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• W2896768680 abstract "The low-order kinematic moments of galaxies, namely bulk flow and shear, enables us to test whether theoretical models can accurately describe the evolution of the mass density field in the nearby Universe. We use the so-called etaMLE maximum likelihood estimator in logdistance space to measure thesemoments from a combined sample of the 2MASS Tully-Fisher (2MTF) survey and the COSMICFLOWS-3 (CF3) compilation. Galaxies common between 2MTF and CF3 demonstrate a small zero-point difference of -0.016+-0.002 dex.We test the etaMLE on 16 mock 2MTF survey catalogues in order to explore how well the etaMLE recovers the true moments, and the effect of sample anisotropy. On the scale size of 37 Mpc/h, we find that the bulk flow of the local Universe is 259 +- 15 km/h in the direction is (l,b)=(300+-4, 23+-3) (Galactic coordinates). The average shear amplitude is 1.7+-0.4 h km/s/Mpc. We use a variable window function to explore the bulk and shear moments as a function of depth. In all cases, the measurements are consistent with the predictions of the L cold dark matter (LCDM) model." @default.
• W2896768680 created "2018-10-26" @default.
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• W2896768680 date "2018-10-22" @default.
• W2896768680 modified "2023-10-18" @default.
• W2896768680 title "Bulk flow and shear in the local Universe: 2MTF and <scp>cosmicflows-3</scp>" @default.
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• W2896768680 doi "https://doi.org/10.1093/mnras/sty2826" @default.
• W2896768680 hasPublicationYear "2018" @default.
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