CO-Line Emission from the Clumpy Irregular Galaxy Markarian 297
Abstract
(12) CO (J=1-0)-line emission has been detected in the direction of the clumpy irregular galaxy Mrk 297 (Arp 209, NGC 6052). The CO emission region is compact, associated with the brightest optical knots and slightly extended toward the east. The estimated molecular mass is ~ 5 times 10(9) M_{sun hskip -5.2pt }, comparable to the Hi mass. The FIR-to-CO luminosity ratio suggests that this galaxy is a typical starburster. The kinematics of the CO and Hi gases are discussed based on a radial-penetration encounter model of two galaxies on the line of sight. A mildly disturbed component, which is seen nearly face-on, contains both Hi and molecular gas, and the tidal disturbance may have caused the active star formation in dense molecular clouds. On the other hand, the more disturbed edge-on component contains much Hi, but little molecular gas, which may have become dissociated during a tidal encounter.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- June 1990
- Bibcode:
- 1990PASJ...42L..45S
- Keywords:
-
- Galactic Radiation;
- Interacting Galaxies;
- Irregular Galaxies;
- Markarian Galaxies;
- Star Formation;
- Starburst Galaxies;
- Carbon Monoxide;
- Emission Spectra;
- Line Spectra;
- Molecular Gases;
- Astrophysics;
- CO EMISSION;
- GALAXIES;
- INTERACTING;
- MOLECULAR HYDROGEN;
- STARBURST;
- STAR FORMATION