The ATLAS3D project - XVIII. CARMA CO imaging survey of early-type galaxies
Katherine Alatalo, Timothy A. Davis, Martin Bureau, Lisa M. Young, Leo, Blitz, Alison F. Crocker, Estelle Bayet, Maxime Bois, Fr\'ed\'eric Bournaud,, Michele Cappellari, Roger L. Davies, P. T. de Zeeuw, Pierre-Alain Duc, Eric, Emsellem, Sadegh Khochfar, Davor Krajnovic

TL;DR
This study presents a comprehensive survey of molecular gas in early-type galaxies, revealing diverse morphologies and a correlation between galaxy mass and gas distribution, with implications for galaxy evolution.
Contribution
It provides the largest, most detailed CO imaging survey of early-type galaxies, linking molecular gas morphology to galaxy properties and merger history.
Findings
Molecular gas and dust distributions are well aligned in early-type galaxies.
Galaxies show diverse CO morphologies, including discs, rings, and disrupted structures.
Most massive galaxies tend to host molecular gas in disc form.
Abstract
We present the Combined Array for Research in Millimeter Astronomy (CARMA) ATLAS3D molecular gas imaging survey, a systematic study of the distribution and kinematics of molecular gas in CO-rich early-type galaxies. Our full sample of 40 galaxies (30 newly mapped and 10 taken from the literature) is complete to a 12CO(1-0) integrated flux of 18.5 Jy km/s, and it represents the largest, best-studied sample of its type to date. A comparison of the CO distribution of each galaxy to the g-r color image (representing dust) shows that the molecular gas and dust distributions are in good agreement and trace the same underlying interstellar medium. The galaxies exhibit a variety of CO morphologies, including discs (50%), rings (15%), bars+rings (10%), spiral arms (5%), and mildly (12.5%) and strongly (7.5%) disrupted morphologies. There appear to be weak trends between galaxy mass and CO…
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