SIMBAD references

2014MNRAS.438.3521D - Mon. Not. R. Astron. Soc., 438, 3521-3534 (2014/March-2)

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

D'AMMANDO F., LARSSON J., ORIENTI M., RAITERI C.M., ANGELAKIS E., CARRAMINANA A., CARRASCO L., DRAKE A.J., FUHRMANN L., GIROLETTI M., HOVATTA T., MAX-MOERBECK W., PORRAS A., READHEAD A.C.S., RECILLAS E. and RICHARDS J.L.

Abstract (from CDS):

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. This different 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 ∼ 2keV, 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.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): galaxies: active - galaxies: individual: (PMN J0948+0022) - galaxies: nuclei - galaxies: Seyfert - gamma-rays: galaxies - gamma-rays: general

Simbad objects: 14

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2019.12.16-03:43:30

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