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Molecular Gas and Star Formation in Local Early–type Galaxies

  • M. Bureau (a1), T. A. Davis (a1), K. Alatalo (a2), A. F. Crocker (a3), L. Blitz (a2), L. M. Young (a4), F. Combes (a5), M. Bois (a6), F. Bournaud (a7), M. Cappellari (a1), R. L. Davies (a1), P. T. de Zeeuw (a8) (a9), P.-A. Duc (a10), E. Emsellem (a6) (a8), S. Khochfar (a11), D. Krajnović (a8), H. Kuntschner (a8), P.-Y. Lablanche (a6), R. M. McDermid (a12), R. Morganti (a13), T. Naab (a14), T. Oosterloo (a13), M. Sarzi (a15), N. Scott (a1), P. Serra (a13) and A. Weijmans (a16)...

Abstract

The molecular gas content of local early-type galaxies is constrained and discussed in relation to their evolution. First, as part of the ATLAS3D survey, we present the first complete, large (260 objects), volume-limited single-dish survey of CO in normal local early-type galaxies. We find a surprisingly high detection rate of 22%, independent of luminosity and at best weakly dependent on environment. Second, the extent of the molecular gas is constrained with CO synthesis imaging, and a variety of morphologies is revealed. The kinematics of the molecular gas and stars are often misaligned, implying an external gas origin in over a third of the systems, although this behaviour is drastically diffferent between field and cluster environments. Third, many objects appear to be in the process of forming regular kpc-size decoupled disks, and a star formation sequence can be sketched by piecing together multi-wavelength information on the molecular gas, current star formation, and young stars. Last, early-type galaxies do not seem to systematically obey all our usual prejudices regarding star formation, following the standard Schmidt-Kennicutt law but not the far infrared-radio correlation. This may suggest a greater diversity in star formation processes than observed in disk galaxies. Using multiple molecular tracers, we are thus starting to probe the physical conditions of the cold gas in early-types.

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Copyright

References

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Cappellari, M., et al. 2011, MNRAS, in press (arXiv:1012.1551)
Crocker, A. F., Bureau, M., Young, L. M., & Combes, F. 2011, MNRAS, 410, 1197
Davis, T. A., et al. 2011, MNRAS, submitted
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Emsellem, E., et al. 2007, MNRAS, 379, 401
Krips, M., Crocker, A. F., Bureau, M., Combes, F., & Young, L. M. 2010, MNRAS, 407, 2261
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Keywords

Molecular Gas and Star Formation in Local Early–type Galaxies

  • M. Bureau (a1), T. A. Davis (a1), K. Alatalo (a2), A. F. Crocker (a3), L. Blitz (a2), L. M. Young (a4), F. Combes (a5), M. Bois (a6), F. Bournaud (a7), M. Cappellari (a1), R. L. Davies (a1), P. T. de Zeeuw (a8) (a9), P.-A. Duc (a10), E. Emsellem (a6) (a8), S. Khochfar (a11), D. Krajnović (a8), H. Kuntschner (a8), P.-Y. Lablanche (a6), R. M. McDermid (a12), R. Morganti (a13), T. Naab (a14), T. Oosterloo (a13), M. Sarzi (a15), N. Scott (a1), P. Serra (a13) and A. Weijmans (a16)...

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