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We have presented kinematical data for 21 early-type galaxies. Among the 18
objects for which we have measured
, nine had no previously
published value; and NGC 2332 had no previous determinations of
.
For most of them, our profiles extend to more than one
.
Comparisons with data from the literature lead to the following two comments:
- for a couple of galaxies, we note significant differences in
,
but the overall agreement is good: for 20 objects, our dispersions are on
average within 12% of the others. For these objects, the
mean of the residuals
with respect to the Fundamental Plane,
(as calculated by PS96, but with no rotation and no stellar-population effects
included), is slightly
reduced, from -0.06 down to -0.03, when replacing the literature values
by our measurements; and the scatter in
is also marginally
reduced, from 0.22 (rms) to 0.19. We are thus confident in the overall
reliability of our dispersions.
- there is evidence, from the nine galaxies with previous
measurements, that the discrepancy is much larger for the rotation than for
the dispersion; this may come from two effects, a
difference in the adopted PA, and a different distance r for the
determination: the case of NGC 2768 is revealing, our new determination
corresponding to the second plateau in the rotation curve; this justifies
the indication of
in Table 3 (click here).
Acknowledgements
We are endebted to the telescope operators at the
Observatoire de Haute-Provence for their help in collecting the data. We
thank the referee, G. Busarello, for his comments. We have made use of the
Lyon-Meudon Extragalactic Database supplied by the LEDA team.
Copyright by the European Southern Observatory (ESO)
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