Table 8: Properties of the cz distribution for the different spectral types. ^* In the case of the two separate k+a and k+a? subsamples we use the classical variance estimator for velocity dispersion and not the biweight indicator, owing to the low number of objects (Beers et al. 1990).
Subsample $N_{\rm gal}$ ${C}_{\rm BI}$ ${S}_{\rm BI}^*$

[km s^-1] [km s^-1]

k 59 $\rm 27~988 ^{+86} _{-111}$ $\rm 770^{+119} _{-96}$

k+a 6 $\rm 27~920 ^{+347} _{-386}$ $\rm 597 ^{+86} _{-62}$

k+a? 7 $\rm 27~839 ^{+1402} _{-305}$ $\rm 1188 ^{+318} _{-131}$

k+a + k+a? 13 $\rm 27~805 ^{+353} _{-265}$ $\rm 964 ^{+285} _{-143}$

e 11 $\rm 27~941 ^{+522} _{-219}$ $\rm 1607 ^{+314} _{-219}$

**Table 8:** Properties of the cz distribution for the different spectral types. ^* In the case of the two separate k+a and k+a? subsamples we use the classical variance estimator for velocity dispersion and not the biweight indicator, owing to the low number of objects (Beers et al. 1990).
Subsample	$N_{\rm gal}$	${C}_{\rm BI}$	${S}_{\rm BI}^*$
		[km s^-1]	[km s^-1]
k	59	$\rm 27~988 ^{+86} _{-111}$	$\rm 770^{+119} _{-96}$
k+a	6	$\rm 27~920 ^{+347} _{-386}$	$\rm 597 ^{+86} _{-62}$
k+a?	7	$\rm 27~839 ^{+1402} _{-305}$	$\rm 1188 ^{+318} _{-131}$
k+a + k+a?	13	$\rm 27~805 ^{+353} _{-265}$	$\rm 964 ^{+285} _{-143}$
e	11	$\rm 27~941 ^{+522} _{-219}$	$\rm 1607 ^{+314} _{-219}$

Source LaTeX | All tables | In the text

	1 Introduction
	2 The data
	3 Cluster membership
	4 Colour properties and spatial morphology of A3921
	5 Cluster kinematics
	6 Dynamical study of the system
	7 Spectral properties of the cluster members
	8 Discussion and conclusions
	Appendix A: Red sequence identification
	References