Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...331l...5r&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 331, Aug. 1, 1988, p. L5-L8. NASA-supported research.
Astronomy and Astrophysics
Astronomy
63
Active Galactic Nuclei, Infrared Sources (Astronomy), Interstellar Extinction, Seyfert Galaxies, X Ray Sources, Heao 1, Infrared Astronomy Satellite, Star Formation, Stellar Luminosity
Scientific paper
X-ray flux upper limits of 2-10 keV for ultraluminous infrared galaxies were drawn from the HEAO A-1 data base. The hard X-ray luminosities of these sources are much weaker relative to their total luminosities than would be expected for Seyfert 1 galaxies or quasi-stellar objects. Because of the low level of interstellar extinction for hard X-rays, this result suggests that the ultraluminous galaxies are not powered by embedded QSOs that are otherwise similar to other QSOs. Three other possibilities are: (1) the infrared galaxies may contain a form of X-ray-quiet active nucleus; (2) the X-ray sources in active nuclei may not turn on until after the circumnuclear gas has cleared; or (3) the bulk of the infrared luminosity in these galaxies may be generated by intense circumnuclear star formation.
No associations
LandOfFree
Hard X-ray observations of ultraluminous infrared galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Hard X-ray observations of ultraluminous infrared galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hard X-ray observations of ultraluminous infrared galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1693717