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

D. T.F. Weldrake; W. J.G. De Blok; F. Walter

doi:10.1046/j.1365-8711.2003.06170.x

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

D. T.F. Weldrake^*, W. J.G. De Blok, F. Walter

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

137 Citations (Scopus)

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.

Original language	English
Pages (from-to)	12-28
Number of pages	17
Journal	Monthly Notices of the Royal Astronomical Society
Volume	340
Issue number	1
DOIs	https://doi.org/10.1046/j.1365-8711.2003.06170.x
Publication status	Published - 21 Mar 2003

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title = "A high-resolution rotation curve of NGC 6822: A test-case for cold dark matter",

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.",

keywords = "Dark matter, Galaxies: Dwarf, Galaxies: Individual: NGC 6822, Galaxies: Kinematics and dynamics, Galaxies: fundamental parameters, Local group",

author = "Weldrake, {D. T.F.} and {De Blok}, {W. J.G.} and F. Walter",

year = "2003",

month = mar,

day = "21",

doi = "10.1046/j.1365-8711.2003.06170.x",

language = "English",

volume = "340",

pages = "12--28",

journal = "Monthly Notices of the Royal Astronomical Society",

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TY - JOUR

T1 - A high-resolution rotation curve of NGC 6822

T2 - A test-case for cold dark matter

AU - Weldrake, D. T.F.

AU - De Blok, W. J.G.

AU - Walter, F.

PY - 2003/3/21

Y1 - 2003/3/21

N2 - 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.

AB - 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.

KW - Dark matter

KW - Galaxies: Dwarf

KW - Galaxies: Individual: NGC 6822

KW - Galaxies: Kinematics and dynamics

KW - Galaxies: fundamental parameters

KW - Local group

UR - http://www.scopus.com/inward/record.url?scp=0041833506&partnerID=8YFLogxK

U2 - 10.1046/j.1365-8711.2003.06170.x

DO - 10.1046/j.1365-8711.2003.06170.x

M3 - Article

SN - 0035-8711

VL - 340

SP - 12

EP - 28

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

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

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