OPTICAL GALAXIES WITHIN 8000 KM S(-1) .3. INHOMOGENEOUS MALMQUIST BIAS CORRECTIONS AND THE GREAT ATTRACTOR

被引:34
作者
HUDSON, MJ [1 ]
机构
[1] UNIV CAMBRIDGE,INST ASTRON,CAMBRIDGE CB3 0HA,CAMBS,ENGLAND
基金
加拿大自然科学与工程研究理事会;
关键词
METHODS; STATISTICAL; GALAXIES; DISTANCES AND REDSHIFTS; COSMOLOGY; OBSERVATIONS; LARGE-SCALE STRUCTURE OF UNIVERSE;
D O I
10.1093/mnras/266.2.468
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Malmquist bias corrections to galaxy distances depend sensitively on the underlying density field from which the distance-indicator population is assumed to have been drawn. In most previous studies of large-scale streaming motions, the density field has been assumed to be homogeneous. In this paper, inhomogeneous Malmquist bias corrections are calculated using the density field of optical galaxies within 8000 km s(-1). For E and SO galaxies in the Great Attractor region, the strong outward streaming in the foreground of the Great Attractor is not significantly affected by these new corrections. Some evidence of backside infall into the Great Attractor had previously been claimed by Dressier and Faber on the basis of the homogeneously corrected D-n-sigma peculiar velocities. It is found here that approximately 500 km s(-1) of their backside infall is due to inappropriate homogeneous Malmquist bias corrections. The best-fitting flow model to the inhomogeneously corrected D-n-sigma peculiar velocities in the CMB frame is a Great Attractor-centred infall of 266+/-51 km s(-1) at the Local Group plus a bulk dipole motion of 212+/-82 km s(-1) towards l = 316 degrees, b = 10 degrees.
引用
收藏
页码:468 / 474
页数:7
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