Selection of Metal-poor Giant Stars Using the Sloan Digital Sky Survey Photometric System

Abstract

We present a method for photometric selection of metal-poor halo giants from the imaging data of the Sloan Digital Sky Survey (SDSS). These stars are offset from the stellar locus in the (g-r) vs. (u-g) color-color diagram. Based on a sample of 29 candidates for which spectra were taken, we derive a selection efficiency of the order of 50%, for stars brighter than $r\sim 17^m$. The candidates selected in 400 deg${}^2$ of sky from the SDSS Early Data Release trace the known halo structures (tidal streams from the Sagittarius dwarf galaxy, the Draco dwarf spheroidal galaxy), indicating that such a color-selected sample can be used to study the halo structure even without spectroscopic information. This method, and supplemental techniques for selecting halo stars, such as RR Lyrae stars and other blue horizontal branch stars, can produce an unprecedented three-dimensional map of the Galactic halo based on the SDSS imaging survey.

arXiv comment8 pages, 3 figures, 1 table. Accepted by ApJ

References in corpus (21)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• The Sloan Digital Sky Survey: Technical Summary
• The Sloan Digital Sky Survey Photometric Camera
• The u'g'r'i'z' Standard Star Network
• The Ghost of Sagittarius and Lumps in the Halo of the Milky Way
• A photometricity and extinction monitor at the Apache Point Observatory
• Identification of A-colored Stars and Structure in the Halo of the Milky Way from SDSS Commissioning Data
• Fossil Signatures of Ancient Accretion Events in the Halo
• The Hierarchical Origin of Galaxy Morphologies
• Candidate RR Lyrae Stars Found in Sloan Digital Sky Survey Commissioning Data
• Simulation of Stellar Objects in SDSS Color Space
• The QUEST RR Lyrae Survey: Confirmation of the Clump at 50 kpc and Other Over-Densities in the Outer Halo
• Exploring Halo Substructure with Giant Stars: I. Survey Description and Calibration of the Photometric Search Technique
• Mapping the Galactic Halo I. The `Spaghetti' Survey
• New insights on the Draco dwarf spheroidal galaxy from SDSS: a larger radius and no tidal tails
• Optical and Infrared Colors of Stars Observed by 2MASS and SDSS
• Tidal debris of dwarf spheroidals as a probe of structure formation models
• Tidal streams in the Galactic halo: Evidence for the Sagittarius northern stream or traces of a new nearby dwarf galaxy
• Mapping the Galactic Halo. V. Sgr dSph Tidal Debris 60 degrees from the Main Body
• Mapping the Galactic Halo III. Simulated Observations of Tidal Streams
• An SDSS Survey For Resolved Milky Way Satellite Galaxies I: Detection Limits

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