Astrophys. J., 887, 24-24 (2019/December-2)
Resolving the interstellar medium in ultraluminous infrared QSO hosts with ALMA.
TAN Q.-H., GAO Y., KOHNO K., XIA X.-Y., OMONT A., HAO C.-N., MAO S.-D., DADDI E., SHI Y., ZHAO Y.-H. and COX P.
Abstract (from CDS):
We present ALMA observations of the CO(1-0) line and 3 mm continuum emission in eight ultraluminous infrared (IR) quasi-stellar objects (QSOs) at z = 0.06-0.19. All eight IR QSO hosts are clearly resolved in their CO molecular gas emission with a median source size of 3.2 kpc, and seven out of eight sources are detected in 3 mm continuum, which is found to be more centrally concentrated with respect to molecular gas with sizes of 0.4-1.0 kpc. Our observations reveal a diversity of CO morphology and kinematics for the IR QSO systems, which can be roughly classified into three categories: rotating gas disk with ordered velocity gradient, compact CO peak with disturbed velocity, and multiple CO distinct sources undergoing a merger between a luminous QSO and a companion galaxy separated by a few kpc. The molecular gas in three of the IR QSO hosts is found to be rotation-dominated with a ratio of the maximum rotation velocity to the local velocity dispersion of Vrot/σ = 4-6. Basic estimates of the dynamical masses within the CO-emitting regions give masses between 7.4 x 109 and 6.9 x 1010 M☉. We find an increasing trend between black hole mass accretion rate and star formation rate (SFR) over 3 orders of magnitude in far-IR luminosity/SFR, in line with the correlation between QSO bolometric luminosity and star formation activity, indicative of a likely direct connection between active galactic nuclei and star formation activity over galaxy evolution timescales.
© 2019. The American Astronomical Society. All rights reserved.
Starburst galaxies - AGN host galaxies
Table 1: the part of galaxies IRAS FHHMMS+DDMMW, IRAS FHHMMS+DDMMWW and IRAS FHHMMS+DDMMWWN are not in SIMBAD.
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