2015ApJ...805..185S


Query : 2015ApJ...805..185S

2015ApJ...805..185S - Astrophys. J., 805, 185 (2015/June-1)

An ammonia spectral map of the L1495-B218 filaments in the Taurus molecular cloud. I. Physical properties of filaments and dense cores.

SEO Y.M., SHIRLEY Y.L., GOLDSMITH P., WARD-THOMPSON D., KIRK J.M., SCHMALZL M., LEE J.-E., FRIESEN R., LANGSTON G., MASTERS J. and GARWOOD R.W.

Abstract (from CDS):

We present deep NH3 observations of the L1495-B218 filaments in the Taurus molecular cloud covering over a 3° angular range using the K-band focal plane array on the 100 m Green Bank Telescope. The L1495-B218 filaments form an interconnected, nearby, large complex extending over 8 pc. We observed NH3(1, 1) and (2, 2) with a spectral resolution of 0.038 km/s and a spatial resolution of 31". Most of the ammonia peaks coincide with intensity peaks in dust continuum maps at 350 and 500 µm. We deduced physical properties by fitting a model to the observed spectra. We find gas kinetic temperatures of 8-15 K, velocity dispersions of 0.05-0.25 km/s, and NH3column densities of 5x1012 to 1x1014/cm2. The CSAR algorithm, which is a hybrid of seeded-watershed and binary dendrogram algorithms, identifies a total of 55 NH3structures, including 39 leaves and 16 branches. The masses of the NH3sources range from 0.05 to 9.5 M. The masses of NH3leaves are mostly smaller than their corresponding virial mass estimated from their internal and gravitational energies, which suggests that these leaves are gravitationally unbound structures. Nine out of 39 NH3 leaves are gravitationally bound, and seven out of nine gravitationally bound NH3leaves are associated with star formation. We also found that 12 out of 30 gravitationally unbound leaves are pressure confined. Our data suggest that a dense core may form as a pressure-confined structure, evolve to a gravitationally bound core, and undergo collapse to form a protostar.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: molecules - radio lines: ISM - stars: formation

Nomenclature: Table 1: [SSG2015] NN, [SSG2015] NN.N, [SSG2015] NN.NN, [SSG2015] NN.NNN N=55.

Simbad objects: 72

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Number of rows : 72
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 LDN 1495B DNe 04 15 36.5 +28 46 06           ~ 41 0
2 [DB2002b] G168.46-15.58 DNe 04 17.4 +28 33           ~ 9 0
3 Barnard 211 DNe 04 17 35 +27 43.1           ~ 106 0
4 [SSG2015] 16 cor 04 17 36.1 +28 02 57           ~ 2 0
5 [SSG2015] 15.5 cor 04 17 36.1 +28 02 57           ~ 1 0
6 [SSG2015] 10 cor 04 17 37.6 +28 12 02           ~ 2 0
7 [SSG2015] 15 cor 04 17 41.1 +28 03 50           ~ 2 0
8 [SSG2015] 12 cor 04 17 41.7 +28 08 46           ~ 3 0
9 [SSG2015] 13.25 cor 04 17 41.7 +28 08 46           ~ 1 0
10 [SSG2015] 12.5 cor 04 17 41.7 +28 08 46           ~ 1 0
11 [SSG2015] 13 cor 04 17 42.2 +28 07 29           ~ 2 0
12 HGBS J041743.1+280600 cor 04 17 43.2 +28 05 59           ~ 5 0
13 [SSG2015] 17 cor 04 17 50.3 +27 55 52           ~ 3 0
14 [SSG2015] 11 cor 04 17 51.2 +28 14 25           ~ 2 0
15 [SSG2015] 6 cor 04 17 52.8 +28 12 26           ~ 2 0
16 [SSG2015] 7 cor 04 18 02.6 +28 10 28           ~ 2 0
17 [SSG2015] 6.5 cor 04 18 02.6 +28 10 28           ~ 1 0
18 [SSG2015] 8 cor 04 18 03.7 +28 07 17           ~ 2 0
19 [SSG2015] 5 cor 04 18 04.2 +28 22 52           ~ 1 0
20 LDN 1495 DNe 04 18.1 +27 37           ~ 314 1
21 [SSG2015] 9 cor 04 18 07.0 +28 05 13           ~ 2 0
22 [SSG2015] 7.5 cor 04 18 07.0 +28 05 13           ~ 1 0
23 [SSG2015] 8.5 cor 04 18 07.0 +28 05 13           ~ 1 0
24 [SSG2015] 20 cor 04 18 07.9 +27 33 53           ~ 1 0
25 [SSG2015] 19.25 cor 04 18 11.0 +27 35 21           ~ 1 0
26 [SSG2015] 19 cor 04 18 11.0 +27 35 21           ~ 1 0
27 [SSG2015] 18.5 cor 04 18 11.0 +27 35 21           ~ 1 0
28 [SSG2015] 18 cor 04 18 11.7 +27 35 46           ~ 1 0
29 NAME L1495N-A cor 04 18 31.8 +28 27 31           ~ 11 0
30 [SSG2015] 1.5 cor 04 18 33.0 +28 27 58           ~ 1 0
31 [SSG2015] 1 cor 04 18 33.0 +28 27 58           ~ 1 0
32 [SSG2015] 2 cor 04 18 33.1 +28 27 11           ~ 1 0
33 LDN 1495A DNe 04 18.6 +28 25           ~ 9 0
34 [SSG2015] 3 cor 04 18 39.1 +28 23 29           ~ 1 0
35 NAME L1495A-S cor 04 18 41.8 +28 23 50           ~ 11 0
36 [DB2002b] G168.87-15.58 DNe 04 18.7 +28 16           ~ 20 0
37 [SSG2015] 4 cor 04 18 45.9 +28 23 30           ~ 1 0
38 [SSG2015] 21 cor 04 19 23.3 +27 14 46           ~ 1 0
39 [SSG2015] 22 cor 04 19 37.1 +27 15 18           ~ 1 0
40 [SSG2015] 21.925 cor 04 19 42.5 +27 13 25           ~ 1 0
41 [SSG2015] 23.75 cor 04 19 42.5 +27 13 25           ~ 1 0
42 [SSG2015] 23 cor 04 19 42.5 +27 13 25           ~ 1 0
43 [SSG2015] 22.85 cor 04 19 42.5 +27 13 25           ~ 1 0
44 [SSG2015] 24 cor 04 19 51.5 +27 11 26           ~ 1 0
45 [SSG2015] 24.5 cor 04 19 51.5 +27 11 26           ~ 1 0
46 [SSG2015] 25 cor 04 19 57.6 +27 10 15           ~ 1 0
47 [SSG2015] 26 cor 04 20 09.7 +27 09 44           ~ 1 0
48 [SSG2015] 28.5 cor 04 20 12.2 +27 06 02           ~ 1 0
49 [SSG2015] 27.75 cor 04 20 12.2 +27 06 02           ~ 1 0
50 [SSG2015] 28 cor 04 20 12.2 +27 06 02           ~ 1 0
51 [SSG2015] 27 cor 04 20 14.7 +27 07 39           ~ 1 0
52 [SSG2015] 29 cor 04 20 15.5 +27 04 23           ~ 1 0
53 Barnard 213 DNe 04 20 51 +27 16.3           ~ 179 0
54 [SSG2015] 30.5 cor 04 20 51.6 +27 01 54           ~ 1 0
55 [SSG2015] 31 cor 04 20 51.6 +27 01 54           ~ 2 0
56 [SSG2015] 32 cor 04 20 54.1 +27 03 13           ~ 3 0
57 [SSG2015] 30 cor 04 21 02.5 +27 02 30           ~ 2 0
58 [SSG2015] 34 cor 04 21 12.5 +27 01 09           ~ 1 0
59 [SSG2015] 33 cor 04 21 21.7 +26 59 31           ~ 1 0
60 Barnard 216 DNe 04 24.0 +26 37           ~ 46 0
61 NAME [BM89] L1521B cor 04 24 12.7 +26 36 53           ~ 64 0
62 [SSG2015] 35 cor 04 24 20.6 +26 36 02           ~ 2 0
63 [SSG2015] 36 cor 04 24 25.3 +26 37 16           ~ 2 0
64 LDN 1521D DNe 04 27 46.5 +26 18 52           ~ 215 0
65 Barnard 217 DNe 04 27 46.5 +26 17 52           ~ 89 0
66 [SSG2015] 37 cor 04 27 47.5 +26 17 58           ~ 1 0
67 [SSG2015] 38 cor 04 27 55.8 +26 19 38           ~ 1 0
68 Barnard 218 DNe 04 28.1 +26 16           ~ 33 0
69 [SSG2015] 39 cor 04 28 09.2 +26 20 28           ~ 1 0
70 NAME [BM89] L1521E DNe 04 29 21.0 +26 14 19           ~ 95 1
71 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3817 0
72 LDN 663 DNe 19 36 55 +07 34.4           ~ 587 0

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2021.12.08-02:27:34

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