2006A&A...445..375I


Query : 2006A&A...445..375I

2006A&A...445..375I - Astronomy and Astrophysics, volume 445, 375-385 (2006/1-2)

Monte Carlo analysis of MEGA microlensing events towards M31.

INGROSSO G., CALCHI NOVATI S., DE PAOLIS F., JETZER P., NUCITA A.A. and STRAFELLA F.

Abstract (from CDS):

We perform an analytical study and a Monte Carlo (MC) analysis of the main features for microlensing events in pixel lensing observations towards M31. Our main aim is to investigate the lens nature and location of the 14 candidate events found by the MEGA collaboration. Assuming a reference model for the mass distribution in M31 and the standard model for our galaxy, we estimate the MACHO-to-self lensing probability and the event time duration towards M31. Reproducing the MEGA observing conditions, as a result we get the MC event number density distribution as a function of the event full-width half-maximum duration t1/2 and the magnitude at maximum Rmax. For a MACHO mass of 0.5M we find typical values of t1/2≃20 day and Rmax≃22, for both MACHO-lensing and self-lensing events occurring beyond about 10 arcmin from the M31 center. A comparison of the observed features (t1/2 and Rmax) with our MC results shows that for a MACHO mass >0.1M the four innermost MEGA events are most likely self-lensing events, whereas the six outermost events must be genuine MACHO-lensing events.

Abstract Copyright:

Journal keyword(s): gravitational lensing - galaxy: halo - galaxies: individuals: M31

Simbad objects: 18

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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 - 2022
#notes
1 MEGA-ML 12 Lev 00 41 26.90 +40 49 42.1           ~ 5 0
2 PA 00-S4 Lev 00 42 30.0 +40 53 46       20.62 20.62 ~ 9 0
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11941 1
4 MEGA-ML 13 Lev 00 43 02.49 +40 45 09.2           ~ 5 0
5 MEGA-ML 4 Lev 00 43 04.08 +41 26 15.6           ~ 4 0
6 MEGA-ML 1 Lev 00 43 10.54 +41 17 47.8           ~ 4 0
7 MEGA-ML 2 Lev 00 43 11.95 +41 17 43.6           ~ 4 0
8 MEGA-ML 3 Lev 00 43 15.76 +41 20 52.2           ~ 5 0
9 MEGA-ML 8 Lev 00 43 24.53 +41 37 50.4           ~ 5 0
10 MEGA-ML 14 Lev 00 43 42.53 +40 42 33.9           ~ 4 0
11 MEGA-ML 10 Lev 00 43 54.87 +41 10 33.3           ~ 7 0
12 MEGA-ML 7 Lev 00 44 20.89 +41 28 44.6           ~ 13 1
13 MEGA-ML 9 Lev 00 44 46.80 +41 41 06.7           ~ 4 0
14 MEGA-ML 5 Lev 00 44 48.95 +41 22 59.3           ~ 4 0
15 MEGA-ML 6 Lev 00 44 50.97 +41 24 42.4           ~ 3 0
16 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6418 1
17 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6738 3
18 NAME Galactic Bulge reg ~ ~           ~ 3930 0

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2022.10.01-12:23:32

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