High-energy properties of the high-redshift flat spectrum radio quasar PKS 2149-306

D'Ammando, F.; Orienti, M.

doi:10.1093/mnras/stv2452

Title: High-energy properties of the high-redshift flat spectrum radio quasar PKS 2149-306

Journal Article · 18 November 2015 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stv2452 · OSTI ID:1354853

D'Ammando, F. ^[1]; Orienti, M. ^[2]

Univ. of Bologna (Italy); Istituto Nazionale di Astrofisica (INAF), Bologna (Italy)
Istituto Nazionale di Astrofisica (INAF), Bologna (Italy)

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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1354853

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 2 Vol. 455; ISSN 0035-8711

Publisher:: Royal Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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