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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 421299.0, MPI für Astronomie / Publikationen_mpia
Ground-based variability surveys towards Centaurus A: worthwhile or not?
Authors:de Jong, J. T. A.; Kuijken, K. H.; Héraudeau, P.
Date of Publication (YYYY-MM-DD):2008
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:A&A
Start Page:755
End Page:762
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Context: Difference imaging has proven to be a powerful technique for detecting and monitoring the variability of unresolved stellar sources in M 31. Using this technique in surveys of galaxies outside the Local Group could have many interesting applications. Aims: The goal of this paper is to test difference imaging photometry on Centaurus A, the nearest giant elliptical galaxy, at a distance of 4 Mpc. Methods: We obtained deep photometric data with the Wide Field Imager at the ESO/MPG 2.2 m at La Silla spread over almost two months. Applying the difference imaging photometry package DIFIMPHOT, we produced high-quality difference images and detected variable sources. The sensitivity of the current observational setup was determined through artificial residual tests. Results: In the resulting high-quality difference images, we detect 271 variable stars. We find a difference flux detection limit corresponding to mR ~= 24.5. Based on a simple model of the halo of Centaurus A, we estimate that a ground-based microlensing survey would detect in the order of 4 microlensing events per year due to lenses in the halo. Conclusions: Difference imaging photometry works very well at the distance of Centaurus A and promises to be a useful tool for detecting and studying variable stars in galaxies outside the local group. For microlensing surveys, a higher sensitivity is needed than achieved here, which would be possible with a large ground-based telescope or space observatory with wide-field imaging capabilities. Catalogue is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr ( or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/478/755
Free Keywords:galaxies: individual: Centaurus A; galaxies: stellar; content; stars: variables: general; gravitational lensing
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2008A%26A...478..755... [ID No:1]
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