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7 papers
Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
Gaia Collaboration, A. G. A. Brown, A. Vallenari +5
At about 1000 days after the launch of Gaia we present the first Gaia data release, Gaia DR1, consisting of astrometry and photometry for over 1 billion sources brighter than magni…
A hierarchical Bayesian approach for reconstructing the Initial Mass Function of Single Stellar Populations
M. Dries, S. C. Trager, L. V. E. Koopmans
Recent studies based on the integrated light of distant galaxies suggest that the initial mass function (IMF) might not be universal. Variations of the IMF with galaxy type and/or…
The X-shooter Spectral Library (XSL): I. DR1. Near-ultraviolet through optical spectra from the first year of the survey
Yan-Ping Chen, S. C. Trager, R. F. Peletier +5
We present the first release of XSL, the X-Shooter Spectral Library. This release contains 237 stars spanning the wavelengths 3000--10200 Å observed at a resolving power $R \equiv…
ESO 381-47, an early-type galaxy with extended HI and a star forming ring
Jennifer L. Donovan, Paolo Serra, J. H. van Gorkom +6
ESO 381-47 is an early type galaxy with an extended HI disk. GALEX and very deep optical images reveal a distinct stellar ring far outside the optical body with a diameter of ~30 k…
Studying The Star Formation Histories of Galaxies in Clusters from Composite Spectra
Alan Dressler, Augustus Oemler, Bianca M. Poggianti +5
We have formed ``composite spectra'' by combining the integrated-light spectra of individual galaxies in 8 intermediate-redshift and 12 low-redshift clusters of galaxies. Because t…
Determination of the Dark Matter Profile of Abell 2199 from Integrated Starlight
Daniel D. Kelson, Ann I. Zabludoff, K. A. Williams +3
We have obtained deep, long-slit spectroscopy along the major axis of NGC 6166, the cD galaxy in the cluster Abell 2199, in order to measure the kinematics of intracluster starligh…