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Published 2007 | Published
Book Section - Chapter Open

The Star-formation History of the Universe as Revealed from Deep Radio Observations of the 13^H XMM-Newton/Chandra Deep Field

Abstract

Discerning the exact nature of the faint (sub-mJy) radio population has been historically difficult due to the low luminosity of these sources at most wavelengths. Using deep observations from Chandra/XMM-Newton/Spitzer and ground based follow up we are able to disentangle the AGN and star- forming populations for the first time in a deep multi-frequency GMRT/VLA/MERLIN Survey. The many diagnostics include radio luminosity, morphology, radio to mid-IR flux density ratios, radio to optical flux density ratios and radio spectral indices. Further diagnostics, e.g. optical spectra, X-ray spectra/hardness ratios, IR colours indicate the presence of the AGN independent of whether the radio emission is powered by AGN or star-formation. We are able to examine the star-formation history of the universe up to z = 2.5 in a unique way based on an unbiased star-formation rate indicator, radio luminosity. This work provides an alternative perspective on the distribution of star-formation by mass, "downsizing" and allows us to examine the prevalence of AGN in star-bursts.

Additional Information

© 2007 Astronomical Society of the Pacific. We would like to thank Jose Afonso and the LOC for organising a timely, interesting and thoroughly enjoyable meeting. We thank the staff of GMRT for their help in obtaining and reducing the data. We especially thank Niruj Mohan for his help in all matters. We look forward to more Pages.

Attached Files

Published - Seymour2007p8540At_The_Edge_Of_The_Universe_Latest_Results_From_The_Deepest_Astronomical_Surveys.pdf

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Seymour2007p8540At_The_Edge_Of_The_Universe_Latest_Results_From_The_Deepest_Astronomical_Surveys.pdf

Additional details

Created:
August 19, 2023
Modified:
January 13, 2024