The mass distribution of clumps within infrared dark clouds. A Large APEX Bolometer Camera study

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Table 2

N₂H⁺ (3–2) observational parameters, distances, and virial masses.

IRDC	IR-dark^a	Position^b		T_MB	ΔV	v_LSR	D^c	M_vir^d	N_cl^e	M^e
clump	8/24	RA	Dec
		(J2000)	(J2000)	(K)	(km s^-1)	(km s^-1)	(kpc)	(M_⊙)		(M_⊙)

G329P1	N/N	16:00:17.3	−53:09:18	(0.25)					22	209
G329P2	Y/N	16:00:32.2	−53:12:39	3.20(0.19)	6.69(0.19)	−43.42(0.08)	3.0	2444/1466	1	2692
G329P3	Y/Y	16:00:38.5	−53:13:41	(0.23)					12	211
G329P4	Y/Y	16:00:47.7	−53:15:01	(0.25)					37	56
G329P5	N/N	16:01:10.1	−53:16:02	3.26(0.32)	5.83(0.17)	−42.00(0.08)	2.9	1642/985	3	867
G331P1	Y/Y	16:10:08.7	−51:22:52	0.86(0.17)	1.79(0.50)	−45.10(0.18)	3.1	135/81	6	168
G331P2	N/N	16:10:26.9	−51:22:42	1.26(0.25)	5.60(0.49)	−45.31(0.25)	3.1	1976/1185	1	553
G335P1	N/N	16:29:22.2	−49:12:24	3.88(0.33)	4.14(0.14)	−39.83(0.05)	3.0	612/367	1	1002
G335P2	Y/N	16:29:27.4	−48:56:51	(0.25)					32	89
G335P3	N/N	16:29:37.8	−48:58:58	(0.24)					13	488
G335P4	N/N	16:30:05.3	−48:48:37	2.29(0.27)	5.53(0.26)	−44.40(0.12)	3.2	1477/886	2	664
G337P1	N/N	16:37:35.8	−47:39:27	0.78(0.11)	2.49(0.59)	−39.56(0.24)	3.0	234/140	12	85
G337P2	N/N	16:37:47.4	−47:38:59	0.94(0.26)	3.61(0.72)	−40.85(0.30)	3.1	1095/657	3	937
G343P1	N/N	17:00:20.7	−42:49:08	(0.23)					4	281
G343P2	N/N	17:00:39.6	−42:51:28	1.27(0.14)	1.59(0.50)	−27.42(0.14)	2.7	122/73	13	104
G343P3	Y/Y	17:01:00.4	−42:48:05	(0.23)					6	252
G345P1	N/N	17:05:10.5	−41:29:01	3.44(0.33)	5.85(0.15)	−26.32(0.07)	2.8	1150/690	1	2630
G345P2	Y/Y	17:05:16.5	−41:26:14	0.80(0.17)	5.26(0.76)	−26.04(0.37)	2.8	3137/1882	7	1520

Notes.Parameters are obtained from Gaussian fits. For non-detections, the values given in parenthesis represent the spectra 1σ_rms noise level.

^(a)

“Y” means the clump is 8 μm- or 24 μm-dark and “N” means the clump is 8 μm- or 24 μm-bright.

^(b)

Units of right ascension are hours, minutes, and seconds and units of declination are degrees, arcminutes, and arcseconds.

^(c)

Derived (near) kinematic distances by using the N₂H⁺ (3–2) line (see Sect. 4.1).

^(d)

Virial mass of clumps estimated using two density distributions. The first value corresponds to a constant density distribution while the second value corresponds to a density distribution that varies as ρ ∝ 1/r².

^(e)

Associated Gaussclumps running number and gas mass (see Sect. 4.2 and Table 3).

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