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A high-resolution rotation curve of NGC 6822: a test-case for cold dark matter

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Date

2003

Authors

Weldrake, David
Walter, F
de Blok, Willem

Journal Title

Journal ISSN

Volume Title

Publisher

Blackwell Publishing Ltd

Abstract

We present high-resolution rotation curves of the Local Group dwarf irregular galaxy NGC 6822 obtained with the Australia Telescope Compact Array. Our best curves have an angular resolution of 8 arcsec or 20 pc and contain some 250 independent points. The stellar and gas components of NGC 6822 cannot explain the shape of the curve, except for the very inner regions, and NGC 6822 is consequently very dark-matter-dominated. There is no evidence for the presence of a steep density cusp down to scales of ∼20 pc, contrary to the predictions of cold dark matter.

Description

Keywords

Keywords: Dark matter; Galaxies: Dwarf; Galaxies: fundamental parameters; Galaxies: Individual: NGC 6822; Galaxies: Kinematics and dynamics; Local group

Citation

URI

http://hdl.handle.net/1885/19849

Collections

ANU Research Publications

Source

Monthly Notices of the Royal Astronomical Society

Type

Journal article

Book Title

Entity type

Access Statement

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DOI

10.1046/j.1365-8711.2003.06170.x

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