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12 papers · 2 filters
Mapping the stellar structure of the Milky Way thick disk and halo using SEGUE photometry
Jelte T. A. de Jong, Brian Yanny, Hans-Walter Rix +3
We map the stellar structure of the Galactic thick disk and halo by applying color-magnitude diagram (CMD) fitting to photometric data from the SEGUE survey, allowing, for the firs…
Metallicity Mapping with gri Photometry: The Virgo Overdensity and the Halos of the Galaxy
Timothy C. Beers, Deokkeun An, Jennifer A. Johnson +7
We describe the methodology required for estimation of photometric estimates of metallicity based on the SDSS gri passbands, which can be used to probe the properties of main-seque…
Light Curve Templates and Galactic Distribution of RR Lyrae Stars from Sloan Digital Sky Survey Stripe 82
Branimir Sesar, Zeljko Ivezic, Skyler H. Grammer +14
We present an improved analysis of halo substructure traced by RR Lyrae stars in the SDSS stripe 82 region. With the addition of SDSS-II data, a revised selection method based on n…
Structure and Kinematics of the Stellar Halos and Thick Disks of the Milky Way Based on Calibration Stars from SDSS DR7
Daniela Carollo, Timothy C. Beers, Masashi Chiba +6
The structure and kinematics of the recognized stellar components of the Milky Way are explored, based on well-determined atmospheric parameters and kinematic quantities for 32360…
The Milky Way Tomography with SDSS: III. Stellar Kinematics
N. A. Bond, Z. Ivezic, B. Sesar +2
We study Milky Way kinematics using a sample of 18.8 million main-sequence stars with r<20 and proper-motion measurements derived from SDSS and POSS astrometry, including ~170,000…
Analysis of the low-energy electron-recoil spectrum of the CDMS experiment
Z. Ahmed, D. S. Akerib, S. Arrenberg +54
We report on the analysis of the low-energy electron-recoil spectrum from the CDMS II experiment using data with an exposure of 443.2 kg-days. The analysis provides details on the…
A Photometric Metallicity Estimate of the Virgo Stellar Overdensity
Deokkeun An, Jennifer A. Johnson, Timothy C. Beers +6
We determine photometric metal abundance estimates for individual main-sequence stars in the Virgo Overdensity (VOD), which covers almost 1000 deg^2 on the sky, based on a calibrat…
Discovery of a New, Polar-Orbiting Debris Stream in the Milky Way Stellar Halo
Heidi Jo Newberg, Brian Yanny, Benjamin A. Willett
We show that there is a low metallicity tidal stream that runs along l=143 deg. in the South Galactic Cap, about 34 kpc from the Sun, discovered from SEGUE stellar velocities. Sinc…
Tracing Sagittarius Structure with SDSS and SEGUE Imaging and Spectroscopy
Brian Yanny, Heidi Jo Newberg, Jennifer A. Johnson +12
We show that the Sagittarius dwarf tidal stream can be traced with very red K/M-giant stars selected from SDSS photometry. A subset of these stars are spectroscopically confirmed w…
SEGUE: A Spectroscopic Survey of 240,000 stars with g=14-20
II SEGUE Collaboration, Brian Yanny, Constance Rockosi +2
The SEGUE survey obtained 240,000 moderate resolution (R = 1800) spectra from 3900 - 9000 Angstroms of fainter Milky Way stars (14.0 < g < 20.3) of a wide variety of spectral types…
Cold Dark Matter Substructure and Galactic Disks II: Dynamical Effects of Hierarchical Satellite Accretion
Stelios Kazantzidis, Andrew R. Zentner, Andrey V. Kravtsov +2
(Abridged) We perform dissipationless N-body simulations to elucidate the dynamical response of thin disks to bombardment by cold dark matter (CDM) substructure. Our method combine…
An Orbit Fit for the Grillmair Dionatos Cold Stellar Stream
Benjamin A. Willett, Heidi Jo Newberg, Haotong Zhang +2
We use velocity and metallicity information from SDSS and SEGUE stellar spectroscopy to fit an orbit to the narrow stellar stream of Grillmair and Dionatos. The stars in…