2003A&A...397..539S


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.12CEST01:54:54

2003A&A...397..539S - Astronomy and Astrophysics, volume 397, 539-544 (2003/1-2)

Close pairs of quasars with different redshifts: New observations and results.

SLUSE D., SURDEJ J., CLAESKENS J.-F., DE ROP Y., LEE D.W., IOVINO A. and HAWKINS M.R.S.

Abstract (from CDS):

Burbidge et al. (1997A&A...320....8B) argue that the observed number of quasar pairs with small angular separations and different redshifts (typically Δθ≤5" and Δz>0.1 ) is not compatible with a random distribution of quasars over the sky. After a brief review of all known quasar pairs with different redshifts, we show by means of very simple calculations that the probability of finding the three accepted pairs accidentally is of the order of 10%. We conclude that, under realistic hypotheses, the observed number of quasar pairs with different redshifts is not unlikely. We also present arguments showing that gravitational lensing biases are probably not strong enough to significantly increase the expected number of quasar pairs. The failure to detect with HST a secondary lensed image of the background quasar near the foreground one in these three pairs supports this view.

Abstract Copyright:

Journal keyword(s): quasars: general - gravitational lensing

CDS comments: In fig.1 : source G = [SRS93] 1009-0252 G.

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 YYG B G 02 38 38.52 +16 36 56.6           ~ 6 0
2 QSO B0235+1624 BLL 02 38 38.93010 +16 36 59.2746   16.46 15.50 15.92   ~ 1423 2
3 [LFK2000] 1009-0252 G G 10 12 -03.1           ~ 11 1
4 QSO B1009-0252C QSO 10 12 15.6214192547 -03 07 00.824022205   18.89 18.79     ~ 18 0
5 QSO B1009-0252B LeQ 10 12 15.73 -03 07 02.4   20.8 20.5     ~ 14 0
6 LBQS 1009-0252 QSO 10 12 15.89 -03 07 03.1   18.82 18.71     ~ 73 1
7 LBQS 1148+0055 QSO 11 51 15.3835840182 +00 38 27.065455063   18.21 18.01     ~ 47 0
8 LBQS 1148+0055B QSO 11 51 15.625 +00 38 25.68   22.06 21.52     ~ 10 0
9 ICRF J155043.5+112047 Sy1 15 50 43.5946354507 +11 20 47.452265270   17.47 17.23 16.5   ~ 164 3
10 QSO B1548+114B QSO 15 50 43.9266623225 +11 20 46.650311181   18.5 19     ~ 51 0

    Equat.    Gal    SGal    Ecl

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2021.05.12-01:54:54

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