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J/MNRAS/380/281 Faint galactic satellites spectroscopic survey (Martin+, 2007)
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Beginning of ReadMe :J/MNRAS/380/281 Faint galactic satellites spectroscopic survey (Martin+, 2007)
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A Keck/DEIMOS spectroscopic survey of faint galactic satellites:
searching for the least massive dwarf galaxies.
Martin N.F., Ibata R.A., Chapman S.C., Irwin M., Lewis G.F.
<Mon. Not. R. Astron. Soc., 380, 281-300 (2007)>
=2007MNRAS.380..281M
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ADC_Keywords: Galaxies, photometry ; Spectroscopy ; Radial velocities
Keywords: galaxies: dwarf - galaxies: kinematics and dynamics - Local Group -
dark matter
Abstract:
We present the results of a spectroscopic survey of the recently
discovered faint Milky Way satellites Bootes, Ursa Major I,
Ursa Major II and Willman 1 (Wil1). Using the DEep Imaging
Multi-Object Spectrograph mounted on the Keck II telescope, we have
obtained samples that contain from 15 to 85 probable members of
these satellites for which we derive radial velocities precise to a
few km/s down to i 21-22. About half of these stars are observed with
a high enough signal-to-noise ratio to estimate their metallicity to
within +/-0.2dex. The characteristics of all the observed stars are
made available, along with those of the Canes Venatici I dwarf galaxy
that have been analysed in a companion paper.
Description:
Target stars were selected for observation from the point sources in
the fourth data release (DR4) of the SDSS. For Boo, CVnI and UMaI, two
DEIMOS masks were observed, slightly offset in declination, whereas
only one field in each of UMaII and Wil1 were observed. Each mask was
observed with three exposures of 1200s with the 1200-lines/mm
grating during the nights of 2006 May 27 and 28.