TY - JOUR
T1 - Physical and chemical properties of massive clumps in the AFGL 333 cloud
AU - Sakai, Takeshi
AU - Oka, Tomoharu
AU - Yamamoto, Satoshi
PY - 2007/6/20
Y1 - 2007/6/20
N2 - 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.
AB - 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.
KW - ISM: clouds
KW - ISM: individual (W3, AFGL 333)
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U2 - 10.1086/518402
DO - 10.1086/518402
M3 - Article
AN - SCOPUS:34547406807
VL - 662
SP - 1043
EP - 1051
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2 I
ER -