Lack of Correlations between Cold Molecular Gas and AGN Properties in Type 1 AGNs at z ≲ 0.5
Journal article, 2023

We present new NOrthern Extended Millimeter Array (NOEMA) observations of the CO(2-1) emission in eight of the brightest Palomar-Green quasars at z ≲ 0.5 to investigate the role of active galactic nucleus (AGN) feedback in luminous quasars detected at low redshifts. We detect CO(2-1) emission in three objects, from which we derive CO luminosities, molecular gas masses and fractions, and gas depletion times. In combination with data available in the literature, we build a total sample of 138 local type 1 AGNs with CO(2-1) measurements. We compare the AGN properties with the host galaxy molecular gas properties, considering systems nondetected in CO emission. We find that the CO luminosity does not correlate with AGN luminosity and Eddington ratio, while the molecular gas fraction is weakly correlated with Eddington ratio. The type 1 AGNs can be roughly separated into two populations in terms of infrared-to-CO luminosity ratio, with one population presenting values typically found in normal star-forming systems, while the other having lower ratio values, comparable to those measured for starbursts. We find no evidence that AGN feedback rapidly quenches star formation in type 1 AGNs. Our results may imply an underlying the role of host galaxy gravitational instabilities or the fast inflow of cold gas in triggering AGN activity.

Author

Juan Andrés Molina Tobar

Beijing University of Technology

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

J. Shangguan

Max Planck Society

Ran Wang

Beijing University of Technology

Luis C. Ho

Beijing University of Technology

F. E. Bauer

Millennium Institute of Astrophysics

Pontificia Universidad Catolica de Chile

E. Treister

Pontificia Universidad Catolica de Chile

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 950 1 60

Subject Categories

Astronomy, Astrophysics and Cosmology

Atom and Molecular Physics and Optics

DOI

10.3847/1538-4357/acc9b4

More information

Latest update

6/30/2023