SIMBAD references

1995A&AS..109..333P - Astron. Astrophys., Suppl. Ser., 109, 333-340 (1995/February-0)

H13CN, H13CO+, HCN and HCO+ observations of dense gas in galactic molecular clouds.

PIROGOV L., ZINCHENKO I., LAPINOV A., MYSHENKO V. and SHUL'GA V.

Abstract (from CDS):

The results of the observations of several galactic dense molecular cloud cores in the J=1-0 H13CN, H13CO+, HCN and HCO+ lines along with the J=1-0 HCN observations of some high-latitude clouds are presented. In the optically thin approximation the H13CN and H13CO+ column densities (N) are evaluated. HCN and HCO+ column densities are derived from N(H13CN) and N(H13CO+) using the [12C]/[13C] ratios for each cloud calculated from its galactocentric dependence. HCN abundances are found for two objects. The H13CO+, HCO+ and HCN emission region sizes are estimated for some cores. HCO+ and H13CO+ model calculations for S140 show that either the [HCO+]/[H13CO+] abundance ratio is rather low, ∼30, or the object has inhomogeneous structure. The J=1-0 HCN line was detected towards MBM 55B high-latitude cloud. HCN column density in this source is N(HCN)≥1011cm–2, the HCN abundance is X(HCN)>10–10.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: clouds - ISM: molecules - radio lines: ISM

Simbad objects: 20

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