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Multi-wavelength Behaviour of III Zw2

Published online by Cambridge University Press:  05 March 2013

Nikita Salvi ,
Mat J. Page ,
Jason A. Stevens ,
Keith O. Mason  and
Kinwah Wu
Nikita Salvi*
Affiliation:
Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, United Kingdom
Mat J. Page
Affiliation:
Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, United Kingdom
Jason A. Stevens
Affiliation:
Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, United Kingdom
Keith O. Mason
Affiliation:
Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, United Kingdom
Kinwah Wu
Affiliation:
Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, United Kingdom
*
njs@mssl.ucl.ac.uk
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Abstract

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III Zw2 was observed with XMM-Newton in July 2000. Its X-ray spectrum can be described by a power law of photon index Γ≈1.7 with a Gaussian line at 6.7 KeV. There is no significant evidence of intrinsic absorption within the source or of a soft X-ray excess. Multi-wavelength light curves over a period of 25 years show related variations from the radio to X-rays. We interpret the radio to optical emission as synchrotron radiation, self-absorbed in the radio/millimetre region, and the X-rays as mainly due to Compton up-scattering of low energy photons by the population of high energy electrons that give rise to the synchrotron radiation.

Keywords

accretion, accretion disksgalaxies: individual (III Zw2)galaxies: activegalaxies: Seyfertradio continumm: galaxiesX-rays: galaxies
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 19 , Issue 1 , 2002 , pp. 73 - 76
Copyright
Copyright © Astronomical Society of Australia 2002

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