2010ApJ...724.1402K

Query : 2010ApJ...724.1402K

2010ApJ...724.1402K - Astrophys. J., 724, 1402-1429 (2010/December-1)

A survey of H I narrow self-absorption in molecular cores.

KRCO M. and GOLDSMITH P.F.

Abstract (from CDS):

The study of cold atomic hydrogen (H I) in molecular clouds has the potential to significantly improve our understanding of the formation of molecular clouds, the atomic to molecular hydrogen conversion process, and star formation.
Result. from the first large survey of H I Narrow Self Absorption (HINSA) features outside of the Taurus Molecular Cloud Complex are presented. Previous hypotheses that cold atomic hydrogen represents the third largest constituent of molecular clouds are confirmed with a mean abundance of 10–2.8 in comparison with the total proton column density. HINSA features are observed in over 80% of the observed clouds, accompanied by indications that cold H I probably exists in all clouds. We find that HINSA features are observable to distances of at least 700 pc. Nine clouds have been mapped in detail revealing that HINSA abundances can vary significantly within a cloud both spatially and in an individual velocity component. Possible explanations for this phenomenon are briefly discussed.

Abstract Copyright: ∼

Journal keyword(s): ISM: abundances - ISM: atoms - ISM: clouds - ISM: molecules

Simbad objects: 51

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Number of rows : 51
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 LDN 1333 DNe 02 26 04 +75 28.5           ~ 60 0
2 LDN 1340 DNe 02 30 40 +72 57.3           ~ 35 0
3 LDN 1355 DNe 02 52.7 +69 02           ~ 23 0
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
5 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 965 0
6 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 437 1
7 LDN 1780 DNe 15 39.7 -07 10           ~ 82 0
8 LDN 134 MoC 15 53 36.3 -04 35 26           ~ 217 0
9 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 799 1
10 LDN 1757 DNe 16 31.9 -19 36           ~ 17 0
11 LDN 43 DNe 16 34 29.3 -15 47 11           ~ 147 1
12 LDN 1782 DNe 16 42 15 -19 44.7           ~ 10 0
13 LDN 260 DNe 16 46 58.2 -09 36 20           ~ 43 0
14 LDN 255 DNe 16 47 06.7 -09 35 21           ~ 35 0
15 LDN 204 DNe 16 47 47.3 -12 05 16           ~ 55 0
16 LDN 158 DNe 16 47 50 -14 05.3           ~ 33 0
17 LDN 63 DNe 16 50 15.5 -18 06 06           ~ 76 0
18 LDN 31 DNe 16 50 27 -19 07.3           ~ 19 0
19 LDN 129 DNe 16 55 08 -16 22.0           ~ 11 0
20 LDN 173 DNe 17 17.4 -18 31           ~ 15 0
21 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
22 LDN 392 DNe 17 53 05.2300 -08 33 41.170           ~ 14 0
23 LDN 460 DNe 17 58 09 -03 46.2           ~ 11 0
24 LDN 432 DNe 17 58 27 -05 40.9           ~ 10 0
25 LDN 462 DNe 18 07 33 -04 41.7           ~ 12 0
26 LDN 490 DNe 18 15 19 -03 45.7           ~ 11 0
27 LDN 492 DNe 18 15 51 -03 44.4           ~ 50 0
28 LDN 429 DNe 18 16 44 -08 18.9           ~ 44 0
29 LDN 328 DNe 18 17 00 -18 01.9           ~ 52 0
30 LDN 483 DNe 18 17 35 -04 39.8           ~ 359 0
31 LDN 466 DNe 18 19 41.9 -06 04 40           ~ 19 0
32 LDN 322 DNe 18 19.9 -18 59           ~ 5 0
33 LDN 539 DNe 18 23 59 -01 01.5           ~ 13 0
34 LDN 416 DNe 18 25 30 -10 39.2           ~ 8 0
35 LDN 503 DNe 18 29 27 -04 39.0           ~ 6 0
36 LDN 588 DNe 18 35 55 -00 30.2           ~ 16 0
37 LDN 531 DNe 19 06 10.0 -06 53 45           ~ 67 0
38 LDN 922 DNe 20 38 37 +44 34.6           ~ 8 0
39 LDN 1148 DNe 20 40 31.6 +67 21 45           ~ 68 0
40 LDN 1049 DNe 20 41 33 +57 34.0           ~ 11 0
41 LDN 1155 DNe 20 43.5 +67 41           ~ 28 0
42 LDN 981 DNe 21 00 15 +50 17.3           ~ 14 0
43 LDN 1029 DNe 21 01.5 +54 12           ~ 6 0
44 LDN 1172 DNe 21 02 27.7 +67 54 08           ~ 57 0
45 LDN 970 DNe 21 12 13.1 +47 23 23           ~ 67 0
46 LDN 1021 DNe 21 21 39 +50 57.3           ~ 14 0
47 LDN 1014 cor 21 24 05.9 +49 59 07           ~ 94 0
48 LDN 1111 DNe 21 40 30.0 +57 48 00           ~ 16 0
49 LDN 1235 DNe 22 14 55 +73 25.0           ~ 27 0
50 LDN 1262 MoC 23 25 47 +74 17.6           ~ 136 0
51 LDN 1253 DNe 23 56 32 +58 31.7           ~ 56 0

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