High-dynamic-range extinction mapping of infrared dark clouds - Dependence of density variance with sonic Mach number in molecular clouds

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Volume 549 (January 2013)

A&A, 549 (2013) A53

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Table 1

Properties of the IRDCs.

#^a	l	b	D ^b	σ _v	σ _v	σ _v	σ _v	σ _N/⟨N⟩	Σ_sat^c	M _MIR	M _combined	α _vir
				(G, box)^d	(F, box)^d	(G, ell)^d	(F, ell)^d	(box)^d
	[°]	[°]	[kpc]	[km s^-1]	[km s^-1]	[km s^-1]	[km s^-1]		[g cm^-2]	[10³ M_⊙]	[10³ M_⊙]

A	18.822	–0.285	4.8	2.04	3.44	2.05	3.78	0.63	0.496	17.7	18.5	1.4
B	19.271	0.074	2.4	1.60	1.71	1.77	1.79	0.69	0.488	2.2	2.2	2.2
C	28.373	0.076	5.0	3.72	3.38	3.75	3.41	0.80	0.520	45	53.2	2.4
D	28.531	–0.251	5.7	1.85	2.12	2.01	2.14	0.67	0.436	53.4	74.3^e	0.5
E	28.677	0.132	5.1	4.32	1.94	2.15	2.55	0.60	0.504	25.2	28.7	1.1
F	34.437	0.245	1.56^f	3.62	4.15	1.86	2.54	0.73	0.370	0.79^f	0.85	3.5
G	34.771	–0.557	2.9	3.28	3.15	2.95	2.90	0.57	0.347	2.01	3.3	4.7
H	35.395	–0.336	2.9	2.03	2.11	1.48	1.78	0.52	0.416	13.34	16.7	0.7
I	38.952	–0.475	2.7	1.65	1.72	1.26	1.32	0.63	0.402	2.05	2.7	1.2
J	53.116	0.054	1.8	0.96	1.14	0.83	0.95	0.50	0.328	0.08	0.2	1.5

Notes.

^(a)

Naming according to BT09.

^(b)

From Simon et al. (2006).

^(c)

Saturation limit, i.e., the maximum observable mass surface density, of the mid-infrared data (cf., BT12).

^(d)

The letters G(aussian) and F(ixed range) refer to the two approaches used in estimating the velocity dispersions in the clouds (see Sect. 2.4). The abbreviations box and ell refer to the two approaches used in defining the cloud area (see Sect. 3.2).

^(e)

M_combined can be somewhat underestimated because of incomplete coverage of the NIR data, see Fig. B.4.

^(f)

The distance for the cloud F has been recently derived from parallax measurements (Kurayama et al. 2011) and we adopt this distance (however, see also Foster et al. 2012). For comparison, the GRS distance for the cloud is D = 3.7 kpc).

^(g)

The mass given by BT12 was scaled to correspond the adopted distance.

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