WeCAPP - The Wendelstein Calar Alto Pixellensing Project I Tracing Dark and Bright Matter in M31

Abstract

We present WeCAPP, a long term monitoring project searching for microlensing events towards M 31. Since 1997 the bulge of M 31 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 M 31. 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.

arXiv comment10 pages, 21 figures, published in Astronomy & Astrophysics (2001)

References in corpus (25)

• A method for optimal image subtraction
• The MACHO Project: Microlensing Results from 5.7 Years of LMC Observations
• Possible Gravitational Microlensing of a Star in the Large Magellanic Cloud
• A standard stellar library for evolutionary synthesis: II. The M dwarf extension
• The MACHO Project LMC Microlensing Results from the First Two Years and the Nature of the Galactic Dark Halo
• Expanding the Realm of Microlensing Surveys with Difference Image Photometry
• The MACHO project: Microlensing Optical Depth towards the Galactic Bulge from Difference Image Analysis
• Hubble Space Telescope Observations of M32: The Color-Magnitude Diagram
• Theory of Pixel Lensing
• Are the Ogle Microlenses in the Galactic Bar?
• Microlensing of Blended Stellar Images
• Results from a Survey of Gravitational Microlensing towards M31
• A Short Timescale Candidate Microlensing Event in the POINT-AGAPE Pixel Lensing Survey of M31
• Macho Proper Motions From Optical/Infrared Photometry
• WeCAPP - The Wendelstein Calar Alto Pixellensing Project I Tracing Dark and Bright Matter in M31
• Is the Large Magellanic Cloud a Large Microlensing Cloud?
• The Effects of Amplification Bias in Gravitational Microlensing Experiments
• Optical depth evaluation in pixel microlensing
• Event Rate and Einstein Time Evaluation in Pixel Microlensing
• Pixel Lensing Experiment toward the M31 Bulge
• Chromaticity of Gravitational Microlensing Events
• Galactic versus Extragalactic Pixel Lensing Events toward M31
• Using Astrometry to Deblend Microlensing Events
• Colour Change Measurements of Gravitational Microlensing Events by Using the Difference Image Analysis Method
• Unbiased reconstruction of the mass function using microlensing survey data

Cited by in corpus (30)

• X-ray monitoring of optical novae in M31 from July 2004 to February 2005
• Optical novae: the major class of supersoft X-ray sources in M 31
• The FORS Deep Field: Field selection, photometric observations and photometric catalog
• Image reduction pipeline for the detection of variable sources in highly crowded fields
• X-ray monitoring of classical novae in the central region of M 31. II. Autumn and winter 2007/2008 and 2008/2009
• First Microlensing Events From The MEGA Survey Of M31
• The Wendelstein Calar Alto Pixellensing Project(WeCAPP): First MACHO Candidates
• Lightcurve Classification in Massive Variability Surveys
• Microlensing search towards M31
• X-ray monitoring of classical novae in the central region of M 31. I. June 2006 - March 2007
• The POINT-AGAPE Survey I: The Variable Stars in M31
• Variability of Red Supergiants in M31 from the Palomar Transient Factory
• WeCAPP - The Wendelstein Calar Alto Pixellensing Project I Tracing Dark and Bright Matter in M31
• PAndromeda - first results from the high-cadence monitoring of M31 with Pan-STARRS 1
• M31 pixel lensing event OAB-N2: a study of the lens proper motion
• Pixel lensing: Microlensing towards M31
• The impact of spheroid stars for Macho microlensing surveys of the Andromeda Galaxy
• The Wendelstein Calar Alto Pixellensing Project (WeCAPP): The M31 Variable Star Catalogue
• X-ray emission from optical novae in M 31
• Microlensing toward crowded fields: Theory and applications to M31
• Microlensing towards M31 with MDM data
• The possibility of detecting planets in the Andromeda Galaxy
• Variable stars towards the bulge of M31: the AGAPE catalogue
• Cluster-Cluster Microlensing as a Probe of Intracluster Stars, MACHOs, and Remnants of the First Generation Stars
• Novae in Globular Clusters
• The Wendelstein Calar Alto Pixellensing Project (WeCAPP): the M31 Nova catalogue
• Constraining the role of novae as progenitors of Type Ia Supernovae
• Nainital Microlensing Survey -- detection of short period Cepheids in the disk of M31
• M31 Pixel Lensing PLAN Campaign: MACHO Lensing and Self Lensing Signals
• Theory of pixel lensing towards M31 -- II. The velocity anisotropy and flattening of the MACHO distribution