SIMBAD references

2011A&A...533A..20P - Astronomy and Astrophysics, volume 533A, 20-20 (2011/9-1)

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


Abstract (from CDS):

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=1000km/s) and blueshifted by -200km/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, 4x1010M, 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.

Abstract Copyright:

Journal keyword(s): galaxies: high-redshift - galaxies: active - submillimeter: galaxies - submillimeter: ISM - quasars: general - galaxies: evolution

CDS comments: In ref list Danielson et al. 2010 MNRAS 1565 is a aprobable misprint for Danielson et al. 2011MNRAS.410.1687D

Simbad objects: 16

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