NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
X-ray emission associated with radio galaxies in the Perseus clusterIn this paper, we report on new x-ray observations of the Perseus cluster made using four separate pointings of the Roentgen Satellite (ROSAT) Positron Sensitive Proportional Counter (PSPC). We searched for x-ray emission associated with 16 radio galaxies and detected six above 3 sigma. We made use of the PSPC spectra to determine if the x-ray emission associated with radio galaxies in Perseus is thermal or nonthermal in origin (i.e., hot gas or an active galactic nuclei (AGN)). For the head-tail radio galaxy IC 310, we find that the data are best fit by a power law model with an unusually large spectral index alpha = 2.7. This is consistent with its unresolved spatial structure. On the other hand, a second resolved x-ray source associated with another radio galaxy 2.3 Mpc from the Perseus center (V Zw 331) is best fit by a thermal model. For three sources with insufficient flux for a full spectral analysis, we calculated hardness ratios. On this basis, the x-ray emission associated with the well known head-tail source NGC 1265 is consistent with thermal radiation. The x-ray spectra of UGC 2608 and UGC 2654 probably arise from hot gas, although very steep power-law spectra (alpha greater than 3.2) are also possible. The spectrum of NGC 1275 is quite complex due to the presence of an AGN and the galaxy's location at the center of a cluster cooling flow.
Document ID
19950032373
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Rhee, George
(New Mexico State Univ. Las Cruces, NM, United States)
Burns, Jack O.
(New Mexico State Univ. Las Cruces, NM, United States)
Kowalski, Michael P.
(Naval Research Lab. Washington, DC, United States)
Date Acquired
August 16, 2013
Publication Date
October 1, 1994
Publication Information
Publication: The Astronomical Journal
Volume: 108
Issue: 4
ISSN: 0004-6256
Subject Category
Astronomy
Accession Number
95A63972
Funding Number(s)
CONTRACT_GRANT: NAGW-3152
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available