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• W3106396239 endingPage "46" @default.
• W3106396239 startingPage "46" @default.
• W3106396239 abstract "VV124 (UGC 4879) is an isolated, dwarf irregular/dwarf spheroidal (dIrr/dSph) transition-type galaxy at a distance of 1.36 Mpc. Previous low-resolution spectroscopy yielded inconsistent radial velocities for different components of the galaxy, and photometry hinted at the presence of a stellar disk. In order to quantify the stellar dynamics, we observed individual red giants in VV124 with the Keck/Deep Extragalactic Imaging Multi-Object Spectrograph (DEIMOS). We validated members based on their positions in the color–magnitude diagram, radial velocities, and spectral features. Our sample contains 67 members. The average radial velocity is 〈vr〉 = −29.1 ± 1.3 km s−1 in agreement with the previous radio measurements of H i gas. The velocity distribution is Gaussian, indicating that VV124 is supported primarily by velocity dispersion inside a radius of 1.5 kpc. Outside that radius, our measurements provide only an upper limit of 8.6 km s−1 on any rotation in the photometric disk-like feature. The velocity dispersion is σv = 9.4 ± 1.0 km s−1, from which we inferred a mass of M1/2 = (2.1 ± 0.2) × 107 M☉ and a mass-to-light ratio of (M/LV)1/2 = 5.2 ± 1.1 M☉/L☉, both measured within the half-light radius. Thus, VV124 contains dark matter. We also measured the metallicity distribution from neutral iron lines. The average metallicity, 〈[Fe/H]〉 = −1.14 ± 0.06, is consistent with the mass–metallicity relation defined by dSph galaxies. The dynamics and metallicity distribution of VV124 appear similar to dSphs of similar stellar mass." @default.
• W3106396239 created "2020-11-23" @default.
• W3106396239 creator A5021303177 @default.
• W3106396239 creator A5042918487 @default.
• W3106396239 creator A5051258340 @default.
• W3106396239 date "2012-05-03" @default.
• W3106396239 modified "2023-10-16" @default.
• W3106396239 title "THE DYNAMICS AND METALLICITY DISTRIBUTION OF THE DISTANT DWARF GALAXY VV124" @default.
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• W3106396239 doi "https://doi.org/10.1088/0004-637x/751/1/46" @default.
• W3106396239 hasPublicationYear "2012" @default.
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