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Title:
Revealing Substructure in the Galactic Halo: The SEKBO RR Lyrae Survey
Authors:
Keller, Stefan C.; Murphy, Simon; Prior, Sayuri; Da Costa, Gary; Schmidt, Brian
Affiliation:
AA(Research School of Astronomy and Astrophysics, Australian National University, Canberra, Australia), AB(Research School of Astronomy and Astrophysics, Australian National University, Canberra, Australia), AC(Research School of Astronomy and Astrophysics, Australian National University, Canberra, Australia), AD(Research School of Astronomy and Astrophysics, Australian National University, Canberra, Australia), AE(Research School of Astronomy and Astrophysics, Australian National University, Canberra, Australia)
Publication:
The Astrophysical Journal, Volume 678, Issue 2, pp. 851-864. (ApJ Homepage)
Publication Date:
05/2008
Origin:
UCP
ApJ Keywords:
Galaxy: Halo, Galaxy: Structure, Stars: Variables: Other
DOI:
10.1086/526516
Bibliographic Code:
2008ApJ...678..851K

Abstract

We present a search for RR Lyrae variable stars from archival observations of the Southern Edgeworth-Kuiper Belt Object survey. The survey covers 1675 deg2 along the ecliptic to a mean depth of V=19.5, i.e., a heliocentric distance of ~50 kpc for RR Lyrae stars. The survey reveals 2016 RR Lyrae candidates. Follow-up photometric monitoring of a subset of these candidates shows ~24% contamination by non-RR Lyrae variables. We derive a map of overdensity of RR Lyrae stars in the halo that reveals a series of structures coincident with the leading and trailing arms of debris from the Sagittarius dwarf galaxy. One of the regions of overdensity is found on the trailing arm, 200° from the main body of the Sagittarius dwarf at a distance of ~45 kpc. This distant detection of the stellar population of the outer trailing arm of Sagittarius offers a tight constraint on the motion of the dwarf galaxy. A distinctly separate region of overdensity is seen toward the Virgo overdensity.
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