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Tuesday 8 June at 1pm @ JAC
Paul Ruffle - UMIST
"Metal-poor Molecular Gas in Edge Cloud 2"
ABSTRACT: "Edge Cloud 2 (EC2) is the most
distant star forming molecular cloud in
the Milky Way. It has an associated HII region excited by a metal
depleted early B star, that appears to have triggered star formation in
EC2. With the properties of irregular dwarf galaxies, EC2 is unique in
representing an environment similar to the primordial gas from which the
Milky Way formed. Our own observations in EC2 have searched for many
species, and found an under abundance of nitrogen-bearing molecules,
which may be related to the lack of stellar processing at such large
Galactocentric distances. We are extending our observations to higher
frequency at the JCMT to better trace the dense gas associated with star
formation, and to constrain molecular and elemental abundances, density,
temperature, and column densities. We are also developing a chemical
kinetic model to determine age, chemical evolution and constrain
elemental abundances, comparing our results with those in other dwarf
galaxies."
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