The Star Formation History of Isolated Dwarf UGC4879

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.

10 pages, 15 figures. Accepted for publication in the Astronomical Journal

Cited by in corpus (10)

• The Star Formation Histories of Local Group Dwarf Galaxies I. Hubble Space Telescope / Wide Field Planetary Camera 2 Observations
• Comparing Tip of the Red Giant Branch Distance Scales: An Independent Reduction of the Carnegie-Chicago Hubble Program and the Value of the Hubble Constant
• The Extragalactic Distance Database: The Color-Magnitude Diagrams and Tip of the Red Giant Branch Distances Catalog
• Delayed Star Formation in Isolated Dwarf Galaxies: HST Star Formation History of the Aquarius Dwarf Irregular
• The stellar metallicity gradients of Local Group dwarf galaxies
• Pecular velocities of galaxies in the Leo Spur
• The Dynamics and Metallicity Distribution of the Distant Dwarf Galaxy VV124
• Solo dwarfs III: Exploring the orbital origins of isolated Local Group galaxies with Gaia Data Release 2
• Solo dwarfs II: The stellar structure of isolated Local Group dwarf galaxies
• KK258, a new transition dwarf galaxy neighbouring the Local Group