Molecular gas properties of the most isolated galaxies
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Lisenfeld, U.; et al. Molecular gas properties of the most isolated galaxies [póster]. In: Conference "Galaxies in Isolation: exploring nature us nurture", Granada, may 12-15, 2009. [http://hdl.handle.net/10481/28422]
The AMIGA project: The role of nature vs. nurture for the properties and evolution of galaxies is still an open question. In order to find answers, it is crucial to have a well-selected sample of isolated galaxies as a baseline and comparison. We built, refined and analised such a sample in the project AMIGA ("Analysis of the Interstellar Medium of Isolated GAlaxies”, http://www.iaa.es/AMIGA.html). The sample is based on the Catalogue of Isolated Galaxies (CIG) by Karanchenseva (1978) and the database (containing optical magnitude, Hα, far-infrared, radio continuum, HI and CO) enables us to characterize the properties of the star formation and interstellar medium.The CO data: We present CO data for 276 AMIGA galaxies, obtained to a large extent (189 galaxies) from own observations in addition to data from the literature. This sample enables us to characterize the molecular gas content of isolated galaxies.Comparison to other wavelengths: We show the comparison of the total molecular gas mass to the blue luminosity and the atomic gas mass. The molecular gas mass and the blue luminosity show a good correlation which can serve as a baseline to define the extected molecular gas content in a galaxy in the absence of interaction. The atomic gas mass is higher than the molecular gas mass for all Hubble types, and the ratio of the molecular-to-atomic mass ratio decreases towards late Hubble type.