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Article Dans Une Revue The Astrophysical Journal Année : 2019

Resolving the Interstellar Medium in Ultraluminous Infrared QSO Hosts with ALMA

Qing-Hua Tan
  • Fonction : Auteur
Yu Gao
  • Fonction : Auteur
Kotaro Kohno
Xiao-Yang Xia
  • Fonction : Auteur
Alain Omont
Cai-Na Hao
  • Fonction : Auteur
Shu-De Mao
  • Fonction : Auteur
Emanuele Daddi
Yong Shi
  • Fonction : Auteur
Ying-He Zhao
  • Fonction : Auteur

Résumé

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 V rot/σ = 4-6. Basic estimates of the dynamical masses within the CO-emitting regions give masses between 7.4 × 109 and 6.9 × 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.

Dates et versions

hal-03630629 , version 1 (05-04-2022)

Identifiants

Citer

Qing-Hua Tan, Yu Gao, Kotaro Kohno, Xiao-Yang Xia, Alain Omont, et al.. Resolving the Interstellar Medium in Ultraluminous Infrared QSO Hosts with ALMA. The Astrophysical Journal, 2019, 887, ⟨10.3847/1538-4357/ab50be⟩. ⟨hal-03630629⟩
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