NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-20 T12:04:53 PDT
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For refcode 2010A&A...524A..71B:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2010A&A...524A..71B The inner halo of M 87: a first direct view of the red-giant population Bird, S.; Harris, W. E.; Blakeslee, J. P.; Flynn, C. Abstract. An unusually deep (V, I) imaging dataset for the Virgo supergiant M 87 with the Hubble Space Telescope ACS successfully resolves its brightest red-giant stars, reaching M_I_(lim) = -2.5. After assessing the photometric completeness and biasses, we use this material to estimate the metallicity distribution for the inner halo of M 87, finding that the distribution is very broad and likely to peak near [m/H] ~= -0.4 and perhaps higher. The shape of the MDF strongly resembles that of the inner halo for the nearby giant E galaxy NGC 5128. As a byproduct of our study, we also obtain a preliminary measurement of the distance to M 87 with the TRGB (red-giant branch tip) method; the result is (m-M)_0_ = 31.12 +/- 0.14 (d = 16.7 +/- 0.9 Mpc). Averaging this result with three other recent techniques give a weighted mean d(M 87) = (16.4 +/- 0.5) Mpc. Key words: galaxies: stellar content, galaxies: halos, galaxies: individual: M 87
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