2005A&A...442L..53P


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.22CEST17:32:28

2005A&A...442L..53P - Astronomy and Astrophysics, volume 442, L53-56 (2005/11-2)

XMM-Newton discovery of soft X-ray absorption in the high-z superluminous Blazar RBS 315.

PICONCELLI E. and GUAINAZZI M.

Abstract (from CDS):

We present the analysis and the results of a 20ks XMM-Newton observation of the extremely X-ray loud (LX≃5x1047erg/s) flat-spectrum radio quasar RBS 315 at a redshift of 2.69. This EPIC observation has allowed us to strongly constrain the slope of the continuum (Γ=1.23±0.01) as well as to discover the presence of a sharp drop below ≃2keV in its spectrum. Such a flat photon index and the huge luminosity suggest that the X-ray emission is due to the low energy tail of the Comptonized spectrum, produced from plasma in a relativistic jet oriented close to our line of sight. Even though the hypothesis of a break in the continuum cannot be completely discarded as an explanation of the soft X-ray cutoff, the presence of intrinsic absorption appears more plausible. Spectral fits with cold (NHz=1.62+0.09–0.09x1022cm–2) and lukewarm (NHz=2.2+0.9–0.3x1022cm–2; ξ=15+38–12erg/cm2/s) absorbers are statistically indistinguishable. Remarkably, our results are very similar to those reported so far for other absorbed high-z Blazars observed by XMM-Newton. The existence of this ``homogeneous'' class of jet-dominated superluminous obscured QSOs at high z therefore could be important in the context of the formation and cosmological evolution of radio-loud objects.

Abstract Copyright:

Journal keyword(s): galaxies: active - quasar: general - X-ray: individual: RBS 315

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 QSO J0225+1846 QSO 02 25 04.6672463736 +18 46 48.759971912   20.0 20.0 19.09   ~ 69 1
2 QSO J0525-3343 QSO 05 25 06.1754530726 -33 43 05.643316632     18.50 18.5   ~ 47 1
3 QSO B2126-15 QSO 21 29 12.17589777 -15 38 41.0413097   17.61 17.3 17.3   ~ 456 1

    Equat.    Gal    SGal    Ecl

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2019.09.22-17:32:28

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