2003A&A...404..145A

Query : 2003A&A...404..145A

2003A&A...404..145A - Astronomy and Astrophysics, volume 404, 145-156 (2003/6-2)

Bulge microlensing optical depth from EROS 2 observations.

AFONSO C., ALBERT J.N., ALARD C., ANDERSEN J., ANSARI R., AUBOURG E., BAREYRE P., BAUER F., BEAULIEU J.P., BLANC G., BOUQUET A., CHAR S., CHARLOT X., COUCHOT F., COUTURES C., DERUE F., FERLET R., FOUQUE P., GLICENSTEIN J.F., GOLDMAN B., GOULD A., GRAFF D., GROS M., HAISSINSKI J., HAMADACHE C., HAMILTON J.C., HARDIN D., DE KAT J., KIM A., LASSERRE T., LE GUILLOU L., LESQUOY E., LOUP C., MAGNEVILLE C., MANSOUX B., MARQUETTE J.B., MAURICE E., MAURY A., MILSZTAJN A., MONIEZ M., PALANQUE-DELABROUILLE N., PERDEREAU O., PREVOT L., REGNAULT N., RICH J., SPIRO M., TISSERAND P., VIDAL-MADJAR A., VIGROUX L. and ZYLBERAJCH S.

Abstract (from CDS):

We present a measurement of the microlensing optical depth toward the Galactic bulge based on the analysis of 15 contiguous 1deg2 fields centered on (l=2.5°, b=-4.0°) and containing N*=1.42x106 clump-giant stars (belonging to the extended clump area) monitored during almost three bulge seasons by EROS (Experience de Recherche d'Objets Sombres). We find τbulge=0.94±0.29x10–6 averaged over all fields, based on 16 microlensing events with clump giants as sources. This value is substantially below several other determinations by the MACHO and OGLE groups and is more in agreement with what is expected from axisymmetric and non-axisymmetric bulge models.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: stellar content - Galaxy: structure - gravitational lensing

Nomenclature: Table 3: [AAA2003] NN (Nos 1-16) = EROS2-BLG NN N=16 among (Nos 2-35).

CDS comments: These are EROS2 observations and thus they are called EROS2-BLG NN in Simbad and not EROS-BLG NN as proposed by the authors in the article. objects OGLE = EWS YYYY-AAA-NN, EROS YY-BLG NN = EROS BLG YYYY NN in Simbad.

Simbad objects: 16

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Number of rows : 16
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 MACHO 97-BLG-26 * 18 00 06.94 -29 38 06.0           ~ 7 0
2 EROS2-BLG 3 * 18 00 46.4 -29 06 56   17.9       ~ 1 0
3 OGLE BUL-SC30 57488 * 18 01 02.52 -29 00 11.6   16.6       ~ 4 0
4 OGLE BUL-SC38 120518 * 18 01 10.23 -29 48 55.2           ~ 6 0
5 MACHO 96-BLG-12 * 18 03 53.20 -27 57 35.7           G2III 10 0
6 OGLE BUL-SC35 144974 * 18 04 09.68 -27 44 35.1   17.2       ~ 7 0
7 OGLE BUL-SC35 451130 * 18 04 33.6020757736 -28 07 32.128002232           ~ 7 0
8 EROS2-BLG 16 * 18 04 57.5 -29 40 10   17.3       ~ 1 0
9 EROS2-BLG 18 * 18 06 20.4 -27 56 13   17.4       ~ 1 0
10 EROS BLG 1998 2 * 18 07 06.5 -28 42 31   17.5       ~ 2 0
11 MACHO 97-BLG-5 * 18 08 51.3 -28 27 11   17.6       ~ 1 0
12 EROS2-BLG 29 * 18 10 56.2 -29 24 24   15.5       ~ 3 0
13 EROS2-BLG 32 * 18 11 51.5 -29 00 34   17.5       ~ 1 0
14 EROS2-BLG 31 * 18 12 43.4 -29 38 28   17.6       ~ 2 0
15 EROS2-BLG 35 * 18 13 26.7 -27 21 54   17.3       ~ 1 0
16 EROS2-BLG 33 * 18 14 32.5 -29 14 46   16.7       ~ 1 0

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