Difference image analysis of galactic microlensing. II. Microlensing events

C. Alcock; R. A. Allsman; D. Alves; T. S. Axelrod; A. C. Becker; D. P. Bennett; K. H. Cook; A. J. Drake; K. C. Freeman; K. Griest; M. J. Lehner; S. L. Marshall; D. Minniti; B. A. Peterson; M. R. Pratt; P. J. Quinn; C. W. Stubbs; W. Sutherland; A. Tomaney; T. Vandehei; D. L. Welch

doi:10.1086/313258

Difference image analysis of galactic microlensing. II. Microlensing events

C. Alcock^*, R. A. Allsman, D. Alves, T. S. Axelrod, A. C. Becker, D. P. Bennett, K. H. Cook, A. J. Drake, K. C. Freeman, K. Griest, M. J. Lehner, S. L. Marshall, D. Minniti, B. A. Peterson, M. R. Pratt, P. J. Quinn, C. W. Stubbs, W. Sutherland, A. Tomaney, T. VandeheiD. L. Welch

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

The MACHO collaboration has been carrying out difference image analysis (DIA) since 1996 with the aim of increasing the sensitivity to the detection of gravitational microlensing. This is a preliminary report on the application of DIA to galactic bulge images in one field. We show how the DIA technique significantly increases the number of detected lensing events, by removing the positional dependence of traditional photometry schemes and lowering the microlensing event detection threshold. This technique, unlike PSF photometry, gives the unblended colors and positions of the microlensing source stars. We present a set of criteria for selecting microlensing events from objects discovered with this technique. The 16 pixel and classical microlensing events discovered with the DIA technique are presented.

Original language	English
Pages (from-to)	171-179
Number of pages	9
Journal	Astrophysical Journal, Supplement Series
Volume	124
Issue number	1
DOIs	https://doi.org/10.1086/313258
Publication status	Published - Sept 1999

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Alcock, C., Allsman, R. A., Alves, D., Axelrod, T. S., Becker, A. C., Bennett, D. P., Cook, K. H., Drake, A. J., Freeman, K. C., Griest, K., Lehner, M. J., Marshall, S. L., Minniti, D., Peterson, B. A., Pratt, M. R., Quinn, P. J., Stubbs, C. W., Sutherland, W., Tomaney, A., ... Welch, D. L. (1999). Difference image analysis of galactic microlensing. II. Microlensing events. Astrophysical Journal, Supplement Series, 124(1), 171-179. https://doi.org/10.1086/313258

@article{132bd389dc144248982bd1889f877f27,

title = "Difference image analysis of galactic microlensing. II. Microlensing events",

abstract = "The MACHO collaboration has been carrying out difference image analysis (DIA) since 1996 with the aim of increasing the sensitivity to the detection of gravitational microlensing. This is a preliminary report on the application of DIA to galactic bulge images in one field. We show how the DIA technique significantly increases the number of detected lensing events, by removing the positional dependence of traditional photometry schemes and lowering the microlensing event detection threshold. This technique, unlike PSF photometry, gives the unblended colors and positions of the microlensing source stars. We present a set of criteria for selecting microlensing events from objects discovered with this technique. The 16 pixel and classical microlensing events discovered with the DIA technique are presented.",

keywords = "Atmospheric effects, Galaxy: stellar content, Gravitational lensing, Techniques: image processing",

author = "C. Alcock and Allsman, {R. A.} and D. Alves and Axelrod, {T. S.} and Becker, {A. C.} and Bennett, {D. P.} and Cook, {K. H.} and Drake, {A. J.} and Freeman, {K. C.} and K. Griest and Lehner, {M. J.} and Marshall, {S. L.} and D. Minniti and Peterson, {B. A.} and Pratt, {M. R.} and Quinn, {P. J.} and Stubbs, {C. W.} and W. Sutherland and A. Tomaney and T. Vandehei and Welch, {D. L.}",

year = "1999",

month = sep,

doi = "10.1086/313258",

language = "English",

volume = "124",

pages = "171--179",

journal = "Astrophysical Journal, Supplement Series",

issn = "0067-0049",

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Alcock, C, Allsman, RA, Alves, D, Axelrod, TS, Becker, AC, Bennett, DP, Cook, KH, Drake, AJ, Freeman, KC, Griest, K, Lehner, MJ, Marshall, SL, Minniti, D, Peterson, BA, Pratt, MR, Quinn, PJ, Stubbs, CW, Sutherland, W, Tomaney, A, Vandehei, T & Welch, DL 1999, 'Difference image analysis of galactic microlensing. II. Microlensing events', Astrophysical Journal, Supplement Series, vol. 124, no. 1, pp. 171-179. https://doi.org/10.1086/313258

TY - JOUR

T1 - Difference image analysis of galactic microlensing. II. Microlensing events

AU - Alcock, C.

AU - Allsman, R. A.

AU - Alves, D.

AU - Axelrod, T. S.

AU - Becker, A. C.

AU - Bennett, D. P.

AU - Cook, K. H.

AU - Drake, A. J.

AU - Freeman, K. C.

AU - Griest, K.

AU - Lehner, M. J.

AU - Marshall, S. L.

AU - Minniti, D.

AU - Peterson, B. A.

AU - Pratt, M. R.

AU - Quinn, P. J.

AU - Stubbs, C. W.

AU - Sutherland, W.

AU - Tomaney, A.

AU - Vandehei, T.

AU - Welch, D. L.

PY - 1999/9

Y1 - 1999/9

N2 - The MACHO collaboration has been carrying out difference image analysis (DIA) since 1996 with the aim of increasing the sensitivity to the detection of gravitational microlensing. This is a preliminary report on the application of DIA to galactic bulge images in one field. We show how the DIA technique significantly increases the number of detected lensing events, by removing the positional dependence of traditional photometry schemes and lowering the microlensing event detection threshold. This technique, unlike PSF photometry, gives the unblended colors and positions of the microlensing source stars. We present a set of criteria for selecting microlensing events from objects discovered with this technique. The 16 pixel and classical microlensing events discovered with the DIA technique are presented.

AB - The MACHO collaboration has been carrying out difference image analysis (DIA) since 1996 with the aim of increasing the sensitivity to the detection of gravitational microlensing. This is a preliminary report on the application of DIA to galactic bulge images in one field. We show how the DIA technique significantly increases the number of detected lensing events, by removing the positional dependence of traditional photometry schemes and lowering the microlensing event detection threshold. This technique, unlike PSF photometry, gives the unblended colors and positions of the microlensing source stars. We present a set of criteria for selecting microlensing events from objects discovered with this technique. The 16 pixel and classical microlensing events discovered with the DIA technique are presented.

KW - Atmospheric effects

KW - Galaxy: stellar content

KW - Gravitational lensing

KW - Techniques: image processing

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U2 - 10.1086/313258

DO - 10.1086/313258

M3 - Article

SN - 0067-0049

VL - 124

SP - 171

EP - 179

JO - Astrophysical Journal, Supplement Series

JF - Astrophysical Journal, Supplement Series

IS - 1

ER -

Difference image analysis of galactic microlensing. II. Microlensing events

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