The Bulge Radial Velocity Assay (BRAVA): II. Complete Sample and Data Release
The Bulge Radial Velocity Assay (BRAVA): II. Complete Sample and Data Release
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DOI：
10.1088/0004-6256/143/3/57
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发表时间：
2011-12
期刊：
影响因子：
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通讯作者：
A. Kunder;A. Koch;R. Rich;R. Propris;C. Howard;Scott A. Stubbs;Christian I. Johnson;Christian I. Johnson
中科院分区：
文献类型：
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作者：
A. Kunder;A. Koch;R. Rich;R. Propris;C. Howard;Scott A. Stubbs;Christian I. Johnson;Christian I. Johnson
我们提出了来自膨胀径向速度测定（布拉瓦）的新径向速度测量值，这是对银河系膨胀/棒区域M型巨星的大规模光谱测量。约4500个新的径向速度样本，主要在-10度< l < +10度和B ~ -6度的区域，比现有的公布数据集多一倍以上。我们的新数据将我们的旋转曲线和速度色散曲线扩展到+20度，距离银河系中心约2.8 kpc。新数据证实了在-6度和-8度下观察到的圆柱旋转，并且与Shen等人（2010）的N体杆模型非常吻合。我们测量的TiO分子带的强度作为第一步对恒星样品的金属丰度排名，从我们确认的垂直丰度梯度的存在。我们的调查没有发现以前未知的运动流的有力证据。我们还发布了我们的径向速度，测光，TiO带强度和光谱的完整目录，可在IRSA存档：此http URL以及UCLA：此http URL
We present new radial velocity measurements from the Bulge Radial Velocity Assay (BRAVA), 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 deg < l < +10 deg and b ~ -6 deg more than doubles the existent published data set. Our new data extend our rotation curve and velocity dispersion profile to +20 deg, which is ~2.8 kpc from the Galactic Center. The new data confirm the cylindrical rotation observed at -6 deg and -8 deg, and are an excellent fit to the Shen et al. (2010) N-body bar model. We measure the strength of the TiO molecular band as a first step towards 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 IRSA archive: this http URL as well as at UCLA: this http URL