The molecular morphology of the SAB galaxy NGC 4736

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Maps, Galactic Structure, Molecular Clouds, Radio Spectra, Spiral Galaxies, Astronomical Models, Carbon Monoxide, Emission Spectra, Galactic Bulge, Galactic Nuclei, Interstellar Matter

Scientific paper

The first mapping observations of molecular clouds in NGC 4736 are presented. A central hole in the molecular distribution is found, with the observed peak in CO emission at a radius of 22 arcsec from the center. If this distribution is azimuthally symmetric, the ring contains an H2 mass of 100 million solar masses, while the H I mass in the same region is 10 million solar masses. The CO peaks are coincident with the inner portion of a ring of H I. The extent of the central CO hole coincides with the region in the galaxy where the light distribution is dominated by the contribution from the nuclear bulge, as was found previously in several Sb galaxies. The fraction of mass in the ISM in this galaxy, about one percent, is lower than that found in any other galaxy in which CO has been detected. This is due to a very small amount of mass in the atomic and molecular clouds.

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