# The study of two barred galaxies with curious kinematical features

## TL;DR

This study investigates the kinematics and structure of two barred galaxies, disproving their previously suspected low mass-to-light ratios and revealing complex central features like nuclear discs and peanut-shaped bulges.

## Contribution

It provides new observational data and N-body simulations that clarify the internal structures and stellar populations of NGC 5347 and UGC 1344, challenging prior mass estimates.

## Key findings

- Disproved the low mass-to-light ratio hypothesis for both galaxies.
- Identified nuclear kinematically decoupled disc in NGC 5347.
- Detected a peanut-shaped bulge in UGC 1344.

## Abstract

We performed long-slit spectral observations of two SB-type galaxies: NGC 5347, UGC 1344. They were previously suspected as the galaxies with unusually low mass-to-light ratios (on the ground of mass estimates from the Hi linewidths), which are in conflict with their observed colours. The observations were conducted at the Russian 6-m telescope. The aim of the study was to clarify the kinematics and structure, as well as the properties of stellar populations of the galaxies. The results of observations disproved the peculiarly low mass-to-light ratios of both galaxies. The most probable reasons of underestimation of their masses are discussed. We tried to reproduce the main observed features of kinematical profiles of the galaxies in the N-body simulations of barred galaxies. We found that both galaxies possess central components of different structure. Indeed, the age and velocity dispersion of stellar population in NGC 5347 are low in its innermost part in comparison to that of the bulge or a bar, which agrees with the presence of nuclear kinematically decoupled disc. It probably was formed due to the bar which supplied the inner region with gas. The kinematical profiles of the second galaxy UGC 1344 give evidences in favour of the central peanut-shaped bulge. In spite of the different luminosities of the two galaxies, they possess nearly equal (close to solar) central stellar abundance and the flattening of the stellar metallicity gradient in the bar regions. However, in the less luminous NGC 5347 the mean stellar age is younger than that in UGC 1344.