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The Bulge Radial Velocity Assay (BRAVA): II. Complete sample and data release

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Published
  • Andrea Kunder
  • Andreas Koch
  • R. Michael Rich
  • Roberto de Propris
  • Christian D. Howard
  • Scott A. Stubbs
  • Christian I. Johnson
  • Juntai Shen
  • Yougang Wang
  • Annie C. Robin
  • John Kormendy
  • Mario Soto
  • Peter Frinchaboy
  • David B. Reitzel
  • HongSheng Zhao
  • Livia Origlia
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Article number57
<mark>Journal publication date</mark>6/02/2012
<mark>Journal</mark>The Astronomical Journal
Issue number3
Volume143
Number of pages14
Publication StatusPublished
<mark>Original language</mark>English

Abstract

We present new radial velocity measurements from the Bulge Radial Velocity Assay, a large-scale spectroscopic survey of M-type giants in the Galactic bulge/bar region. The sample of ~4500 new radial velocities, mostly in the region –10° < l < +10° and b ≈ –6°, more than doubles the existent published data set. Our new data extend our rotation curve and velocity dispersion profile to +20°, which is ~2.8 kpc from the Galactic center. The new data confirm the cylindrical rotation observed at –6° and –8° and are an excellent fit to the Shen et al. N-body bar model. We measure the strength of the TiOε molecular band as a first step toward a metallicity ranking of the stellar sample, from which we confirm the presence of a vertical abundance gradient. Our survey finds no strong evidence of previously unknown kinematic streams. We also publish our complete catalog of radial velocities, photometry, TiO band strengths, and spectra, which is available at the Infrared Science Archive as well as at UCLA.

Bibliographic note

accepted to the Astronomical Journal