Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.4808m&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #48.08; Bulletin of the American Astronomical Society, Vol. 26, p.939
Astronomy and Astrophysics
Astronomy
Scientific paper
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.
Fabbiano Giuseppina
Ikebe Yasushi
Kim Dae Wook
Mackie Glen
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