Dust extinction and stellar confusion of the Milky Way hinder the detection of galaxies at low Galactic latitude, creating the so-called Zone of Avoidance (ZoA). This has hampered our understanding of the local dynamics, cosmic flow fields and the origin of the Cosmic Microwave Background dipole. The ZoA ($|b| \le 5^\circ$) is also excluded from the "whole-sky" Two Micron All-Sky Survey (2MASS) Redshift Survey (2MRS) and 2MASS Tully-Fisher Survey (2MTF). The latter aims to provide distances and peculiar velocities for all bright inclined 2MASS galaxies with $K_s^o$ $\leq 11\hbox{$.\!\!^{\rm m}$}25$. Correspondingly, knowledge about the density distribution in the ZoA remains limited to statistical interpolations. To improve on this bias we pursued two different surveys to fill in the southern and northern ZoA. These data will allow a direct measurement of galaxy peculiar velocities. In this paper we will present a newly derived optimized Tully-Fisher (TF) relation that allow accurate measures of galaxy distances and peculiar velocities for dust-obscured galaxies. We discuss further corrections for magnitudes and biases and present some preliminary results on flow fields in the southern ZoA.
翻译:银河的尘埃和星状混乱阻碍了在低银河纬度下探测星系,建立了所谓的避免区(ZoA),这妨碍了我们对当地动态、宇宙流场和宇宙微波背景底片来源的理解。ZoA ( ⁇ b ⁇ \le 5 ⁇ circ$)也被排除在“全天空”的两次微微全天空调查(2MASS)红色轮廓调查(2MMSS)和2MASS Tully-Fisher调查(2MTFTF)之外,后者旨在为所有亮度偏差的2MASS星系提供距离和奇异速度,以美元=o$@oqleq 11\hbox{$\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\m}$$25美元提供。关于ZoA密度分布的知识仍然局限于统计间测量。为了改进这种偏差性,我们进行了两次不同的调查,以填补南部和北部ZoA。这些数据将允许直接测量星系的星系的星系的离系的距离和直径变化。