Showing 2013 · astro-ph.GAShow all

11 papers · 2 filters

astro-ph.GA2013

FeLoBAL Outflow Variability Constraints from Multi-Year Observations

Sean M. McGraw, Joseph C. Shields, Frederick W. Hamann +3

The physical properties and dynamical behavior of Broad Absorption Line (BAL) outflows are crucial themes in understanding the connections between galactic centers and their hosts.…

astro-ph.GA2013★ 176 cited

Evolution of Broad-line Emission from Active Galactic Nuclei

Moshe Elitzur, Luis C. Ho, Jonathan R. Trump

Apart from viewing-dependent obscuration, intrinsic broad-line emission from active galactic nuclei (AGNs) follows an evolutionary sequence: Type …

astro-ph.GA2013★ 30 cited

Shocks and Star Formation in Stephan's Quintet. I. Gemini Spectroscopy of Hα-bright knots

I. S. Konstantopoulos, P. N. Appleton, P. Guillard +8

We present a Gemini-GMOS spectroscopic study of HST-selected Hα-emitting regions in Stephan's Quintet (HCG 92), a nearby compact galaxy group, with the aim of disentangling the pro…

astro-ph.GA2013★ 183 cited

Chemical Cartography with APOGEE: Large-scale Mean Metallicity Maps of the Milky Way

Michael R. Hayden, Jon A. Holtzman, Jo Bovy +27

We present Galactic mean metallicity maps derived from the first year of the SDSS-III APOGEE experiment. Mean abundances in different zones of Galactocentric radius (0 < R < 15 kpc…

astro-ph.GA2013★ 213 cited

Chemodynamics of the Milky Way. I. The first year of APOGEE data

F. Anders, C. Chiappini, B. X. Santiago +38

We investigate the chemo-kinematic properties of the Milky Way disc by exploring the first year of data from the Apache Point Observatory Galactic Evolution Experiment (APOGEE), an…

astro-ph.GA2013★ 42 cited

Discovery of a Dynamical Cold Point in the Heart of the Sagittarius dSph Galaxy with Observations from the APOGEE Project

Steven R. Majewski, Sten Hasselquist, Ewa L. Łokas +30

The dynamics of the core of the Sagittarius (Sgr) dwarf spheroidal (dSph) galaxy are explored using high-resolution (R~22,500), H-band, near-infrared spectra of over 1,000 giant st…

astro-ph.GA2013★ 120 cited

The Open Cluster Chemical Analysis and Mapping Survey: Local Galactic Metallicity Gradient with APOGEE using SDSS DR10

Peter M. Frinchaboy, Benjamin Thompson, Kelly M. Jackson +31

The Open Cluster Chemical Analysis and Mapping (OCCAM) Survey aims to produce a comprehensive, uniform, infrared-based dataset for hundreds of open clusters, and constrain key Gala…

astro-ph.GA2013★ 41 cited

A glance at the host galaxy of high-redshift quasars using strong damped Lyman-alpha systems as coronagraphs

Hayley Finley, Patrick Petitjean, Isabelle Pâris +14

We searched quasar spectra from the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS) for the rare occurrences where a strong damped Lyman-alpha absorber (DLA) blocks the Bro…

astro-ph.GA2013★ 44 cited

Hypervelocity Star Candidates in the SEGUE G & K Dwarf Sample

Lauren E. Palladino, Katharine J. Schlesinger, Kelly Holley-Bockelmann +4

We present 20 candidate hypervelocity stars from the Sloan Extension for Galactic Understanding and Exploration (SEGUE) G and K dwarf samples. Previous searches for hypervelocity s…

astro-ph.GA2013★ 402 cited

Target Selection for the Apache Point Observatory Galactic Evolution Experiment (APOGEE)

G. Zasowski, Jennifer A. Johnson, P. M. Frinchaboy +43

The Apache Point Observatory Galactic Evolution Experiment (APOGEE) is a high-resolution infrared spectroscopic survey spanning all Galactic environments (i.e., bulge, disk, and ha…

astro-ph.GA2013★ 188 cited

Discovery of a Binary Brown Dwarf at 2 Parsecs from the Sun

K. L. Luhman

I am using multi-epoch astrometry from the Wide-field Infrared Survey Explorer (WISE) to search for new members of the solar neighborhood via their high proper motions. Through thi…