Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.108b&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Other
Scientific paper
We have investigated with high angular resolution the NH_3/N_2H+ ratio in a sample of intermediate/high-mass star forming regions in order to study whether the differences seen in NH_3 and N_2H+ are related to the chemical evolution of dense gas. Our sample contains cores in different evolutionary stages, from pre-protostellar core candidates to protostellar cores harboring hot molecular cores and UCHII regions in the process of clearing up its molecular material. We found significant differences in the NH_3/N_2H+ between pre-protostellar and protostellar cores, being higher during the pre-protostellar phase. What is more, we found an evolutionary sequence of the NH_3/N_2H+ ratio. Initially, during the pre-protostellar phase the NH_3/N_2H+ seems to decrease as the core approaches the onset of star formation due to a golden period of NH_3 observed in this phase. On the other hand, we found some hints of dense gas evolution during the protostellar phase, starting with a decreasing trend of the NH_3/N_2H+ ratio as a consequence of a golden period of N_2H+ until some point that the NH_3/N_2H+ increases considerably as a consequence of the temperature increase and/or molecular outflow interaction.
Busquet Gemma
Estalella Robert
Ho Pak Tung
Palau Aina
Viti Serena
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