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.
HAIKALA L.K., JUVELA M., HARJU J., LEHTINEN K., MATTILA K. and DUMKE M.
Abstract (from CDS):
The feasibility of observing the C18
O(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 H2
O 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 C18
O maxima in the high latitude low mass star forming region CG 12
were mapped in C18
O(3-2) and the data were analyzed together with spectral line data from the SEST. The TMB
(2-1) ratio in the northern C18
O 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, C18
O(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
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.
clouds - ISM molecules - ISM: structure - radio lines - ISM: individual objects: CG 12, NGC5367
Paragr. 3.1: [HJH2006] CG 12-W (Nos CG 12-N, CG 12-S).
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