SIMBAD references

2004BaltA..13..419T - Baltic Astronomy, 13, 419-423 (2004/August-0)

H13CO+ dense molecular condensations in nearby star-forming regions.

TACHIHARA K., YAMAMOTO H., ONISHI T., MIZUNO A. and FUKUI Y.

Abstract (from CDS):

Several nearby star-forming regions (SFRs) have been uniformly searched for dense condensations of C18O with the NANTEN radio telescope. After that, the C18O cores in the Taurus, Ophiuchus North, Lupus and Chamaeleon star-forming regions have been observed in H13CO+, which traces much denser parts of the condensations - up to n(H2) > 105 cm–3. The H13CO+ cores have been found not only in the active SFRs, but also in the regions of low activity, such as the Oph North region. The detection rates of these cores are similar in both regions. However, the H13CO+ cores in Oph North are of smaller mass and density, and they seem to be immature to form stars. It is suggested that their time-scale in the starless phase is ∼106 yr, i.e., significantly longer than the free-fall time.

Abstract Copyright:

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

Simbad objects: 9

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2021.06.16-12:52:05

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