Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000stin...0018003w&link_type=abstract
Technical Report, Smithsonian Astrophysical Observatory Cambridge, MA United States
Astronomy and Astrophysics
Astronomy
Radio Galaxies, Red Shift, X Ray Astronomy, X Ray Sources, Cosmic X Rays, Radio Sources (Astronomy), Gravitational Fields, Rosat Mission, Spaceborne Astronomy, Gas Density
Scientific paper
The research exploited ROSAT's sensitivity, together with its spatial and spectral resolution, to separate X-ray emission components in the sources. Prior to ROSAT, the dominant X-ray emission mechanism in radio galaxies as a class was unclear, with correlations between the X-ray and radio emission used on one hand to argue for a nuclear origin for the X-rays, and on the other hand for a thermal origin. Our observations (normally between 10 and 25 ks in length) routinely detected the target sources, and demonstrated that both resolved (thermal) and unresolved X-ray emission are typically present. Highlights of our work included two of the first detections of high-power radio galaxies at high redshift, 3C 280 and 3C 220.1. When combined with the work of two other groups, we find that of the 38 radio galaxies at z > 0.6 in the 3CRR sample, 12 were observed in ROSAT pointed observations and 9 were detected with the four most significant detections exhibiting source extent, including 3C 280 and 3C 220.1. Moreover, we discovered extended emission around five 3CRR quasars at redshift greater than about 0.4, one of which is at z > 0.6. Unification predicts that the X-ray environments of powerful radio galaxies and quasars should be similar, and our results show that powerful radio sources are finding some of the highest-redshift X-ray clusters known to date, pointing to deep gravitational potential wells early in the Universe.
No associations
LandOfFree
Beamed and Unbeamed X-Ray Emission in FR1 Radio 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 Beamed and Unbeamed X-Ray Emission in FR1 Radio Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Beamed and Unbeamed X-Ray Emission in FR1 Radio Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-811566