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J/ApJ/692/1464 Spectroscopy of Segue 1 (Geha+, 2009)
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Beginning of ReadMe :J/ApJ/692/1464 Spectroscopy of Segue 1 (Geha+, 2009)
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The least-luminous galaxy: spectroscopy of the Milky Way satellite Segue 1.
Geha M., Willman B., Simon J.D., Strigari L.E., Kirby E.N., Law D.R.,
Strader J.
<Astrophys. J., 692, 1464-1475 (2009)>
=2009ApJ...692.1464G
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ADC_Keywords: Galaxies, nearby ; Photometry, SDSS ; Radial velocities
Keywords: galaxies: dwarf - galaxies: individual (Segue 1) - galaxies:
kinematics and dynamics - Local Group
Abstract:
We present Keck/DEIMOS spectroscopy of Segue 1, an
ultra-low-luminosity (M_V_=-1.5^+0.6^_-0.8_) Milky Way satellite
companion. While the combined size and luminosity of Segue 1 are
consistent with either a globular cluster or a dwarf galaxy, we
present spectroscopic evidence that this object is a dark
matter-dominated dwarf galaxy. We identify 24 stars as members of
Segue 1 with a mean heliocentric recession velocity of 206+/-1.3km/s.
Although Segue 1 spatially overlaps the leading arm of the Sagittarius
stream, its velocity is 100km/s different from that predicted for
recent Sagittarius tidal debris at this position. Using spectral
synthesis modeling, we derive a metallicity for the single red giant
branch star in our sample of [Fe/H]=-3.3+/-0.2dex. We conclude that
Segue 1 is the least luminous of the ultra-faint galaxies recently
discovered around the Milky Way, and is thus the least-luminous known
galaxy.
Description:
Targets were selected for spectroscopy based on gri photometry of
Segue 1 from the SDSS DR6 public database.
One multislit mask was observed for Segue 1 using the Keck II 10m
telescope and the DEIMOS spectrograph on the night of 2007 November
12. The mask was observed for a total of 5400s through the 1200
line/mm grating covering a wavelength region 6400-9100AA and the
resulting spectral resolution is 1.37AA (FWHM).