M31 Pixel Lensing Event OAB-N2: A Study of the Lens Proper Motion

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Abstract

We present an updated analysis of the M31 pixel lensing candidate event OAB-N2 previously reported by Calchi Novati et al. Here we take advantage of new data both astrometrical and photometrical. For astrometry: using archival 4 m KPNO and Hubble Space Telescope/WFPC2 data we perform a detailed analysis of the event source whose result, although not fully conclusive on the source magnitude determination, is confirmed by the following light curve photometry analysis. For photometry: first, unpublished WeCAPP data allow us to confirm OAB-N2, previously reported only as a viable candidate, as a well-constrained pixel lensing event. Second, this photometry enables a detailed analysis in the event parameter space including the effects due to a finite source size. The combined results of these analyses allow us to put a strong lower limit on the lens proper motion. This outcome favors the MACHO lensing hypothesis over self-lensing for this individual event and points the way toward distinguishing between the MACHO and self-lensing hypotheses from larger data sets.

Autore Pugliese

Tutti gli autori

  • Calchi Novati S. , Dall'Ora M. , Gould A. , Bozza V. , Bruni I. , De Paolis F. , Dominik M. , Gualandi R. , Ingrosso G. , Jetzer Ph. , Mancini L. , Nucita A. , Scarpetta G. , Sereno M. , Strafella F.

Titolo volume/Rivista

THE ASTROPHYSICAL JOURNAL

Anno di pubblicazione

2010

ISSN

0004-637X

ISBN

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Settori ERC

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Codici ASJC

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