2001A&A...372....1Z


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.26CEST14:25:25

2001A&A...372....1Z - Astronomy and Astrophysics, volume 372, 1-7 (2001/6-2)

Quasar pairs with arcminute angular separations.

ZHDANOV V.I. and SURDEJ J.

Abstract (from CDS):

We use the Veron-Cetty & Veron (2000) catalog (VV) of 13 213 quasars to investigate their possible physical grouping over angular scales 10"≤Δθ≤1000". We first estimate the number of quasar pairs that would be expected in VV assuming a random distribution for the quasar positions and taking into account observational selection effects affecting heterogeneous catalogs. We find in VV a statistically significant (>3σ) excess of pairs of quasars with similar redshifts (Δz≤0.01) and angular separations in the 50"-100" range, corresponding to projected linear separations (0.2-0.5)Mpc/h75M=1, ΩΛ=0) or (0.4-0.7)Mpc/h75M=0.3, ΩΛ=0.7). There is also some excess in the 100"-600" range corresponding to (1-5) Mpc in projected linear separations. If most of these quasar pairs do indeed belong to large physical entities, these separations must represent the inner scales of huge mass concentrations (cf. galaxy clusters or superclusters) at high redshifts; but it is not excluded that some of the pairs may actually consist of multiple quasar images produced by gravitational lensing. Of course, a fraction of these pairs could also arise due to random projections of quasars on the sky. The list of 11 pairs of quasars with redshift differences Δz≤0.02 and angular separations 50"≤Δθ≤100" is presented in order to stimulate further observational studies and to better understand the astrophysical and cosmological significance of these interesting objects.

Abstract Copyright:

Journal keyword(s): quasars - clusters - gravitational lenses - observations

Simbad objects: 22

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Number of rows : 22

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 B0053-3342A QSO 00 56 02.0842142788 -33 26 16.516100894     20.07     ~ 4 0
2 QSO B0053-3342B QSO 00 56 08.7643309304 -33 26 10.622333192     18.86     ~ 4 0
3 LBQS 0107-0235 QSO 01 10 13.1605010207 -02 19 52.838365692   18.39 17.80 17.61   ~ 73 1
4 QSO J0110-0218 QSO 01 10 16.2699632294 -02 18 50.763174832   17.4 17.3     ~ 54 1
5 [VV96] J031741.2-531159 QSO 03 17 41.2202250584 -53 11 58.907935298   19.1 19.1     ~ 6 0
6 [VV96] J031743.2-531103 QSO 03 17 43.2180807701 -53 11 03.956913812   19.1 19.1     ~ 6 0
7 QSO B1310+4254A QSO 13 12 15.2354543238 +42 39 00.885377942   18.93 18.73   17.97 ~ 45 0
8 QSO B1310+4254B QSO 13 12 22.383 +42 38 13.89   21.19     19.85 ~ 23 0
9 [VV2000] J133445.4+375723 QSO 13 34 45.3494218566 +37 57 22.711813473   20.85 20.70 20.5   ~ 12 0
10 [VV2000] J133452.1+375745 QSO 13 34 52.1607124534 +37 57 44.588051990   20.46 20.19 20.1   ~ 11 0
11 [VV96] J133531.3+254918 QSO 13 35 31.1508818090 +25 49 18.673346407   19.41 19.09     ~ 14 0
12 [VV96] J133534.4+254824 QSO 13 35 34.233 +25 48 24.78   20.35 19.81     ~ 6 0
13 [VV96] J133849.3+274913 QSO 13 38 49.356 +27 49 15.40   20.32 19.83     ~ 7 0
14 [VV96] J133855.9+274837 QSO 13 38 55.999 +27 48 38.25   19.63 19.28     ~ 7 0
15 QSO B2121-4642 QSO 21 24 53.9579918415 -46 29 28.879277931   19.41 18.79     ~ 6 0
16 QSO B2121-4641 QSO 21 24 58.1196379280 -46 28 18.737147811     20.30     ~ 6 0
17 QSO B2139-4433 QSO 21 42 22.1692806884 -44 19 29.743549966   21.21 20.18     ~ 17 0
18 LBQS 2139-4434 QSO 21 42 25.7847067944 -44 20 18.353629202   18.83 16.64     ~ 43 0
19 QSO B2207-1940 QSO 22 10 25.3483611424 -19 25 13.359130544   20.7 20.73     ~ 7 0
20 QSO B2207-1938 QSO 22 10 25.6240738902 -19 24 03.260969630   20.1 20.13     ~ 7 0
21 [VV98] J235635.8+185635 QSO 23 56 35.697 +18 56 35.51     18.50     ~ 5 0
22 QSO B2354+1840 QSO 23 56 41.033 +18 57 35.10     19.30     ~ 6 0

    Equat.    Gal    SGal    Ecl

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2020.09.26-14:25:25

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