2005A&A...443..911C


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.01CET09:37:12

2005A&A...443..911C - Astronomy and Astrophysics, volume 443, 911-928 (2005/12-1)

POINT-AGAPE pixel lensing survey of M31. Evidence for a MACHO contribution to galactic halos.

CALCHI NOVATI S., PAULIN-HENRIKSSON S., AN J., BAILLON P., BELOKUROV V., CARR B.J., CREZE M., EVANS N.W., GIRAUD-HERAUD Y., GOULD A., HEWETT P., JETZER P., KAPLAN J., KERINS E., SMARTT S.J., STALIN C.S., TSAPRAS Y., WESTON M.J. (The POINT-AGAPE Collaboration)

Abstract (from CDS):

The POINT-AGAPE collaboration is carrying out a search for gravitational microlensing toward M31 to reveal galactic dark matter in the form of MACHOs (Massive Astrophysical Compact Halo Objects) in the halos of the Milky Way and M31. A high-threshold analysis of 3 years of data yields 6 bright, short-duration microlensing events, which are confronted to a simulation of the observations and the analysis. The observed signal is much larger than expected from self lensing alone and we conclude, at the 95% confidence level, that at least 20% of the halo mass in the direction of M31 must be in the form of MACHOs if their average mass lies in the range 0.5-1M. This lower bound drops to 8% for MACHOs with masses ∼0.01M. In addition, we discuss a likely binary microlensing candidate with caustic crossing. Its location, some 32' away from the centre of M31, supports our conclusion that we are detecting a MACHO signal in the direction of M31.

Abstract Copyright:

Journal keyword(s): galaxies: halos - gravitational lensing - dark matter - galaxies: individual: M31

Nomenclature: Text, Table 3: PA YY-WN (Nos 99-N2, PA 00-SPA 00-S4, 3, PA 00-N6, PA 99-S7) added.

Simbad objects: 17

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Number of rows : 17

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 MEGA-ML 12 Lev 00 41 26.90 +40 49 42.1           ~ 5 0
2 PA 00-N6 Lev 00 42 10.70 +41 19 45.4           ~ 2 0
3 PA 00-S4 Lev 00 42 30.0 +40 53 46       20.62 20.62 ~ 9 0
4 [BAE2005] 2 1 Lev 00 42 30.51 +41 13 04.9       19.07 18.36 ~ 12 0
5 AGAPE Z1 Lev 00 42 41.47 +41 16 39.1           ~ 2 1
6 M 32 IG 00 42 41.825 +40 51 54.61 9.51 9.03 8.08     ~ 2034 2
7 PA 99-S7 Lev 00 42 42.56 +41 12 42.8           ~ 3 0
8 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11202 1
9 MEGA-ML 16 Lev 00 42 51.42 +41 23 53.7     22.00     ~ 13 0
10 MEGA-ML 13 Lev 00 43 02.49 +40 45 09.2           ~ 5 0
11 MEGA-ML 4 Lev 00 43 04.08 +41 26 15.6           ~ 4 0
12 MEGA-ML 10 Lev 00 43 54.87 +41 10 33.3           ~ 7 0
13 MEGA-ML 7 Lev 00 44 20.89 +41 28 44.6           ~ 13 1
14 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5857 1
15 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15197 1
16 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1242 0
17 NAME Galactic Bulge reg ~ ~           ~ 3531 0

    Equat.    Gal    SGal    Ecl

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2021.03.01-09:37:12

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