The interacting galaxy pair KPG 390: H$\alpha$ kinematics

Abstract

In this work we present scanning Fabry-Perot H$\alpha$ observations of the isolated interacting galaxy pair NGC 5278/79 obtained with the PUMA Fabry-Perot interferometer. We derived velocity fields and rotation curves for both galaxies. For NGC 5278 we also obtained the residual velocity map to investigate the non-circular motions, and estimated its mass by fitting the rotation curve with a disk+halo components. We test three different types of halo (pseudo-isothermal, Hernquist and Navarro Frenk White) and obtain satisfactory fits to the rotation curve for all profiles. The amount of dark matter required by pseudo-isothermal profile is about ten times smaller than, that for the other two halo distributions. Finally, our kinematical results together with the analysis of dust lanes distribution and of surface brightness profiles along the minor axis allowed us to determine univocally that both components of the interacting pair are trailing spirals.

21 pages 14 figures, accepted for publication on Astronomical Journal

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• Detection of infalling hydrogen in transfer between the interacting galaxies NGC 5426 and NGC 5427
• A Kinematical Study of the Dwarf Irregular Galaxy NGC 1569 and its Supernova Remnants
• Disk Mass-to-Light ratio distribution from stellar population synthesis: Application to rotation curve decomposition of NGC 5278 (KPG 390A)
• Outer and inner mass distributions of the irregular galaxies UGC 4284 and UGC 11861: Constraining the baryonic content through stellar population synthesis studies
• H$\alpha$ kinematics of the isolated interacting galaxy pair KPG 486 (NGC 6090)
• Resolved properties of a luminous "hinge clump" in the compact group of galaxies NGC\,6845