Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283..722q&link_type=abstract
Astronomy and Astrophysics, Vol. 283, NO. 3/MAR(III), P. 722, 1994
Astronomy and Astrophysics
Astrophysics
16
Scientific paper
New velocities of galaxies in the region of the group centered on NGC 1407 are presented. As known, NGC 1400 has a peculiar velocity of ~1100 km s^-1^ with respect to the mean velocity of its parent group. Five velocity structures are identified, clearly showing that this group is restricted in velocity space around NGC 1407. With 6 new velocities in the group itself, we estimate its mass and conclude that it lies between 1 and 7 X 10^13^ solar masses. In any case, this implies a high M/L ratio, independent whether NGC 1400 belongs to the group or not. Our best estimate is 560 M_sun_/L_sun_, for an adopted mass of 3 x 10^13^ solar masses. With such a high mass of the group, the relative velocity of NGC 1400 is no longer puzzling, and it can be regarded as a bona-fide member, as indicated by several distance indicators. Our interpretation is then that this group has a large content of dark matter, in a similar fashion as some reported groups dominated by dumb- bell galaxies. In fact, we suggest that the NGC 1407/1400 pair will become a typical dumb-bell when NGC 1400 reaches the group center.
Fouque' Pascal
Quintana Hernan
Way Michael J.
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