A Short Timescale Candidate Microlensing Event in the POINT-AGAPE Pixel Lensing Survey of M31

We report the discovery of a short-duration microlensing candidate in the northern field of the POINT-AGAPE pixel lensing survey towards M31. The full-width half-maximum timescale is very short, just 1.8 days. Almost certainly, the source star has been identified on Hubble Space Telescope archival i...

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Detalles Bibliográficos
Autores principales: Auriere, M., Baillon, P., Bouquet, A., Carr, Bernard J., Creze, M., Evans, N.W., Giraud-Heraud, Y., Gould, A., Hewett, Paul C., Kaplan, J., Kerins, E., Lastennet, E., Du, Y.Le, Melchior, A.L., Paulin-Henriksson, S., Smartt, S.J., Valls-Gabaud, D.
Lenguaje:eng
Publicado: 2001
Materias:
Astrophysics and Astronomy
Acceso en línea:https://dx.doi.org/10.1086/320681
http://cds.cern.ch/record/486047
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author Auriere, M.
Baillon, P.
Bouquet, A.
Carr, Bernard J.
Creze, M.
Evans, N.W.
Giraud-Heraud, Y.
Gould, A.
Hewett, Paul C.
Kaplan, J.
Kerins, E.
Lastennet, E.
Du, Y.Le
Melchior, A.L.
Paulin-Henriksson, S.
Smartt, S.J.
Valls-Gabaud, D.
author_facet Auriere, M.
Baillon, P.
Bouquet, A.
Carr, Bernard J.
Creze, M.
Evans, N.W.
Giraud-Heraud, Y.
Gould, A.
Hewett, Paul C.
Kaplan, J.
Kerins, E.
Lastennet, E.
Du, Y.Le
Melchior, A.L.
Paulin-Henriksson, S.
Smartt, S.J.
Valls-Gabaud, D.
author_sort Auriere, M.
collection CERN
description We report the discovery of a short-duration microlensing candidate in the northern field of the POINT-AGAPE pixel lensing survey towards M31. The full-width half-maximum timescale is very short, just 1.8 days. Almost certainly, the source star has been identified on Hubble Space Telescope archival images, allowing us to infer an Einstein crossing time of 10.4 days, a maximum magnification of about 18, and a lens-source proper motion greater than 0.3 microarcsec/day. The event lies projected at 8' from the center of M31, which is beyond the bulk of the stellar lens population. The lens is likely to reside in one of three locations. It may be a star in the M31 disk, or a massive compact halo object (Macho) in either M31 or the Milky Way. The most probable mass is 0.06 solar masses for an M31 Macho, 0.02 solar masses for a Milky Way Macho and 0.2 solar masses for an M31 stellar lens. Whilst the stellar interpretation is plausible, the Macho interpretation is the most probable for halo fractions above 20%.
id cern-486047
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2001
record_format invenio
spelling cern-4860472021-09-17T12:49:44Zdoi:10.1086/320681http://cds.cern.ch/record/486047engAuriere, M.Baillon, P.Bouquet, A.Carr, Bernard J.Creze, M.Evans, N.W.Giraud-Heraud, Y.Gould, A.Hewett, Paul C.Kaplan, J.Kerins, E.Lastennet, E.Du, Y.LeMelchior, A.L.Paulin-Henriksson, S.Smartt, S.J.Valls-Gabaud, D.A Short Timescale Candidate Microlensing Event in the POINT-AGAPE Pixel Lensing Survey of M31Astrophysics and AstronomyWe report the discovery of a short-duration microlensing candidate in the northern field of the POINT-AGAPE pixel lensing survey towards M31. The full-width half-maximum timescale is very short, just 1.8 days. Almost certainly, the source star has been identified on Hubble Space Telescope archival images, allowing us to infer an Einstein crossing time of 10.4 days, a maximum magnification of about 18, and a lens-source proper motion greater than 0.3 microarcsec/day. The event lies projected at 8' from the center of M31, which is beyond the bulk of the stellar lens population. The lens is likely to reside in one of three locations. It may be a star in the M31 disk, or a massive compact halo object (Macho) in either M31 or the Milky Way. The most probable mass is 0.06 solar masses for an M31 Macho, 0.02 solar masses for a Milky Way Macho and 0.2 solar masses for an M31 stellar lens. Whilst the stellar interpretation is plausible, the Macho interpretation is the most probable for halo fractions above 20%.We report the discovery of a short-duration microlensing candidate in the northern field of the POINT-AGAPE pixel lensing survey towards M31. The full-width half-maximum timescale is very short, just 1.8 days. Almost certainly, the source star has been identified on Hubble Space Telescope archival images, allowing us to infer an Einstein crossing time of 10.4 days, a maximum magnification of about 18, and a lens-source proper motion greater than 0.3 microarcsec/day. The event lies projected at 8' from the center of M31, which is beyond the bulk of the stellar lens population. The lens is likely to reside in one of three locations. It may be a star in the M31 disk, or a massive compact halo object (Macho) in either M31 or the Milky Way. The most probable mass is 0.06 solar masses for an M31 Macho, 0.02 solar masses for a Milky Way Macho and 0.2 solar masses for an M31 stellar lens. Whilst the stellar interpretation is plausible, the Macho interpretation is the most probable for halo fractions above 20%.astro-ph/0102080oai:cds.cern.ch:4860472001-02-05
spellingShingle Astrophysics and Astronomy
Auriere, M.
Baillon, P.
Bouquet, A.
Carr, Bernard J.
Creze, M.
Evans, N.W.
Giraud-Heraud, Y.
Gould, A.
Hewett, Paul C.
Kaplan, J.
Kerins, E.
Lastennet, E.
Du, Y.Le
Melchior, A.L.
Paulin-Henriksson, S.
Smartt, S.J.
Valls-Gabaud, D.
A Short Timescale Candidate Microlensing Event in the POINT-AGAPE Pixel Lensing Survey of M31
title A Short Timescale Candidate Microlensing Event in the POINT-AGAPE Pixel Lensing Survey of M31
title_full A Short Timescale Candidate Microlensing Event in the POINT-AGAPE Pixel Lensing Survey of M31
title_fullStr A Short Timescale Candidate Microlensing Event in the POINT-AGAPE Pixel Lensing Survey of M31
title_full_unstemmed A Short Timescale Candidate Microlensing Event in the POINT-AGAPE Pixel Lensing Survey of M31
title_short A Short Timescale Candidate Microlensing Event in the POINT-AGAPE Pixel Lensing Survey of M31
title_sort short timescale candidate microlensing event in the point-agape pixel lensing survey of m31
topic Astrophysics and Astronomy
url https://dx.doi.org/10.1086/320681
http://cds.cern.ch/record/486047
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