Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.0207g&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #02.07; Bulletin of the American Astronomical Society, Vol. 24, p.728
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We have observed 5 active or infrared bright galaxies to examine the distribution of their far infrared emission. Observations of Arp 243, MKN 231, NGC 1275, NGC 4151, and NGC 4710 were made in February 1992 at 100 microns aboard the Kuiper Airborne Observatory (KAO) using the Harvey multi-channel photometer. These measurements were made at the KAO's diffraction limited resolution of 22" using a 10x2 array of bolometers on 14" centers, allowing us to examine the profile of the central 140" of these galaxies. Special efforts were taken to accurately calibrate our fluxes. By comparing the measured peak flux from these small beam measurements to the 100 microns flux from the much larger beam of the IRAS survey, we can look for extension on a scale larger than our beam size. Because of these different beam sizes, any flux seen by IRAS but not detected by our measurements must be coming from either an extended source or a source which did not fall on our array. We have found evidence of extended or extra-nuclear emission from three of the galaxies in our sample. The amount of missing flux relative to the total IRAS flux ranges from 30\ far infrared emission from these galaxies must be thermal emission from the disk rather than synchrotron from an active nucleus (c.f. Edelson and Malkan 1986). We note that a significant percentage of the flux from NGC 1275 appears to be coming from a bright star formation region 18" from the nucleus. Shields and Filippenko (1990) suggest that this represents accretion in a cooling flow from the AGN. MKN 231 and NGC 4710 both appear to be point sources at this resolution. References: Edelson, R. A., and Malkan, M. A. 1986 ApJ 308, 59 Shields, J. C., and Filippenko, A. V. 1990 ApJ (Letters) 353, L7
Colome Cecilia
Doppmann Greg
Gaffney Niall I.
Harvey Paul
Lester Dan F.
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