Confronting cold dark matter predictions with observed galaxy rotations

Obreschkow, Danail, Ma, Xiangcheng, Meyer, Martin, Power, Chris, Zwaan, Martin, Staveley-Smith, Lister and Drinkwater, Michael J. (2013) Confronting cold dark matter predictions with observed galaxy rotations. Astrophysical Journal, 766 2: 1-11. doi:10.1088/0004-637X/766/2/137

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Author Obreschkow, Danail
Ma, Xiangcheng
Meyer, Martin
Power, Chris
Zwaan, Martin
Staveley-Smith, Lister
Drinkwater, Michael J.
Title Confronting cold dark matter predictions with observed galaxy rotations
Journal name Astrophysical Journal   Check publisher's open access policy
ISSN 0004-637X
Publication date 2013-04-01
Year available 2013
Sub-type Article (original research)
DOI 10.1088/0004-637X/766/2/137
Open Access Status File (Publisher version)
Volume 766
Issue 2
Start page 1
End page 11
Total pages 11
Place of publication Philadelphia, PA, United States
Publisher Institute of Physics Publishing
Collection year 2014
Language eng
Formatted abstract
The rich statistics of galaxy rotations as captured by the velocity function (VF) provide invaluable constraints on galactic baryon physics and the nature of dark matter (DM). However, the comparison of observed galaxy rotations against cosmological models is prone to subtle caveats that can easily lead to misinterpretations. Our analysis reveals full statistical consistency between ~5000 galaxy rotations, observed in line-of-sight projection, and predictions based on the standard cosmological model (ΛCDM) at the mass-resolution of the Millennium simulation (Hi line-based circular velocities above ~50 km s−1). Explicitly, the Hi linewidths in the Hi Parkes All Sky Survey (HIPASS) are found to be consistent with those in S3-SAX, a post-processed semi-analytic model for the Millennium simulation. Previously found anomalies in the VF can be plausibly attributed to (1) the masslimit of the Millennium simulation, (2) confused sources in HIPASS, (3) inaccurate inclination measurements for optically faint sources, and (4) the non-detectability of gas-poor early-type galaxies. These issues can be bypassed by comparing observations and models using linewidth source counts rather than VFs. We investigate if and how well such source counts can constrain the temperature of DM.
Keyword Dark matter
Galaxies: kinematics and dynamics
Galaxies: statistics
ISM: atoms
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article # 137

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 13 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 14 times in Scopus Article | Citations
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