Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.8417m&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #84.17; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
We present observations of the dense molecular gas tracers HCN(1-0), CS(2-1), HNC(1-0) and HCO+(1-0) with the FCRAO 14m towards 10 high-mass star-forming dense cores that have been observed by Spitzer. In each of the cores, we sample them in the step of 25" with the FCRAO 14m and convolve the infrared images to the same as the FCRAO beamsize ( 60"). Then we compare the fluxes of the dense gas tracers of HCN(1-0), CS(2-1), HNC(1-0) and HCO+(1-0) with the fluxes of 24 micron (M1) and 8 micron (I4) at the same positions. We fit the correlations of the fluxes between the dense gas tracers and that of the infrared emission. The most important result is the correlation between the dense gas tracers and the infrared emission is non-linear in each of the sources with a wide range of the slope from 0.2 to 1.7. So the linear correlation derived from galaxies and dense cores globally is not applicable in the local star formation region inside the GMC dense cores. With our maps of the star forming cores with HCN(1-0), CS(2-1), HNC(1-0) and HCO+(1-0), we find that in most of the cores the emission regions of HCN(1-0) and CS(2-1) are more compact than that of HCO+(1-0), which confirm that HCN and CS are the better dense molecular gas tracers than HCO+.
Gao Yanfang
Ma Hongjun
Wu Jackson
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