The Star Formation History of Isolated Dwarf UGC4879
Bradley A. Jacobs, R. Brent Tully, Luca Rizzi, Igor D. Karachentsev,, Kristin Chiboucas, Enrico V. Held
TL;DR
This paper studies the isolated dwarf galaxy UGC4879, measuring its distance and star formation history, providing insights into galaxy evolution unaffected by external interactions.
Contribution
It presents the first detailed star formation history of UGC4879 derived from Hubble observations, emphasizing its isolation as a key factor.
Findings
Distance of 1.36 Mpc confirmed for UGC4879
UGC4879 is beyond the Local Group's first turnaround radius
Star formation history derived from simulated color-magnitude diagrams
Abstract
Recent observations of UGC4879 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 UGC4879 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 UGC4879 derived from simulated color-magnitude diagrams.
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