The large asymmetric HI envelope of the isolated galaxy NGC 864 (CIG 96)

Authors

D Espada
A Bosma
L Verdes-Montenegro
E Athanassoula
S Leon
J Sulentic
Min Yun, University of Massachusetts - AmherstFollow

Publication Date

2005

Journal or Book Title

Astronomy and Astrophysics

Abstract

We present an HI synthesis imaging study of NGC 864 (CIG 96), a spiral galaxy well isolated from similarly sized companions, yet presenting an intriguing asymmetry in its integral HI spectrum. The asymmetry in the HI profile is associated with a strong kinematical perturbation in the gaseous envelope of the galaxy, where at one side the decay of the rotation curve is faster than Keplerian. We detect a small (M(HI) = 5 10⁶ ) galaxy with a faint optical counterpart at ~80 kpc projected distance from NGC 864. This galaxy is probably not massive enough to have caused the perturbations in NGC 864. We discuss alternatives, such as the accretion of a gaseous companion at a radial velocity lower than the maximum.

Comments

This is the pre-published version harvested from ArXiv. The published version is located at http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361:20052743&Itemid=129

DOI

https://doi.org/10.1051/0004-6361:20052743

Pages

455-459

Volume

442

Issue

2

Recommended Citation

Espada, D; Bosma, A; Verdes-Montenegro, L; Athanassoula, E; Leon, S; Sulentic, J; and Yun, Min, "The large asymmetric HI envelope of the isolated galaxy NGC 864 (CIG 96)" (2005). Astronomy and Astrophysics. 1117.
https://doi.org/10.1051/0004-6361:20052743