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

被引：26

作者：

D'Ammando, F. ^{[1
,2
]}

Larsson, J. ^{[3
,4
]}

Orienti, M. ^{[1
,5
]}

Raiteri, C. M. ^{[6
]}

Angelakis, E. ^{[7
]}

Carraminana, A. ^{[8
]}

Carrasco, L. ^{[8
]}

Drake, A. J. ^{[9
]}

Fuhrmann, L. ^{[7
]}

Giroletti, M. ^{[1
]}

Hovatta, T. ^{[10
]}

Max-Moerbeck, W. ^{[10
]}

Porras, A. ^{[8
]}

Readhead, A. C. S. ^{[10
]}

Recillas, E. ^{[8
]}

Richards, J. L. ^{[11
]}

机构：

[1] INAF Ist Radioastron, Via Gobetti 101, I-40129 Bologna, Italy

[2] Univ Perugia, Dipartimento Fis, I-06123 Perugia, Italy

[3] KTH, Dept Phys, SE-10691 Stockholm, Sweden

[4] Oskar Klein Ctr, SE-10691 Stockholm, Sweden

[5] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy

[6] INAF Osservatorio Astrofis Torino, I-10025 Pino Torinese, TO, Italy

[7] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[8] Inst Natl Astrofis Opt & Elect, Puebla 72840, Mexico

[9] CALTECH, Pasadena, CA 91225 USA

[10] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 USA

[11] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2014年 / 438卷 / 04期

基金：

芬兰科学院; 美国国家航空航天局;

关键词：

galaxies: active; galaxies: individual: (PMN J0948+0022); galaxies: nuclei; galaxies: Seyfert; gamma-rays: galaxies; gamma-rays: general; ACTIVE GALACTIC NUCLEI; LARGE-AREA TELESCOPE; INTRANIGHT OPTICAL VARIABILITY; SPECTRAL ENERGY-DISTRIBUTION; X-RAY; RADIO-LOUD; XMM-NEWTON; SDSS J094857.3+002225; RELATIVISTIC JETS; MAGNETIC-FLUX;

D O I：

10.1093/mnras/stt2464

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on radio-to-gamma-ray observations during 2011 May-September of PMN J0948+0022, the first narrow-line Seyfert 1 (NLSy1) galaxy detected in gamma-rays by Fermi-Large Area Telescope. Strong variability was observed in gamma-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 gamma-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 similar to 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.

引用

页码：3521 / 3534

页数：14

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