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Distances and peculiar velocities of spiral galaxies in the 2MFGC and SFI++ samples | | Yu.N.Kudrya
; V.E. Karachentseva
; I.D. Karachentsev
; S.N.Mitronova
; W.K.Huchtmeier
; | | Date: |
22 Nov 2008 | | Abstract: | We compare infrared Tully-Fisher (TF) distances and peculiar velocities
derived for spiral galaxies from the two largest datasets: the 2MASS selected
Flat Galaxy Catalog, 2MFGC [19, 20] and the Arecibo General Catalog with I-band
photometry, SFI++ [30,7]. These samples contain peculiar velocities for ~3000
and ~4000 objects, respectively. Based on a sub-sample of ~1000 common deeply
inclined galaxies, we reach the following conclusions. Irrespective to high
(SFI++) or low (2MFGC) quality of the used photometric data, about 10% of the
galaxies in both samples deviate considerably from the main body of the TF
relation. After their deletion, the standard TF scatters drops to 0.47^m
(2MFGC) and 0.40^m (SFI++). The TF distances, derived from two the samples,
demonstrate a high degree of mutual agreement with a correlation coefficient
o=+0.95 and sigma(H_0r)=837 km/s. Peculiar velocities of the galaxies are
also correlated with
o=0.56-0.59 and sigma(V_pec)=610 km/s. We find that the
bulk motion of the 2MFGC and SFI++ galaxies on a typical scale of H_0r~5700
km/s can be represented by a dipole solution with the amplitude V=297+/-23 km/s
directed towards l=292+/-4 degr., b=-12+/-3 degr., being only slightly
sensitive to different modifications of the TF relaton. | | Source: | arXiv, 0811.3690 | | Services: | Forum | Review | PDF | Favorites | |
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