Bibcode
Rozas, M.; Zurita, A.; Beckman, J. E.
Bibliographical reference
Astrophysics and Space Science, v. 276, Issue 2/4, p. 1179-1188 (2001).
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2001
Journal
Citations
0
Refereed citations
0
Description
We combine H_α and broad-band optical imaging and H_α
velocity mapping over the face of the barred galaxy NGC 3359, obtained
within the BARS programme on the Canary Island telescopes (Lourenso and
Beckman, these proceedings). From the H_α image we have determined
the positions, fluxes and diameters of a total of 547 HII regions, and
computed their luminosity function whose slope is within the range of
those of morphologically similar galaxies found in the literature. We
have gone on to quantify other statistical properties, such as the
diameter distribution and the flux densities of the regions. Using
Fabry-Perot mapping in H_α with the TAURUS II instrument, we have
produced maps of velocity and velocity dispersion, and computed the
rotation curve out to ~ 3 scale lengths from the centre of the galaxy.
From the map of the residual velocities we detected streaming motions in
the gas across the spiral arms and the presence of non-circular motions
of order 30-40 km s^-1 around the bar: the gas response to the
gravitational potential.