Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.369v&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
In this work, we present our molecular line data for southern infrared dark clouds (IRDCs) and the first results of chemical modeling for these objects. Using the 22-m Mopra radio telescope, we performed observations toward 15 IRDCs in 13 molecular species. Where possible, we calculated molecular abundances. We uncovered a tendency for IRDCs to have molecular abundances similar to those in low-mass pre-stellar cores. This similarity may indicate similar chemical composition at the earliest stages of low- and high-mass stars and their close evolutionary status. However, for the N_2H^+ and HCO^+ species, there is a tendency for higher mean abundances in IRDCs compared with low-mass cores. To explain these features, we used chemical models including gas-phase reactions and accretion and desorption onto/from grains. Since the molecular line information for IRDC has been limited until recently, a comparison between observation and the results of realistic chemical models for IRDCs has been difficult to perform. Our Mopra data now allow us to study chemical evolution at the early stages of massive stars in more detail and reconstruct the physical conditions and evolutionary status of IRDCs.
Beuther Henrick
Henning Th
Herbst Eric
Linz Hendrik
Vasyunina Tatiana
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