Seibert, Mark; Salo, Heikki; Regan, Michael W.; Mizusawa, Trisha; Menéndez-Delmestre, Karín; Madore, Barry F.; Laurikainen, Eija; Laine, Jarkko; Kim, Taehyun; Ho, Luis C.; Hinz, Joannah L.; Gil de Paz, Armando; Comerón, Sébastien; Buta, Ronald J.; Sheth, Kartik; Muñoz-Mateos, Juan Carlos; Gadotti, Dimitri A.; Bosma, Albert; Athanassoula, E.; Sánchez-Gallego, José Ramón; Falcón-Barroso, Jesús; Beckman, John E.; Font, Joan; Knapen, Johan H.; Erroz-Ferrer, Santiago
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 427, Issue 4, pp. 2938-2949.
Description
We present a study of the kinematics of the isolated spiral galaxy NGC
864, using Hα Fabry-Perot data obtained with the Galaxy Hα
Fabry-Perot System (GHαFaS) instrument at the William Herschel
Telescope in La Palma, complemented with images at 3.6 μm, in the R
band and in Hα filter, and integral-field spectroscopic data. The
resulting data cubes and velocity maps allow the study of the kinematics
of the galaxy, including in-depth investigations of the rotation curve,
velocity moment maps, velocity residual maps, gradient maps and
position-velocity diagrams. We find asymmetries in the velocity field in
the bar zone, caused by non-circular motions, probably in response to
the potential of the bar. We also find a flat-profile bar, in agreement
with the strong bar, with the grand design spiral pattern, and with the
gap between the ends of the bar and the start of the spiral arms. We
quantify the rate of massive star formation, which is concentrated in
the two spiral arms.
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Johan Hendrik
Knapen Koelstra
