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Radio properties of a complete sample of nearby groups of galaxies

Kolokythas, Konstantinos (2015)
Ph.D. thesis, University of Birmingham.

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Much of the evolution of galaxies takes place in groups where feedback has the greatest impact on galaxy formation. By using an optically selected, statistically complete sample of 53 nearby groups (CLoGS), observed at radio (GMRT) and X-ray (Chandra and XMM-Newton) frequencies, we aim to characterise the radio-AGN population in groups and examine their impact on the intra-group gas and member galaxies. In this dissertation, low-frequency GMRT radio images of the nearby (<80 Mpc) central brightest group ellipticals from the high richness CLoGS sub-sample are presented for the first time at 235 and 610 MHz. Using the sensitivity to older electron populations at 235 MHz and the resolution of 610 MHz as a key to identify past and current AGN activity, a detailed analysis of the radio properties for each of the central group radio sources is performed, with the results being in addition combined with findings from the X-ray observations.

Type of Work:Ph.D. thesis.
Supervisor(s):Raychaudhury, Somak
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Physics and Astronomy
Additional Information:

Publications resulting from research:
New insights into the evolution of the FR I radio galaxy 3C 270 (NGC 4261) from low frequency GMRT radio observations. Konstantinos Kolokythas, Ewan O’Sullivan, Simona Giacintucci, Somak Raychaudhury, C.H. Ishwara-Chandra, Diana M. Worrall and Mark Birkinshaw. Monthly Notices of the Royal Astronomical Society 2015 450 (2): 1732-1744 doi:10.1093/mnras/stv665
Radio properties of nearby groups of galaxies. Konstantinos Kolokythas, Ewan O’Sullivan, Somak Raychaudhury, C.H. Ishwara-Chandra, and Nimisha Kantharia. Proceedings of The Metrewavelength Sky (MWSKY) conference.
First Results from the Complete Local-Volume Groups Sample. Ewan O’Sullivan, Konstantinos Kolokythas, Somak Raychaudhury, Jan M. Vrtilek and Nimisha Kantharia. Proceedings of The Metrewavelength Sky (MWSKY) conference.

Subjects:QB Astronomy
Institution:University of Birmingham
ID Code:6022
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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