Initial phases of massive star formation in high infrared extinction clouds - I. Physical parameters

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Volume 515 (June 2010)

A&A, 515 (2010) A42

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Table 9:

Mean physical properties of the clumps and star formation indicators in diffuse, peaked and multiply peaked clouds.
	Diffuse	Peaked	Multiply peaked
Mass ( $M_\odot$ )	230^a	185	150
Size (pc)	0.52^a	0.36	0.30
$N_{\rm N_{H_2}}$ ( $10^{22}\;$ cm^-2)	4.5^a	5.5	8.5
$T_{{\rm rot}}$ (K)	13.5	15.7	17.5
$\Delta v$ (km s^-1)	1.2	1.4	1.6
IRDC corr.^b (within 2 $^\prime$ )	83%	50%	70%
24 $\mu$ m^c (within 1 $^\prime$ )	17%	83%	100%
Ext. 4.5 $\mu$ m ^d (within 1 $^\prime$ )	none	none	29%
Masers^e (within 1 $^\prime$ )	none	${\rm H_2O}$ 25%	${\rm H_2O}$ 57%
			${\rm CH_3OH}$ 29%

Notes. ^(a) As most diffuse clouds contained no clumps, we derived the sizes from the smoothed bolometer maps of the diffuse clouds. These are therefore not properties of the clumps in diffuse clouds, but properties of the diffuse clouds themselves; ^(b) catalogs of Simon et al. (2006a) and Simon et al. (2006b); ^(c) ${>}100~{\rm MJy~sr^{-1}}$ ; ^(d) extended 4.5 $\mu$ m sources from the catalog of Cyganowski et al. (2008); ^(e) H₂O: Jaffe et al. (1981) and this work, CH₃OH: Szymczak et al. (2000).

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