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158 papers · 1 filter
Linking dwarf galaxies to halo building blocks with the most metal-poor star in Sculptor
Anna Frebel, Evan Kirby, Joshua D. Simon
Current cosmological models indicate that the Milky Way's stellar halo was assembled from many smaller systems. Based on the apparent absence of the most metal-poor stars in presen…
Haro15: Is it actually a low metallicity galaxy?
V. Firpo, G. Bosch, G. Hagele +2
We present a detailed study of the physical properties of the nebular material in multiple knots of the blue compact dwarf galaxy Haro 15. Using long slit and echelle spectroscopy,…
A long-period planet orbiting a nearby Sun-like star
Hugh R. A. Jones, R. Paul Butler, C. G. Tinney +10
The Doppler wobble induced by the extra-solar planet HD 134987b was first detected by data from the Keck Telescope nearly a decade ago, and was subsequently confirmed by data from…
The GALEX Arecibo SDSS Survey. I. Gas Fraction Scaling Relations of Massive Galaxies and First Data Release
Barbara Catinella, David Schiminovich, Guinevere Kauffmann +23
We introduce the GALEX Arecibo SDSS Survey (GASS), an on-going large program that is gathering high quality HI-line spectra using the Arecibo radio telescope for an unbiased sample…
The Effect of Gas Fraction on the Morphology and Time-scales of Disc Galaxy Mergers
Jennifer M. Lotz, Patrik Jonsson, T. J. Cox +1
Gas-rich galaxy mergers are more easily identified by their disturbed morphologies than mergers with less gas. Because the typical gas fraction of galaxy mergers is expected to inc…
The Effect of Mass Ratio on the Morphology and Time-scales of Disc Galaxy Mergers
Jennifer M. Lotz, Patrik Jonsson, T. J. Cox +1
The majority of galaxy mergers are expected to be minor mergers. The observational signatures of minor mergers are not well understood, thus there exist few constraints on the mino…