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

Full paper

View the references in ADS

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 - 2023	#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			~	10839	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						~	6820	1
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			~	16970	1
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	~	~						~	4159	0

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