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2MTF V. Cosmography, Beta, and the residual bulk flow | | Christopher M. Springob
; Tao Hong
; Lister Staveley-Smith
; Karen L. Masters
; Lucas M. Macri
; Baerbel S. Koribalski
; D. Heath Jones
; Tom H. Jarrett
; Christina Magoulas
; Pirin Erdogdu
; | | Date: |
16 Nov 2015 | | Abstract: | Using the Tully-Fisher relation, we derive peculiar velocities for the 2MASS
Tully-Fisher Survey and describe the velocity field of the nearby Universe. We
use adaptive kernel smoothing to map the velocity field, and compare it to
reconstructions based on the redshift space galaxy distributions of the 2MASS
Redshift Survey (2MRS) and the IRAS Point Source Catalog Redshift Survey
(PSCz). With a standard $chi^2$ minimization fit to the models, we find that
the PSCz model provides a better fit to the 2MTF velocity field data than does
the 2MRS model, and provides a value of $eta$ in greater agreement with
literature values. However, when we subtract away the monopole deviation in the
velocity zeropoint between data and model, the 2MRS model also produces a value
of $eta$ in agreement with literature values. We also calculate the ’residual
bulk flow’: the component of the bulk flow not accounted for by the models.
This is $sim 250$ km/s when performing the standard fit, but drops to $sim
150$ km/s for both models when the aforementioned monopole offset between data
and models is removed. This smaller number is more in line with theoretical
expectations, and suggests that the models largely account for the major
structures in the nearby Universe responsible for the bulk velocity. | | Source: | arXiv, 1511.4849 | | Services: | Forum | Review | PDF | Favorites | |
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