2002AJ....124.2756V


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.06CET00:41:38

2002AJ....124.2756V - Astron. J., 124, 2756-2789 (2002/November-0)

Completion of a SCUBA survey of Lynds dark clouds and implications for low-mass star formation.

VISSER A.E., RICHER J.S. and CHANDLER C.J.

Abstract (from CDS):

We have carried out a survey of optically selected dark clouds using the bolometer array SCUBA on the James Clerk Maxwell Telescope at λ=850 µm. The survey covers a total of 0.5 deg2 and is unbiased with reference to cloud size, star formation activity, and the presence of infrared emission. Several new protostars and starless cores have been discovered; the protostars are confirmed through the detection of their accompanying outflows in CO (2-1) emission. The survey is believed to be complete for Class 0 and Class I protostars, and yields two important results regarding the lifetimes of these phases. First, the ratio of Class 0 to Class I protostars in the sample is roughly unity, very different from the 1:10 ratio that has previously been observed for the ρ Ophiuchi star-forming region. Assuming star formation to be a homogeneous process in the dark clouds, this implies that the Class 0 lifetime is similar to the Class I phase, which from infrared surveys has been established to be ∼2x105 yr. It also suggests there is no rapid initial accretion phase in Class 0 objects. A burst of triggered star formation some ∼105 yr ago can explain the earlier results for ρ Ophiuchus. Second, the number of starless cores is approximately twice that of the total number of protostars, indicating a starless core lifetime of ∼8x105 yr. These starless cores are therefore very short lived, surviving only two or three free-fall times. This result suggests that, on size scales of ∼104 AU at least, the dynamical evolution of starless cores is probably not controlled by magnetic processes.

Abstract Copyright:

Journal keyword(s): ISM: Clouds - Stars: Formation - Stars: Pre-Main-Sequence

Nomenclature: Table 4: [VRC2001] LNNNN SMM N N=30 added.

Simbad objects: 128

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Number of rows : 128

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3138 1
2 IRAS 16277-2332 FIR 16 30 43.7 -23 39 08           ~ 3 0
3 LDN 1704 DNe 16 30 43.7109 -23 39 07.736           ~ 15 0
4 JCMTSF J163050.8-234208 smm 16 30 50.5 -23 42 08           ~ 3 0
5 JCMTSF J163132.6-240314 smm 16 31 32.5 -24 03 18           ~ 9 0
6 2MASS J16313383-2404466 Y*? 16 31 33.8411677254 -24 04 46.637442321   16.3 15.00     ~ 12 0
7 IRAS 16285-2356 FIR 16 31 34.8 -24 02 55           ~ 9 0
8 LDN 1709 DNe 16 31 34.8 -24 02 55           ~ 67 0
9 IRAS 16285-2355 Y*O 16 31 35.65752 -24 01 29.4708           ~ 107 0
10 JCMTSF J163143.5-240026 smm 16 31 43.5 -24 00 27           ~ 7 0
11 IRAS 16291-2351 FIR 16 32 09.7 -23 57 48           ~ 1 0
12 JCMTSF J163229.6-235550 cor 16 32 29.5 -23 55 54           ~ 8 0
13 [JJK2008] SMM J163247-23524 smm 16 32 47.3 -23 52 37           ~ 5 0
14 IRAS 16439-1353 FIR 16 46 45.0 -13 59 03           ~ 2 0
15 [VRC2001] L260 SMM 1 smm 16 46 58.1 -09 35 18           ~ 2 0
16 LDN 260 DNe 16 46 58.2 -09 36 20           ~ 41 0
17 2MASS J16465826-0935197 Y*O 16 46 58.267 -09 35 19.72   19.6 17.4     ~ 32 0
18 IRAS 16442-1351 FIR 16 47 06.7 -13 56 41           ~ 2 0
19 LDN 255 DNe 16 47 06.7 -09 35 21           ~ 35 0
20 JCMTSF J164709.2-093501 smm 16 47 09.0 -09 35 05           ~ 4 0
21 [VRC2001] L158 SMM 2 smm 16 47 12.8 -13 58 20           ~ 1 0
22 IRAS 16445-1352 FIR 16 47 23.2 -13 57 21           ~ 10 0
23 JCMTSF J164723.6-135908 smm 16 47 23.4 -13 59 08           ~ 2 0
24 IRAS 16446-0925 FIR 16 47 24.3 -09 30 19           ~ 1 0
25 IRAS 16446-0924 FIR 16 47 24.5 -09 29 24           ~ 1 0
26 IRAS 16450-0926 FIR 16 47 47.5 -09 31 20           ~ 1 0
27 LDN 158 DNe 16 47 50 -14 05.3           ~ 32 0
28 IRAS 16451-0953 FIR 16 47 51.9 -09 58 36           ~ 1 0
29 IRAS 16455-1405 mul 16 48 21.8 -14 10 45           ~ 10 0
30 PDS 91 Y*O 16 48 21.87 -14 10 42.8   16.7   12.9   ~ 12 0
31 IRAS 16457-1409 FIR 16 48 35.9 -14 15 01           ~ 1 0
32 Hen 3-1258 Or* 16 48 45.6323559591 -14 16 35.849943900   14.94 13.34 12.84   K6 91 0
33 JCMTSF J164845.7-141638 smm 16 48 45.9 -14 16 37           ~ 2 0
34 LDN 162 DNe 16 49 03 -14 10.7           ~ 20 0
35 IRAS 16464-1407 FIR 16 49 15.0 -14 12 58           ~ 1 0
36 JCMTSF J165014.2-180620 smm 16 50 14.6 -18 06 18           ~ 2 0
37 LDN 63 DNe 16 50 15.5 -18 06 06           ~ 74 0
38 LDN 31 DNe 16 50 27 -19 07.3           ~ 17 0
39 LDN 129 DNe 16 55 08 -16 22.0           ~ 11 0
40 LDN 57 DNe 17 22 38.2 -23 49 34           ~ 285 1
41 JCMTSF J172238.4-234955 smm 17 22 38.5 -23 49 57           ~ 2 0
42 [VRC2001] L55 SMM 1 smm 17 22 58.3 -23 58 18           ~ 3 0
43 LDN 55 DNe 17 23.0 -23 53           ~ 12 0
44 LDN 53 DNe 17 23 29 -24 02.5           ~ 7 0
45 IRAS 17205-2359 FIR 17 23 37.4 -24 02 18           ~ 3 0
46 LDN 229 DNe 17 40 23 -19 32.7           ~ 5 0
47 LDN 231 DNe 17 40 28 -19 34.2           ~ 5 0
48 IRAS 17375-1936 * 17 40 32.2089866267 -19 37 32.660021425           ~ 2 0
49 LDN 226 DNe 17 40 43 -19 39.5           ~ 8 0
50 LDN 223 DNe 17 40 51 -19 43.5           ~ 7 0
51 LDN 222 DNe 17 41 22 -19 47.5           ~ 7 0
52 LDN 233 DNe 17 45.1 -20 01           ~ 8 0
53 LDN 328 DNe 18 17 00 -18 01.9           ~ 46 0
54 [VRC2001] L328 SMM 1 smm 18 17 00.4 -18 02 04           ~ 4 0
55 [VRC2001] L483 SMM 1 smm 18 17 29.4 -04 39 37           ~ 1 0
56 NAME LDN 483 FIR Y*O 18 17 29.8 -04 39 38           ~ 59 0
57 LDN 483 DNe 18 17 35 -04 39.8           ~ 220 0
58 NAME Aql Rift DNe 18 32 -01.0           ~ 258 1
59 LDN 543 DNe 19 06.7 -06 10           ~ 24 0
60 IRAS 19116+1623 * 19 13 56.5783643439 +16 28 30.196435929           ~ 7 1
61 IRAS 19180+1116 IR 19 20 22.5 +11 22 07           ~ 17 0
62 JCMTSE J192023.0+112250 smm 19 20 23.0 +11 22 50           ~ 5 0
63 JCMTSF J192024.7+112432 smm 19 20 24.6 +11 24 34           ~ 6 0
64 AGAL G046.341-01.154 Y*O 19 20 25.1 +11 22 17           ~ 7 0
65 JCMTSF J192025.9+112002 smm 19 20 25.8 +11 20 03           ~ 8 0
66 IRAS 19180+1114 IR 19 20 25.8 +11 19 52           ~ 12 0
67 IRAS 19181+1112 Y*? 19 20 30.8690348503 +11 17 54.607114491           ~ 6 0
68 EM* AS 353 Or* 19 20 30.9919486938 +11 01 54.604157558   13.22 12.21     K5 184 1
69 IRAS 19181+1059 * 19 20 32.2721097616 +11 05 40.236204797           ~ 2 0
70 IRAS 19183+1123 * 19 20 44.2521520965 +11 28 59.625807884           ~ 4 0
71 IRAS 19184+1118 Y*? 19 20 45.7544306413 +11 23 53.447088488           ~ 6 0
72 IRAS 19184+1055 IR 19 20 45.84 +11 00 57.8           ~ 7 0
73 HD 344204 * 19 20 47.2287658548 +23 31 40.057639067   9.74 9.23     B9 5 0
74 JCMTSF J192047.9+111414 smm 19 20 47.9 +11 14 12           ~ 5 0
75 [VRC2001] L673 SMM 6 smm 19 20 48.1 +11 16 00           ~ 4 0
76 LDN 771 DNe 19 20 50 +23 29.9           ~ 18 0
77 JCMTSF J192051.5+111344 smm 19 20 51.6 +11 13 44           ~ 5 0
78 LDN 673 DNe 19 20 54.4 +11 13 12           ~ 69 0
79 [VRC2001] L673 SMM 8 smm 19 21 02.5 +11 11 46           ~ 4 0
80 IRAS 19190+1105 * 19 21 26.0917014292 +11 10 56.554166839           ~ 2 0
81 LDN 675 DNe 19 23 53 +11 07.6           ~ 12 0
82 LDN 709 DNe 19 31 52 +16 27.2           ~ 18 0
83 IRAS 19343+0727 * 19 36 49.7346037515 +07 34 29.641487569   13.09 10.96 10.54   ~ 3 0
84 NAME Vul Rift MoC 19 36 53 +23 04.7           ~ 22 0
85 LDN 663 DNe 19 36 55 +07 34.4           ~ 569 0
86 [HSW99] B 335 SMM 1 cor 19 37 00.7 +07 34 08           ~ 21 0
87 IRAS 19345+0727 FIR 19 37 01.03 +07 34 10.9           ~ 66 0
88 IRAS 19380+1045 * 19 40 25.7140434460 +10 52 20.565383444           ~ 3 0
89 LDN 694 DNe 19 40.7 +10 57           ~ 26 0
90 [VRC2001] L694 SMM 1 smm 19 41 04.3 +10 57 06           ~ 2 0
91 IRAS 19389+1048 FIR 19 41 17.7 +10 55 15           ~ 2 0
92 [VRC2001] L860 SMM 1 smm 20 03 17.9 +36 02 00           ~ 2 0
93 [VRC2001] L860 SMM 2 smm 20 03 21.0 +36 01 27           ~ 2 0
94 LDN 860 DNe 20 04.9 +36 04           ~ 6 0
95 NAME Northern Coalsack DNe 20 21 +37.0           ~ 106 0
96 LDN 917 DNe 20 39 55 +44 08.7           ~ 12 0
97 [PWK2017] 52 cor 21 02 14.8 +67 51 09           ~ 2 0
98 IRAS 21017+6742 Y*O 21 02 21.23 +67 54 20.2           ~ 30 1
99 2MASS J21022744+6754186 Y*? 21 02 27.442 +67 54 18.68           ~ 5 0
100 LDN 1172 DNe 21 02 27.7 +67 54 08           ~ 49 0
101 LDN 944 DNe 21 17 41 +43 18.1           ~ 14 0
102 JCMTSF J211744.3+431844 smm 21 17 43.9 +43 18 47           ~ 7 0
103 JCMTSF J212013.2+433203 smm 21 20 12.9 +43 32 03           ~ 3 0
104 LDN 951 DNe 21 20 13 +43 31.5           ~ 6 0
105 [VRC2001] L951 SMM 2 smm 21 20 15.8 +43 32 37           ~ 2 0
106 IRAS 21186+4320 FIR 21 20 30.0 +43 33 12           ~ 2 0
107 LDN 953 DNe 21 21 25 +43 21.0           ~ 7 0
108 LDN 1021 DNe 21 21 39 +50 57.3           ~ 13 0
109 LDN 1014 cor 21 24 05.9 +49 59 07           ~ 92 0
110 [VRC2001] L1014 SMM 1 smm 21 24 07.5 +49 59 03           ~ 2 0
111 LDN 1111 DNe 21 40 30.0 +57 48 00           ~ 16 0
112 LDN 1103 DNe 21 41.7 +56 44           ~ 22 0
113 LDN 1166 DNe 22 05.7 +59 35           ~ 12 0
114 NAME HH 354 IRS Y*O 22 06 50.37 +59 02 45.9           ~ 44 0
115 [VRC2001] L1165 SMM 1 smm 22 06 50.5 +59 02 46           ~ 3 0
116 IRAS 22051+5849 * 22 06 50.5508128485 +59 04 16.057638940           ~ 5 0
117 LDN 1165 DNe 22 06 50.7 +59 02 47           ~ 41 0
118 [DBY94] 103.3+02.8 MoC 22 07 38.5 +59 15 21           ~ 2 0
119 LDN 1185 DNe 22 29 25 +59 09.4           ~ 7 0
120 NAME III CEP ASSOC As* 23 04.2 +63 24           ~ 297 0
121 JCMTSF J232504.7+633638 smm 23 25 04.7 +63 36 40           ~ 7 0
122 LDN 1246 DNe 23 25 05.7 +63 36 34           ~ 30 0
123 JCMTSF J232516.4+633651 smm 23 25 16.4 +63 36 46           ~ 3 0
124 JCMTSF J232526.9+741825 smm 23 25 26.0 +74 18 28           ~ 2 0
125 [VRC2001] L1262 SMM 1 smm 23 25 46.5 +74 17 37           ~ 2 0
126 PSCz Q23238+7401 Y*O 23 25 46.65 +74 17 37.2           ~ 54 1
127 LDN 1262 MoC 23 25 47 +74 17.6           ~ 130 0
128 NAME Vul B Cld ~ ~           ~ 10 0

    Equat.    Gal    SGal    Ecl

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2021.03.06-00:41:38

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