/ftp/cats/aliases/M//MSB2013



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J/AJ/146/145    ALFALFA discovery of Leo P. IV. VI photometry   (Mcquinn+, 2013)
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	table2.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/AJ/146/145
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Beginning of ReadMe : J/AJ/146/145 ALFALFA discovery of Leo P. IV. VI photometry (Mcquinn+, 2013) ================================================================================ ALFALFA discovery of the nearby gas-rich dwarf galaxy Leo P. IV. Distance measurement from LBT optical imaging. McQuinn K.B.W., Skillman E.D., Berg D., Cannon J.M., Salzer J.J., Adams E.A.K., Dolphin A., Giovanelli R., Haynes M.P., Rhode K.L. <Astron. J., 146, 145 (2013)> =2013AJ....146..145M ================================================================================ ADC_Keywords: Galaxies, nearby ; Photometry, VRI Keywords: galaxies: distances and redshifts - galaxies: dwarf - galaxies: evolution - galaxies: fundamental parameters - galaxies: photometry - galaxies: stellar content Abstract: Leo P is a low-luminosity dwarf galaxy discovered through the blind HI Arecibo Legacy Fast ALFA survey. The HI and follow-up optical observations have shown that Leo P is a gas-rich dwarf galaxy with both active star formation and an underlying older population, as well as an extremely low oxygen abundance. Here, we measure the distance to Leo P by applying the tip of the red giant branch (TRGB) distance method to photometry of the resolved stellar population from new Large Binocular Telescope V and I band imaging. We measure a distance modulus of 26.19^+0.17^_-0.50_mag corresponding to a distance of 1.72^+0.14^_0.40_Mpc. Although our photometry reaches 3mag below the TRGB, the sparseness of the red giant branch yields higher uncertainties on the lower limit of the distance. Leo P is outside the Local Group with a distance and velocity consistent with the local Hubble flow. While located in a very low-density environment, Leo P lies within  0.5Mpc of a loose association of dwarf galaxies which include NGC 3109, Antlia, Sextans A, and Sextans B, and 1.1Mpc away from its next nearest neighbor, Leo A. Leo P is one of the lowest metallicity star-forming galaxies known in the nearby universe, comparable in metallicity to I Zw 18 and DDO 68, but with stellar characteristics similar to dwarf spheriodals (dSphs) in the Local Volume such as Carina, Sextans, and Leo II. Given its physical properties and isolation, Leo P may provide an evolutionary link between gas-rich dwarf irregular galaxies and dSphs that have fallen into a Local Group environment and been stripped of their gas. Description: Deep optical observations in the Bessel V and I band filters were obtained with the LBT at the Mt. Graham Observatory using the Large Binocular Cameras (LBC) on the UT date of 2012 November 23. The LBT uses two 8.4m diameter primary mirrors with adaptive optics. The magnitudes were transformed to Johnson V and I magnitudes using the conversion from Lupton provided on the SDSS Web site (http://www.sdss.org/dr5/algorithms/sdssUBVRITransform.html).