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KPG 390: A pair of trailing spirals.

Published online by Cambridge University Press:  12 August 2011

P. Repetto ,
M. Rosado ,
R. Gabbasov  and
I. Fuentes-Carrera
P. Repetto
Affiliation:
Instituto de Astronomía, Universidad Nacional Autonoma de México (UNAM), Apdo. Postal 70-264, 04510, México, D.F., México. email: [email protected].
M. Rosado
Affiliation:
Instituto de Astronomía, Universidad Nacional Autonoma de México (UNAM), Apdo. Postal 70-264, 04510, México, D.F., México. email: [email protected].
R. Gabbasov
Affiliation:
Instituto de Astronomía, Universidad Nacional Autonoma de México (UNAM), Apdo. Postal 70-264, 04510, México, D.F., México. email: [email protected].
I. Fuentes-Carrera
Affiliation:
Department of Physics, Escuela Superior de Física y Matemáticas, IPN, U.P. Adolfo López Mateos, C.P. 07738, Mexico city IPN, México.
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Abstract

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In this study we present scanning Fabry-Perot Hα observations of the isolated interacting galaxy pair NGC 5278/79. We derived velocity fields, various kinematic parameters and rotation curves for both galaxies. These kinematical results together with the fact that dust lanes have been detected in both galaxies, as well as the analysis of surface brightness profiles along the minor axis, allowed us to determine univocally that both components of the interacting pair are trailing spirals. We have also estimated the mass of NGC 5278 fitting its rotation curve with a disk-halo component. We have tested three different types of halo (pseudo-isothermal, Hernquist and Navarro Frenk White) and we have obtained that the rotation curve can be fitted either with a pseudo-isothermal, an Hernquist halo or a Navarro Frenk White halo component, although in the first case the amount of dark matter required is about ten times smaller than for the other two halo distributions.

Keywords

Instrumentation: interferometersmethods: data analysistechniques: image processingtechniques: interferometrictechniques: radial velocitiesastrometrygalaxies: interactionsgalaxies: kinematics and dynamicsgalaxies: spiral(cosmology): dark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S271: Astrophysical Dynamics: From Stars to Galaxies , June 2010 , pp. 127 - 134
Copyright
Copyright © International Astronomical Union 2011

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