A new isolated dSph galaxy near the Local Group

D. I. Makarov; I. D. Karachentsev; L. N. Makarova; L. Rizzi; R. B. Tully

A new isolated dSph galaxy near the Local Group

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arxiv 1411.1674 v1 pith:4MZRBORH submitted 2014-11-06 astro-ph.GA

I. D. Karachentsev , L. N. Makarova , D. I. Makarov , R. B. Tully , L. Rizzi This is my paper

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keywords galaxycolour-magnitudediagramformationisolatedstartotalabsolute

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abstract

Observations of the highly isolated dwarf spheroidal galaxy KKs 3 = [KK2000] 03 with the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) are presented. We measured the galaxy distance of $2.12\pm0.07$ Mpc using the Tip of Red Giant Branch (TRGB) method. The total blue absolute magnitude of the galaxy is estimated as $M_B = -10.8$ mag. We briefly discuss the star formation history of KKs 3 derived from its colour-magnitude diagram. According to our calculation, the total stellar mass of the galaxy is $2.3\times10^7M_{\odot}$, and most stars (74\%) were formed at an early epoch more than 12 Gyr ago. A full description of the properties of the colour-magnitude diagram requires some extension of star formation in metallicity and age.

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