The awakening of the γ-ray narrow-line Seyfert 1 galaxy PKS 1502+036
Abstract
After a long low-activity period, we detected a γ-ray flare from the narrow-line Seyfert 1 PKS 1502+036 (z = 0.4089) by the Large Area Telescope (LAT) on board Fermi in 2015. On 2015 December 20, the source reached a daily peak flux, in the 0.1–300 GeV band, of (93 ± 19) × 10-8 ph cm-2 s-1, attaining a flux of (237 ± 71) × 10-8 ph cm-2 s-1 on 3-h time-scales, which corresponds to an isotropic luminosity of (7.3 ± 2.1) × 1047 erg s-1. The γ-ray flare was not accompanied by significant spectral changes. We report on multiwavelength radio-to-γ-ray observations of PKS 1502+036 during 2008 August–2016 March by Fermi-LAT, Swift, XMM–Newton, Catalina Real-Time Transient Survey and the Owens Valley Radio Observatory (OVRO). An increase in activity was observed on 2015 December 22 by Swift in optical, UV and X-rays. The OVRO 15 GHz light curve reached the highest flux density observed from this source on 2016 January 12, indicating a delay of about three weeks between the γ-ray and 15 GHz emission peaks. Furthermore, this suggests that the γ-ray-emitting region is located beyond the broad-line region. We also compared the spectral energy distribution (SED) of an average activity statemore »
- Authors:
-
- Univ. of Bologna (Italy). Dept. of Physics and Astronomy; National Inst. of Astrophysics (INAF), Bologna (Italy). Inst. of Radio Astronomy
- National Inst. of Astrophysics (INAF), Bologna (Italy). Inst. of Radio Astronomy
- U.S. Naval Research Lab., Washington, DC (United States)
- Aalto Univ. Metsahova Radio Observatory, Kylmalal (Finland)
- Max Planck Inst. for Radio Astronmy, Bonn (Germany)
- California Inst. of Technology (CalTech), Pasadena, CA (United States). Cahill Center for Astronomy and Astrophysics
- Univ. of Concepcion (Chile). Dept. of Astronomy
- Purdue Univ., West Lafayette, IN (United States). Dept. of Physics
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- Fermi LAT Collaboration
- OSTI Identifier:
- 1355718
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Volume: 463; 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: individual: PKS 1502+036; galaxies: jets; galaxies: nuclei; galaxies: Seyfert; gamma-rays: general
Citation Formats
D'Ammando, F., Orienti, M., Finke, J., Hovatta, T., Giroletti, M., Max-Moerbeck, W., Pearson, T. J., Readhead, A. C. S., Reeves, R. A., and Richards, J. L. The awakening of the γ-ray narrow-line Seyfert 1 galaxy PKS 1502+036. United States: N. p., 2016.
Web. doi:10.1093/mnras/stw2325.
D'Ammando, F., Orienti, M., Finke, J., Hovatta, T., Giroletti, M., Max-Moerbeck, W., Pearson, T. J., Readhead, A. C. S., Reeves, R. A., & Richards, J. L. The awakening of the γ-ray narrow-line Seyfert 1 galaxy PKS 1502+036. United States. https://doi.org/10.1093/mnras/stw2325
D'Ammando, F., Orienti, M., Finke, J., Hovatta, T., Giroletti, M., Max-Moerbeck, W., Pearson, T. J., Readhead, A. C. S., Reeves, R. A., and Richards, J. L. Wed .
"The awakening of the γ-ray narrow-line Seyfert 1 galaxy PKS 1502+036". United States. https://doi.org/10.1093/mnras/stw2325. https://www.osti.gov/servlets/purl/1355718.
@article{osti_1355718,
title = {The awakening of the γ-ray narrow-line Seyfert 1 galaxy PKS 1502+036},
author = {D'Ammando, F. and Orienti, M. and Finke, J. and Hovatta, T. and Giroletti, M. and Max-Moerbeck, W. and Pearson, T. J. and Readhead, A. C. S. and Reeves, R. A. and Richards, J. L.},
abstractNote = {After a long low-activity period, we detected a γ-ray flare from the narrow-line Seyfert 1 PKS 1502+036 (z = 0.4089) by the Large Area Telescope (LAT) on board Fermi in 2015. On 2015 December 20, the source reached a daily peak flux, in the 0.1–300 GeV band, of (93 ± 19) × 10-8 ph cm-2 s-1, attaining a flux of (237 ± 71) × 10-8 ph cm-2 s-1 on 3-h time-scales, which corresponds to an isotropic luminosity of (7.3 ± 2.1) × 1047 erg s-1. The γ-ray flare was not accompanied by significant spectral changes. We report on multiwavelength radio-to-γ-ray observations of PKS 1502+036 during 2008 August–2016 March by Fermi-LAT, Swift, XMM–Newton, Catalina Real-Time Transient Survey and the Owens Valley Radio Observatory (OVRO). An increase in activity was observed on 2015 December 22 by Swift in optical, UV and X-rays. The OVRO 15 GHz light curve reached the highest flux density observed from this source on 2016 January 12, indicating a delay of about three weeks between the γ-ray and 15 GHz emission peaks. Furthermore, this suggests that the γ-ray-emitting region is located beyond the broad-line region. We also compared the spectral energy distribution (SED) of an average activity state with that of the flaring state. The two SED, with the high-energy bump modelled as an external Compton component with seed photons from a dust torus, could be fitted by changing the electron distribution parameters as well as the magnetic field. Furthermore, the fit of the disc emission during the average state constrains the black hole mass to values lower than 108 M⊙. The SED, high-energy emission mechanisms and γ-ray properties of the source resemble those of a flat spectrum radio quasar.},
doi = {10.1093/mnras/stw2325},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 4,
volume = 463,
place = {United States},
year = {Wed Sep 14 00:00:00 EDT 2016},
month = {Wed Sep 14 00:00:00 EDT 2016}
}
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