2001AJ....122.2143V

Query : 2001AJ....122.2143V

2001AJ....122.2143V - Astron. J., 122, 2143-2155 (2001/November-0)

Exploratory Chandra observations of the highest-redshift quasars: x-rays from the dawn of the modern universe.

VIGNALI C., BRANDT W.N., FAN X., GUNN J.E., KASPI S., SCHNEIDER D.P. and STRAUSS M.A.

Abstract (from CDS):

We report exploratory Chandra observations of 14 high-redshift (z=4.06-5.27), optically selected quasars. Ten of these quasars are detected, increasing the number of z>4 X-ray detected quasars by 71%. Our detections include four of the five highest-redshift X-ray detected quasars to date, among them SDSSp J021043.17-001818.4, the highest-redshift (z=4.77) radio-loud quasar detected in the X-ray band. The four undetected objects are the broad absorption-line quasars SDSSp J112956.10-014212.4 and SDSSp J160501.21-011220.0, the weak emission-line quasar SDSSp J153259.96-003944.1, and the quasar PSS 1435+3057. A comparison of the quasars' spectral energy distributions (by means of the optical-to-X-ray spectral index αox) with those of lower-redshift samples indicates that the Chandra quasars are X-ray fainter by a factor of ~2. X-ray faintness could be associated with the presence of large amounts of gas in the primeval galaxies harboring these high-redshift quasars, as suggested by recent studies conducted on z>4 quasars in other bands. Using the current Chandra data, predictions for the next generation of X-ray observatories, Constellation-X and XEUS, are also provided.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Active - Galaxies: Nuclei - Galaxies: Quasars: General - X-Rays

Simbad objects: 51

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Number of rows : 51
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 QSO J0003-2603 QSO 00 03 22.9531962024 -26 03 18.304471908   18 17.53     ~ 293 0
2 QSO B0019-1522 QSO 00 22 08.0390087400 -15 05 39.983288316     19.0     ~ 59 0
3 [VV98] J002950.0+054204 QSO 00 29 50.0 +05 42 04     21.49     ~ 13 0
4 [VV96] J003004.7+053813 QSO 00 30 04.7 +05 38 13     21.93     ~ 15 0
5 2MASS J00454722+0410233 Sy1 00 45 47.2231233240 +04 10 23.386759392   15.88 16.00     ~ 163 0
6 QSO B0046-2919 QSO 00 48 29.5640320512 -29 03 21.335341644     19.5     ~ 32 0
7 QSO B0051-2758 QSO 00 54 15.5344651512 -27 42 08.563151268     20.5     ~ 31 0
8 QSO B0101-304 QSO 01 03 37.3953599448 -30 08 59.880019452     20.1     ~ 42 0
9 QSO B0103+00 QSO 01 06 19.2392271120 +00 48 23.369353992   21.68 20.23     ~ 94 0
10 QSO J0210-0018 QSO 02 10 43.1633481288 -00 18 18.444357900   23.49 21.97     ~ 69 0
11 QSO J0211-0009 QSO 02 11 02.7239895552 -00 09 10.336384080     22.00     ~ 45 0
12 QSO B0241-01 QSO 02 44 01.8451874040 -01 34 03.848758680     18.20     ~ 65 0
13 QSO J0248+1802 QSO 02 48 54.2720204400 +18 02 49.274967876     18.4     ~ 49 0
14 QSO J0338+0021 QSO 03 38 29.3153623704 +00 21 56.241639108   25.10 23.26     ~ 106 0
15 QSO B0351-1034 QSO 03 53 46.9729812432 -10 25 18.977437308     18.7     ~ 32 0
16 QSO J0525-3343 Bla 05 25 06.1749810960 -33 43 05.643939828     18.50 18.5   ~ 62 1
17 QSO B0951-0450 QSO 09 53 55.7485789920 -05 04 18.968856168     19.0     ~ 61 0
18 QSO B0952-0115 QSO 09 55 00.1037541106 -01 30 06.549307797     18.7     ~ 150 0
19 QSO B0953+47 QSO 09 56 25.1645972520 +47 34 42.468198132     19.47     ~ 66 1
20 QSO B1026-084 Bla 10 28 38.79646593 -08 44 38.5362663     21.00 19.6   ~ 77 1
21 QSO B1033-033 QSO 10 36 23.7457432848 -03 43 18.929156772     18.5     ~ 74 0
22 SDSS J104433.04-012502.0 QSO 10 44 33.040 -01 25 02.08     21.81     ~ 182 1
23 [VV98] J105225.9+571907 QSO 10 52 25.88 +57 19 06.7   25.90 23.85 24.7 21.77 ~ 18 1
24 QSO B1050-0000 QSO 10 53 20.4267162840 -00 16 49.652922360   22.49 20.77     ~ 65 0
25 QSO J1057+4555 QSO 10 57 56.2610108784 +45 55 53.070401748   20.19 18.80 17.2 16.8 ~ 118 0
26 QSO J1129-0142 QSO 11 29 56.0823899784 -01 42 12.363129684   25.68 23.61     ~ 33 0
27 QSO B1144-0723 QSO 11 46 35.6192462328 -07 40 04.821925728     18.60     ~ 25 0
28 QSO B1202-074 QSO 12 05 23.1360370080 -07 42 32.759842896     17.5     ~ 389 5
29 QSO J1208+0010 QSO 12 08 23.82 +00 10 27.8     20.79     ~ 37 0
30 [VV2000] J122600.7+005923 QSO 12 26 00.6813635640 +00 59 23.659046916   21.74 20.24     ~ 35 0
31 QSO B1233+478 QSO 12 35 31.0560584712 +47 36 06.792806124     20.63     ~ 18 0
32 COLDz -cont-GN-10 rG 12 36 42.093 +62 13 31.29 26.61 27.03 26.43 25.8 25.7254 ~ 75 0
33 QSO B1247+3406 QSO 12 49 42.1288582896 +33 49 53.854426452     20.4     ~ 51 0
34 QSO B1251-407 Bla 12 53 59.53371155 -40 59 30.6858434   23.7 19.9 19.9   ~ 54 1
35 LB 2522 Sy1 13 01 12.9250750776 +59 02 06.693816732   16.04 15.89     ~ 298 0
36 [VV2000] J131052.5-005533 QSO 13 10 52.5116110080 -00 55 33.122110944   21.31 19.95     ~ 42 0
37 QSO J1317+3531 QSO 13 17 43.1304151704 +35 31 31.964624292   22.58 20.95     ~ 43 0
38 7C 1428+4218 Bla 14 30 23.74163471 +42 04 36.4910561   24.43 22.04 20.2   ~ 157 1
39 QSO J1435+3057 QSO 14 35 23.4209397504 +30 57 21.989586096   21.86 20.51     ~ 39 0
40 QSO J1443+2724 QSO 14 43 31.1697928632 +27 24 36.768781008     19.3     ~ 94 0
41 QSO B1508+572 QSO 15 10 02.92237321 +57 02 43.3759220   22.73 21.38 19.23   ~ 223 1
42 QSO J1532-0039 QSO 15 32 59.9585073048 -00 39 43.819557948   23.88 22.26     ~ 33 0
43 LEDA 56356 Sy1 15 54 44.5798403976 +08 22 21.412038576   16.38 16.16     ~ 132 0
44 QSO J1605-0112 QSO 16 05 01.2156865656 -01 12 20.699725824   26.55 24.30     ~ 42 0
45 IRAS 17002+5153 Sy1 17 01 24.8265469104 +51 49 20.447878836   15.49 15.12     ~ 401 0
46 QSO J1759+6638 QSO 17 59 28.0940839824 +66 38 52.633688352     21.9 20.220   ~ 31 0
47 QSO B2133-4311 QSO 21 36 23.8 -42 58 18   22.49 20.85     ~ 8 0
48 QSO B2139-4324 QSO 21 42 58.3 -43 10 59     20.64     ~ 7 0
49 Z 428-65 Sy1 22 17 12.2637639888 +14 14 20.917852980   15.02 14.66     ~ 371 0
50 QSO B2237-0607 QSO 22 39 53.6812264896 -05 52 19.996061772     18.3     ~ 120 0
51 QSO B2331+0216 QSO 23 34 32.0240241360 +02 33 21.191735700     19.98     ~ 35 0

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