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        The ATLAS 3D project - XI : Dense molecular gas properties of CO-luminous early-type galaxies

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        906091.pdf (PDF, 590Kb)
        Author
        Crocker, A.
        Krips, M.
        Bureau, M.
        Young, L.M.
        Davis, T.A.
        Bayet, E.
        Alatalo, K.
        Blitz, L.
        Bois, M.
        Bournaud, F.
        Cappellari, M.
        Davies, R. L.
        de Zeeuw, P.T.
        Duc, P.A.
        Emsellem, E.
        Khochfar, S.
        Krajnović, D.
        Kuntschner, H.
        Lablanche, Pierre-Yves
        McDermid, Richard M.
        Morganti, Raffaella
        Naab, Thorsten
        Oosterloo, Tom
        Sarzi, Marc
        Scott, N.
        Serra, P.
        Weijmans, Anne-Marie
        Attention
        2299/8039
        Abstract
        Surveying 18 12CO-bright galaxies from the ATLAS 3D early-type galaxy sample with the Institut de Radio Astronomie Millimétrique (IRAM) 30-m telescope, we detect 13CO(1-0) and 13CO(2-1) in all 18 galaxies, HCN(1-0) in 12/18 and HCO +(1-0) in 10/18. We find that the line ratios 12CO(1-0)/ 13CO(1-0) and 12CO(1-0)/HCN(1-0) are clearly correlated with several galaxy properties: total stellar mass, luminosity-weighted mean stellar age, molecular-to-atomic gas ratio, dust temperature and dust morphology. We suggest that these correlations are primarily governed by the optical depth in the 12CO lines; interacting, accreting and/or starbursting early-type galaxies have more optically thin molecular gas while those with settled dust and gas discs host optically thick molecular gas. The ranges of the integrated line intensity ratios generally overlap with those of spirals, although we note some outliers in the 12CO(1-0)/ 13CO(1-0), 12CO(2-1)/ 13CO(2-1) and HCN/HCO +(1-0) ratios. In particular, three galaxies are found to have very low 12CO(1-0)/ 13CO(1-0) and 12CO(2-1)/ 13CO(2-1) ratios. Such low ratios may signal particularly stable molecular gas which creates stars less efficiently than 'normal' (i.e. below Schmidt-Kennicutt prediction), consistent with the low dust temperatures seen in these galaxies. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.
        Publication date
        2012-04
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1111/j.1365-2966.2011.20393.x
        Other links
        http://hdl.handle.net/2299/8039
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