Evidence of Evolution in the Dense Cores in Massive Star Forming Regions

Details Evidence of Evolution in the Dense Cores in Massive Star Forming Regions Evidence of Evolution in the Dense Cores in Massive Star Forming Regions

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005chjaa...5..363z&link_type=abstract

Chinese Journal of Astronomy and Astrophysics, Volume 5, Issue 4, pp. 363-370 (2005).

Astronomy and Astrophysics

Astrophysics

Scientific paper

The excitation of H2O masers usually needs very high density gas, hence it can serve as a marker of dense gas in HII region. We selected a sample of H2O maser sources from Plume et al. (four with, and four without detected CS(J = 7-6) emission), and observed them in 13CO(J=1-0) and C18O (J=1-0). C18O (J=1-0) emission was detected only in three of the sources with detected CS(J=7-6) emission. An analysis combined with some data in the literature suggests that these dense cores may be located at different evolutionary stages. Multi-line observation study may provide us clues on the evolution of massive star forming regions and the massive stars themselves.

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