skip to main content

SciTech ConnectSciTech Connect

Title: Discovery of a tidal dwarf galaxy in the Leo Triplet

We report the discovery of a dwarf galaxy in the Leo Triplet. Analysis of the neutral hydrogen distribution shows that it rotates independently of the tidal tail of NGC 3628, with a radial velocity gradient of 35-40 km s{sup –1} over approximately 13 kpc. The galaxy has an extremely high neutral gas content, accounting for a large amount of its total dynamic mass and suggesting a low amount of dark matter. It is located at the tip of the gaseous tail, which strongly suggests a tidal origin. If this is the case, it would be one of the most confident and nearest (to the Milky Way) detections of a tidal dwarf galaxy and, at the same time, the object most detached from its parent galaxy (≈140 kpc) of this type.
Authors:
; ;  [1] ;  [2]
  1. Obserwatorium Astronomiczne Uniwersytetu Jagiellońskiego ul. Orla 171, 30-244 Kraków (Poland)
  2. Astronomisches Institut, Ruhr-Universität Bochum Universitätsstrasse 150, D-44780 Bochum (Germany)
Publication Date:
OSTI Identifier:
22356899
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 786; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; DETECTION; DISTRIBUTION; DWARF STARS; GALAXIES; HYDROGEN; INTERACTIONS; MILKY WAY; NONLUMINOUS MATTER; RADIAL VELOCITY; TRIPLETS