Multiwavelength observations of the γ-ray-emitting narrow-line Seyfert 1 PMN J0948+0022 in 2011
Abstract
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.
- Authors:
-
- National Inst. for Astrophysics (INAF), Bologna (Italy). Inst. of Radioastronomy; Univ. of Perugia (Italy). Dept. of Physics
- KTH Royal Inst. of Technology and Oskar Kein Centre, Stockholm (Sweden)
- National Inst. for Astrophysics (INAF), Bologna (Italy). Inst. of Radioastronomy; Univ. of Bologna (Italy). Dept. of Astronomy
- National Inst. for Astrophysics (INAF), Pino Torinese (Italy). Astrophysical Observatory of Torino
- Max Planck Inst. for Radio Astronomy, Bonn (Germany)
- National Inst. of Astrophysics, Optics, and Electronics, Puebla (Mexico)
- California Inst. of Technology (CalTech), Pasadena, CA (United States)
- National Inst. for Astrophysics (INAF), Bologna (Italy). Inst. of Radioastronomy
- California Inst. of Technology (CalTech), Pasadena, CA (United States). Cahill Center for Astronomy and Astrophysics
- Purdue Univ., West Lafayette, IN (United States). Dept. of Physics
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- Fermi LAT Collaboration
- OSTI Identifier:
- 1356533
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Volume: 438; Journal Issue: 4; Journal ID: ISSN 0035-8711
- Publisher:
- Royal Astronomical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; galaxies: active; galaxies: individual: (PMN J0948+0022); galaxies: nuclei; galaxies: Seyfert; gamma-rays: galaxies; gamma-rays: general
Citation Formats
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. Multiwavelength observations of the γ-ray-emitting narrow-line Seyfert 1 PMN J0948+0022 in 2011. United States: N. p., 2014.
Web. doi:10.1093/mnras/stt2464.
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., & Richards, J. L. Multiwavelength observations of the γ-ray-emitting narrow-line Seyfert 1 PMN J0948+0022 in 2011. United States. https://doi.org/10.1093/mnras/stt2464
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. Tue .
"Multiwavelength observations of the γ-ray-emitting narrow-line Seyfert 1 PMN J0948+0022 in 2011". United States. https://doi.org/10.1093/mnras/stt2464. https://www.osti.gov/servlets/purl/1356533.
@article{osti_1356533,
title = {Multiwavelength observations of the γ-ray-emitting narrow-line Seyfert 1 PMN J0948+0022 in 2011},
author = {D'Ammando, F. and Larsson, J. and Orienti, M. and Raiteri, C. M. and Angelakis, E. and Carraminana, A. and Carrasco, L. and Drake, A. J. and Fuhrmann, L. and Giroletti, M. and Hovatta, T. and Max-Moerbeck, W. and Porras, A. and Readhead, A. C. S. and Recillas, E. and Richards, J. L.},
abstractNote = {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.},
doi = {10.1093/mnras/stt2464},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 4,
volume = 438,
place = {United States},
year = {Tue Jan 28 00:00:00 EST 2014},
month = {Tue Jan 28 00:00:00 EST 2014}
}
Web of Science
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