Kinematics and dynamics of the luminous infrared galaxy pair NGC 5257/58 (Arp 240)

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Table 3.

Kinematical parameters of NGC 5257 and NGC 5258 from this work.

Parameter	NGC 5257	NGC 5258
Heliocentric systemic velocity (km s⁻¹)	6812 ± 5	6762 ± 5
PA (°)	95 ± 3	218 ± 5
Kinematical inclination (°)	58 ± 5	57 ± 4
R_bif in arcsec (kpc)	17 (8.23)	16 (7.76)
V_bif (km s⁻¹)	290	220
Ω_p (km s⁻¹ kpc⁻¹)	20 ± 3	…
R_cor in arcsec (kpc)	15 ± 2 (7.27 ± 0.97)	…
Maximum rotation velocity (km s⁻¹)	290^a	210^a
	360 ± 10^b	330 ± 5^b
	325^c	320^c

Notes.

^(a)

From analytical fit of Hα RC before bifurcation (Fig. 4).

^(b)

Point with highest velocity in Hα RC considering all points (Fig. 6).

^(c)

From fit of multi-wavelength RC (Fig. 12).

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