Peculiar velocities of 3000 spiral galaxies from the 2MFGC catalog

Abstract

The 2MFGC catalog we have used contains 18020 galaxies selected from the extended objects in the 2MASS infrared sky survey as having apparent ratios of the axes b/a < 0.3. Most of them are spiral galaxies of late morphological types whose discs are seen almost edge-on. The individual distances to the 2724 2MFGC galaxies with known rotation velocities and radial velocities are determined using a multi-parametric infrared Tully-Fisher relation. A list of the distances and peculiar velocities of these galaxies is presented. The bulk motion of the 2MFGC galaxies relative to the cosmic microwave background is characterized with the velocity V = 199±37 km/s in the direction l = 304°±11°, b = -8°±8°. Our list is currently the most representative and uniform sample for analyzing non-Hubble motion of galaxies on a scale of ~100 Mpc.

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

“…Following [20], we eliminated galaxies deviating from the regression line by more than TF σ 3 , and also galaxies with peculiar velocities in the 3K reference frame higher than 3000 km/s, assuming that such deviations are caused by observational errors, but not At the second step, after calibrating the TF relation, we determined individual galaxy distances r H 0 from (1) and (2), and calculated their individual peculiar velocities as…”

“…As a result, individual distances and peculiar velocities of 2724 2MFGC galaxies were presented in [20].…”

“…Мы сравниваем инфракрасные Талли-Фишер (TF) расстояния и пекулярные скорости, определенные для спиральных галактик из двух наибольших выборок: 2MASS каталога плоских галактик, 2MFGC [19,20] и The Arecibo General Catalog с фотометрией в І-полосе, SFI++ [30,7].…”

Multiparametric infrared Tully-Fisher relation as a tool for mapping cosmic flows

“…In later papers by the same group of authors [10,11], data from the 2MFGC catalog are used for determining the individual distances to the galaxies based on a multiparameter infrared Tully-Fisher relation and for studying collective motions of the galaxies on scales 1 0. z ≤ . They conclude that the coherent flow of the galaxies can be explained by large-scale density variations in their distribution.…”

“…* Parameters of the TFIR Sample data for this project came from the flat galaxy catalog 2MFGC[11]. A sample of galaxies with radial velocities 3000 ≤ km/s was chosen.…”