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

Full paper

View the references in ADS

Number of rows : 39

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2023	#notes
1	V* T Tau	TT*	04 21 59.4319873992	+19 32 06.432393336		11.22	10.12	9.80	K0IV/Ve	1382	1
2	2MASS J04314444+1808315	Y*O	04 31 44.44680	+18 08 31.5384					~	164	0
3	LDN 1527	DNe	04 39 53	+25 45.0					~	593	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					~	91	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					~	36	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	443	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					~	400	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					~	1201	1
22	IRAS 16289-4449	Or*	16 32 32.19264	-44 55 30.6552				15.95	~	132	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					~	29	0
34	LDN 483	DNe	18 17 35	-04 39.8					~	281	0
35	NAME HH 80-81 IRS	HII	18 19 11.8	-20 47 35					~	142	0
36	NAME SH 2-68 FIR 1	cor	18 29 49.63	+01 15 21.9					~	263	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					~	154	0
39	LDN 663	DNe	19 36 55	+07 34.4					~	616	0

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