NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-22 T18:47:50 PDT
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For refcode 2014MNRAS.443.1281K:
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NED Abstract

Copyright by Royal Astronomical Society. 2014MNRAS.443.1281K KK258, a new transition dwarf galaxy neighbouring the Local Group Karachentsev, I. D.; Makarova, L. N.; Tully, R. B.; Wu, Po-Feng; Kniazev, A. Y. Abstract. Here, we present observations with the Advanced Camera for Surveys on the Hubble Space Telescope of the nearby, transition-type dwarf galaxy KK258 = ESO468-020. We measure a distance of 2.23 +/- 0.05 Mpc using the Tip of Red Giant Branch method. We also detect Halpha emission from this gas-poor dwarf transition galaxy at the velocity V_h_ = 92 +/- 5 or V_LG_ = 150 km s^-1^. With this distance and velocity, KK258 lies near the local Hubble flow locus with a peculiar velocity ~3 km s^-1^. We discuss the star formation history of KK258 derived from its colour-magnitude diagram. The specific star formation rate is estimated to be log[sSFR] = -2.64 and -2.84 (Gyr^-1^) from the FUV-flux and Halpha-flux, respectively. KK258 has the absolute magnitude M_B_ = -10.3 mag, the average surface brightness of 26.0 mag arcsec^-2^ and the hydrogen mass log(M_H I_ < 5.75 M_sun_. We compare KK258 with 29 other dTr- galaxies situated within 5 Mpc from us, and conclude that its properties are typical for transition dwarfs. However, KK258 resides 0.8 Mpc away from its significant neighbour, the Sdm galaxy NGC 55, and such a spatial isolation is unusual for the local transition dwarfs. Key words: galaxies: distances and redshifts, galaxies: dwarf, galaxies: individual: KK258, galaxies: stellar content
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