Molecular line CO (2->1) observations of ultraluminous IRAS galaxies.

Details Molecular line CO (2->1) observations of ultraluminous IRAS galaxies. Molecular line CO (2->1) observations of ultraluminous IRAS galaxies.

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...305..747r&link_type=abstract

Astronomy and Astrophysics, v.305, p.747

Astronomy and Astrophysics

Astrophysics

24

Galaxies: Ism, Galaxies: Active, Radio Lines: Galaxies

Scientific paper

CO (J=2->1) observations of six ultraluminous IRAS galaxies are presented. Four of these galaxies have no previous CO J=2->1 data and two have no previous CO detections at all. Based on these observations, molecular hydrogen masses are estimated and range from 5x10^9^ to 1.8x10^10^Msun_. The present data follow the well established correlation that exists between the infrared luminosity L_IR_ and the molecular mass content. The high values of the L_IR_/M_H_2__ suggest either an increased star formation efficiency and / or an additional source of luminosity such as an active nucleus. The ratio R=(J=2->1)/(J=1->0) between the J=2->1 and 1->0 line temperatures, is examined next using our J=2->1 intensities and other published CO J=1->0 data. For Arp 220, Mrk 231, Mrk 273 R lies in the range 0.7 to 1.1; for IRAS 05189 the CO intensity and the ratio R were both found to have extremely low values. The low values of R<=1 found for all galaxies, suggest that the line profiles are dominated by emission coming from optically thick thermalized CO. Finally the line profiles are examined and compared to published models concerning the distribution and kinematics of the gas. Assuming that the CO is distributed in a disk as in normal spiral galaxies, then this region is probably concentrated towards the center of the galaxies.

Affiliated with

Also associated with

No associations

Rating

Molecular line CO (2->1) observations of ultraluminous IRAS galaxies. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Molecular line CO (2->1) observations of ultraluminous IRAS galaxies., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Molecular line CO (2->1) observations of ultraluminous IRAS galaxies. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-967042