HST-ACS photometry of the isolated dwarf galaxy VV124=UGC4879. Detection of the Blue Horizontal Branch and identification of two young star clusters

Details HST-ACS photometry of the isolated dwarf galaxy VV124=UGC4879. Detection of the Blue Horizontal Branch and identification of two young star clusters HST-ACS photometry of the isolated dwarf galaxy VV124=UGC4879. Detection of the Blue Horizontal Branch and identification of two young star clusters

2011-07-13

arxiv.org/abs/1107.2556v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted for publication by Astronomy & Astrophysics. 11 pages, 10 color figures. Four figures are provided in low resolution

Scientific paper

We present deep V and I photometry of the isolated dwarf galaxy VV124=UGC4879, obtained from archival images taken with the Hubble Space Telescope - Advanced Camera for Surveys. In the color-magnitude diagrams of stars at distances larger than 40" from the center of the galaxy, we clearly identify for the first time a well-populated old Horizontal Branch (HB). We show that the distribution of these stars is more extended than that of Red Clump stars. This implies that very old and metal poor populations becomes more and more dominant in the outskirts of VV124. We also identify a massive (M~1.2X10^4 M_sun) young (age ~250 Myr) star cluster (C1), as well as another of younger age (C2, <= 30 Myr) with a mass similar to classical open clusters (M<= 3.3X10^3 M_sun). Both clusters lie at projected distances smaller than 100 pc from the center of the galaxy.

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