High-energy properties of the high-redshift flat spectrum radio quasar PKS 2149-306
Abstract
We investigate the γ-ray and X-ray properties of the flat spectrum radio quasar PKS 2149-306 at redshift z = 2.345. A strong γ-ray flare from this source was detected by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope satellite in 2013 January, reaching on January 20 a daily peak flux of (301 ± 36)×10-8 ph cm-2 s-1 in the 0.1–100 GeV energy range. This flux corresponds to an apparent isotropic luminosity of (1.5±0.2)×1050 erg s-1, comparable to the highest values observed by a blazar so far. During the flare the increase of flux was accompanied by a significant change of the spectral properties. Moreover significant flux variations on a 6-h time- scale were observed, compatible with the light crossing time of the event horizon of the central black hole. The broad band X-ray spectra of PKS 2149-306 observed by Swift-XRT and NuSTAR are well described by a broken power-law model, with a very hard spectrum (Γ1 ~1) below the break energy, at Ebreak = 2.5–3.0 keV, and Γ2 ~ 1.4–1.5 above the break energy. The steepening of the spectrum below ~3 keV may indicate that the soft X- ray emission is produced by the low-energy relativistic electrons.more »
- Authors:
-
- Univ. of Bologna (Italy); Istituto Nazionale di Astrofisica (INAF), Bologna (Italy)
- Istituto Nazionale di Astrofisica (INAF), Bologna (Italy)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1354853
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Volume: 455; 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, quasars: individual: PKS 2149−306, quasars: general, gamma-rays: galaxies, gamma-rays: general, X-rays: galaxies
Citation Formats
D'Ammando, F., and Orienti, M. High-energy properties of the high-redshift flat spectrum radio quasar PKS 2149-306. United States: N. p., 2015.
Web. doi:10.1093/mnras/stv2452.
D'Ammando, F., & Orienti, M. High-energy properties of the high-redshift flat spectrum radio quasar PKS 2149-306. United States. https://doi.org/10.1093/mnras/stv2452
D'Ammando, F., and Orienti, M. Thu .
"High-energy properties of the high-redshift flat spectrum radio quasar PKS 2149-306". United States. https://doi.org/10.1093/mnras/stv2452. https://www.osti.gov/servlets/purl/1354853.
@article{osti_1354853,
title = {High-energy properties of the high-redshift flat spectrum radio quasar PKS 2149-306},
author = {D'Ammando, F. and Orienti, M.},
abstractNote = {We investigate the γ-ray and X-ray properties of the flat spectrum radio quasar PKS 2149-306 at redshift z = 2.345. A strong γ-ray flare from this source was detected by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope satellite in 2013 January, reaching on January 20 a daily peak flux of (301 ± 36)×10-8 ph cm-2 s-1 in the 0.1–100 GeV energy range. This flux corresponds to an apparent isotropic luminosity of (1.5±0.2)×1050 erg s-1, comparable to the highest values observed by a blazar so far. During the flare the increase of flux was accompanied by a significant change of the spectral properties. Moreover significant flux variations on a 6-h time- scale were observed, compatible with the light crossing time of the event horizon of the central black hole. The broad band X-ray spectra of PKS 2149-306 observed by Swift-XRT and NuSTAR are well described by a broken power-law model, with a very hard spectrum (Γ1 ~1) below the break energy, at Ebreak = 2.5–3.0 keV, and Γ2 ~ 1.4–1.5 above the break energy. The steepening of the spectrum below ~3 keV may indicate that the soft X- ray emission is produced by the low-energy relativistic electrons. This is in agreement with the small variability amplitude and the lack of spectral changes in that part of the X-ray spectrum observed between the two NuSTAR and Swift joint observations. As for the other high-redshift FSRQ detected by both Fermi-LAT and Swift-BAT, the photon index of PKS 2149-306 in hard X-ray is 1.6 or lower and the average γ-ray luminosity higher than 2×1048 erg s-1.},
doi = {10.1093/mnras/stv2452},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 455,
place = {United States},
year = {Thu Nov 19 00:00:00 EST 2015},
month = {Thu Nov 19 00:00:00 EST 2015}
}
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