The apparent “reversed” motion of gas and stars in M 82

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Table A.1

Spectral lines for rotation studies.

Element^a	Origin^b	Location	Contamination

Radio
H i, CO	ISM	thoughout M 82	none

near-IR
H-Paschen	H ii^c (e)	spiral arms	stars(a)
[S iii]*	H ii (e)	spiral arms	none
Ca II*	stars (a)	stellar disk	none
			(tidal arms)

visible
[S ii]*	H ii (e)	spiral arms	none
[N ii]*	H ii (e)	spiral arms	none
Hα	H ii (e)	spiral arms	stars (a)
Hα	stars (a)	stellar disk	H ii (e)
Na	stars (a)	stellar disk	ISM (a)

blue
H-Balmer	H ii (e)	spiral arms	stars (a)
H-Balmer	stars (a)	stellar disk	H ii (e)
[O ii]*	H ii (e)	spiral arms	none
Ca ii H&K	stars (a)	stellar disk	ISM (a)

Notes.

^(a)

Elements and wavelength region of observation, strong, unblended lines are denoted by *.

^(b)

e: emission line, a: absorption line.

^(c)

H ii regions excited by young stars.

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