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Record 46 of 13372
Velocity dispersions in galaxies. I - The E7 galaxy NGC 7332.
External Online Source: doi:10.1086/151511
Author and Affiliation:
Morton, D. C.
Chevalier, R. A.(Princeton University, New Observatory, Princeton, N.J., United States)
Abstract: 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.
Publication Date: Jun 15, 1972
Document ID:
19720049787
(Acquired Dec 04, 1995)
Accession Number: 72A33453
Subject Category: SPACE SCIENCES
Document Type: Journal Article
Publication Information: Astrophysical Journal; 174; June 15
Publisher Information: United States
Contract/Grant/Task Num: NSR-31-001-901; NSR-31-001-127
Financial Sponsor: NASA; United States
Description: 10p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: GALAXIES; SPECTRUM ANALYSIS; STELLAR MOTIONS; VELOCITY DISTRIBUTION; GIANT STARS; STELLAR SPECTRA; VIRIAL THEOREM
Imprint And Other Notes: Astrophysical Journal, vol. 174, June 15, 1972, pt. 1, p. 489-498.
Miscellaneous Notes: 1972, pt. 1, p. 489-498
Availability Source: Other Sources
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