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arXiv · 1107.2129

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

M. Polletta·N. P. H. Nesvadba·R. Neri·A. Omont·S. Berta·J. Bergeron
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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) and blueshifted by -200 km/s 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, 4x10^10 Msun, 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.

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M. Polletta, N. P. H. Nesvadba, R. Neri, A. Omont, S. Berta, J. Bergeron. 2011-07-11. Disk, merger, or outflow ? Molecular gas kinematics in two powerful obscured QSOs at z>3.4. https://doi.org/10.1051/0004-6361/201116446

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