Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-09-20
Astrophys.Space Sci.284:647-650,2003
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures, proceedings of the 3rd Euroconference "Evolution of Galaxies", Kiel 2002
Scientific paper
10.1023/A:1024086829202
We are investigating the hypothesis that Compact High--Velocity Clouds (CHVCs) are the left-over building blocks of Local Group galaxies. To this end, we are searching for their embedded stellar populations using FORS at the VLT. The search is done with single-star photometry in V and I bands, which is sensitive to both, young and old, stellar populations. Five CHVCs of our sample have been observed so far down to I=24. We pointed the VLT towards the highest HI column density regions, as determined in Effelsberg radio data. In an alternate approach, we searched 2MASS public data towards those 5 CHVCs down to K=16. While the VLT data probe the central regions out to distance moduli of about 27, the 2MASS data are sensitive to a population of red giant stars to distance moduli of about 20. The 2MASS data, on the other hand, cover a much wider field of view than the VLT data (radius of 1 degree versus FORS field of 6.8 arcmin). We did not find a stellar population intrinsic to the CHVCs in either data. In this paper, we illustrate our search methods.
Hopp Ulrich
Kerp Juergen
Schulte-Ladbeck Regina E.
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