NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-22 T22:22:04 PDT
Help | Comment | NED Home

For refcode 1993ApJ...419..544S:
Retrieve 3 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1993ApJ...419..544S EVOLUTION IN DUST LANE ELLIPTICALS: DETECTION OF ACCRETED MOLECULAR GAS LESLIE J. SAGE Max-Planck-Institut fur Radioastronomie, Bonn; and Department of Physics, University of Nevada at Las Vegas, Las Vegas, NV 89154 AND GIUESEPPE GALLETTA Dipartimento di Astronomia, Universita di Padova, Vicolo Osservatorio 5,35122 Padova, Italy Received 1992 July 20; accepted 1993 July 2 ABSTRACT The detection of moderately large quantities of molecular gas in three minor axis dust lane elliptical galaxies is reported. Masses of H_2_ between 4 X 10^8^ and 2 x 10^9^ M_sun_ have been observed in NGC 1316, NGC 1947, and NGC 5266. The distribution of the molecular gas follows the dust, which is patchy in NGC 1316, around the nucleus in NGC 1947, and in a ring in NGC 5266. The velocities and directions of motion for the CO agree with those of the ionized gas, which rotates perpendicularly to the stars. Based upon dynamical studies of interacting systems, and following related work on the origin of the H I and ionized gas, we suggest that the H_2_ comes from gas acquired from an external source, probably through the ingestion of a gas-rich dwarf galaxy. Since dwarfs, though typically rich in H I, are notably poor in H_2_, some mechanism must exist which converts the atomic into molecular gas. This may be the result of gas compression inside the ring into which the accreted object is smeared. Following the current theoretical models, the three observed galaxies are situated along a possible evolutionary sequence, with NGC 1316 in the earlier stages of gas (or satellite) accretion and NGC 5266 in a smooth, evolved configuration. The distribution of the molecular gas is entirely consistent with the models. Subject headings: dust, extinction - galaxies: elliptical and lenticular, cD - galaxies: interstellar matter - galaxies: kinematics and dynamics - ISM: molecules
Retrieve 3 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home