SIMBAD references

2011A&A...533A..37B - Astronomy and Astrophysics, volume 533A, 37-37 (2011/9-1)

HST-ACS photometry of the isolated dwarf galaxy VV124=UGC 4879. Detection of the blue horizontal branch and identification of two young star clusters.

BELLAZZINI M., PERINA S., GALLETI S. and OOSTERLOO T.

Abstract (from CDS):

We present deep V and I photometry of the isolated dwarf galaxy VV124=UGC 4879, obtained from archival images taken with the Hubble Space Telescope - Advanced Camera for Surveys. In the color-magnitude diagrams of stars at distances greater than 40'' from the center of the galaxy, we clearly identify a well-populated, old horizontal branch (HB) for the first time. 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 dominate in the outskirts of VV124. We also identify a massive (M=1.2±0.2x104M☉) young (age=250±50Myr) star cluster (C1), as well as another of younger age (C2, ≲30±10Myr) with a mass similar to classical open clusters (M≤3.3±0.5x103M☉). Both clusters lie at projected distances less than 100pc from the center of the galaxy.

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Journal keyword(s): galaxies: dwarf - Local Group - galaxies: structure - galaxies: stellar content - galaxies: individual: UGC 4879 - galaxies: ISM

VizieR on-line data: <Available at CDS (J/A+A/533/A37): vv124.dat>

Nomenclature: Fig. 8, Table 4: [BBO2011] CN (No. C2) added. vv124: [BPG2011b] NNNNN N=69795 among (Nos 3-69872).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 10

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