Peculiar velocities in 6dFGS : J/MNRAS/445/2677

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Authors : Springob C.M. orcid , Magoulas C., Colless M. (hide) , Magoulas C., Colless M. et..al

VizieR DOI : 10.26093/cds/vizier.74452677
Bibcode : 2014MNRAS.445.2677S (ADS) (Simbad) (Objects)
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CDS Keywords : Surveys; Galaxies, nearby; Redshifts
UAT : Surveys, Galaxies, Redshifted

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Inserted into VizieR : 21-Oct-2015
Last modification : 14-Aug-2024

The 6dF Galaxy Survey peculiar velocity field and cosmography. (2014)

Keywords : surveys - galaxies elliptical and lenticular, cD - galaxies: fundamental parameters - cosmology: distance scale - cosmology: large-scale structure of Universe

Abstract:We derive peculiar velocities for the 6dF Galaxy Survey (6dFGS) and describe the velocity field of the nearby (z<0.055) Southern hemisphere. The survey comprises 8885 galaxies for which we have previously reported Fundamental Plane data. We obtain peculiar velocity probability distributions for the redshift-space positions of each of these galaxies using a Bayesian approach. Accounting for selection bias, we find that the logarithmic distance uncertainty is 0.11 dex, corresponding to 26 per cent in linear distance. We use adaptive kernel smoothing to map the observed 6dFGS velocity field out to cz~16000km/s, and compare this to the predicted velocity fields from the PSCz Survey and the 2MASS Redshift Survey. We find a ...(more)
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Monthly Notices policies
The details of the sample selection and data reduction are presented in Magoulas et al. (2012MNRAS.427..245M) and Campbell et al. (2014MNRAS.443.1231C, Cat. J/MNRAS/443/1231). In brief, the 6dFGSv includes all 6dFGS early-type galaxies with spectral signal-to-noise ratios greater than 5, heliocentric redshift z_helio_<0.055, velocity dispersion greater than 112km/s, and J-band total magnitude brighter than m_J_=13.65. The galaxies were identified as 'early-type' by matching the observed spectrum, via cross-correlation, to template galaxy spectra. They include both ellipticals and spiral bulges (in cases where the bulge fills the 6dF fibre). Each galaxy image was subsequently examined by eye, and galaxies were removed from the sample in cases where the morphology was peculiar, the galaxy had an obvious dust lane, or the fibre aperture was contaminated by the galaxy's disc (if present), or by a star or another galaxy. 


                


                

                    

                


                

                    

                


                

                    
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