Bibcode
Beckman, J. E.; Fathi, K.; Piñol, N.; Toonen, S.; Hernandez, O.; Carignan, C.
Referencia bibliográfica
Formation and Evolution of Galaxy Disks ASP Conference Series, Vol. 396, Proceedings of the conference held 1-5 October, 2007 at the Centro Convegni Matteo Ricci, Rome, Italy. Edited by José G. Funes, S.J., and Enrico Maria Corsini. San Francisco: Astronomical Society of the Pacific, 2008., p.353
Fecha de publicación:
10
2008
Número de citas
1
Número de citas referidas
1
Descripción
The Fabry-Perot interferometer FaNTOmM was used at the 3.6-m CFHT and
the 1.6-m Mont Mégantic Telescope to obtain data cubes in
Hα of 9 nearby spiral galaxies from which maps in integrated
intensity, velocity, and velocity dispersion were derived. We then
applied the Tremaine-Weinberg method, in which the pattern speed can be
deduced from its velocity field, by finding the integrated value of the
mean velocity along a slit parallel to the major axis weighted by the
intensity and divided by the weighted mean distance of the velocity
points from the tangent point measured along the slit. The measured
variables can be used either to make separate calculations of the
pattern speed and derive a mean, or in a plot of one against the other
for all the points on all slits, from which a best fit value can be
derived. Linear fits were found for all the galaxies in the sample. For
two galaxies a clearly separate inner pattern speed with a higher value,
was also identified and measured.