2D Spectroscopy of Candidate Polar-Ring Galaxies: I. The Pair of Galaxies UGC 5600/09

TL;DR

This study uses 2D spectroscopy to analyze the complex kinematic structures of the galaxy pair UGC 5600/09, revealing multiple gas and stellar components and their possible formation scenarios.

Contribution

It provides detailed kinematic mapping of the pair, identifying multiple subsystems and proposing formation models, including warps and interactions.

Findings

UGC 5600 has three kinematic subsystems: stellar disk, inner gas ring, outer gas disk.

UGC 5609 appears as a late-type spiral galaxy distorted by gravitational interaction.

The velocity field of UGC 5600 suggests a warped disk or complex multicomponent structure.

Abstract

Observations of the pair of galaxies VV 330 with the SCORPIO multimode instrument on the 6-m Special Astrophysical Observatory telescope are presented. Large-scale velocity fields of the ionized gas in H-alfa and brightness distributions in continuum and H-alfa have been constructed for both galaxies with the help of a scanning Fabry Perot interferometer. Long-slit spectroscopy is used to study the stellar kinematics. Analysis of the data obtained has revealed a complex structure in each of the pair components. Three kinematic subsystems have been identified in UGC 5600: a stellar disk, an inner gas ring turned with respect to the disk through ~80degrees, and an outer gas disk. The stellar and outer gas disks are noncoplanar. Possible scenarios for the formation of the observed multicomponent kinematic galactic structure are considered, including the case where the large-scale velocity field of the gas is represented by the kinematic model of a disk with a warp. The velocity field in the second galaxy of the pair, UGC 5609, is more regular. A joint analysis of the data on the photometric structure and the velocity field has shown that this is probably a late-type spiral galaxy whose shape is distorted by the gravitational interaction, possibly, with UGC 5600.