A short-timescale candidate microlensing event in the point-agape pixel lensing survey of M31

M. Auriere; P. Baillon; A. Bouquet; B.J. Carr; M. Creze; N.W. Evans; Y. Giraud-Heraud; A. Gould; P.C. Hewett; J. Kaplan; E. Kerins; E. Lastennet; Y. Le Du; A.L. Melchior; S.P. Henriksson; Stephen Smartt; D. Valls-Gabaud

A short-timescale candidate microlensing event in the point-agape pixel lensing survey of M31

M. Auriere, P. Baillon, A. Bouquet, B.J. Carr, M. Creze, N.W. Evans, Y. Giraud-Heraud, A. Gould, P.C. Hewett, J. Kaplan, E. Kerins, E. Lastennet, Y. Le Du, A.L. Melchior, S.P. Henriksson, Stephen Smartt, D. Valls-Gabaud

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Abstract

We report the discovery of a short-duration microlensing candidate in the northern field of the POINT-AGAPE pixel lensing survey toward M31. Almost certainly, the source star has been identified on Hubble Space Telescope archival images, allowing us to infer an Einstein crossing time of t(E) = 10.4 days, a maximum magnification of A(max) similar to 18, and a lens-source proper motion mu (rel) > 0.3 mu as day(-1). The event has a projected separation of 8' from the center of M31, beyond the bulk of the stellar lens population. There are three plausible identifications/locations for the lensing object: a massive compact halo object (MACHO) in either M31 or the Milky Way, or a star in the M31 disk. The most probable mass is 0.06 M-. for an M31 MACHO, 0.02 M-. for a Milky Way MACHO, and 0.2 M-. for an M31 stellar lens. While the stellar interpretation is possible, the MACHO interpretation is the most probable for halo fractions above 20%.

Original language	English
Pages (from-to)	L137-L140
Number of pages	4
Journal	Astrophysical Journal
Volume	553
Issue number	2 PART 2
Publication status	Published - 01 Jun 2001

ASJC Scopus subject areas

Space and Planetary Science

Cite this

Auriere, M., Baillon, P., Bouquet, A., Carr, B. J., Creze, M., Evans, N. W., Giraud-Heraud, Y., Gould, A., Hewett, P. C., Kaplan, J., Kerins, E., Lastennet, E., Le Du, Y., Melchior, A. L., Henriksson, S. P., Smartt, S., & Valls-Gabaud, D. (2001). A short-timescale candidate microlensing event in the point-agape pixel lensing survey of M31. Astrophysical Journal, 553(2 PART 2), L137-L140.

@article{48dbffa18c914526b8b3f3455d661f24,

title = "A short-timescale candidate microlensing event in the point-agape pixel lensing survey of M31",

abstract = "We report the discovery of a short-duration microlensing candidate in the northern field of the POINT-AGAPE pixel lensing survey toward M31. Almost certainly, the source star has been identified on Hubble Space Telescope archival images, allowing us to infer an Einstein crossing time of t(E) = 10.4 days, a maximum magnification of A(max) similar to 18, and a lens-source proper motion mu (rel) > 0.3 mu as day(-1). The event has a projected separation of 8' from the center of M31, beyond the bulk of the stellar lens population. There are three plausible identifications/locations for the lensing object: a massive compact halo object (MACHO) in either M31 or the Milky Way, or a star in the M31 disk. The most probable mass is 0.06 M-. for an M31 MACHO, 0.02 M-. for a Milky Way MACHO, and 0.2 M-. for an M31 stellar lens. While the stellar interpretation is possible, the MACHO interpretation is the most probable for halo fractions above 20%.",

author = "M. Auriere and P. Baillon and A. Bouquet and B.J. Carr and M. Creze and N.W. Evans and Y. Giraud-Heraud and A. Gould and P.C. Hewett and J. Kaplan and E. Kerins and E. Lastennet and {Le Du}, Y. and A.L. Melchior and S.P. Henriksson and Stephen Smartt and D. Valls-Gabaud",

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language = "English",

volume = "553",

pages = "L137--L140",

journal = "Astrophysical Journal",

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Auriere, M, Baillon, P, Bouquet, A, Carr, BJ, Creze, M, Evans, NW, Giraud-Heraud, Y, Gould, A, Hewett, PC, Kaplan, J, Kerins, E, Lastennet, E, Le Du, Y, Melchior, AL, Henriksson, SP, Smartt, S & Valls-Gabaud, D 2001, 'A short-timescale candidate microlensing event in the point-agape pixel lensing survey of M31', Astrophysical Journal, vol. 553, no. 2 PART 2, pp. L137-L140.

TY - JOUR

T1 - A short-timescale candidate microlensing event in the point-agape pixel lensing survey of M31

AU - Auriere, M.

AU - Baillon, P.

AU - Bouquet, A.

AU - Carr, B.J.

AU - Creze, M.

AU - Evans, N.W.

AU - Giraud-Heraud, Y.

AU - Gould, A.

AU - Hewett, P.C.

AU - Kaplan, J.

AU - Kerins, E.

AU - Lastennet, E.

AU - Le Du, Y.

AU - Melchior, A.L.

AU - Henriksson, S.P.

AU - Smartt, Stephen

AU - Valls-Gabaud, D.

PY - 2001/6/1

Y1 - 2001/6/1

N2 - We report the discovery of a short-duration microlensing candidate in the northern field of the POINT-AGAPE pixel lensing survey toward M31. Almost certainly, the source star has been identified on Hubble Space Telescope archival images, allowing us to infer an Einstein crossing time of t(E) = 10.4 days, a maximum magnification of A(max) similar to 18, and a lens-source proper motion mu (rel) > 0.3 mu as day(-1). The event has a projected separation of 8' from the center of M31, beyond the bulk of the stellar lens population. There are three plausible identifications/locations for the lensing object: a massive compact halo object (MACHO) in either M31 or the Milky Way, or a star in the M31 disk. The most probable mass is 0.06 M-. for an M31 MACHO, 0.02 M-. for a Milky Way MACHO, and 0.2 M-. for an M31 stellar lens. While the stellar interpretation is possible, the MACHO interpretation is the most probable for halo fractions above 20%.

AB - We report the discovery of a short-duration microlensing candidate in the northern field of the POINT-AGAPE pixel lensing survey toward M31. Almost certainly, the source star has been identified on Hubble Space Telescope archival images, allowing us to infer an Einstein crossing time of t(E) = 10.4 days, a maximum magnification of A(max) similar to 18, and a lens-source proper motion mu (rel) > 0.3 mu as day(-1). The event has a projected separation of 8' from the center of M31, beyond the bulk of the stellar lens population. There are three plausible identifications/locations for the lensing object: a massive compact halo object (MACHO) in either M31 or the Milky Way, or a star in the M31 disk. The most probable mass is 0.06 M-. for an M31 MACHO, 0.02 M-. for a Milky Way MACHO, and 0.2 M-. for an M31 stellar lens. While the stellar interpretation is possible, the MACHO interpretation is the most probable for halo fractions above 20%.

M3 - Article

VL - 553

SP - L137-L140

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 PART 2

ER -

A short-timescale candidate microlensing event in the point-agape pixel lensing survey of M31

Abstract

ASJC Scopus subject areas

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