L1506: a prestellar core in the making | Astronomy & Astrophysics (A&A)

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Table 2:

The Monte Carlo cloud model used to fit the spectra (Figs. 7 and 9-12).
Shell radius		Density	Temperature	Rad. velocity^a	Rot. velocity	Turbulence^b	Abundance^c
(AU)	( $^{\prime \prime }$ )	(cm^-3)	(K)	(km s^-1)	(km s^-1)	(km s^-1)	N₂H⁺	C¹⁸O	¹³CO
1740	12	50 000	10	0.11	0.200	$\leq$ 0.11/ $\leq$ 0.068	1.5(-11)	$\leq$ 5(-9)	$\leq$ 3(-8)
3480	25	47 400	10	0.11	0.141	$\leq$ 0.11/ $\leq$ 0.068	2.5(-10)	$\leq$ 5(-9)	$\leq$ 3(-8)
5220	37	41 300	10	0.11	0.115	$\leq$ 0.11/ $\leq$ 0.068	4(-10)	$\leq$ 5(-9)	$\leq$ 3(-8)
6933	50	38 100	10	0.11	0.100	$\leq$ 0.11/ $\leq$ 0.068	5(-10)	$\leq$ 5(-9)	$\leq$ 3(-8)
8666	62	33 900	10	0.11	0.089	$\leq$ 0.11/ $\leq$ 0.068	5(-10)	$\leq$ 5(-9)	$\leq$ 3(-8)
10 400	75	24 300	10	0.11	0.082	$\leq$ 0.11/ $\leq$ 0.068	4(-10)	$\leq$ 5(-9)	$\leq$ 3(-8)
12 133	87	18 500	10	0.11	0.076	$\leq$ 0.11/ $\leq$ 0.068	3(-10)	1(-8)	6(-8)
13 933	100	14 700	10	0.11	0.070	$\leq$ 0.11/ $\leq$ 0.068	2(-10)	1.7(-7)	1(-6)
15 666	112	11 900	9	0.11	0.066	$\leq$ 0.11/ $\leq$ 0.068	1(-10)	1.7(-7)	1(-6)
17 400	125	9990	8	0.11	0.063	$\leq$ 0.11/ $\leq$ 0.068	1(-10)	1.7(-7)	1(-6)
19 133	137	8540	8	0.11	0.060	$\leq$ 0.11/ $\leq$ 0.068		1.7(-7)	1(-6)
20 866	150	7400	8	0.11	0.058	$\leq$ 0.11/ $\leq$ 0.068		1.7(-7)	1(-6)
22 600	162	6100	8	0.11	0.055	$\leq$ 0.11/ $\leq$ 0.068		1.7(-7)	1(-6)
24 333	175	4800	8	0.11	0.053	$\leq$ 0.11/ $\leq$ 0.068		1.7(-7)	1(-6)
26 066	187	3850	8	0.11	0.052	$\leq$ 0.11/ $\leq$ 0.068		1.7(-7)	1(-6)
27 866	200	3130	8	0.11	0.050	$\leq$ 0.11/ $\leq$ 0.068		1.7(-7)	1(-6)
29 600	212	2560	8	0.11	0.048	$\leq$ 0.11/ $\leq$ 0.068		1.7(-7)	1(-6)
31 333	225	2140	8	0	-0.3	0.4		$\leq$ 5(-9)	6(-6)
46 666	335	1000	8	-0.09	-0.3	0.4		$\leq$ 5(-9)	6(-6)
66 666	479	500	10	-0.09	-0.3	0.4		$\leq$ 5(-9)	6(-6)
83 333	598	400	12	-0.09	-0.3	0.4		$\leq$ 5(-9)	6(-6)
100 000	718	400	13	-0.09	-0.3	0.4		$\leq$ 5(-9)	6(-6)
126 666	909	200	13	-0.09	-0.3	0.4		$\leq$ 1(-9)	1(-8)

Notes. ^(a) Positive velocity indicates inward motion (contraction); ^(b) FWHM turbulence is $\leq$ 0.068 km s^-1 for the positive offsets in the C¹⁸O model and for all offsets in the N₂H⁺ model and $\leq$ 0.11 km s^-1 otherwise (for Figs. 9 and 10 only one value could be used: 0.11 km s^-1 has been selected); ^(c) relative to H₂. 1(-10) means 1 $\times$ 10^-10.

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