NRO legacy project: M 33 all disk survey of Giant Molecular Clouds (GMCs) with NRO-45m and ASTE-10m telescopes

Details NRO legacy project: M 33 all disk survey of Giant Molecular Clouds (GMCs) with NRO-45m and ASTE-10m telescopes NRO legacy project: M 33 all disk survey of Giant Molecular Clouds (GMCs) with NRO-45m and ASTE-10m telescopes

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011eas....52..125t&link_type=abstract

EAS Publications Series, Volume 52, 2011, pp.125-128

Computer Science

Scientific paper

We present the results of the Nobeyama Radio Observatory (NRO) M 33 All Disk (30' × 30', or 7.3 kpc × 7.3 kpc) Survey of Giant Molecular Clouds (NRO MAGiC) based on 12CO(J = 1-0) observations using the NRO 45-m telescope and 12CO(J = 3-2) observations using the ASTE 10-m telescope. The spatial resolution of the resultant 12CO(J = 1-0) map is 193, corresponding to 81 pc, which is sufficient to identify each Giant Molecular Cloud (GMC) in the disk. We found clumpy structures with a typical spatial scale of ~100 pc, corresponding to GMCs, and no diffuse, smoothly distributed component of molecular gas at this sensitivity. We obtained a map of the molecular fraction, fmol = ΣH2/(ΣHi + ΣH2), at a 100-pc resolution. This is the first fmol map covering an entire galaxy with a GMC-scale resolution. The correlation between fmol and gas surface density shows two distinct sequences. The presence of two correlation sequences can be explained by differences in metallicity, i.e., higher (~2-fold) metallicity in the central region (r < 1.5 kpc) than in the outer parts. Alternatively, differences in scale height can also account for the two sequences, i.e., increased scale height toward the outer disk.

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