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.
Maupome, L;
Pismis, P;
Aguilar, L
[1]
- Universidad Nacional Autonoma de Mexico, Mexico City. Inst. de Astronomia
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 = []
volume = {6}
place = {Mexico}
year = {1981}
month = {Jan}
}
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 = []
volume = {6}
place = {Mexico}
year = {1981}
month = {Jan}
}