Optical, Far-Infrared and X-ray Properties of the FIR quiescent SC Galaxy NGC 247
Abstract
We present a multi-wavelength study of the large Sc galaxy, NGC 247 in the Sculptor group. Optical (B, I and Hα ) CCD, Far-Infrared (FIR) (IRAS 60 and 100microns), and X-ray (ROSAT PSPC, 0.2-2.4keV) images are combined to investigate local and global emission properties. NGC 247 is unique since it has the lowest LFIR, and FIR/B ratio of the large (D25B>8(') ) Sc's observed by IRAS. It may be considered the best example of a FIR quiescent galaxy, although its 60/100microns colour (dust temperature) is not abnormal for an Sc. There are 4-5 X-ray sources (LX ~ 5E37--3E38 erg s(-1) ) located in the disk of the galaxy. These sources are not coincident with the regions of 60microns emission, consistent with the interpretation that the X-ray sources are old population binary systems. Constraints are put on X-ray diffuse emission and source variability.
- Publication:
-
American Astronomical Society Meeting Abstracts #184
- Pub Date:
- May 1994
- Bibcode:
- 1994AAS...184.4808M