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Home All issues Volume 557 (September 2013) A&A, 557 (2013) A94 Full HTML
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Table A.2

Hyperfine structure fit results and physical parameters of dense cores derived from N2H+ (1−0) and C2H (1−0) lines.

V LSR b ΔVb T ex c N mol c size M gas d
ID A × τa (km s-1) (km s-1) τ a (K) (cm-2) (′′) (M⊙)
N2H+ (1−0)
01 1.28 ± 0.01 + 33.01 ± 0.01 2.12 ± 0.01 0.17 ± 0.01 10.68 3.25 × 1012 38 320
02 1.21 ± 0.02 + 26.88 ± 0.01 2.64 ± 0.02 0.31 ± 0.02 6.94 3.45 × 1012 40 250
03 1.72 ± 0.01 + 26.56 ± 0.01 2.79 ± 0.01 0.29 ± 0.01 9.13 5.42 × 1012 33 270
04 1.83 ± 0.03 + 26.50 ± 0.01 2.54 ± 0.02 0.19 ± 0.02 13.00 6.08 × 1012 42 520
05 2.00 ± 0.01 + 43.56 ± 0.01 2.80 ± 0.01 0.10 ± 0.01 23.19 10.70 × 1012 31 990
06 1.35 ± 0.05 + 106.58 ± 0.02 3.54 ± 0.04 0.31 ± 0.04 7.43 5.20 × 1012 21 2010
07 1.88 ± 0.01 + 42.60 ± 0.01 3.28 ± 0.01 0.23 ± 0.01 11.45 7.59 × 1012 58 670
08 1.13 ± 0.01 + 53.48 ± 0.01 2.94 ± 0.03 0.29 ± 0.01 6.99 3.60 × 1012 45 870
09 2.44 ± 0.02 + 113.64 ± 0.01 3.33 ± 0.01 0.64 ± 0.01 6.83 8.80 × 1012 39 4810
10 3.89 ± 0.01 + 57.85 ± 0.01 3.03 ± 0.01 0.12 ± 0.01 36.28 32.22 × 1012 40 5460
11 3.45 ± 0.02 + 57.50 ± 0.01 3.36 ± 0.01 0.18 ± 0.01 22.50 21.68 × 1012 43 4330
12 1.72 ± 0.01 + 59.20 ± 0.01 2.71 ± 0.01 0.10 ± 0.01 20.39 8.10 × 1012 44 1700
13 0.30 ± 0.01 + 43.94 ± 0.05 4.64 ± 0.09 0.10 ± 0.03 5.98 1.52 × 1012 29 110
14 0.54 ± 0.01 − 44.51 ± 0.01 2.36 ± 0.01 0.10 ± 0.01 8.48 1.41 × 1012 24 150
C2H (1−0)
01 1.62 ± 0.01 + 32.97 ± 0.80 2.69 ± 2.66 0.10 ± 0.10 19.37 17.20 × 1013 58 3650
02 0.39 ± 0.05 + 26.79 ± 0.04 2.56 ± 0.14 0.46 ± 0.30 3.68 4.09 × 1013 43 290
03 0.55 ± 0.03 + 26.35 ± 0.02 2.97 ± 0.07 1.05 ± 0.15 3.32 9.31 × 1013 41 630
04 1.21 ± 0.10 + 26.55 ± 0.04 3.14 ± 0.10 2.23 ± 0.30 3.34 21.10 × 1013 55 2790
05 1.12 ± 0.01 + 43.83 ± 0.01 3.10 ± 0.01 0.10 ± 0.01 14.30 11.30 × 1013 37 1320
06 0.60 ± 0.07 + 106.35 ± 0.06 3.85 ± 0.18 0.14 ± 0.38 7.34 5.83 × 1013 48 3620
07 0.81 ± 0.01 + 42.41 ± 0.01 4.35 ± 0.02 0.10 ± 0.01 11.24 10.10 × 1013 51 1740
08 0.57 ± 0.07 + 53.57 ± 0.04 2.68 ± 0.15 0.61 ± 0.31 3.78 5.94 × 1013 44 1210
09 0.51 ± 0.01 + 113.51 ± 0.01 3.69 ± 0.06 0.10 ± 0.01 8.03 4.77 × 1013 35 1770
10 1.25 ± 0.05 + 58.00 ± 0.02 3.34 ± 0.06 0.72 ± 0.11 4.65 12.10 × 1013 30 1040
11 1.49 ± 0.03 + 57.62 ± 0.01 4.04 ± 0.04 1.36 ± 0.07 3.95 21.40 × 1013 42 3620
12 0.71 ± 0.03 + 59.23 ± 0.02 3.02 ± 0.06 0.32 ± 0.10 5.17 5.75 × 1013 43 1000
13 0.64 ± 0.02 + 43.87 ± 0.05 5.58 ± 0.12 0.10 ± 0.02 9.42 9.45 × 1013 31 660
14 0.76 ± 0.01 − 44.45 ± 0.01 2.96 ± 0.03 0.10 ± 0.02 10.65 6.25 × 1013 32 1010

Notes.

(a)

Parameters obtained from the CLASS fit with A = f [Jν(Tex) − Jν(Tbg)], and τ the optical depth of the main hyperfine, adopted to be the (12,3-01,2) line for the N2H+ and the (12,2–01,1) line for the C2H.

(b)

Systemic velocity, Vlsr, and linewidth, ΔV, both in km s-1.

(c)

Excitation temperature, Tex, in K, and molecular column density, Nmol, in cm-2.

(d)

Mass of the gas calculated as Mgas = (Nmol/X) μ mH Area, where Area = π size/2, mH is the mass of the hydrogen atom, μ is the molecular weight (=16 for N2H+ and =14 for C2H), and X is the abundance with respect to H2 (fixed to 3 × 10-10 for N2H+ and 3 × 10-9 for C2H; e.g., Huggins et al. 1984; Caselli et al. 2002b; Beuther et al. 2008; Padovani et al. 2009; Busquet et al. 2011; Frau et al. 2012).

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