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The Astrophysical Journal
Article . 2007 . Peer-reviewed
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The Bulge Radial Velocity Assay: Techniques and a Rotation Curve

Authors: R. Michael Rich; David B. Reitzel; Christian D. Howard; HongSheng Zhao;

The Bulge Radial Velocity Assay: Techniques and a Rotation Curve

Abstract

We are undertaking a large-scale radial velocity survey of the Galactic bulge that uses M giant stars selected from the Two Micron All Sky Survey catalog as targets for the Cerro Tololo Inter-American Observatory 4 m Hydra multiobject spectrograph. The aim of this survey is to test dynamical models of the bulge and to quantify the importance, if any, of cold stellar streams in the bulge and its vicinity. Here we report on the kinematics of a strip of fields at -10° < l < +10° and b = -4°. We construct a longitude-velocity plot for the bulge stars and the model data and find that, contrary to previous studies, the bulge does not rotate as a solid body. From -5° < l < +5° the rotation curve has a slope of roughly 100 km s-1 kpc-1 and flattens considerably at greater l, reaching a maximum rotation of 45 km s-1. We compare our rotation curve and velocity dispersion profile to both the self-consistent model of Zhao and to N-body models; neither fits both our observed rotation curve and velocity dispersion profile. The high precision of our radial velocities (~3 km s-1) yields an unexpected result: hints of cold kinematic features are seen in a number of the line-of-sight velocity distributions.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
102
Top 10%
Top 10%
Top 10%
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