SIMBAD references

2004A&A...417..461D - Astronomy and Astrophysics, volume 417, 461-477 (2004/4-2)

First microlensing candidates from the MEGA survey of M 31.

DE JONG J.T.A., KUIJKEN K., CROTTS A.P.S., SACKETT P.D., SUTHERLAND W.J., UGLESICH R.R., BALTZ E.A., CSERESNJES P., GYUK G. and WIDROW L.M.

Abstract (from CDS):

We present the first M 31 candidate microlensing events from the Microlensing Exploration of the Galaxy and Andromeda (MEGA) survey. MEGA uses several telescopes to detect microlensing towards the nearby Andromeda galaxy, M 31, in order to establish whether massive compact objects are a significant contribution to the mass budget of the dark halo of M 31. The results presented here are based on observations with the Isaac Newton Telescope on La Palma, during the 1999/00 and 2000/01 observing seasons. In this data set, 14 variable sources consistent with microlensing have been detected, 12 of which are new and 2 have been reported previously by the POINT-AGAPE group. A preliminary analysis of the spatial and timescale distributions of the candidate events support their microlensing nature. We compare the spatial distributions of the candidate events and of long-period variable stars, assuming the chances of finding a long-period variable and a microlensing event are comparable. The spatial distribution of our candidate microlensing events is more far/near side asymmetric than expected from the detected long-period variable distribution. The current analysis is preliminary and the asymmetry not highly significant, but the spatial distribution of candidate microlenses is suggestive of the presence of a microlensing halo.

Abstract Copyright:

Journal keyword(s): gravitational lensing - M 31 : halo - dark matter

Nomenclature: Table 2: MEGA-ML NN (Nos 1-14).

Simbad objects: 17

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