Chemistry of C3 and carbon chain molecules in DR21(OH)

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Table 8

Parameters assumed to remain constant in present models.

Parameter	Value	Unit

^b Cosmic Ray Ionization Rate ζ	1.3 × 10^-17	s^-1
^b Visual Extinction A_V	10
^a,b Grain Radius a_d	1 × 10^-5	cm
^a,b Nonthermal Desorption Yield a_RRK	0.01
^a,b Initial Temperature T_i	10	K
^a,b Warm-up Timescale t_sc^a,b	2 × 10⁵	yr
^b Warm-up Offset Time t_off	1 × 10⁵	yr

Notes.

^(a)

Garrod & Herbst (2006);

^(b)

Hassel et al. (2008).

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