Herschel-ATLAS: The connection between star formation and AGN activity in radio-loud and radio-quiet active galaxies
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, withHerschel 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 |
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Uncontrolled Keywords | Galaxies: active; Infrared: galaxies |
Date Deposited | 26 Jul 2024 17:50 |
Last Modified | 26 Jul 2024 17:50 |
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Read more research from the creator(s):
- Gürkan, G.
- Hardcastle, M.J.
- Jarvis, M. J.
- Smith, Daniel
- Bourne, N.
- Dunne, L.
- Maddox, S.
- Ivison, R. J.
- Fritz, J.
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