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Title: The ordinary life of the γ-ray emitting narrow-line Seyfert 1 galaxy PKS 1502+036

Abstract

In this paper, we report on multifrequency observations of the γ-ray emitting narrow-line Seyfert 1 galaxy PKS 1502+036 performed from radio to γ-rays during 2008 August–2012 November by Fermi-Large Area Telescope (LAT), Swift (X-ray Telescope and Ultraviolet/Optical Telescope), Owens Valley Radio Observatory, Very Long Baseline Array (VLBA) and Very Large Array. No significant variability has been observed in γ-rays, with 0.1–100 GeV flux that ranged between (3–7) × 10 –8 ph cm –2 s –1 using 3-month time bins. The photon index of the LAT spectrum (Γ = 2.60 ± 0.06) and the apparent isotropic γ-ray luminosity (L0.1-100 GeV = 7.8 × 10 45 erg s –1) over 51 months are typical of a flat spectrum radio quasar. The radio spectral variability and the one-sided structure, in addition to the observed γ-ray luminosity, suggest a relativistic jet with a high Doppler factor. In contrast to SBS 0846+513, the VLBA at 15 GHz did not observe superluminal motion for PKS 1502+036. Despite having the optical characteristics typical of a narrow-line Seyfert 1 galaxy, radio and γ-ray properties of PKS 1502+036 are found to be similar to those of a blazar at the low end of the black hole mass distribution formore » blazars. As a result, this is in agreement with what has been found in the case of the other γ-ray emitting narrow-line Seyfert 1 SBS 0846+513.« less

Authors:
 [1];  [2];  [3];  [4];  [2];  [5];  [5];  [5];  [5];  [6]
  1. Univ. degli Studi di Perugia, Perugia (Italy); INFN Sezione di Perugia, Perugia (Italy); INAF - Istituto di Radioastronomia, Bologna (Italy)
  2. INAF - Istituto di Radioastronomia, Bologna (Italy); Univ. di Bologna, Bologna (Italy)
  3. Japan Aerospace Exploration Agency, Kanagawa (Japan); The Graduate Univ. for Advanced Studies, Kanagawa (Japan)
  4. INAF - Istituto di Radioastronomia, Bologna (Italy)
  5. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  6. Purdue Univ., West Lafayette, IN (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1356571
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 433; Journal Issue: 2; 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: PKS 1502+036; galaxies: nuclei; galaxies: Seyfert; gamma-rays: general

Citation Formats

D'Ammando, F., Orienti, M., Doi, A., Giroletti, M., Dallacasa, D., Hovatta, T., Drake, A. J., Max-Moerbeck, W., Readhead, A. C. S., and Richards, J. L. The ordinary life of the γ-ray emitting narrow-line Seyfert 1 galaxy PKS 1502+036. United States: N. p., 2013. Web. doi:10.1093/mnras/stt778.
D'Ammando, F., Orienti, M., Doi, A., Giroletti, M., Dallacasa, D., Hovatta, T., Drake, A. J., Max-Moerbeck, W., Readhead, A. C. S., & Richards, J. L. The ordinary life of the γ-ray emitting narrow-line Seyfert 1 galaxy PKS 1502+036. United States. doi:10.1093/mnras/stt778.
D'Ammando, F., Orienti, M., Doi, A., Giroletti, M., Dallacasa, D., Hovatta, T., Drake, A. J., Max-Moerbeck, W., Readhead, A. C. S., and Richards, J. L. Mon . "The ordinary life of the γ-ray emitting narrow-line Seyfert 1 galaxy PKS 1502+036". United States. doi:10.1093/mnras/stt778. https://www.osti.gov/servlets/purl/1356571.
@article{osti_1356571,
title = {The ordinary life of the γ-ray emitting narrow-line Seyfert 1 galaxy PKS 1502+036},
author = {D'Ammando, F. and Orienti, M. and Doi, A. and Giroletti, M. and Dallacasa, D. and Hovatta, T. and Drake, A. J. and Max-Moerbeck, W. and Readhead, A. C. S. and Richards, J. L.},
abstractNote = {In this paper, we report on multifrequency observations of the γ-ray emitting narrow-line Seyfert 1 galaxy PKS 1502+036 performed from radio to γ-rays during 2008 August–2012 November by Fermi-Large Area Telescope (LAT), Swift (X-ray Telescope and Ultraviolet/Optical Telescope), Owens Valley Radio Observatory, Very Long Baseline Array (VLBA) and Very Large Array. No significant variability has been observed in γ-rays, with 0.1–100 GeV flux that ranged between (3–7) × 10–8 ph cm–2 s–1 using 3-month time bins. The photon index of the LAT spectrum (Γ = 2.60 ± 0.06) and the apparent isotropic γ-ray luminosity (L0.1-100 GeV = 7.8 × 1045 erg s–1) over 51 months are typical of a flat spectrum radio quasar. The radio spectral variability and the one-sided structure, in addition to the observed γ-ray luminosity, suggest a relativistic jet with a high Doppler factor. In contrast to SBS 0846+513, the VLBA at 15 GHz did not observe superluminal motion for PKS 1502+036. Despite having the optical characteristics typical of a narrow-line Seyfert 1 galaxy, radio and γ-ray properties of PKS 1502+036 are found to be similar to those of a blazar at the low end of the black hole mass distribution for blazars. As a result, this is in agreement with what has been found in the case of the other γ-ray emitting narrow-line Seyfert 1 SBS 0846+513.},
doi = {10.1093/mnras/stt778},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 433,
place = {United States},
year = {2013},
month = {6}
}

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