Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325..563f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 325, Feb. 15, 1988, p. 563-565. Research supported by the University of Tex
Astronomy and Astrophysics
Astrophysics
7
Astronomical Spectroscopy, Galactic Bulge, Galactic Nuclei, Milky Way Galaxy, Velocity Distribution, Globular Clusters, K Stars, Mira Variables, Planetary Nebulae, Spectrum Analysis
Scientific paper
The velocity dispersion of the K giant population in the Galactic bulge has been measured. Two fields in the brightest parts of the great Sagittarius cloud whose lines of sight pass within 0.5 and 0.7 kpc from the Galactic center were observed on three nights each to produce high signal-to-noise sky-subtracted spectra of the 4965-5400 A region at 1.2 A resolution. The velocity dispersions in the two fields derived by the Fourier quotient technique are, respectively 118 and 129 km/s, with a weighted mean of 122 + or - 7 (m.e.), in excellent agreement with the mean velocity dispersion previously derived from the kinematics of 'test particles', such as globular clusters, RR Lyrae and Mira-type variables, and planetary nebulae. This result confirms the validity of the Fourier quotient method applied to the integrated spectra of the unresolved bulges of external galaxies. The central velocity dispersion of the galactic bulge is 128 + or - 7 km/s.
de Vaucouleurs Antoinette
de Vaucouleurs Gerard
Freeman Ken C.
Wainscoat Richard J.
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