitting Narrow-Line Seyfert 1 Galaxies journal November 2019
Strong Soft X-Ray Excess in 2015 XMM-Newton Observations of BL Lac OJ 287 journal February 2020
The most powerful flaring activity from the NLSy1 PMN J0948+0022 text January 2015
The Gamma-Ray Emitting Radio-Loud Narrow-Line Seyfert 1 Galaxy PKS 2004-447 II. The Radio View text January 2015
FBQS J1644+2619: multiwavelength properties and its place in the class of gamma-ray emitting Narrow Line Seyfert 1s text January 2018
Strong Soft X-ray Excess in 2015 XMM-Newton Observation of BL--Lac OJ~287 text January 2019

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
galaxies: active
galaxies: individual: (PMN J0948+0022)
galaxies: nuclei
galaxies: Seyfert
gamma-rays: galaxies
gamma-rays: general