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Connecting black holes and galaxies in faint radio populations at cosmic noon

Published online by Cambridge University Press:  04 June 2020

Stacey Alberts Open the ORCID record for Stacey Alberts [Opens in a new window] ,
Wiphu Rujopakarn  and
George H. Rieke Open the ORCID record for George H. Rieke [Opens in a new window]
Stacey Alberts
Affiliation:
Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA email: salberts@email.arizona.edu
Wiphu Rujopakarn
Affiliation:
Department of Physics, Faculty of Science, Chulalongkorn University 254 Phayathai Road, Pathumwam, Bangkok 10330, Thailand
George H. Rieke
Affiliation:
Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA email: salberts@email.arizona.edu
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Abstract

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We leverage new ultra-deep, high resolution, multi-frequency radio imaging at 6 and 3 GHz with the unique datasets available in the GOODS-S/HUDF region in order to assess the AGN fraction in a faint radio-selected sample. For AGN identification, we adopt a multi-wavelength approach, combining X-ray and (mid-)infrared (IR) selections with radio identification such as X-ray to radio excess, flat radio spectral slopes, and the radio-IR correlation. We identify AGN in 43% of our radio sample, yielding an AGN source density of ∼ 1 arcmin−2. This AGN fraction is likely underestimated, as 1) our shallower 3 GHz data is biased against flat radio spectrum sources and 2) all of our selections may be biased against the most heavily obscured AGN. The James Webb Space Telescope’s Mid-Infrared Instrument (MIRI) will address the latter issue and we briefly outline our Cycle 1 Guaranteed Time Observation (GTO) program to search for heavily obscured AGN.

Keywords

Galaxy: evolutionradio continuum: galaxiesgalaxies: active
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S352: Uncovering Early Galaxy Evolution in the ALMA and JWST Era , June 2019 , pp. 132 - 137
Copyright
© International Astronomical Union 2020

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