Abstract
view Abstract Citations (9) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Spectroscopic Determination of the Velocity Dispersion in the Galactic Bulge Freeman, K. C. ; de Vaucouleurs, G. ; de Vaucouleurs, A. ; Wainscoat, R. J. Abstract 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. Publication: The Astrophysical Journal Pub Date: February 1988 DOI: 10.1086/166027 Bibcode: 1988ApJ...325..563F Keywords: Astronomical Spectroscopy; Galactic Bulge; Galactic Nuclei; Milky Way Galaxy; Velocity Distribution; Globular Clusters; K Stars; Mira Variables; Planetary Nebulae; Spectrum Analysis; Astrophysics; GALAXIES: FORMATION; GALAXIES: INTERNAL MOTIONS; GALAXIES: NUCLEI; GALAXIES: THE GALAXY full text sources ADS | data products SIMBAD (3)
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