2000AJ....119.2031K

Query : 2000AJ....119.2031K

2000AJ....119.2031K - Astron. J., 119, 2031-2037 (2000/May-0)

The X-ray properties of z>4 quasars.

KASPI S., BRANDT W.N. and SCHNEIDER D.P.

Abstract (from CDS):

We report on a search for X-ray emission from quasars with redshifts greater than 4 using the ROSAT public database. Our search has doubled the number of z>4 quasars detected in X-rays from six to 12. Most of those known prior to this work were radio-loud and X-ray-selected sources; our study increases the number of X-ray-detected, optically selected z>4 quasars from one to seven. We present their basic X-ray properties and compare these with those of lower redshift quasars. We do not find any evidence for strong broadband spectral differences between optically selected z>4 quasars and those at lower redshifts.

Abstract Copyright: ∼

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

Simbad objects: 29

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Number of rows : 29
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 QSO B0046-2919 QSO 00 48 29.5640320512 -29 03 21.335341644     19.5     ~ 32 0
6 QSO B0051-2758 QSO 00 54 15.5344651512 -27 42 08.563151268     20.5     ~ 31 0
7 QSO B0101-304 QSO 01 03 37.3953599448 -30 08 59.880019452     20.1     ~ 42 0
8 QSO B0103+00 QSO 01 06 19.2392271120 +00 48 23.369353992   21.68 20.23     ~ 94 0
9 QSO J0338+0021 QSO 03 38 29.3153623704 +00 21 56.241639108   25.10 23.26     ~ 106 0
10 QSO B0351-1034 QSO 03 53 46.9729812432 -10 25 18.977437308     18.7     ~ 32 0
11 QSO B0951-0450 QSO 09 53 55.7485789920 -05 04 18.968856168     19.0     ~ 61 0
12 QSO B0952-0115 QSO 09 55 00.1037541106 -01 30 06.549307797     18.7     ~ 150 0
13 QSO B0953+47 QSO 09 56 25.1645972520 +47 34 42.468198132     19.47     ~ 66 1
14 QSO B1026-084 Bla 10 28 38.79646593 -08 44 38.5362663     21.00 19.6   ~ 77 1
15 [VV98] J105225.9+571907 QSO 10 52 25.88 +57 19 06.7   25.90 23.85 24.7 21.77 ~ 18 1
16 QSO B1050-0000 QSO 10 53 20.4267162840 -00 16 49.652922360   22.49 20.77     ~ 65 0
17 QSO B1144-0723 QSO 11 46 35.6192462328 -07 40 04.821925728     18.60     ~ 25 0
18 QSO B1202-074 QSO 12 05 23.1360370080 -07 42 32.759842896     17.5     ~ 389 5
19 [VV2000] J122600.7+005923 QSO 12 26 00.6813635640 +00 59 23.659046916   21.74 20.24     ~ 35 0
20 QSO B1233+478 QSO 12 35 31.0560584712 +47 36 06.792806124     20.63     ~ 18 0
21 QSO B1251-407 Bla 12 53 59.53371155 -40 59 30.6858434   23.7 19.9 19.9   ~ 54 1
22 [VV2000] J131052.5-005533 QSO 13 10 52.5116110080 -00 55 33.122110944   21.31 19.95     ~ 42 0
23 7C 1428+4218 Bla 14 30 23.74163471 +42 04 36.4910561   24.43 22.04 20.2   ~ 157 1
24 QSO B1508+572 QSO 15 10 02.92237321 +57 02 43.3759220   22.73 21.38 19.23   ~ 223 1
25 QSO J1759+6638 QSO 17 59 28.0940839824 +66 38 52.633688352     21.9 20.220   ~ 31 0
26 QSO B2133-4311 QSO 21 36 23.8 -42 58 18   22.49 20.85     ~ 8 0
27 QSO B2139-4324 QSO 21 42 58.3 -43 10 59     20.64     ~ 7 0
28 QSO B2237-0607 QSO 22 39 53.6812264896 -05 52 19.996061772     18.3     ~ 120 0
29 QSO B2331+0216 QSO 23 34 32.0240241360 +02 33 21.191735700     19.98     ~ 35 0

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