The dark matter halo shape of edge-on disk galaxies - II. Modelling the HI observations: methods

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Table 1:

Summary of previous observations of gas velocity dispersion in face-on galaxies.
Galaxies	i	Type	H I Velocity	Resolution		H I radius			Dist.	Reference
			dispersion	spectral	spatial
	$^{\circ }$			km s^-1	kpc	kpc	R₂₅	$\theta_{\rm maj}$	Mpc
NGC 3938	$10\pm5$	ScI	constant^h	8.2^a	$1.2 \times 1.7$	13.1	1.7	7.5	10	van der Kruit & Shostak (1982)
NGC 628	$5\pm5$ ^e	ScI	falling^h	8.2^a	$2.9 \times 2.9$	40.7	2.8	14.0	10	Shostak & van der Kruit (1984)
NGC 1058	$8\pm2$ ^f	Sc II-III	constant^h	8.2^a	$2.2 \times 2.2$ ^c	18.9	4.3	8.7	10^c	van der Kruit & Shostak (1984)
NGC 1058	$8\pm2$ ^f	Sc II-III	falling^h	2.58^a	$2.1 \times 2.0$ ^d	14.1	3.2	6.7	10^d	Dickey et al. (1990)
NGC 6946	34	Scd/Sc I	falling^h	8.25^a	$0.7 \times 0.8$	17.2	2.0	21.2	5.9^b	Boulanger & Viallefond (1992)
NGC 5474^g	21⁺⁴_-6	ScdIV	falling^h	5.2^a	$1.2 \times 1.1$	10.5	4.6	8.6	7	Rownd et al. (1994)
NGC 1058	$8\pm2$ ^f	Sc II-III	falling^h	2.58^a	$1.5 \times 1.5$	21.8	5.0	15.0	10	Petric & Rupen (2006)

Notes. ^(a) Hanning smoothed.
^(b) Distance shown is mean distance calculated from brightest stars in NGC 6946 group.
^(c) To facilitate comparison with the other observations for NGC 1058, we have used the adopted distance of 10 Mpc used by Petric & Rupen (2006), rather than the van der Kruit & Shostak (1984) preferred value of 9 Mpc.
^(d) To facilitate comparison with the other observations for NGC 1058, we have used the adopted distance of 10 Mpc used by Petric & Rupen (2006), rather than the Dickey et al. (1990) preferred value of 10.2-14.5 Mpc.
^(e) Warps from ${\approx}5^{\circ}$ within the optical disk to $i\approx0^{\circ}$ , then back to $i\approx10^{\circ}$ at the H I edge (Shostak & van der Kruit 1984).
^(f) Warps from ${\approx}8$ $\pm$ $2^{\circ}$ within the optical disk to exactly face-on at the H I edge (van der Kruit & Shostak 1984).
^(g) Classified as peculiar, and known to be interacting with its much larger neighbour M101 which is only 90 kpc distance assuming a distance of 7 Mpc (Rownd et al. 1994).
^(h) Direct measurement of the velocity dispersion of the broadening of the vertical velocity dispersion from a near face-on disk. Measurements corrected for instrumental broadening and inclination, but not beam-smearing.

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