Distances and peculiar velocities of spiral galaxies in the 2MFGC and SFI++ samples Export

@article{citeulike:3683132, 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 \ro=+0.95 and \sigma(H\_0r)=837 km/s. Peculiar velocities of the galaxies are also correlated with \ro=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.}, archivePrefix = {arXiv}, author = {Yu and Karachentseva, V. E. and Karachentsev, I. D. and Mitronova, S. N. and Huchtmeier, W. K.}, citeulike-article-id = {3683132}, citeulike-linkout-0 = {http://arxiv.org/abs/0811.3690}, citeulike-linkout-1 = {http://arxiv.org/pdf/0811.3690}, day = {22}, eprint = {0811.3690}, keywords = {distances, galaxies, peculiar, spiral, velocities}, month = {Nov}, posted-at = {2008-11-25 09:37:25}, priority = {2}, title = {Distances and peculiar velocities of spiral galaxies in the 2MFGC and SFI++ samples}, url = {http://arxiv.org/abs/0811.3690}, year = {2008} }

TY - JOUR ID - citeulike:3683132 L3 - citeulike-article-id:3683132 N2 - 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 \ro=+0.95 and \sigma(H_0r)=837 km/s. Peculiar velocities of the galaxies are also correlated with \ro=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. TI - Distances and peculiar velocities of spiral galaxies in the 2MFGC and SFI++ samples KW - distances KW - galaxies KW - peculiar KW - spiral KW - velocities AU - Yu AU - Karachentseva, VE AU - Karachentsev, ID AU - Mitronova, SN AU - Huchtmeier, WK PY - 2008/Nov/22/ UR - http://arxiv.org/abs/0811.3690 ER -