Parra, Rodrigo and Conway, John and Appelton, Phil and Pihlström, Ylva (2005) Preliminary results from the COLA N sample. In: The Evolution of Starbursts: The 331st Wilhelm and Elsa Heraeus Seminar. AIP Conference Proceedings. No.783. American Institute of Physics , Melville, NY, pp. 241-244. ISBN 0-7354-0270-1 http://resolver.caltech.edu/CaltechAUTHORS:20110811-103750452
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We present preliminary radio imaging results for the northern COLA (Compact Objects in Low power AGN) sample. COLA is a large sample of moderate luminosity 10 ≤ log(L_(FIR)/L_☉) ≤ 12 infra-red selected galaxies. Our primary aim is to investigate possible connections between starburst activity and AGN. The sample has been observed in a variety of wavebands searching for correlations between AGN presence, galactic structure, gas content or degree of interaction. VLA A-array observations of half of the Northern sample are presented. From this data we find, consistent with previous studies, an anti-correlation between FIR luminosity and radio size. Unexpectedly we find that amongst sources which lie slightly above the radio-IR correlation, the excess radio emission is mostly in large scale structure (≥ 1kpc). Studies of the southern COLA sample suggest a strong correlation between having a radio excess and the presence of a compact AGN core, even though the core itself only accounts for small fraction of the excess. We speculate that either the bulk of AGN radio emission is on unexpectedly large scales or that AGN presence is correlated with old starbursts; a result consistent with proposed evolutionary models.
|Item Type:||Book Section|
|Additional Information:||© 2005 American Institute of Physics. Issue Date: 4 August 2005.|
|Subject Keywords:||galaxies; galactic nuclei; radiosources (astronomical); imaging|
|Classification Code:||PACS: 98.54.Ep; 98.62.Js|
|Official Citation:||Preliminary results from the COLAN sample Rodrigo Parra, John Conway, Phil Appleton, and Ylva Pihlstrom, AIP Conf. Proc. 783, 241 (2005), DOI:10.1063/1.2034991|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||11 Aug 2011 19:50|
|Last Modified:||26 Dec 2012 13:28|
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