Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...662.1043s&link_type=abstract
The Astrophysical Journal, Volume 662, Issue 2, pp. 1043-1051.
Astronomy and Astrophysics
Astronomy
1
Ism: Clouds, Ism: Individual: Alphanumeric: W3, Ism: Individual (Afgl 333)
Scientific paper
We have mapped two massive clumps, clump A and B, of the AFGL 333 cloud in the N2H+ J=1-0, CCS JN=43-32, HC3N J=5-4, and NH3 (J,K)=(1,1) and (2,2) lines with the Nobeyama Radio Observatory 45 m telescope. Intense N2H+ emission comes from the two clumps, and its overall distribution is similar to that of C18O J=1-0. On the other hand, the CCS and HC3N emissions are more intense toward clump B than toward clump A. Thus, the column density ratios of [CCS]/[N2 H+] and [HC3N]/[N2H+] tend to be higher toward clump B than toward clump A, indicating that clump B is younger than clump A. This is supported by a fact that the 2MASS sources with H-K>2 and the Spitzer 24 μm sources are mostly associated with clump A, whereas only a few such sources exist in clump B. Clump B involves a few dense cores that are dark in the mid-infrared maps. Such cores are thought to be good candidates of starless cores for high- or intermediate-mass stars.
Oka Tomoharu
Sakai Takeshi
Yamamoto Satoshi
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