2006A&A...454..185H

Query : 2006A&A...454..185H

2006A&A...454..185H - Astronomy and Astrophysics, volume 454185-199 (2006/7-4)

Galactic Bulge microlensing optical depth from EROS-2.

HAMADACHE C., LE GUILLOU L., TISSERAND P., AFONSO C., ALBERT J.N., ANDERSEN J., ANSARI R., AUBOURG E., BAREYRE P., BEAULIEU J.P., CHARLOT X., COUTURES C., FERLET R., FOUQUE P., GLICENSTEIN J.F., GOLDMAN B., GOULD A., GRAFF D., GROS M., HAISSINSKI J., DE KAT J., LESQUOY E., LOUP C., MAGNEVILLE C., MARQUETTE J.B., MAURICE E., MAURY A., MILSZTAJN A., MONIEZ M., PALANQUE-DELABROUILLE N., PERDEREAU O., RAHAL Y.R., RICH J., SPIRO M., VIDAL-MADJAR A., VIGROUX L. and ZYLBERAJCH S.

Abstract (from CDS):

We present a new EROS-2 measurement of the microlensing optical depth toward the Galactic Bulge. Light curves of 5.6x106 clump-giant stars distributed over 66deg2 of the Bulge were monitored during seven Bulge seasons. 120 events were found with apparent amplifications greater than 1.6 and Einstein radius crossing times in the range 5d<tE<400d. This is the largest existing sample of clump-giant events and the first to include northern Galactic fields. In the Galactic latitude range 1.4°<|b|<7.0°, we find τ/10–6=(1.62±0.23)exp[-a(|b|-3°)] with a=(0.43±0.16)°–1. These results are in good agreement with our previous measurement, with recent measurements of the MACHO and OGLE-II groups, and with predictions of Bulge models.

Abstract Copyright: ∼

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

VizieR on-line data: <Available at CDS (J/A+A/454/185): table3.dat>

Nomenclature: Table 3: EROS2 FFF-N-N-NNNNN N=121.

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

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 - 2026 		#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
3 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
4 OGLE BUL-SC3 91382 * 17 53 09.33 -30 01 12.1           ~ 7 0
5 OGLE BUL-SC4 522952 * 17 54 38.64 -29 33 12.8     17.94     ~ 4 0
6 OGLE BUL-SC20 395103 * 17 59 08.99 -28 24 54.7           K2III 9 0
7 MACHO 97-BLG-26 * 18 00 06.94 -29 38 06.0           ~ 7 0
8 OGLE BUL-SC30 57488 * 18 01 02.52 -29 00 11.6   16.6       ~ 4 0
9 MACHO 113.19192.365 * 18 01 06.96 -29 18 53.6           ~ 2 0
10 OGLE BUL-SC30 165305 * 18 01 07.6919295216 -28 31 41.637698400           ~ 3 0
11 OGLE BUL-SC38 120518 * 18 01 10.23 -29 48 55.2           ~ 6 0
12 NAME Baade Window reg 18 03.5 -30 01           ~ 643 3
13 OGLE BUL-SC35 144974 * 18 04 09.68 -27 44 35.1   17.2       ~ 7 0
14 OGLE BUL-SC35 451130 * 18 04 33.6020757736 -28 07 32.128002232           ~ 7 0
15 MACHO 110.22455.842 * 18 08 51.36 -28 27 11.2           ~ 2 0
16 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
17 OGLE BUL-SC3 371229 * ~ ~           ~ 1 0
18 OGLE BUL-SC37 645044 * ~ ~           ~ 1 0
19 OGLE BUL-SC30 636963 * ~ ~           ~ 1 0
20 NAME Galactic Bar reg ~ ~           ~ 1458 0
21 NAME Galactic Bulge reg ~ ~           ~ 4794 0
22 OGLE BUL-SC22 414328 * ~ ~           ~ 1 0

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