Dense molecular gas towards W49A: a template for extragalactic starbursts?

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Table 7

Estimated column densities towards the Northern clump.

Molecule	V _LSR	T _mb	FWHM	rms	T _ex	τ	N
	(km s^-1)	(K)	(km s^-1)	(K)	(K)		(10¹² cm^-2)

H¹³CN J = 4–3	15.9	0.35	7.4	0.06	10	0.09	13.8
DCN J = 5–4^a	18.8	0.08	3.5	0.05	14	0.01	4.3
HNC J = 4–3	15.7	1.31	5.8	0.05	10	0.38	46.8
H¹³CO⁺J = 4–3	15.3	0.42	5.4	0.07	15	0.04	0.9
DCO⁺J = 5–4	—	—	—	0.06	15	—	<0.7

Notes. Column densities are calculated with RADEX assuming T_kin = 75 K and n(H₂) = 5 × 10⁵ cm^-3 towards RA = 19:10:13.6; Dec = 09:06:48.

^(a)

Tentative detection based on the rms noise in the spectrum, N(DCN) < 3.7 × 10¹² cm^-2 for T_ex ≥ 10 K and DCN/HCN < 0.008.

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