2002A&A...393..129J


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.12CEST13:04:59

2002A&A...393..129J - Astronomy and Astrophysics, volume 393, 129-147 (2002/10-1)

Microlensing towards the Large Magellanic Cloud.

JETZER P., MANCINI L. and SCARPETTA G.

Abstract (from CDS):

The nature and the location of the lenses discovered in the microlensing surveys done so far towards the LMC remain unclear. Motivated by these questions we compute the optical depth and particularly the number of expected events for self-lensing for both the MACHO and EROS2 observations. We calculate these quantities also for other possible lens populations such as thin and thick disk and galactic spheroid. Moreover, we estimate for each of these components the corresponding average event duration and mean mass using the mass moment method. By comparing the theoretical quantities with the values of the observed events it is possible to put some constraints on the location and the nature of the MACHOs. Clearly, given the large uncertainties and the few events at disposal it is not possible to draw sharp conclusions, nevertheless we find that certainly at least 3-4 MACHO events are due to lenses in LMC, which are most probably low mass stars, but that hardly all events can be due to self-lensing. This conclusions is even stronger when considering the EROS2 events, due to their spatial distribution. The most plausible solution is that the events observed so far are due to lenses belonging to different intervening populations: low mass stars in the LMC, in the thick disk, in the spheroid and possibly some true MACHOs in the halo.

Abstract Copyright:

Journal keyword(s): gravitational lensing - cosmology: dark matter - stars: white dwarfs - Galaxy: halo - galaxies: Magellanic Clouds

Simbad objects: 19

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Number of rows : 19

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9446 1
2 MACHO LMC 20 Lev 04 54 19 -70 02.2     21.35     ~ 13 0
3 MACHO LMC 21 Lev 04 57 14 -69 27.8     19.37     ~ 8 0
4 MACHO LMC 25 Lev 05 02 16 -68 00.9     19.04     ~ 10 0
5 MACHO LMC 7 Lev 05 04 03.3 -69 33 18     20.7     ~ 13 0
6 MACHO LMC 15 Lev 05 05 46 -69 43.8     21.03     ~ 8 0
7 MACHO LMC 23 V* 05 06 17 -70 58.8     20.27     ~ 12 0
8 MACHO LMC 27 Lev 05 06 35 -69 20.8     19.24     ~ 8 0
9 MACHO LMC 22 Lev 05 14 32 -71 09.2     20.64     ~ 9 0
10 MACHO LMC 1 Lev 05 14 44.4 -68 48 00           ~ 32 0
11 MACHO LMC 5 Lev 05 16 41.1 -70 29 18     21.15     ~ 60 1
12 MACHO LMC 4 Lev 05 17 14.6 -70 46 59     20.25     ~ 20 0
13 MACHO LMC 9 Lev 05 20 20.3 -69 15 12     19.58     ~ 43 0
14 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14832 1
15 MACHO LMC 13 Lev 05 24 03.2 -68 49 12     21.02     ~ 8 0
16 MACHO LMC 8 Lev 05 25 09.4 -69 47 54     20.31     ~ 13 0
17 MACHO LMC 6 Lev 05 26 14.0 -70 21 15     19.97     ~ 13 0
18 MACHO 96-LMC-2 Lev 05 34 44.3 -70 25 07     19.37     ~ 19 0
19 MACHO LMC 18 Lev 05 45 21 -71 09.2     19.55     ~ 11 0

    Equat.    Gal    SGal    Ecl

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2020.07.12-13:04:59

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