Journal article

Deep hubble space telescope observations of star clusters in NGC 1275

MN Carlson, JA Holtzman, AM Watson, CJ Grillmair, JR Mould, GE Ballester, CJ Burrows, JT Clarke, D Crisp, RW Evans, JS Gallagher, RE Griffiths, JJ Hester, JG Hoessel, PA Scowen, KR Stapelfeldt, JT Trauger, JA Westphal

Astronomical Journal | Published : 1998


We present an analysis of compact star clusters in deep Hubble Space Telescope Wide Field Planetary Camera 2 images of NGC 1275. B- and R-band photometry of roughly 3000 clusters shows a bimodality in the B - R colors, suggesting that distinct old and young cluster populations are present. The small spread in the colors of the blue clusters is consistent with the hypothesis that they are a single-age population, with an inferred age of 0.1 to 1 Gyr. The luminosity function shows increasing numbers of blue clusters to the limit of our photometry, which reaches several magnitudes past the turnover predicted if the cluster population is identical to current Galactic globular clusters seen at a ..

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