Service interruption on Monday 11 July from 12:30 to 13:00: all the sites of the CCSD (HAL, EpiSciences, SciencesConf, AureHAL) will be inaccessible (network hardware connection).
Skip to Main content Skip to Navigation
Journal articles

Disk, merger, or outflow? Molecular gas kinematics in two powerful obscured QSOs at z ≥ 3.4

Abstract : We report on the detection of bright CO(4-3) line emission in two powerful, obscured quasars discovered in the SWIRE survey, SW022513 and SW022550 at z ≥ 3.4. We analyze the line strength and profile to determine the gas mass, dynamical mass, and the gas dynamics for both galaxies. In SW022513 we may have found the first evidence for a molecular, AGN-driven wind in the early Universe. The line profile in SW022513 is broad (FWHM=1000 km s-1) and blueshifted by -200 km s-1 relative to systemic (where the systemic velocity is estimated from the narrow components of ionized gas lines, as is commonly done for AGN at low and high redshifts). SW022550 has a more regular, double-peaked profile, which is marginally spatially resolved in our data, consistent with either a merger or an extended disk. The molecular gas masses, 4 × 1010 M, are large and account for <30% of the stellar mass, making these obscured QSOs as gas rich as other powerful CO emitting galaxies at high redshift, i.e., submillimeter galaxies. Our sources exhibit relatively lower star-formation efficiencies compared to other dusty, powerful starburst galaxies at high redshift. We speculate that this could be a consequence of the AGN perturbing the molecular gas.

Based on observations carried out with the IRAM Plateau de Bure Interferometer. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain).

Complete list of metadata
Contributor : Hal Sorbonne Université Gestionnaire Connect in order to contact the contributor
Submitted on : Friday, April 22, 2022 - 3:53:17 PM
Last modification on : Friday, April 22, 2022 - 3:53:20 PM


Publisher files allowed on an open archive



M. Polletta, N. P. H. Nesvadba, R. Neri, A. Omont, S. Berta, et al.. Disk, merger, or outflow? Molecular gas kinematics in two powerful obscured QSOs at z ≥ 3.4. Astronomy & Astrophysics, 2011, 533, ⟨10.1051/0004-6361/201116446⟩. ⟨insu-03645912⟩



Record views


Files downloads