MALT90 molecular content on high-mass IR-dark clumps

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Table 2.

MALT90 Molecular line observation parameters.

Lines	Frequency^a	Tracer
	(MHz)
HCO⁺(1–0)^b	89188.526	Density, kinematics
N₂H⁺(1–0)^c	93173.770	Density, chemically robust
HNC(1–0)^b	90663.572	Density, cold chemistry
HCN(1–0)^d	88631.847	Density
H¹³CO⁺(1–0)	86754.330	Optical depth, column density, V_LSR
HN¹³C(1–0)	87090.859	Optical depth, column density, V_LSR
SiO(2–1)	86847.010	Shock, outflow

Notes.

^(a)

The frequencies for the lines were obtained from the Cologne Database for Molecular Spectroscopy (CDMS, Müller et al. 2001, 2005) and the Leiden atomic and molecular database (LAMDA; Schöier et al. 2005).

^(b)

Some of the HCO⁺ and HNC lines show double peaks due to infall, outflow, rotation, etc.

^(c)

N₂H⁺ line has 15 hyperfine components.

^(d)

HCN line has three hyperfine components.

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