WeCAPP -: Wendelstein Calar Alto pixellensing project I -: Tracing dark and bright matter in M31

被引：43

作者：

Riffeser, A ^{[1
]}

Fliri, J ^{[1
]}

Gössl, CA ^{[1
]}

Bender, R ^{[1
]}

Hopp, U ^{[1
]}

Bärnbantner, O ^{[1
]}

Ries, C ^{[1
]}

Barwig, H ^{[1
]}

Seitz, S ^{[1
]}

Mitsch, W ^{[1
]}

机构：

[1] Univ Sternwarte Munchen, D-81679 Munich, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2001年 / 379卷 / 02期

关键词：

cosmology : observations; dark matter; Galaxy : halo; galaxies : halos; galaxies : individual : M31; gravitational lensing;

D O I：

10.1051/0004-6361:20011288

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present WeCAPP, a long term monitoring project searching for microlensing events towards M31. Since 1997 the bulge of M31 was monitored in two different wavebands with the Wendelstein 0.8 m telescope. In 1999 we extended our observations to the Calar Alto 1.23 m telescope. Observing simultaneously at these two sites we obtained a time coverage of 53% during the observability of M31. To check thousands of frames for variability of unresolved sources, we used the optimal image subtraction method (OIS) by Alard & Lupton (1998). This enabled us to minimize the residuals in the difference image analysis (DIA) and to detect variable sources with amplitudes at the photon noise level. Thus we can detect microlensing events with corresponding amplifications A >10 of red clump giants with M-I = 0.

引用

页码：362 / 373

页数：12

共 52 条

[31] Chromaticity of gravitational microlensing events [J].