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18 papers · 2 filters
Seven broad absorption line quasars with excess broad band absorption near 2250 Å
Shaohua Zhang, Jian Ge, Peng Jiang +6
We report the discovery of excess broad band absorption near 2250 A (EBBA) in the spectra of seven broad absorption line (BAL) quasars. By comparing with the statistical results fr…
Young alpha-enriched giant stars in the solar neighbourhood
Marie Martig, Hans-Walter Rix, Victor Silva Aguirre +31
We derive age constraints for 1639 red giants in the APOKASC sample for which seismic parameters from Kepler, as well as effective temperatures, metallicities and [alpha/Fe] values…
Physical and Morphological Properties of [O II] Emitting Galaxies in the HETDEX Pilot Survey
Joanna S. Bridge, Caryl Gronwall, Robin Ciardullo +8
The Hobby-Eberly Dark Energy Experiment pilot survey identified 284 [O II] 3727 emitting galaxies in a 169 square-arcminute field of sky in the redshift range 0 < z < 0.57. This li…
HST Emission Line Galaxies at z ~ 2: The Mystery of Neon
Gregory Zeimann, Robin Ciardullo, Henry Gebhardt +6
We use near-IR grism spectroscopy from the Hubble Space Telescope to examine the strength of [Ne~III] 3869 relative to H-beta, [O~II] 3727 and [O~III] 5007 in 236 low mass (7.5 < l…
The High-Mass End of the Red Sequence at z~0.55 from SDSS-III/BOSS: completeness, bimodality and luminosity function
Antonio D. Montero-Dorta, Adam S. Bolton, Joel R. Brownstein +13
We have developed an analytical method based on forward-modeling techniques to characterize the high-mass end of the red sequence (RS) galaxy population at redshift , fr…
HST Emission Line Galaxies at z ~ 2: The Ly-alpha Escape Fraction
Robin Ciardullo, Gregory Zeimann, Caryl Gronwall +8
We compare the H-beta line strengths of 1.90 < z < 2.35 star-forming galaxies observed with the near-IR grism of the Hubble Space Telescope with ground-based measurements of Ly-alp…
Tracing chemical evolution over the extent of the Milky Way's Disk with APOGEE Red Clump Stars
David L. Nidever, Jo Bovy, Jonathan C. Bird +40
We employ the first two years of data from the near-infrared, high-resolution SDSS-III/APOGEE spectroscopic survey to investigate the distribution of metallicity and alpha-element…
A Glimpse at Quasar Host Galaxy Far-UV Emission, Using DLAs as Natural Coronagraphs
Zheng Cai, Xiaohui Fan, Pasquier Noterdaeme +12
In merger-driven models of massive galaxy evolution, the luminous quasar phase is expected to be accompanied by vigorous star formation in quasar host galaxies. In this paper, we u…
The 0.1<z<1.65 evolution of the bright end of the [OII] luminosity function
Johan Comparat, Johan Richard, Jean-Paul Kneib +33
We present the [OII] luminosity function measured in the redshift range 0.1<z<1.65 with unprecedented depth and accuracy. Our measurements are based on medium resolution flux-calib…
The HETDEX Pilot Survey V: The Physical Origin of Lyman-alpha Emitters Probed by Near-infrared Spectroscopy
Mimi Song, Steven L. Finkelstein, Karl Gebhardt +19
We present the results from a VLT/SINFONI and Keck/NIRSPEC near-infrared spectroscopic survey of 16 Lyman-alpha emitters (LAEs) at = 2.1 - 2.5 in the COSMOS and GOODS-N fields…
3D-HST Emission Line Galaxies at z ~ 2: Discrepancies in the Optical/UV Star Formation Rates
Gregory R. Zeimann, Robin Ciardullo, Henry Gebhardt +6
We use Hubble Space Telescope near-IR grism spectroscopy to examine the H-beta line strengths of 260 star-forming galaxies in the redshift range 1.90 < z < 2.35. We show that at th…
The Vertical Metallicity Gradient of the Milky Way Disk: Transitions in [a/Fe] Populations
Katharine J. Schlesinger, Jennifer A. Johnson, Constance M. Rockosi +10
Using G dwarfs from the Sloan Extension for Galactic Understanding and Exploration (SEGUE) survey, we have determined a vertical metallicity gradient over a large volume of the Mil…
Extinction Maps towards the Milky Way Bulge: 2D and 3D Tests with APOGEE
M. Schultheis, G. Zasowski, C. Allende Prieto +15
Galactic interstellar extinction maps are powerful and necessary tools for Milky Way structure and stellar population analyses, particularly toward the heavily-reddened bulge and i…
Redshift evolution of the dynamical properties of massive galaxies from SDSS-III/BOSS
Alessandra Beifiori, Daniel Thomas, Claudia Maraston +26
We study the redshift evolution of the dynamical properties of ~180,000 massive galaxies from SDSS-III/BOSS combined with a local early-type galaxy sample from SDSS-II in the redsh…
Extremely Red Quasars from SDSS, BOSS and WISE: Classification of Optical Spectra
Nicholas P. Ross, Fred Hamann, Nadia L. Zakamska +10
Quasars with extremely red infrared-to-optical colours are an interesting population that can test ideas about quasar evolution as well as orientation, obscuration and geometric ef…
The APOGEE red-clump catalog: Precise distances, velocities, and high-resolution elemental abundances over a large area of the Milky Way's disk
Jo Bovy, David L. Nidever, Hans-Walter Rix +48
The Sloan Digital Sky Survey III's Apache Point Observatory Galactic Evolution Experiment (APOGEE) is a high-resolution near-infrared spectroscopic survey covering all of the major…
Close companions to two high-redshift quasars
Ian D. McGreer, Xiaohui Fan, Michael A. Strauss +5
We report the serendipitous discoveries of companion galaxies to two high-redshift quasars. SDSS J025617.7+001904 is a z=4.79 quasar included in our recent survey of faint quasars…
Spectral Energy Distribution Fitting of HETDEX Pilot Survey Lyman-alpha Emitters in COSMOS and GOODS-N
Alex Hagen, Robin Ciardullo, Caryl Gronwall +15
We use broadband photometry extending from the rest-frame UV to the near-IR to fit the individual spectral energy distributions (SEDs) of 63 bright (L(Ly-alpha) > 10^43 ergs/s) Ly-…