期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 437, 期 2, 页码 1996-2004出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt2038
关键词
methods: data analysis; methods: statistical; galaxies: kinematics and dynamics; cosmology: observations; large-scale structure of Universe
资金
- CITA National Fellowship
- Natural Science and Engineering Research Council of Canada
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 degrees +/- 7 degrees, b = 8 degrees(+ 6 degrees)(-5 degrees) 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.
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