The Bulge Radial Velocity Assay (BRAVA): I. Techniques and a Rotation Curve

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dc.creatorRich, R. Michael
dc.creatorReitzel, David B.
dc.creatorHoward, Christian D.
dc.creatorZhao, HongSheng
dc.date2006-11-13
dc.date2007-02-05
dc.date.accessioned2026-07-07T12:31:11Z
dc.date.available2026-07-07T12:31:11Z
dc.descriptionWe are undertaking a large scale radial velocity survey of the Galactic bulge which uses M giant stars selected from the 2MASS catalog as targets for the CTIO 4m Hydra multi-object 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 degres and b=-4 degres. 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 degrees the rotation curve has a slope of roughly 100 km/s/kpc and flattens considerably at greater l and reaches a maximum rotation of 45 km/s. We compare our rotation curve and velocity dispersion profile to both the self-consistent model of Zhao (1996) 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) yields an unexpected result: hints of cold kinematic features are seen in a number of the line of sight velocity distributions.
dc.descriptionAccepted to ApJ letters. This replacement updates the paper to the accepted version
dc.identifierhttps://arxiv.org/abs/astro-ph/0611403
dc.identifierhttp://arxiv.org/abs/astro-ph/0611403
dc.identifierAstrophys.J.658:L29-L32,2007
dc.identifierdoi:10.1086/513509
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/216362
dc.subjectAstrophysics
dc.titleThe Bulge Radial Velocity Assay (BRAVA): I. Techniques and a Rotation Curve
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