SIMBAD references

2006A&A...454L..71H - Astronomy and Astrophysics, volume 454, L71-74 (2006/8-1)

C18O (3-2) observations of the Cometary Globule CG 12: a cold core and a C18O hot spot.


Abstract (from CDS):

The feasibility of observing the C18O(3-2) spectral line in cold clouds with the APEX telescope has been tested. As the line at 329.330GHz lies in the wing of a strong atmospheric H2O absorption it can be observed only at high altitude observatories. Using the three lowest rotational levels instead of only two helps to narrow down the physical properties of dark clouds and globules. The centres of two C18O maxima in the high latitude low mass star forming region CG 12 were mapped in C18O(3-2) and the data were analyzed together with spectral line data from the SEST. The TMB(3-2)/TMB(2-1) ratio in the northern C18O maximum, CG 12-N, is 0.8, and in the southern maximum, CG 12-S, ∼2. CG 12-N is modelled as a 120" diameter (0.4pc) cold core with a mass of 27M. A small size maximum with a narrow, 0.8km/s, C18O(3-2) spectral line with a peak temperature of TMB∼11K was detected in CG 12-S. This maximum is modelled as a 60"-80" diameter (∼0.2pc) hot (80K≲Tex≲200K) ∼1.6M clump. The source lies on the axis of a highly collimated bipolar molecular outflow near its driving source. This is the first detection of such a compact, warm object in a low mass star forming region.

Abstract Copyright:

Journal keyword(s): clouds - ISM molecules - ISM: structure - radio lines - ISM: individual objects: CG 12, NGC5367

Nomenclature: Paragr. 3.1: [HJH2006] CG 12-W (Nos CG 12-N, CG 12-S).

Simbad objects: 8

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