A Large-Scale Study of H13CO+ and C18O (J = 1 -- 0) in Orion B

Details A Large-Scale Study of H13CO+ and C18O (J = 1 -- 0) in Orion B A Large-Scale Study of H13CO+ and C18O (J = 1 -- 0) in Orion B

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53.1053a&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.53, No. 6, pp. 1053-1062

Astronomy and Astrophysics

Astronomy

12

Ism: Clouds, Ism: Individual (Orion B), Ism: Molecules, Stars: Formation

Scientific paper

We have made a new survey for dense cloud cores in the Orion B region using the NANTEN telescope. Two molecular transitions, the J = 1 -- 0 line of H13CO+ and the J = 1 -- 0 line of 18CO, were used to study the distribution of dense molecular gas with densities of 104 -- 105 cm-3. We detected 19 C18O clumps, and the mass and the size of the C18O clumps ranged from 13 Msolar to 990 Msolar and from 0.26 pc to 0.69 pc, respectively. Among the physical parameters of these 18CO clumps, the molecular column density, N(H2), has been found to be the best indicator of star formation; the molecular column density averaged within a C18O clump shows a good correlation with the IRAS luminosity as LIRAS / Lsolar ∝ N(H2) (cm-2) 4.8 +/- 0.6 (C.C. = 0.96). We also detected 11 H13CO× clumps, whose mass ranges from a few Msolar to 480Msolar. Five of the H13CO× clumps are of smaller mass, and show no indication of massive star formation; they were newly found in this survey. Five of the eleven H13CO× clumps are particularly massive with an average mass of ~ 200 Msolar. It is found that these massive H13CO× clumps exhibit active formation of massive stars, as indicated by associated protostellar IRAS point sources, whose luminosities are 102 -- 104 Lsolar.

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