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The Bulge Radial Velocity Assay (BRAVA): I. Sample selection and a rotation curve

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The Bulge Radial Velocity Assay (BRAVA) : I. Sample selection and a rotation curve. / Howard, Christian D.; Rich, R. Michael; Reitzel, David B.; Koch, Andreas; Propris, Roberto de; Zhao, HongSheng.

In: The Astrophysical Journal, Vol. 688, No. 2, 01.12.2008, p. 1060-1077.

Research output: Contribution to journalJournal articlepeer-review

Harvard

Howard, CD, Rich, RM, Reitzel, DB, Koch, A, Propris, RD & Zhao, H 2008, 'The Bulge Radial Velocity Assay (BRAVA): I. Sample selection and a rotation curve', The Astrophysical Journal, vol. 688, no. 2, pp. 1060-1077. https://doi.org/10.1086/592106

APA

Howard, C. D., Rich, R. M., Reitzel, D. B., Koch, A., Propris, R. D., & Zhao, H. (2008). The Bulge Radial Velocity Assay (BRAVA): I. Sample selection and a rotation curve. The Astrophysical Journal, 688(2), 1060-1077. https://doi.org/10.1086/592106

Vancouver

Howard CD, Rich RM, Reitzel DB, Koch A, Propris RD, Zhao H. The Bulge Radial Velocity Assay (BRAVA): I. Sample selection and a rotation curve. The Astrophysical Journal. 2008 Dec 1;688(2):1060-1077. https://doi.org/10.1086/592106

Author

Howard, Christian D. ; Rich, R. Michael ; Reitzel, David B. ; Koch, Andreas ; Propris, Roberto de ; Zhao, HongSheng. / The Bulge Radial Velocity Assay (BRAVA) : I. Sample selection and a rotation curve. In: The Astrophysical Journal. 2008 ; Vol. 688, No. 2. pp. 1060-1077.

Bibtex

@article{5b7598777db94cbf892ab6099b64f23c,
title = "The Bulge Radial Velocity Assay (BRAVA): I. Sample selection and a rotation curve",
abstract = "Results from the ongoing Bulge Radial Velocity Assay (BRAVA) are presented. BRAVA uses M red giant stars, selected from the 2MASS catalog to lie within a bound of reddening-corrected color and luminosity, as targets for the Cerro Tololo Inter-American Observatory 4 m Hydra multiobject spectrograph. Three years of observations investigate the kinematics of the Galactic bulge major (–10° < l < + 10°, b = − 4°) and minor (–6° < b < + 5°, -0.4° < l < 0.0°) axes with ~3300 radial velocities from 32 bulge fields and one disk field. We construct a longitude-velocity plot for the bulge stars and find that, contrary to previous studies, the bulge does not rotate as a solid body; from –4° < l < + 4° 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 75 km s−1. We compare our rotation curve and velocity dispersion profile both to the self-consistent model of Zhao and to N-body models; neither fits both our observed rotation curve and velocity dispersion profile. We place the bulge on the plot of Vmax/σ vs. epsilon and find that the bulge lies near the oblate rotator line and very close to the parameters of NGC 4565, an edge-on spiral galaxy with a bulge similar to that of the Milky Way. We find that our summed velocity distribution of bulge stars appears to be sampled from a Gaussian distribution, with σ = 116 ± 2 km s−1 for our full data set. Two candidate cold streams are not confirmed with additional data.",
author = "Howard, {Christian D.} and Rich, {R. Michael} and Reitzel, {David B.} and Andreas Koch and Propris, {Roberto de} and HongSheng Zhao",
year = "2008",
month = dec,
day = "1",
doi = "10.1086/592106",
language = "English",
volume = "688",
pages = "1060--1077",
journal = "The Astrophysical Journal",
issn = "0004-637X",
publisher = "Institute of Physics Publishing",
number = "2",

}

RIS

TY - JOUR

T1 - The Bulge Radial Velocity Assay (BRAVA)

T2 - I. Sample selection and a rotation curve

AU - Howard, Christian D.

AU - Rich, R. Michael

AU - Reitzel, David B.

AU - Koch, Andreas

AU - Propris, Roberto de

AU - Zhao, HongSheng

PY - 2008/12/1

Y1 - 2008/12/1

N2 - Results from the ongoing Bulge Radial Velocity Assay (BRAVA) are presented. BRAVA uses M red giant stars, selected from the 2MASS catalog to lie within a bound of reddening-corrected color and luminosity, as targets for the Cerro Tololo Inter-American Observatory 4 m Hydra multiobject spectrograph. Three years of observations investigate the kinematics of the Galactic bulge major (–10° < l < + 10°, b = − 4°) and minor (–6° < b < + 5°, -0.4° < l < 0.0°) axes with ~3300 radial velocities from 32 bulge fields and one disk field. We construct a longitude-velocity plot for the bulge stars and find that, contrary to previous studies, the bulge does not rotate as a solid body; from –4° < l < + 4° 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 75 km s−1. We compare our rotation curve and velocity dispersion profile both to the self-consistent model of Zhao and to N-body models; neither fits both our observed rotation curve and velocity dispersion profile. We place the bulge on the plot of Vmax/σ vs. epsilon and find that the bulge lies near the oblate rotator line and very close to the parameters of NGC 4565, an edge-on spiral galaxy with a bulge similar to that of the Milky Way. We find that our summed velocity distribution of bulge stars appears to be sampled from a Gaussian distribution, with σ = 116 ± 2 km s−1 for our full data set. Two candidate cold streams are not confirmed with additional data.

AB - Results from the ongoing Bulge Radial Velocity Assay (BRAVA) are presented. BRAVA uses M red giant stars, selected from the 2MASS catalog to lie within a bound of reddening-corrected color and luminosity, as targets for the Cerro Tololo Inter-American Observatory 4 m Hydra multiobject spectrograph. Three years of observations investigate the kinematics of the Galactic bulge major (–10° < l < + 10°, b = − 4°) and minor (–6° < b < + 5°, -0.4° < l < 0.0°) axes with ~3300 radial velocities from 32 bulge fields and one disk field. We construct a longitude-velocity plot for the bulge stars and find that, contrary to previous studies, the bulge does not rotate as a solid body; from –4° < l < + 4° 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 75 km s−1. We compare our rotation curve and velocity dispersion profile both to the self-consistent model of Zhao and to N-body models; neither fits both our observed rotation curve and velocity dispersion profile. We place the bulge on the plot of Vmax/σ vs. epsilon and find that the bulge lies near the oblate rotator line and very close to the parameters of NGC 4565, an edge-on spiral galaxy with a bulge similar to that of the Milky Way. We find that our summed velocity distribution of bulge stars appears to be sampled from a Gaussian distribution, with σ = 116 ± 2 km s−1 for our full data set. Two candidate cold streams are not confirmed with additional data.

U2 - 10.1086/592106

DO - 10.1086/592106

M3 - Journal article

VL - 688

SP - 1060

EP - 1077

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 2

ER -