Imaging Carbon Monoxide Emission in the Starburst Galaxy NGC 6000 - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




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Abstract: We present measurements of carbon monoxide emission in the central region ofthe nearby starburst NGC 6000 taken with the Submillimeter Array. The J=2-1transition of 12CO, 13CO, and C18O were imaged at a resolution of ~3-x2-450x300 pc. We accurately determine the dynamical center of NGC 6000 atR.AJ2000.0=15h49m49.5s and decJ2000.0=-29d23-13- which agrees with thepeak of molecular emission position. The observed CO dynamics could beexplained in the context of the presence of a bar potential affecting themolecular material, likely responsible for the strong nuclear concentrationwhere more than 85% of the gas is located. We detect a kinematically detachedcomponent of dense molecular gas at relatively high velocity which might befueling the star formation. A total nuclear dynamical mass of 7x10^9 Msun isderived and a total mass of gas of 4.6x10^8 Msun, yielding a Mgas-Mdyn~6%,similar to other previously studied barred galaxies with central starbursts. Wedetermined the mass of molecular gas with the optically thin isotopologue C18Oand we estimate a CO-to-H2 conversion factor XCO=0.4x10^20 cm-2-K km s-1 inagreement with that determined in other starburst galaxies.



Author: Sergio Martin, Matthew R. George, David J. Wilner, Daniel Espada

Source: https://arxiv.org/







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