Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.1137r&link_type=abstract
The Astronomical Journal, vol. 108, no. 4, p. 1137-1146
Astronomy and Astrophysics
Astrophysics
15
Active Galactic Nuclei, Astronomical Models, Emission Spectra, Galactic Clusters, Power Spectra, Radio Galaxies, Spectrum Analysis, X Ray Astronomy, X Ray Spectra, Astronomical Spectroscopy, Cooling Flows (Astrophysics), Power Series, Proportional Counters, Rosat Mission, Thermal Analysis, X Ray Spectroscopy
Scientific paper
In 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.
Burns O. Jr. J.
Kowalski Michael P.
Rhee George
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