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- W3100969455 abstract "We report the results of a spectroscopic study of the Boötes (Boo) dwarf spheroidal (dSph) galaxy carried out with the WIYN telescope and the Hydra multifiber spectrograph. Radial velocities have been measured for 58 Boo candidate stars selected to have magnitudes and colors consistent with its red and asymptotic giant branches. Within the 13' half-light radius, seven members of Boo yield a systemic velocity of Vr = 95.6 ± 3.4 km s-1 and a velocity dispersion of σ0 = 6.6 ± 2.3 km s-1. This implies a mass on the order of 1 × 107 M☉, similar to the inferred masses of other Galactic dSphs. Adopting a total Boo luminosity of L = 1.8 × 104 to 8.6 × 104 L☉ implies M/L ~ 610-130, making Boo, the most distorted known Milky Way dwarf galaxy, potentially also the darkest. From the spectra of Boo member stars we estimate its metallicity to be [Fe/H] ~ -2.5, which would make it the most metal-poor dSph known to date." @default.
- W3100969455 created "2020-11-23" @default.
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- W3100969455 date "2006-09-29" @default.
- W3100969455 modified "2023-10-05" @default.
- W3100969455 title "Exploring Halo Substructure with Giant Stars: The Dynamics and Metallicity of the Dwarf Spheroidal in Boötes" @default.
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- W3100969455 doi "https://doi.org/10.1086/508685" @default.
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