GHASP: An Hα kinematic survey of spiral and irregular galaxies. II. Velocity fields and rotation curves of 15 galaxies
We present Fabry-Perot images obtained during the GHASP survey (Gassendi Hα survey of SPirals). We have derived the Hα maps, the 2D velocity fields and the rotation curves for a new set of 15 galaxies, increasing the sample we plan to build. The majority of the objects studied here are late-type spirals (Sc-Sdm) and irregular galaxies. Only 8 galaxies have a regular and symmetric rotation curve (two of them have a solid-body rotation curve) and they are all of morphological type earlier than 8 ~ Sd. Five galaxies present an irregular rotation curve and they are all very late-type galaxies (t>= 8.8). For one galaxy, UGC 2053, no rotation curve could be derived, and for another one, UGC 11300, both sides have completely different behaviors. All of them have already been observed in HI by the WHISP survey led at Westerbork, for which GHASP brings an interesting complement.Based on observations collected at the Observatoire de Haute de Provence.