TY - UNPB
T1 - A panchromatic view of infrared quasars
T2 - excess star formation and radio emission in the most heavily obscured systems
AU - Andonie, Carolina
AU - Alexander, David M.
AU - Rosario, David
AU - Laloux, Brivael
AU - Georgakakis, Antonis
AU - Morabito, Leah K.
AU - Villforth, Carolin
AU - Avirett-Mackenzie, Mathilda
AU - Rivera, Gabriela Calistro
AU - Moro, Agnese Del
AU - Fotopoulou, Sotiria
AU - Harrison, Chris
AU - Lapi, Andrea
AU - Petley, James
AU - Petter, Grayson
AU - Shankar, Francesco
N1 - Accepted for publication in MNRAS. 22 pages, 15 figures, 4 tables
PY - 2022/9/27
Y1 - 2022/9/27
N2 - To understand the Active Galactic Nuclei (AGN) phenomenon and their impact on the evolution of galaxies, a complete AGN census is required; however, finding heavily obscured AGNs is observationally challenging. Here we use the deep and extensive multi-wavelength data in the COSMOS field to select a complete sample of 578 infrared (IR) quasars ($L_{\rm AGN,IR}>10^{45}\rm \: erg\: s^{-1}$) at $z10^{22}\rm \: cm^{-2}$) and identify differences in the average properties between the obscured and unobscured quasars: (1) obscured quasars have star-formation rates $\approx 3$ times higher than unobscured systems for no significant difference in stellar mass and (2) obscured quasars have stronger radio emission than unobscured systems, with a radio-loudness parameter $\approx 0.2 \rm \: dex$ higher. These results are inconsistent with a simple orientation model but in general agreement with either extreme host-galaxy obscuration towards the obscured quasars or a scenario where obscured quasars are an early phase in the evolution of quasars.
AB - To understand the Active Galactic Nuclei (AGN) phenomenon and their impact on the evolution of galaxies, a complete AGN census is required; however, finding heavily obscured AGNs is observationally challenging. Here we use the deep and extensive multi-wavelength data in the COSMOS field to select a complete sample of 578 infrared (IR) quasars ($L_{\rm AGN,IR}>10^{45}\rm \: erg\: s^{-1}$) at $z10^{22}\rm \: cm^{-2}$) and identify differences in the average properties between the obscured and unobscured quasars: (1) obscured quasars have star-formation rates $\approx 3$ times higher than unobscured systems for no significant difference in stellar mass and (2) obscured quasars have stronger radio emission than unobscured systems, with a radio-loudness parameter $\approx 0.2 \rm \: dex$ higher. These results are inconsistent with a simple orientation model but in general agreement with either extreme host-galaxy obscuration towards the obscured quasars or a scenario where obscured quasars are an early phase in the evolution of quasars.
KW - astro-ph.GA
M3 - Preprint
BT - A panchromatic view of infrared quasars
ER -