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Velocity dispersions in galaxies: 1: The SO galaxy NGC 7332A Coude spectrum of the SO galaxy NGC 7332 with 0.9 A resolution from 4186 to 4364 A was obtained with the 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 + or - 20 km/sec with the best fit at G8III. The dispersion appears to be constant within + or - 35 km/sec out to 1.4 kpc (H = 100 km/sec/mpc). After correction for projection, the rotation curve has a slope of 0.16 km/sec/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 1.4 x 10 to the 11th power solar masses if the mass-to-light ratio is constant throughout the galaxy. The photographic luminosity is 8.3 x 10 to the 9th power solar luminosities so that the M/L ratio is 17.
Document ID
19720006186
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Morton, D. C.
(Princeton Univ. Observatory NJ, United States)
Chevalier, R. A.
(Princeton Univ. Observatory NJ, United States)
Date Acquired
August 6, 2013
Publication Date
January 1, 1971
Subject Category
Space Sciences
Report/Patent Number
NASA-CR-124811
Accession Number
72N13835
Funding Number(s)
CONTRACT_GRANT: NSR-31-001-127
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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