Polycyclic aromatic hydrocarbon processing in a hot gas

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Table 3:

Physical properties and PAH lifetime, $\tau _{0}$ , in objects showing PAH emission characteristics.
Object	$n_{\rm H}$	T	Reference	$\tau_{\rm0}$ (ref)	$\tau_{\rm0}$ (min)	$\tau_{\rm0}$ (max)	$\tau_{\rm object}$	Destruction
	(cm^-3)	K		(yr)	(yr)	(yr)	(yr)	agent

M 82	0.013	$5.8\times10^{6}$	(a)	162	43	1302	${\sim}2\times10^{7}$	electrons
M 17	0.3	$7\times10^{6}$	(b)	8.2	2	71	${\sim}1\times10^{6}$	electrons
N132D	10	$8\times10^{6}$	(c)	0.3	0.07	2.5	${\sim}3\times10^{3}$	electrons
Orion	10⁴	$7\times10^{3}$	(d)	$1.3\times10^{7}$	$1.4\times10^{5}$	$7.5\times10^{11}$	${\sim}1\times10^{6}$	ions

References. (a) Ranalli et al. (2008); (b): Townsley et al. (2003); (c): Hwang et al. (1993); (d): Tielens (2005).

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