Computer Science
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009eimw.confe..28h&link_type=abstract
"The Evolving ISM in the Milky Way and Nearby Galaxies, The Fourth Spitzer Science Center Conference, Proceedings of the confere
Computer Science
Galaxies: Ism, Ism: Structure, Galaxies: Individual: M33, Ism: Clouds
Scientific paper
We report our latest findings on the volume densities of molecular hydrogen in Giant Molecular Clouds (GMCs) associated with photodissociation regions (PDRs) in the nearby galaxy M33 (the Triangulum galaxy), using HI continuum, FUV- and metallicity data. The morphology of the atomic hydrogen distribution is similar to what is expected for PDRs, since the HI is seen surrounding bright FUV sources. Potential PDRs that we detect, in which dissociating photons dominate the radiation field, have sizes in the order of 100 parsec. Complexes of young, hot stars are responsible for these PDRs. They create a 'blanket' of photodissociated HI. This HI can be converted into H_2 again, recycling the atomic gas. Verification of the PDR scheme that we are testing depends ciritically on the spatial resolution of the M33 data. To this end we investigated potential PDRs of M33 both at a resolution of about 100 parsec as well as 30 parsec, using new high resolution M33 radio data kindly provided by David Thilker and Robert Braun. We also used publicly available Galex UV data at a comparable resolution. Earlier results for M81 (Heiner et al., 2008) and M83 (Heiner et al., in prep.) had the right resolution to apply our method, but lacked the spatial resolution to truly discern any structure. We analyzed HII region BCLMP 0288 and find that lower resolution analysis would overestimate the total hydrogen volume density. The value we find at the full resolution is 5 cm}-3.
Allen Rosalind J.
Heiner Jonathan S.
van der Kruit Pieter Corijnus
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