2005A&A...442..495D


Query : 2005A&A...442..495D

2005A&A...442..495D - Astronomy and Astrophysics, volume 442, 495-500 (2005/11-1)

Discovery of nine quasars behind the Large Magellanic Cloud.

DOBRZYCKI A., EYER L., STANEK K.Z. and MACRI L.M.

Abstract (from CDS):

We present the discovery of nine quasars behind the Large Magellanic Cloud, with emission redshifts ranging from 0.07 to 2.09. Six of them were identified as part of the systematic variability-based search for QSOs in the objects from the OGLE-II database. Combination of variability-based selection of candidates with the candidates' colours appears to be a powerful technique for identifying quasars, potentially reaching ∼50% efficiency. We report an apparent correlation between variability magnitude and variability timescale, which - if confirmed - could put even more constraints on QSO candidate selection. The remaining three quasars were identified via followup spectroscopy of optical counterparts to X-ray sources found serendipitously by the Chandra X-ray Observatory satellite. Even though the locations of the candidates were quite uniformly distributed over the LMC bar, the confirmed QSOs all appear near the bar's outskirts.

Abstract Copyright:

Journal keyword(s): Magellanic Clouds - quasars: general

CDS comments: Paragr. 3.1: L142, L143, L146 = respectively OGLE J054324.00-702023.2, OGLE J054610.03-704328.3, OGLE J054659.65-705443.0. Paragr. 3.2: S1, S12 = respectively OGLE J003850.79-731053.1, OGLE J010234.69-725424.1. Table 1: new quasars = OGLE JHHMMSS.ss+DDMMSS.s in SIMBAD.

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 [VV2006] J003850.8-731053 Sy1 00 38 50.8 -73 10 53   17.741 17.694     ~ 7 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11228 1
3 [VV2006] J010234.7-725422 QSO 01 02 34.7415419784 -72 54 24.365368080   18.688 18.346   17.641 ~ 12 0
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7127 0
5 [VV2006] J050514.4-700051 QSO 05 05 14.4 -70 00 51 19.559 20.927 19.955   19.308 ~ 4 0
6 [VV2006c] J050550.3-675017 QSO 05 05 50.3913415248 -67 50 17.955756528   17.5 18.190 17.980 17.30 ~ 8 0
7 [VV2006] J050900.7-672114 QSO 05 09 00.6993860568 -67 21 13.977925884     20.48   19.40 ~ 4 0
8 [VV2006] J050940.6-685320 QSO 05 09 40.6 -68 53 20     19.79     ~ 3 0
9 2XMM J051244.4-693858 QSO 05 12 44.5508907768 -69 38 57.072714432 18.702 19.781 18.900   17.640 ~ 5 0
10 [VV2006] J051433.6-693245 QSO 05 14 33.4692674712 -69 32 45.659829732 18.478 18.841 18.55   17.78 ~ 8 0
11 [VV2006] J052141.7-703029 QSO 05 21 41.620 -70 30 28.90     19.18   18.56 ~ 5 0
12 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17555 0
13 [VV2006] J052627.6-693425 QSO 05 26 27.6 -69 34 25     19.81     ~ 3 0
14 [VV2006] J053400.0-703128 QSO 05 33 59.9406858792 -70 31 28.080374232     19.34   19.13 ~ 4 0
15 OGLE J054324.00-702023.2 * 05 43 24.00 -70 20 23.2           ~ 1 0
16 OGLE J054610.03-704328.3 * 05 46 10.03 -70 43 28.3           ~ 1 0
17 OGLE J054659.65-705443.0 * 05 46 59.65 -70 54 43.0           ~ 1 0
18 NAME Galactic Bulge reg ~ ~           ~ 4332 0

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