On the basis of radio wavelength observations, I argue that ultraluminous IRAS galaxies are powered largely by star formation, and that the star formation in these galaxies occurs in both the nucleus and an extended disk. In most sources, the emission mechanism appears to. be synchrotron. The tight correlation between far infrared luminosity and radio luminosity observed for ordinary galaxies (Helou et al., 1985) holds as well for the extremely luminous IRAS galaxies (with L exceeding 1011.4Lo in the far infrared). These conclusions are based on VLA observations of -60 ultraluminous IRAS galaxies of known redshift. The observations were made at 6 and 20 cm wavelength, at resolutions 0.5″ to 15″.
|Original language||English (US)|
|Number of pages||8|
|Journal||Astrophysical Letters and Communications|
|State||Published - Dec 1 1997|
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics