Kinematic modeling of disk galaxies - III. The warped “Spindle” NGC 2685

Table 4:

Basic properties of the detected dwarf galaxies in the vicinity of NGC 2685.
Descr.	Par.	PGC 25002	UGC 4683	Unknown
Classification of galaxy (de Vaucouleurs et al. 1991)	Type	IB(rs)m	dI	Unknown
Right Ascension (J2000) (NED)	RA (J2000)	${8}^{\rm h}{54}^{\rm m}{22}^{\rm s}\!\!.\:\!{50.0}$	${8}^{\rm h}{57}^{\rm m}{54}^{\rm s}\!\!.\:\!{37.0}$	${8}^{\rm h}{57}^{\rm m}{42}^{\rm s}\!\!.\:\!{51.0}$
Declination (J2000) (NED)	Dec (J2000)	$~ {58}^{\circ}{58}^{\prime}{4}^{\prime\prime}\!\!\!.\;\!{0.00}$	$~ {59}^{\circ}{4}^{\prime}{57}^{\prime\prime}\!\!\!.\;\!{7.00}$	$~ {59}^{\circ}{2}^{\prime}{28}^{\prime\prime}\!\!\!.\;\!{85.00}$
Optical heliocentric systemic velocity ( $\rm km~{\rm s}^{-1}$ )	$V_{\rm sys}$	$1017.2 ~\pm~ 8.2$	$927.0 ~\pm~ 8.2$	$1187.0 ~\pm~ 8.2$
Apparent B-band magnitude ( $\rm mag$ , Paturel 1989)	$m_{\rm B}$	16.4	14.8	very low
Total H I flux ( ${\rm Jy}~{\rm km}~{\rm s}^{-1}$ )	$F_{\rm {H {\sc i}}}$	$3.3 ~\pm~ 0.3$	$2.2 \pm 0.2$	$2.1 ~\pm~ 0.2$
H I mass ( $10^7~{M}_\odot$ )	$M_{\rm {H {\sc i}}}$	$17.8 ~\pm~ 1.9$	$12.2 ~\pm~ 1.3$	$11.3 ~\pm~ 1.2$
Projected distance of object from NGC 2685 ( $~\hbox{$^{\prime\prime}$ }$ )	$\rm d_{2685}$	$1016 ~\pm~ 28$	$1651 ~\pm~ 28$	$1484 ~\pm~ 28$
Distance of object from NGC 2685 ( $\rm kpc$ )	$\rm D_{2685}$	$75 ~\pm~ 20$	$122 ~\pm~ 31$	$109 ~\pm~ 28$
Profile width at 20 percent of the peak flux density ( $\rm km~{\rm s}^{-1}$ )	w₂₀	$95.0 ~\pm~ 9.6$	$64.0 ~\pm~ 6.5$	$72.5 ~\pm~ 7.2$
Inclination ( $~\hbox{$^\circ$ }$ )	i	29.2	31.6	90.0
Dynamical mass ( $10^8~{M}_\odot$ )	$M_{\rm dyn}$	${>}137 \pm 53$	${>}32 ~\pm~18$	${>}8.7 ~\pm~ 6.0$

For all objects the same distance of NGC 2685 (Table 1) was assumed. The data show that these galaxies probably cannot account for the ring in NGC 2685 and are dynamically unimportant.

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