MNRAS-2001-Sharpe-121-30.pdf (305.68 kB)
Predicting the peculiar velocities of nearby PSCz galaxies using the Least Action Principle
journal contribution
posted on 2023-06-08, 08:39 authored by J Sharpe, M Rowan-Robinson, A Canavezes, W Saunders, E Branchini, G Efstathiou, C Frenk, O Keeble, R G McMahon, S Maddox, Seb OliverSeb Oliver, W Sutherland, H Tadros, S D M WhiteWe use the Least Action Principle to predict the peculiar velocities of PSCz galaxies inside cz=2000 km s-1. Linear theory is used to account for tidal effects to cz=15 000 km s-1, and we iterate galaxy positions to account for redshift distortions. As the Least Action Principle is valid beyond linear theory, we can predict reliable peculiar velocities even for very nearby galaxies (i.e., cz=500 km s-1). These predicted peculiar velocities are then compared with the observed velocities of 12 galaxies with Cepheid distances. The combination of the PSCz galaxy survey (with its large sky coverage and uniform selection) with the accurate Cepheid distances makes this comparison relatively free from systematic effects. We find that galaxies are good tracers of the mass, even at small (=10 h-1 Mpc) scales; under the assumption of no biasing, 0.25=ß=0.75 (at 90 per cent confidence). We use the reliable predicted peculiar velocities to estimate the Hubble constant H0 from the local volume without ‘stepping up’ the distance ladder, finding a confidence range of 65–75 km s-1 Mpc-1 (at 90 per cent confidence).
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Publication status
- Published
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- Published version
Journal
Monthly Notices of the Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
Issue
1Volume
322Page range
121-130Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06First Open Access (FOA) Date
2016-03-22First Compliant Deposit (FCD) Date
2016-11-16Usage metrics
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