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J/AJ/132/714 QUEST RR Lyrae survey. II. Halo overdensities (Vivas+, 2006)
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Beginning of ReadMe :J/AJ/132/714 QUEST RR Lyrae survey. II. Halo overdensities (Vivas+, 2006)
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The QUEST RR Lyrae survey. II. The halo overdensities in the first catalog.
Vivas A.K., Zinn R.
<Astron. J., 132, 714-728 (2006)>
=2006AJ....132..714V
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ADC_Keywords: Stars, variable ; Positional data ; Stars, distances
Keywords: Galaxy: halo - Galaxy: structure - stars: variables: other
Abstract:
The first catalog of the RR Lyrae stars (RRLSs) in the Galactic halo
by the Quasar Equatorial Survey Team (QUEST) has been searched for
significant overdensities that may be debris from disrupted dwarf
galaxies or globular clusters. These RRLSs are contained in a band 23
wide in declination that spans 165deg in right ascension and lie 4
to 60kpc from the Sun. Away from the major overdensities, the
distribution of these stars is adequately fitted by a smooth halo
model, in which the flattening of the halo decreases with increasing
galactocentric distance (as reported by Preston et al.,
1991ApJ...375..121P). This model was used to estimate the background
of RRLSs on which the halo overdensities are overlaid. A procedure was
developed for recognizing groups of stars that constitute significant
overdensities with respect to this background. To test this procedure,
a Monte Carlo routine was used to make artificial RRLS surveys that
follow the smooth halo model but with Poissondistributed noise in the
numbers of RRLSs and, within limits, random variations in the
positions and magnitudes of the artificial stars. The 104 artificial
surveys created by this routine were examined for significant groups
in exactly the same way as the QUEST survey.