Sign on
ADS Classic is now deprecated. It will be completely retired in October 2019. This page will automatically redirect to the new ADS interface at that point.

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· References in the article
· Citations to the Article (2) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
· Translate This Page
Hoag's object, remnant of a vanished bar?
Freeman, Tarsh; Howard, Sethanne; Byrd, Gene G.
AA(Bevill State Community College, Jasper, AL, USA), AB(5526 Green Dory Lane, 21044, Columbia, MD, USA), AC(Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL, USA)
Celestial Mechanics and Dynamical Astronomy, Volume 108, Issue 1, pp.23-34 (CeMDA Homepage)
Publication Date:
Ring galaxies, Structure, Hoag's Object
Abstract Copyright:
(c) 2010: Springer Science+Business Media B.V.
Bibliographic Code:


The beautiful ringed Hoag's object, named after its discoverer, is an interesting galaxy. Because of the roundness of its ring-like structure, it has been proposed to be a collisional ring galaxy; however, there is no obvious nearby culprit galaxy that could have collided with it. Considering an alternative, much gentler hypothesis, we study the development of the observed structure via a turning, bar perturbation in the disk potential. However, there is currently no obvious bar present, and rings produced by bars are typically oval. On the basis of much recent work improving our understanding of bar evolution, we assume the bar grows and then vanishes. In simulations of a disk of particles, under such a bar turning in the disk plane, we obtain a bulge core, empty void, and circular ring in the disk that mimic the observations of Hoag's object. We conclude the inner edge of the ring is just beyond the outer Lindblad resonance (OLR) with the bar pattern speed. We estimate the amount of gas mass in the bulge core to be twice that of the ring. Our simulations indicate that the Hoag Object ring could survive at least 6 billion years after the bar vanishes.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

Find Similar Abstracts:

Use: Authors
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
arXiv e-prints