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Mass of the spirals galaxies

Conference:

Abstract

In an earlier paper we have found that the total mass of galaxies-especially of the spirals-based on values published until 1975, decreased as the Hubble type varied from Sa through Sc and Irregulars. It was also pointed out that masses determined from the hydrogen 21-cm line were higher than the optically determined masses. To investigate the cause of these tendencies we have estimated the masses using an analytic rotation curve of Brandt adjusted to the optical observations in order to include all the mass of a galaxy up to the last observed point. Although the masses computed in this manner were found to be larger, as expected, the decrease of mass with Hubble type found earlier is confirmed. However, there is a discrepancy in the earlier types (Sa, Sab) in that their radio-masses are smaller than the optically determined ones. At present, the cause of this is not clear.
Authors:
Maupome, L; Pismis, P; Aguilar, L [1] 
  1. Universidad Nacional Autonoma de Mexico, Mexico City. Inst. de Astronomia
Publication Date:
Jan 01, 1981
Product Type:
Conference
Reference Number:
AIX-14-718569; EDB-83-037316
Resource Relation:
Journal Name: Rev. Mex. Astron. Astrofis.; (Mexico); Journal Volume: 6; Conference: 2. Latin American Regional Meeting on Astronomy, Merida (Venezuela), 19 - 23 Jan 1981
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; GALAXIES; COSMOLOGICAL MODELS; ASTROPHYSICS; GALACTIC EVOLUTION; MOSSES; UNIVERSE; MATHEMATICAL MODELS; PLANTS; 640105* - Astrophysics & Cosmology- Galaxies
OSTI ID:
6560376
Country of Origin:
Mexico
Language:
Spanish
Other Identifying Numbers:
Journal ID: CODEN: RMAAD
Submitting Site:
HEDB
Size:
Pages: 45-51
Announcement Date:

Conference:

Citation Formats

Maupome, L, Pismis, P, and Aguilar, L. Mass of the spirals galaxies. Mexico: N. p., 1981. Web.
Maupome, L, Pismis, P, & Aguilar, L. Mass of the spirals galaxies. Mexico.
Maupome, L, Pismis, P, and Aguilar, L. 1981. "Mass of the spirals galaxies." Mexico.
@misc{etde_6560376,
title = {Mass of the spirals galaxies}
author = {Maupome, L, Pismis, P, and Aguilar, L}
abstractNote = {In an earlier paper we have found that the total mass of galaxies-especially of the spirals-based on values published until 1975, decreased as the Hubble type varied from Sa through Sc and Irregulars. It was also pointed out that masses determined from the hydrogen 21-cm line were higher than the optically determined masses. To investigate the cause of these tendencies we have estimated the masses using an analytic rotation curve of Brandt adjusted to the optical observations in order to include all the mass of a galaxy up to the last observed point. Although the masses computed in this manner were found to be larger, as expected, the decrease of mass with Hubble type found earlier is confirmed. However, there is a discrepancy in the earlier types (Sa, Sab) in that their radio-masses are smaller than the optically determined ones. At present, the cause of this is not clear.}
journal = {Rev. Mex. Astron. Astrofis.; (Mexico)}
volume = {6}
place = {Mexico}
year = {1981}
month = {Jan}
}