NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-22 T06:47:04 PDT
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For refcode 2011AJ....141..106J:
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Copyright by American Astronomical Society. Reproduced by permission
2011AJ....141..106J The Star Formation History of Isolated Dwarf UGC 4879 Jacobs, Bradley A.; Tully, R. Brent; Rizzi, Luca; Karachentsev, Igor D.; Chiboucas, Kristin; Held, Enrico V. Abstract. Recent observations of UGC 4879 with the Advanced Camera for Surveys on the Hubble Space Telescope confirm that it is a nearby isolated dwarf irregular galaxy. We measure a distance of 1.36 +/- 0.03 Mpc using the tip of the red giant branch method. This distance puts UGC 4879 beyond the radius of first turnaround of the Local Group and ~700 kpc from its nearest neighbor Leo A. This isolation makes this galaxy an ideal laboratory for studying pristine star formation uncomplicated by interactions with other galaxies. We present the star formation history of UGC 4879 derived from simulated color-magnitude diagrams. Key words: galaxies: distances and redshifts, galaxies: dwarf, galaxies: individual: UGC 4879 (VV124), galaxies: stellar content
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