Spectroscopic [C i] mapping of the infrared dark cloud G48.65-0.29

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Table 1

Parameters derived at four example positions in the cloud.

Points^a		EP	P1	S2	Average^b
offsets		0′, 0′	1.3′, 0′	1.3′, –1.3′

[C i])dv	(K km s^-1)	3.1	4.4	5.0	1.6
	(K km s^-1)	10.4	11.7	9.3	5.1
T [Ci		0.29	0.37	0.53	0.31

N [Ci] ^c	(10¹⁶ cm^-2)	5.8	8.4	9.4	3.0
N [¹³CO]	(10¹⁶ cm^-2)	1.2	1.4	1.1	0.6
N [CO]	(10¹⁷ cm^-2)	7.9	8.8	7.0	3.9
N [H₂]	(10²² cm^-2)	1.0	1.1	0.9	0.5
N [Ci] /N [CO]		0.07	0.09	0.13	0.08

Notes.

^(a)

Within the beam of the [C i] observations, the emission from core P2 overlaps with that from P1 and EP so that it is not separately listed.

^(b)

Spatial average over the [C i] map.

^(c)

Using the geometric mean of emissivities at T_ex = 10 K and 25 K.

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