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Home All issues Volume 575 (March 2015) A&A, 575 (2015) A27 Full HTML
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Table 8

Average velocity dispersions, crossing time, and collisional time for the Cha I and III cores detected in different tracers.

Transition D cl a D cyl b N fit c R mean d M mean e v mean f σ 1D g σ 3D h v rel,COM i v rel,cores j t cross k t coll l
(pc) (pc) (AU) (M⊙) (km s-1) (km s-1) (km s-1) (km s-1) (km s-1) (Myr) (Myr)
Cha Im
C18O 2–1 4.0 3.0 60 6462 0.35 4.72 0.34 0.59 0.54 0.77 5.0–6.7 138
CH3OH 20–10 A+ 4.0 3.0 41 6783 0.42 4.70 0.32 0.56 0.51 0.73 5.3–7.0 179
Cha I Northn
C18O 2–1 0.9 0.15 7 7761 0.36 4.47 0.29 0.50 0.46 0.65 0.3–1.8 0.5
CH3OH 20–10 A+ 0.9 0.15 4 7755 0.39 4.61 0.16 0.27 0.25 0.36 0.5–3.2 0.9
Cha I Centren
C18O 2–1 0.9 0.3 16 5640 0.52 4.48 0.20 0.35 0.32 0.46 0.8–2.5 1.2
CH3OH 20–10 A+ 0.9 0.3 15 5616 0.54 4.50 0.29 0.50 0.46 0.65 0.6–1.8 1.4
Cha I Southn
C18O 2–1 1.3 – 29 6331 0.26 4.83 0.32 0.56 0.51 0.73 2.3 13
CH3OH 20–10 A+ 1.3 – 18 6806 0.29 4.85 0.30 0.51 0.47 0.67 2.5 19
Cha IIIm
C18O 2–1 4.9 0.8 29 5969 0.25 1.50 0.23 0.40 0.37 0.52 2.0–12 36
CH3OH 20–10 A+ 4.9 0.8 15 6845 0.34 1.41 0.18 0.32 0.29 0.42 2.5–15 49
Cha III Northn
C18O 2–1 0.6 0.3 8 6317 0.38 1.36 0.09 0.15 0.14 0.19 2.0–4.0 1.1
CH3OH 20–10 A+ 0.6 0.3 6 7276 0.48 1.32 0.09 0.15 0.14 0.20 1.9–3.9 1.1
Cha III Centren
C18O 2–1 0.9 0.5 9 5408 0.18 1.53 0.31 0.53 0.49 0.69 0.9–1.7 9.8
CH3OH 20–10 A+ 0.9 0.5 4 6911 0.26 1.37 0.18 0.31 0.28 0.40 1.6–2.9 15
Cha III Southn
C18O 2–1 1.7 0.5 11 6429 0.23 1.59 0.17 0.29 0.27 0.38 1.7–5.7 12
CH3OH 20–10 A+ 1.7 0.5 5 6276 0.23 1.56 0.19 0.32 0.30 0.42 1.5–5.1 28

Notes.

(a)

Approximate diameter of the corresponding region (or height H when cylindrical symmetry is assumed).

(b)

Approximate diameter of cylinder (when cylindrical symmetry is assumed).

(c)

Number of spectra that were fitted, excluding second velocity components.

(d)

Mean radius of the cores.

(e)

Mean total mass of the cores.

(f)

Mean VLSR.

(g)

1D velocity dispersion.

(h)

3D velocity dispersion.

(i)

Mean velocity relative to the centre of mass of the system.

(j)

Mean relative speed between cores.

(k)

Time needed for a core to cross the region, calculated with Eq. (12) in the spherical case. In the cylindrical case the higher value is computed with Eq. (12) and the lower value with Eq. (13), i.e., they correspond to the long and short axes of the cylinder, respectively.

(l)

Time needed for cores to collide with one another.

(m)

Results for the whole cloud.

(n)

The cores located in Cha I North, Centre, and South are shown in Fig. 8, and the cores in Cha III North, Centre, and South are shown in Fig. 9.

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