1999AJ....118..990Y

Query : 1999AJ....118..990Y

1999AJ....118..990Y - Astron. J., 118, 990-996 (1999/August-0)

HCN in cloud cores: a good tracer of class 0 young stellar objects.

YUN J.L., MOREIRA M.C., AFONSO J.M. and CLEMENS D.P.

Abstract (from CDS):

We have conducted an HCN (J=1-0) survey of 37 star-forming and quiescent dense cloud cores. HCN emission was detected toward 31 of the 33 cores containing embedded point sources, with only weak or no HCN detection among four starless sources. We find that the J=1-0 transition of the HCN molecule is particularly well suited for revealing the early stages of star formation in molecular clouds. In the sample of star-forming cores, there is excellent spatial coincidence (better than 7") between the position of the peak integrated HCN emission and the location of the associated young stellar object (YSO). Furthermore, emission strength in this HCN transition is well correlated with the YSO class: Class 0 and Class I YSOs are preferentially detected. Detecting strong (>1 K km.s–1) HCN emission from a molecular cloud core indicates the presence of an embedded YSO and thus, indirectly, of a collapsing core. In addition, detection of very strong (>3 K km.s–1) HCN emission implies an 80% likelihood of the presence of an embedded Class 0 YSO.

Abstract Copyright: ∼

Journal keyword(s): ISM: Clouds - ISM: Molecules - Stars: Formation

Simbad objects: 39

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Number of rows : 39
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 V* T Tau TT* 04 21 59.4319873992 +19 32 06.432393336   11.22 10.12 9.80   K0IV/Ve 1404 1
2 2MASS J04314444+1808315 Y*O 04 31 44.44680 +18 08 31.5384           ~ 168 0
3 LDN 1527 DNe 04 39 53 +25 45.0           ~ 635 0
4 NAME RNO 43 FIR HH 05 32 23.0 +12 49 54           ~ 46 0
5 [MCK88] NGC 2024 FIR 5 cor 05 41 44.6 -01 55 38           ~ 93 0
6 HGBS J054608.3-001044 Y*O 05 46 08.8 -00 10 47           ~ 92 0
7 [DB2002b] G196.13-9.17 MoC 05 47 13 +10 26.5           ~ 8 0
8 NAME Mon OB1 G PoC 06 41 12 +09 55.6           ~ 107 0
9 IRAS 08124-3422 IR 08 14 25.1 -34 31 13           ~ 9 0
10 IRAS 08261-5100 MoC 08 27 38.9 -51 10 38           ~ 29 0
11 IRAS 08337-4028 MIR 08 35 31.00392 -40 38 24.8604           ~ 20 0
12 NAME BHR 71 MM HII 12 01 37.1 -65 08 54           ~ 43 0
13 NSV 19435 V* 12 37 33.9198798744 -69 27 05.177704860     14.8     ~ 10 1
14 Sandqvist 160 DNe 13 06.9 -77 01           ~ 41 0
15 PSCz Q13036-7644 Y*O 13 07 36.89 -77 00 09.7           ~ 39 1
16 IRAS 13224-5928 IR 13 25 44.64 -59 43 50.9           ~ 11 0
17 V* RU Lup TT* 15 56 42.3108692112 -37 49 15.473946900 9.27 10.07 9.60     K7/M0e 469 0
18 [SYS98] 160257.9-454808 Y*O 16 06 31.7 -45 56 11           ~ 4 0
19 NAME VLA 1623-243 Y*O 16 26 26.42 -24 24 30.0           ~ 404 0
20 [SSG2006] MMS002 smm 16 26 26.50 -24 24 30.9           ~ 241 0
21 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1252 1
22 IRAS 16289-4449 Or* 16 32 32.19264 -44 55 30.6552       15.95   ~ 137 1
23 IRAS 17012-3603 MIR 17 04 34.68048 -36 07 20.3736           ~ 5 0
24 [SYS98] 171542.9-321257 Y*O 17 18 57.4 -32 16 04           ~ 6 0
25 IRAS 17159-3324 Y*O 17 19 11.154 -33 27 17.94           ~ 3 0
26 [SYS98] 171716.1-431655 Y*O 17 20 51.7 -43 19 52           ~ 7 0
27 IRAS 17181-4405 IR 17 21 46.9 -44 08 42           ~ 10 0
28 IRAS 17193-4319 IR 17 22 54.8 -43 22 13           ~ 7 0
29 [DB2002b] G7.38+4.10 MoC 17 47 01 -20 30.5           ~ 7 0
30 TGU H2132 P1 MoC 17 48 01 -43 43.2           ~ 12 0
31 [DB2002b] G346.19-11.74 MoC 18 03 03 -46 39.8           ~ 8 0
32 [CB88] 112 MoC 18 08 35.7 -01 49 47           ~ 4 0
33 LDN 507 MoC 18 16 15 -02 32.8           ~ 30 0
34 LDN 483 DNe 18 17 35 -04 39.8           ~ 315 0
35 NAME HH 80-81 IRS HII 18 19 11.8 -20 47 35           ~ 148 0
36 GCNM 23 Y*O 18 29 49.63 +01 15 21.9           ~ 273 2
37 JCMTSE J183000.2+011251 Y*O 18 30 00.4 +01 12 50           ~ 53 0
38 LDN 723 DNe 19 18 12 +19 13.6           ~ 155 0
39 LDN 663 DNe 19 36 55 +07 34.4           ~ 646 0

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