The Sloan Digital Sky Survey Peculiar Velocity Catalogue
Cullan Howlett, Khaled Said, John R. Lucey, Matthew Colless, Fei Qin,, Yan Lai, R. Brent Tully, Tamara M. Davis

TL;DR
This paper introduces the largest peculiar velocity catalogue from SDSS data, providing new insights into galaxy motions up to redshift 0.1 and enabling studies of cosmic flows and environmental effects.
Contribution
It presents a comprehensive SDSS-based Fundamental Plane peculiar velocity catalogue with improved calibration, validation, and a novel method to correct for environmental biases.
Findings
Largest PV sample to date with 34,059 galaxies
Detected a potential environmental dependence in the FP
Preliminary bulk flow measurements suggest larger-than-expected motions
Abstract
We present a new catalogue of distances and peculiar velocities (PVs) of early-type galaxies derived from Fundamental Plane (FP) measurements using data from the Sloan Digital Sky Survey (SDSS). This homogeneous sample comprises the largest set of peculiar velocities produced to date and extends the reach of PV surveys up to a redshift limit of . Our SDSS-based FP distance measurements have a mean uncertainty of 23%. Alongside the data, we produce an ensemble of 2,048 mock galaxy catalogues that reproduce the data selection function, and are used to validate our fitting pipelines and check for systematic errors. We uncover a significant trend between group richness and mean surface brightness within the sample, which may hint at an environmental dependence within the FP or the presence of unresolved systematics, and can result in biased peculiar…
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