2004ApJS..153..523L

Query : 2004ApJS..153..523L

2004ApJS..153..523L - Astrophys. J., Suppl. Ser., 153, 523-543 (2004/August-0)

A survey for infall motions toward starless cores. III. CS (3-2) and DCO+ (2-1) observations.

LEE C.W., MYERS P.C. and PLUME R.

Abstract (from CDS):

We present CS (3-2) and DCO+ (2-1) observations of 94 starless cores and compare the results with previous CS (2-1) and N2H+ (1-0) observations to study inward motions in starless cores. Eighty-four cores were detected in both CS and DCO+ lines. A significant number of CS (3-2) profiles and a small number of DCO+ (2-1) lines show the classical ``infall asymmetry'' similar to that seen in CS (2-1) observations. The DCO+ (2-1) lines, however, usually show a single Gaussian peak. The integrated intensity of N2H+ correlates well with that of DCO+ (2-1) but poorly with that of CS (2-1) and CS (3-2), suggesting that CS suffers significantly more depletion onto grains than do either DCO+ or N2H+. Despite these depletion effects, there is evidently enough optical depth for the CS (3-2) and CS (2-1) spectral lines to exhibit infall asymmetries.

The velocity shifts of the CS (3-2) and (2-1) lines with respect to N2H+ correlate well with each other and have similar distributions. This implies that, in many cores, systematic inward motions of gaseous material may occur over a range of density of at least a factor ∼4.

We identify 18 infall candidates based on observations of CS (3-2), CS (2-1), DCO+ (2-1) and N2H+ (1-0). The eight best candidates, L1355, L1498, L1521F, L1544, L158, L492, L694-2, and L1155C-1, each show at least four indications of infall asymmetry and no counterindications.

Fits of the spectra to a two-layer radiative transfer model in ten infall candidates suggest that the median effective line of sight speed of the inward-moving gas is ∼0.07 km.s–1 for CS (3-2) and ∼0.04 km.s–1 for CS (2-1). Considering that the optical depth obtained from the fits is usually smaller in CS (3-2) than in (2-1) line, this may imply that CS (3-2) usually traces inner denser gas in higher inward motions than CS (2-1). However, it is also possible that this conclusion is not representative of all starless core infall candidates, because of the statistically small number analyzed here. Further line observations will be useful to test this conclusion.


Abstract Copyright: ∼

Journal keyword(s): ISM: Globules - ISM: Kinematics and Dynamics - Stars: Formation

VizieR on-line data: <Available at CDS (J/ApJS/153/523): table1.dat>

Nomenclature: Tables 1-3: [LM99] LNNNNA, [LM99] LNNNNA-N, [LM99] LNNNN-A, [LM99] LNNNNAN, [LM99] BNNNA, [LM99] BNNN-N, [LM99] CB NNN, [LM99] CB NNN-N, [LM99] DC LLLl+BB, [LM99] DC LLLl+BB-N, [LM99] DC LLLl+BBb, [LM99] DC LLLl+BBb-N, [LM99] VNN, [LM99] VNN-N, [LM99] Ch NN, [LM99] VNN, [LM99] Ch NN-N, [LM99] Mu NN, [LM99] TMC NA, [LM99] TMC N-N, N=94+70+10.

Simbad objects: 137

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Number of rows : 137
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 [LM99] L1271-1 cor 00 00 05.6 +67 21 49           ~ 4 0
2 LDN 1333 DNe 02 26 04 +75 28.5           ~ 60 0
3 [LM99] L1333 cor 02 26 13.7 +75 27 03           ~ 4 0
4 LDN 1355 DNe 02 52.7 +69 02           ~ 23 0
5 [LM99] L1355 cor 02 53 12.2 +68 55 52           ~ 4 0
6 [LM99] B5-1 cor 03 47 36.1 +32 55 58           ~ 6 0
7 NAME [BM89] L1498 PoC 04 10 51.4 +25 09 58           ~ 187 0
8 [LM99] L1498 cor 04 10 51.5 +25 09 50           ~ 8 0
9 LDN 1498 DNe 04 11.0 +24 58           ~ 306 0
10 [LM99] L1521B-2 cor 04 23 37.0 +26 40 06           ~ 8 0
11 [LM99] L1399-1 cor 04 24 01.3 +55 07 55           ~ 6 0
12 [LM99] L1399-2 cor 04 24 58.8 +54 59 40           ~ 8 0
13 [LM99] L1399-3 cor 04 25 12.2 +54 56 50           ~ 6 0
14 [LM99] B217-2 cor 04 28 08.6 +26 20 53           ~ 15 0
15 LDN 1521F DNe 04 28 39.3 +26 51 43           ~ 224 1
16 [LM99] L1521F cor 04 28 39.8 +26 51 35           ~ 5 0
17 [LM99] L1400A-2 cor 04 29 06.3 +54 46 15           ~ 3 0
18 [LM99] L1521-2 cor 04 29 31.8 +26 59 59           ~ 7 0
19 [LM99] L1524-4 cor 04 30 05.7 +24 25 16           ~ 12 0
20 NAME [BM89] L1400A DNe 04 30 40.1 +54 52 36           ~ 16 0
21 Bad 16 Or* 04 30 50.2774891944 +23 00 08.757461592       14.95   F1 147 0
22 [LM99] L1400A cor 04 30 51.7 +54 52 36           ~ 3 0
23 [LM99] L1551S-2 cor 04 30 57.5 +18 15 34           ~ 6 0
24 LDN 1445 DNe 04 32.1 +46 36           ~ 17 0
25 [LM99] L1445 cor 04 32 07.8 +46 37 23           ~ 3 0
26 NAME Kutner's Cloud MoC 04 32 44.6 +24 23 13           ~ 283 0
27 NAME [BM89] TMC-2 PoC 04 32 44.7 +24 25 13           ~ 188 0
28 [LM99] TMC 2 cor 04 32 48.7 +24 24 12           ~ 4 0
29 [LM99] B18-3 cor 04 34 06.1 +24 09 45           ~ 10 1
30 [LM99] 46 cor 04 35 51.3 +24 09 21           ~ 20 0
31 LDN 1503 DNe 04 40.4 +29 56           ~ 25 0
32 [LM99] CB 22 cor 04 40 39.9 +29 52 59           ~ 5 0
33 [LM99] TMC 1 cor 04 41 33.0 +25 44 44           ~ 3 0
34 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1872 0
35 [LM99] L1507A1 cor 04 42 38.6 +29 43 45           ~ 8 0
36 [LM99] CB 23 cor 04 43 31.5 +29 39 11           ~ 8 0
37 LDN 1507 MoC 04 43 32 +29 40.0           ~ 37 0
38 [LM99] L1517C-1 cor 04 54 47.4 +30 35 38           ~ 3 0
39 LDN 1517A PoC 04 55 06.3 +30 33 40           ~ 25 0
40 [LM99] L1517A cor 04 55 10.2 +30 32 50           ~ 5 0
41 NAME [BM89] L1517B cor 04 55 18.8 +30 38 04           ~ 163 0
42 [LM99] L1512-1 cor 05 04 09.7 +32 43 09           ~ 5 0
43 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 965 0
44 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 437 1
45 LDN 1544E cor 05 04 43.3 +25 11 36           ~ 10 0
46 [CB88] 28 MoC 05 06 16.0 -03 56 29           ~ 22 0
47 [LM99] CB 28 cor 05 06 20.4 -03 56 21           ~ 3 0
48 [LM99] L1552 cor 05 17 40.7 +26 05 18           ~ 4 0
49 LDN 1552 DNe 05 17.7 +26 03           ~ 23 0
50 NAME [BM89] L1582A DNe 05 31 18.4 +12 30 31           ~ 33 0
51 [LM99] 69 cor 05 32 03.4 +12 31 05           ~ 4 0
52 LDN 1582B DNe 05 32 16.5 +12 49 20           ~ 19 0
53 [LM99] L1622A2 cor 05 54 38.8 +01 53 44           ~ 8 0
54 [LM99] L1622A1 cor 05 54 53.1 +01 57 23           ~ 7 0
55 [LM99] L1622B cor 05 54 53.3 +01 45 39           ~ 3 0
56 LDN 1622B DNe 05 54 53.3 +01 45 39           ~ 4 0
57 [LM99] L1578-2 cor 06 08 36.1 +18 11 29           ~ 4 0
58 [DB2002b] G192.28-0.95 MoC 06 08 55 +17 50.4           ~ 19 0
59 [LM99] CB 45 cor 06 08 57.2 +17 50 15           ~ 5 0
60 [LM99] V13-2 cor 08 08 47.5 -36 03 12           ~ 2 1
61 [LM99] V13-3 cor 08 08 53.7 -35 57 13           ~ 3 1
62 [LM99] V13-1 cor 08 09 01.7 -36 01 09           ~ 2 1
63 [DB2002b] G338.16+16.40 DNe 15 40 32 -34 39.7           ~ 8 0
64 [LM99] DC 3382+164 cor 15 40 35.3 -34 40 19           ~ 2 0
65 [LM99] DC 3388+165-2 cor 15 42 19.3 -33 50 59           ~ 6 0
66 [DB2002b] G338.84+16.53 DNe 15 42 36 -34 08.5           ~ 8 0
67 [LM99] DC 3388+165-3 cor 15 42 39.7 -33 52 01           ~ 5 0
68 [LM99] DC 3388+165-6 cor 15 43 17.6 -34 13 30           ~ 5 0
69 [LM99] DC 3392+161-2 cor 15 45 12.4 -34 13 21           ~ 4 0
70 [LM99] DC 3392+161-3 cor 15 45 14.7 -34 20 43           ~ 4 0
71 [LM99] DC 3392+161-4 cor 15 45 28.5 -34 24 40           ~ 4 0
72 LDN 134A DNe 15 53 36.4 -04 35 26           ~ 49 0
73 [LM99] L134A cor 15 53 36.4 -04 35 26           ~ 4 0
74 [LM99] L183 cor 15 54 12.2 -02 49 42           ~ 4 0
75 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 799 1
76 NAME Ophiuchus D MoC 16 28 29.2 -24 18 25           ~ 122 0
77 [LM99] L1696A cor 16 28 31.4 -24 18 18           ~ 4 0
78 LDN 1696B cor 16 28 59.3 -24 20 43           ~ 20 0
79 [LM99] L1704-1 cor 16 30 50.7 -23 42 14           ~ 5 0
80 LDN 1709A DNe 16 30 50.7 -23 41 03           ~ 25 0
81 [LM99] L1709A cor 16 30 50.8 -23 41 03           ~ 1 0
82 [LM99] L1757-1 cor 16 31 57.7 -19 41 45           ~ 4 0
83 [LM99] L1709B-2 cor 16 32 50.5 -23 52 39           ~ 7 0
84 LDN 1689B DNe 16 34 42.1 -24 36 11           ~ 181 0
85 [LM99] L1689B cor 16 34 45.8 -24 37 51           ~ 4 0
86 Sandqvist 21 DNe 16 36 50 -35 37.1           ~ 8 0
87 [LM99] DC 3460+78 cor 16 36 53.0 -35 36 29           ~ 4 0
88 BHR 144 MoC 16 37 28 -35 13.9           ~ 10 0
89 [LM99] DC 3464+79 cor 16 37 31.2 -35 14 26           ~ 2 0
90 [LM99] L1782-2 cor 16 42 32.7 -19 43 37           ~ 7 0
91 [LM99] L158 cor 16 47 23.2 -13 59 21           ~ 3 0
92 [LM99] L204C cor 16 47 31.6 -12 09 44           ~ 2 0
93 LDN 204C DNe 16 47 38.4 -12 08 04           ~ 10 0
94 [LM99] L204C-2 cor 16 47 46.2 -12 23 19           ~ 8 0
95 LDN 158 DNe 16 47 50 -14 05.3           ~ 33 0
96 NAME [LM99] L234E-S cor 16 48 08.6 -10 57 25           ~ 14 0
97 LDN 63 DNe 16 50 15.5 -18 06 06           ~ 76 0
98 [LM99] L63 cor 16 50 15.5 -18 05 16           ~ 3 0
99 [LM99] L462-1 cor 18 07 31.2 -04 43 29           ~ 7 0
100 [LM99] L462-2 cor 18 07 36.2 -04 40 29           ~ 7 0
101 [LM99] 255 cor 18 15 49.8 -03 46 13           ~ 5 0
102 LDN 492 DNe 18 15 51 -03 44.4           ~ 50 0
103 [LM99] CB 130-1 cor 18 16 16.0 -02 33 00           ~ 12 0
104 [LM99] CB 130-3 cor 18 16 18.0 -02 16 40           ~ 16 0
105 [LM99] L429-1 cor 18 17 11.6 -08 13 30           ~ 12 0
106 [LM99] L429-2 cor 18 17 16.3 -08 17 52           ~ 6 0
107 LDN 451 DNe 18 21.7 -07 09           ~ 4 0
108 [LM99] L451 cor 18 21 54.5 -07 12 41           ~ 2 0
109 [LM99] L648-1 cor 18 39 28.7 +12 41 24           ~ 7 0
110 [LM99] L673-7 cor 19 21 35.5 +11 21 14           ~ 32 0
111 LDN 694 DNe 19 40.7 +10 57           ~ 32 0
112 [LM99] L694-2 cor 19 41 04.6 +10 57 02           ~ 82 0
113 [LM99] L1041-2 cor 20 37 17.7 +57 49 21           ~ 17 0
114 [LM99] L922-1 cor 20 38 29.7 +44 32 00           ~ 7 0
115 [LM99] L922-2 cor 20 38 47.7 +44 35 57           ~ 5 0
116 LDN 1148 DNe 20 40 31.6 +67 21 45           ~ 68 0
117 [LM99] L1049-1 cor 20 41 04.8 +57 27 31           ~ 7 0
118 [LM99] 344 cor 20 41 10.9 +67 20 35           ~ 6 0
119 [LM99] L1049-2 cor 20 41 30.6 +57 33 44           ~ 7 0
120 LDN 1155C DNe 20 43 18.1 +67 50 36           ~ 30 0
121 [LM99] L1155C-2 cor 20 43 22.1 +67 50 31           ~ 9 0
122 [LM99] L1155C1 cor 20 43 29.9 +67 52 42           ~ 10 0
123 LDN 1155E PoC 20 44 17.6 +67 42 00           ~ 10 0
124 [LM99] 348 cor 20 44 17.8 +67 41 59           ~ 4 0
125 [LM99] 350 cor 20 49 46.6 +60 15 39           ~ 9 0
126 [LM99] L981-1 cor 21 00 13.2 +50 20 06           ~ 10 0
127 LDN 1063 DNe 21 07.9 +56 18           ~ 11 0
128 [LM99] L1063 cor 21 08 10.2 +56 18 20           ~ 4 0
129 [LM99] L944-2 cor 21 17 46.8 +43 18 20           ~ 5 0
130 [LM99] L1251A-2 cor 22 27 41.5 +75 13 31           ~ 9 0
131 LDN 1251 DNe 22 36.1 +75 16           ~ 119 0
132 [LM99] 396 cor 22 37 02.3 +58 57 21           ~ 5 0
133 LDN 1197 DNe 22 37 20 +58 56.1           ~ 32 0
134 [LM99] L1251 cor 22 37 31.2 +75 10 23           ~ 5 0
135 LDN 1234 DNe 23 17 43 +62 26.1           ~ 11 0
136 [LM99] L1234 cor 23 17 57.5 +62 26 39           ~ 4 0
137 [LM99] CB 246-2 cor 23 56 37.2 +58 34 29           ~ 6 0

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