HST Survey of Clusters in Nearby Galaxies. I. Detection and Photometry

Details HST Survey of Clusters in Nearby Galaxies. I. Detection and Photometry HST Survey of Clusters in Nearby Galaxies. I. Detection and Photometry

2001-10-08

arxiv.org/abs/astro-ph/0110189v1

Astronomy and Astrophysics

Astrophysics

26 pages, 22 figures to appear in AJ

Scientific paper

10.1086/338097

We have developed photometric techniques that can be applied to images with highly-variable backgrounds, as well as to slightly-extended objects (object size comparable to or smaller than PSF size). We have shown that ordinary stellar PSF-fitting photometry can be applied to slightly-extended objects, provided that one applies a systematic correction to the photometry that is a function primarily of the observed sharpness. Applying these techniques to the Cepheid target NGC 3627, we find that we are successfully able to photometer the stars and clusters, as well as discriminating the cluster population with a negligible number of false detections.

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