Journal Article

An estimation of local bulk flow with the maximum-likelihood method

Yin-Zhe Ma and Jun Pan

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 437, issue 2, pages 1996-2004
Published in print January 2014 | ISSN: 0035-8711
Published online November 2013 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1093/mnras/stt2038
An estimation of local bulk flow with the maximum-likelihood method

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A maximum-likelihood method, tested as an unbiased estimator from numerical simulations, is used to estimate cosmic bulk flow from peculiar velocity surveys. The likelihood function is applied to four observational catalogues (ENEAR, SFI++, A1SN and SC) constructed from galaxy peculiar velocity surveys and Type Ia supernovae data at low redshift (z ≤ 0.03). We find that the Spiral Field I-band catalogue constrains the bulk flow to be V = 290 ± 30 km s−1 towards l = 281° ± 7°, [math] on effective scales of 58 h−1 Mpc, which is the tightest constraints achievable at the present time. By comparing the amplitudes of our estimated bulk flows with theoretical prediction, we find excellent agreement between the two. In addition, directions of estimated bulk flows are also consistent with measurements in other studies.

Keywords: methods: data analysis; methods: statistical; galaxies: kinematics and dynamics; cosmology: observations; large-scale structure of Universe

Journal Article.  6205 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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