Difference image analysis of galactic microlensing. II. Microlensing events

被引：27

作者：

Alcock, C ^{[1
]}

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

机构：

[1] Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[2] Univ Calif Berkeley, Ctr Particle Astrophys, Berkeley, CA 94720 USA

[3] Australian Natl Univ, Supercomp Facil, Canberra, ACT 0200, Australia

[4] Univ Calif Berkeley, Dept Phys, Berkeley, CA 95616 USA

[5] Mt Stromlo & Siding Spring Observ, Canberra, ACT 2611, Australia

[6] Univ Washington, Dept Phys & Astron, Seattle, WA 98195 USA

[7] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[8] Univ Sheffield, Dept Phys, Sheffield S3 7RH, S Yorkshire, England

[9] Pontificia Univ Catolica Chile, Dept Astron, Santiago 22, Chile

[10] MIT, Ctr Space Res, Cambridge, MA 02139 USA

[11] European So Observ, D-85748 Garching, Germany

[12] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

[13] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 1999年 / 124卷 / 01期

基金：

美国国家科学基金会;

关键词：

atmospheric effects; Galaxy : stellar content; gravitational lensing; techniques : image processing;

D O I：

10.1086/313258

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：171 / 179

页数：9

共 18 条

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