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Metallicity and Alpha-Element Abundance Measurement in Red Giant Stars from Medium Resolution Spectra
Evan N. Kirby, Puragra Guhathakurta, Christopher Sneden
We present a technique that applies spectral synthesis to medium resolution spectroscopy (MRS, R ~ 6000) in the red (6300 A < lambda < 9100 A) to measure [Fe/H] and [alpha/Fe] of i…
A Subaru/Suprime-Cam Survey of M31's spheroid along the South-East minor axis
Mikito Tanaka, Masashi Chiba, Yutaka Komiyama +2
We have used Suprime-Cam on the Subaru Telescope to conduct a V- and I-band imaging survey of fields sampling the spheroid of the Andromeda galaxy along its south-east minor axis.…
The DEEP2 Galaxy Redshift Survey: Redshift Identification of Single-Line Emission Galaxies
E. N. Kirby, P. Guhathakurta, S. M. Faber +3
We present two methods for determining spectroscopic redshifts of galaxies in the DEEP2 survey which display only one identifiable feature, an emission line, in the observed spectr…
Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
K. G. Noeske, B. J. Weiner, S. M. Faber +26
We analyze star formation (SF) as a function of stellar mass (M*) and redshift z in the All Wavelength Extended Groth Strip International Survey (AEGIS). For 2905 field galaxies, c…
Discovery of an extended halo of metal-poor stars in the Andromeda spiral galaxy
Puragra Guhathakurta, James C. Ostheimer, Karoline M. Gilbert +5
Understanding galaxy formation involves look-back and fossil-record studies of distant and nearby galaxies, respectively. Debris trails in our Galaxy's spheroidal halo of old stars…
Supernovae in Galaxy Clusters
A. Gal-Yam, D. Maoz, K. Sharon +3
We present the results of several surveys for supernovae (SNe) in galaxy clusters. SNe discovered in deep, archival HST images were used to measure the cluster SN Ia rate to z=1. A…