2012ApJ...756...23A -
Astrophys. J., 756, 23 (2012/September-1)
Probing the stellar halo of the Milky Way with the SEKBO RR Lyrae survey.
AKHTER S., DA COSTA G.S., KELLER S.C. and SCHMIDT B.P.
Abstract (from CDS):
We investigate the steepening of the power-law slope beyond the Galactocentric radius of R ∼ 45 kpc in the RR Lyrae (RRL) space density distribution found by Keller et al. They identified 2016 RRL candidates derived from the analysis of archival observations of the Southern Edgeworth-Kuiper Belt Object (SEKBO) survey. Our aim is to verify the completeness of RRLs and ultimately the space density distribution function given by Keller et al. We followed up on a subset of 137 candidates with a range of magnitudes (V ∼ 14-20) using the Faulkes Telescope (FT) database and confirmed 57 candidates as real RRLs. A cross-match between SEKBO RRL survey and Sloan Digital Sky Survey Data Release-7 (SDSS DR-7) revealed 272 RRL candidates in common. Applying the color selection criteria proposed by Ivezic et al. resulted in 193 likely RRLs. The completeness as a function of magnitude was calculated empirically from the combined set of SEKBO RRL candidates from current FT data, SDSS cross-matched data, and the Prior et al. catalog. This resulted in a spatial density distribution characterized by two power laws with a break radius R within a range between 45 kpc and 50 kpc, similar to the results of Keller et al. We find the power-law slopes for the inner halo as ninner= -2.78 ±0.02 and for the outer halo as nouter= -5.0±0.2.
Abstract Copyright:
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Journal keyword(s):
Galaxy: halo - Galaxy: structure - stars: Population II - stars: variables: RR Lyrae
VizieR on-line data:
<Available at CDS (J/ApJ/756/23): table2.dat>
Simbad objects:
60
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