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Herschel-ATLAS: the connection between star formation and AGN activity in radio-loud and radio-quiet active galaxies

Guerkan, G, Hardcastle, M. J., Jarvis, M. J., Smith, D. J. B., Bourne, N., Dunne, Loretta, Maddox, Steve, Ivison, R. J. and Fritz, J. 2015. Herschel-ATLAS: the connection between star formation and AGN activity in radio-loud and radio-quiet active galaxies. Monthly Notices of the Royal Astronomical Society 452 (4) , pp. 3776-3794. 10.1093/mnras/stv1502

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Abstract

We examine the relationship between star formation and active galactic nuclei (AGN) activity by constructing matched samples of local (0 < z < 0.6) radio-loud and radio-quiet AGN in the Herschel-Astrophysical Terahertz Large Area Survey fields. Radio-loud AGN are classified as high-excitation and low-excitation radio galaxies using their emission lines and WISE 22-μm luminosity. AGN accretion and jet powers in these active galaxies are traced by [O iii] emission-line and radio luminosity, respectively. Star formation rates (SFRs) and specific star formation rates (SSFRs) were derived using Herschel 250-μm luminosity and stellar mass measurements from the Sloan Digital Sky Survey–Max Planck Institute for Astrophysics-John Hopkins University catalogue. In the past, star formation studies of AGN have mostly focused on high-redshift sources to observe the thermal dust emission that peaks in the far-infrared, which limited the samples to powerful objects. However, with Herschel we can expand this to low redshifts. Our stacking analyses show that SFRs and SSFRs of both radio-loud and radio-quiet AGN increase with increasing AGN power but that radio-loud AGN tend to have lower SFR. Additionally, radio-quiet AGN are found to have approximately an order of magnitude higher SSFRs than radio-loud AGN for a given level of AGN power. The difference between the star formation properties of radio-loud and -quiet AGN is also seen in samples matched in stellar mass

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Additional Information: First published online August 7, 2015
Publisher: Oxford University Press
ISSN: 0035-8711
Date of Acceptance: 6 July 2015
Last Modified: 16 Sep 2019 13:02
URI: http://orca.cardiff.ac.uk/id/eprint/78905

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