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Velocity dispersions in galaxies. I - The E7 galaxy NGC 7332.A coude spectrum of the E7 galaxy NGC 7332 with 0.9 A-resolution from 4186 to 4364 A was obtained with the Princeton SEC vidicon television camera and the Hale telescope. Comparisons with spectra of G and K giant stars, numerically broadened for various Maxwellian velocity distributions, give a dispersion velocity in the line of sight of 160 (plus or minus 20) km/sec with the best fit at G8 III. The dispersion appears to be constant within plus or minus 35 km/sec out to 1.4 kpc. After correction for projection, the rotation curve has a slope of 0.18 km/sec per pc at the center and a velocity of 130 km/sec at 1.4 kpc where it is still increasing. For an estimated effective radius of 3.5 kpc enclosing half the light, the virial theorem gives a mass of 140 billion solar masses if the mass-to-light ratio is constant throughout the galaxy.
Document ID
19720049787
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Morton, D. C.
Chevalier, R. A.
(Princeton University New Observatory, Princeton, N.J., United States)
Date Acquired
August 6, 2013
Publication Date
June 15, 1972
Publication Information
Publication: Astrophysical Journal
Volume: 174
Subject Category
Space Sciences
Accession Number
72A33453
Funding Number(s)
CONTRACT_GRANT: NSR-31-001-901
CONTRACT_GRANT: NSR-31-001-127
Distribution Limits
Public
Copyright
Other

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