Physical and chemical properties of massive clumps in the AFGL 333 cloud

Takeshi Sakai, Tomoharu Oka, Satoshi Yamamoto

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


We have mapped two massive clumps, clump A and B, of the AFGL 333 cloud in the N2H+ J = 1-0, CCS JN = 43-3 2, HC3N J = 5-4, and NH3 (J, K) = (1,1) and (2,2) lines with the Nobeyama Radio Observatory 45 m telescope. Intense N 2H+ 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.

Original languageEnglish
Pages (from-to)1043-1051
Number of pages9
JournalAstrophysical Journal
Issue number2 I
Publication statusPublished - 2007 Jun 20
Externally publishedYes


  • ISM: clouds
  • ISM: individual (W3, AFGL 333)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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