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X-ray Detection of the Nuclear Source in the Cygnus a Galaxy

Published online by Cambridge University Press:  19 July 2016

D.E. Harris ,
R.A. Perley  and
C.L. Carilli
D.E. Harris
Affiliation:
Center for Astrophysics, Cambridge, MA, USA
R.A. Perley
Affiliation:
National Radio Astronomy Observatory, Socorro, NM, USA
C.L. Carilli
Affiliation:
Sterrewacht te Leiden, Leiden, the Netherlands

Abstract

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From a ROSAT HRI observation of Cygnus A (42 ksec), we detect x-ray emission from the galaxy identified with the radio source. This was accomplished by subtracting a modified King model: (Surface brightness ∝ to [1+(r/a)2](0.5–3β)) in order to study residual features once the main body of emission from diffuse gas had been deleted. The central source was present for all acceptable values of the core radius, a, and exponent, β. Details of the image processing, an evaluation of emission from the radio hotspots, and a study of the effect of the radio lobes on the gas distribution will be presented elsewhere.

Keywords

X-ray Emission
Type
Poster Contributions: X-Rays and Higher Energies
Information
Symposium - International Astronomical Union , Volume 159: Multi-Wavelength Continuum Emission of AGN , 1994 , pp. 375 - 376
Copyright
Copyright © Kluwer 1994 

References

Arnaud, K.A., Johnston, R.M., Fabian, A.C., Crawford, C.S., Nulsen, P.E., Shafer, R.A., and Mushotzky, R.F. 1987, M.N.R.A.S. , 227, 241 CrossRefGoogle Scholar