UGC 7388: a galaxy with two tidal loops

TL;DR

This study investigates UGC 7388, a giant edge-on spiral galaxy with two faint, extended tidal loops, revealing large-scale rotation and suggesting past interactions with a massive companion affecting its structure.

Contribution

First detailed spectroscopic and morphological analysis of UGC 7388 highlighting its tidal loops and potential past galactic interactions.

Findings

Detection of two faint extended tidal loops around UGC 7388

Observation of large-scale rotation of the brighter loop

Implication of past disruption by a massive companion

Abstract

We present the results of spectroscopic and morphological studies of the galaxy UGC7388 with the 8.1-m Gemini North telescope. Judging by its observed characteristics, UGC7388 is a giant late-type spiral galaxy seen almost edge-on. The main body of the galaxy is surrounded by two faint (\mu(B) ~ 24 and \mu(B) ~ 25.5) extended (~20-30 kpc) loop-like structures. A large-scale rotation of the brighter loop about the main galaxy has been detected. We discuss the assumption that the tidal disruption of a relatively massive companion is observed in the case of UGC7388. A detailed study and modeling of the observed structure of this unique galaxy can give important information about the influence of the absorption of massive companions on the galactic disks and about the structure of the dark halo around UGC7388.