2017A&A...603A.128N


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.19CET07:32:01

2017A&A...603A.128N - Astronomy and Astrophysics, volume 603A, 128-128 (2017/7-1)

The X-ray properties of z ∼ 6 luminous quasars.

NANNI R., VIGNALI C., GILLI R., MORETTI A. and BRANDT W.N.

Abstract (from CDS):

We present a systematic analysis of X-ray archival data of all the 29 quasars (QSOs) at z>5.5 observed so far with Chandra, XMM-Newton and Swift-XRT, including the most-distant quasar ever discovered, ULAS J1120+0641 (z=7.08). This study allows us to place constraints on the mean spectral properties of the primordial population of luminous Type 1 (unobscured) quasars. Eighteen quasars are detected in the X-ray band, and we provide spectral-fitting results for their X-ray properties, while for the others we provide upper limits to their soft (0.5-2.0keV) X-ray flux. We measured the power-law photon index and derived an upper limit to the column density for the five quasars (J1306+0356, J0100+2802, J1030+0524, J1148+5251, J1120+0641) with the best spectra (>30 net counts in the 0.5-7.0keV energy range) and find that they are consistent with values from the literature and lower-redshift quasars. By stacking the spectra of ten quasars detected by Chandra in the redshift range 5.7≥z≥6.1 we find a mean X-ray power-law photon index of Γ=1.92–0.27+0.28 and a neutral intrinsic absorption column density of NH≥1023cm–2. These results suggest that the X-ray spectral properties of luminous quasars have not evolved up to z~=6. We also derived the optical-X-ray spectral slopes (αox) of our sample and combined them with those of previous works, confirming that αox strongly correlates with UV monochromatic luminosity at 2500Å. These results strengthen the non-evolutionary scenario for the spectral properties of luminous active galactic nuclei (AGN).

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: active - galaxies: high-redshift - quasars: general - X-rays: general - X-rays: general

Simbad objects: 30

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Number of rows : 30

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 QSO J0002+2550 QSO 00 02 39.403 +25 50 34.83           ~ 45 0
2 QSO J0005-0006 QSO 00 05 52.333 -00 06 55.65   26.37 25.36     ~ 57 0
3 QSO J0028+0457 QSO 00 28 06.570 +04 57 25.33           ~ 9 0
4 QSO J0100+2802 QSO 01 00 13.0243195069 +28 02 25.790102480           ~ 55 0
5 QSO J0129-0035 QSO 01 29 58.5 -00 35 39           ~ 21 0
6 VST-ATLAS J014243.70-332745.7 QSO 01 42 43.704 -33 27 45.72           ~ 8 0
7 QSO J0148+0600 QSO 01 48 37.639 +06 00 20.01           ~ 26 0
8 QSO J0210-0456 QSO 02 10 13.19 -04 56 20.9           ~ 38 0
9 CFHQS J021627-045534 QSO 02 16 27.81 -04 55 34.1           ~ 18 0
10 QSO J0303-0019 QSO 03 03 31.408 -00 19 12.99           ~ 31 0
11 QSO J0836+0054 QSO 08 36 43.8598686147 +00 54 53.234090138   26.19 24.17     ~ 111 0
12 QSO J0840+5624 QSO 08 40 35.08848 +56 24 19.7712   24.95 23.93     ~ 41 0
13 QSO B1027+0540 QSO 10 30 27.092 +05 24 55.02   26.15 25.44     ~ 209 0
14 QSO J1044-0125 QSO 10 44 33.044 -01 25 02.07     21.81     ~ 145 1
15 QSO J1048+4637 QSO 10 48 45.058 +46 37 18.38   25.87 24.76     ~ 111 0
16 QSO J1120+0641 QSO 11 20 01.48 +06 41 24.3           ~ 152 0
17 QSO J1148+5253 QSO 11 48 16.2 +52 53 39           ~ 12 0
18 QSO J1148+5251 QSO 11 48 16.647 +52 51 50.31   25.73 25.04     ~ 373 0
19 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 601 0
20 QSO J1306+0356 QSO 13 06 08.258 +03 56 26.33   25.59 24.81     ~ 118 0
21 QSO J1335+3533 QSO 13 35 50.809 +35 33 15.80   23.29 22.22     ~ 40 0
22 QSO J1411+1217 QSO 14 11 11.277 +12 17 37.31   24.79 23.82     ~ 58 0
23 QSO J1425+3254 QSO 14 25 16.32672 +32 54 09.6768       23.76 21.15 ~ 19 0
24 [KEC2012] 216.873783+35.369238 QSO 14 27 29.7 +35 22 09       23.99 21.38 ~ 7 1
25 QSO J1602+4228 QSO 16 02 53.982 +42 28 24.86   24.32 24.32     ~ 41 0
26 QSO J1623+3112 QSO 16 23 31.806 +31 12 00.55   24.77 25.16     ~ 60 0
27 QSO J1630+4012 QSO 16 30 33.898 +40 12 09.68   26.45 25.01     ~ 60 0
28 QSO J2053+0047 QSO 20 53 21.752 +00 47 06.58           ~ 10 0
29 PSO J328.7339-09.5076 ? 21 54 56.16000000 -09 30 27.4600000           ~ 1 0
30 [MOK2016b] HSC J2216-0016 Q? 22 16 44.47 -00 16 50.1           ~ 7 0

    Equat.    Gal    SGal    Ecl

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2019.11.19-07:32:01

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