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

Abstract

Catalog with I-band photometry, SFI++. These samples contain peculiar velocities for ~3000 and ~4000objects, respectively. Based on a sub-sample of ~1000 common very inclined galaxies, we reach the following conclusions. Irrespective of high (SFI++)

Yet another sample of RFGC galaxies

“…It can be clearly seen that the apex travels in the same direction with the improvement of the sample. As a result, the apex deviated from the results of most authors (red lowercase letters in Figure 1) and became closer to the results of Lauer & Postman (1994). However, the obtained value of the bulk flow velocity 278 km s −1 is much smaller then that given by Lauer & Postman (1994) and is consistent with ΛCDM cosmology.…”

“…The ΛCDM model estimates it at the level ∼ 250 km s −1 at the scale 100h −1 Mpc. However, in some studies, for example Lauer & Postman (1994); Watkins et al (2009);Feldman et al (2010), the obtained values were larger by a factor of 2. The largest value of 416 ± 79 km s −1 was given by Feldman et al (2010).…”

“…The new data were taken from the SFI++ II survey (Springob et al 2007), 3 releases of the ALFALFA survey (Giovanelli et al 2007;Kent et al 2008;Martin et al 2009) and the 40ALFA survey (Haynes et al 2011), which contains about 40% of data to enter the final version of the ALFALFA survey. Some results of RFGC galaxies observation at the Effelsberg radio telescope were taken from the papers (Mitronova et al 2005;Kudrya et al 2009). From all other sources only one measurement was included in this sample from the paper (Kovač et al 2009), which contains the results of a blind survey in the Canes Venatici region.…”

COSMICFLOWS-2: THE DATA

“…For all the concern that we have about inclinations, it is comforting that with tests involving cluster samples (galaxies assumed to be at the same distance) discussed by Tully & Courtois (2012) there are no TFR systematics or increase in scatter over the full range of inclinations from 45 • to 90 • . Nonetheless, the issue of inclination corrections is sufficiently disconcerting that we are attracted to a particular sample that eliminates the problem: galaxies from the various incarnations of the Flat Galaxy Catalog (Karachentsev et al 1993(Karachentsev et al , 1999Mitronova et al 2004;Kudrya et al 2003Kudrya et al , 2009. These galaxies are all seen extremely edge-on.…”

AN UNBIASED METHOD OF MODELING THE LOCAL PECULIAR VELOCITY FIELD WITH TYPE Ia SUPERNOVAE

“…Finally, with the Square Kilometer Array (SKA) (Dewdney et al 2009) we expect TF catalogs to grow out to larger distances using less HI in the near future. Using TF derived peculiar velocities, measurements of the bulk flow and shear moments have been made (Giovanelli et al 1998;Dale et al 1999b;Courteau et al 2000;Kudrya et al 2003;Feldman & Watkins 2008;Kudrya et al 2009;Nusser & Davis 2011) and cosmological parameters have been constrained (da Costa et al 1998;Freudling et al 1999;Borgani et al 2000;Branchini et al 2001;Pike & Hudson 2005;Masters et al 2006;Park & Park 2006;Abate & Erdogdu 2009;Davis et al 2010a).…”