Streaming motions of galaxy clusters within 12 000 km s-1 -: V.: The peculiar velocity field

被引:140
作者
Hudson, MJ [1 ]
Smith, RJ
Lucey, JR
Branchini, E
机构
[1] Univ Waterloo, Dept Phys, Waterloo, ON N2L 3G1, Canada
[2] Univ Durham, Dept Phys, Durham DH1 3LE, England
[3] Univ Roma TRE, Dipartimento Fis, Rome, Italy
关键词
surveys; galaxies : clusters : general; galaxies : distances and redshifts; galaxies : elliptical and lenticular; cD; cosmological parameters; large-scale structure of Universe;
D O I
10.1111/j.1365-2966.2004.07893.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We analyse in detail the peculiar velocity field traced by 56 clusters within 120 h(-1) Mpc in the 'Streaming Motions of Abell Clusters' (SMAC) sample. The bulk flow of the SMAC sample is 687+/-203 km s(-1), toward l=260degrees+/-13degrees, b=0degrees+/-11degrees. We discuss possible systematic errors and show that no systematic effect is larger than half of the random error. The flow does not drop off significantly with depth, which suggests that it is generated by structures on large scales. In particular, a Great Attractor as originally proposed by Lynden-Bell et al. cannot be responsible for the SMAC bulk flow. The SMAC data suggest infall into an attractor at the location of the Shapley Concentration, but the detection is marginal (at the 90 per cent confidence level). We find that distant attractors in addition to the Shapley Concentration are required to explain the SMAC bulk flow. A comparison with peculiar velocities predicted from the IRAS Point Source Catalogue redshift (PSCz) survey shows good agreement with a best-fitting value of beta(I)=Omega(m)(0.6)/b(I)=0.39+/-0.17. However, the PSCz density field is not sufficient to account for all of the SMAC bulk motion. We also detect, at the 98 per cent confidence level, a residual bulk flow of 372+/-127 km s(-1) toward l=273degrees, b=6degrees which must be generated by sources not included in the PSCz catalogue, that is, either beyond 200 h(-1) Mpc, in the zone of avoidance or in superclusters undersampled by IRAS. Finally, we compare the SMAC bulk flow with other recent measurements. We argue that, at depths ranging from 60 to 120 h(-1) Mpc, flows of order 600 km s(-1) are excluded by multiple data sets. However, convergence to the cosmic microwave background frame by a depth of 60 h(-1) Mpc is also excluded by multiple data sets. We suggest that a bulk flow of 225 km s(-1) toward l=300degrees, b=10degrees at depths greater than 60 h(-1) Mpc is consistent with all peculiar velocity surveys, when allowance is made for sparse sampling effects.
引用
收藏
页码:61 / 75
页数:15
相关论文
共 73 条
[1]   Early-type galaxy distances from the Fundamental Plane and surface brightness fluctuations [J].
Blakeslee, JP ;
Lucey, JR ;
Tonry, JL ;
Hudson, MJ ;
Narayanan, VK ;
Barris, BJ .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2002, 330 (02) :443-457
[2]   A first comparison of the surface brightness fluctuation survey distances with the galaxy density field:: Implications for H0 and Ω [J].
Blakeslee, JP ;
Davis, M ;
Tonry, JL ;
Dressler, A ;
Ajhar, EA .
ASTROPHYSICAL JOURNAL, 1999, 527 (02) :L73-L76
[3]   A synthesis of data from fundamental plane and surface brightness fluctuation surveys [J].
Blakeslee, JP ;
Lucey, JR ;
Barris, BJ ;
Hudson, MJ ;
Tonry, JL .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2001, 327 (03) :1004-1020
[4]   A non-parametric model for the cosmic velocity field [J].
Branchini, E ;
Teodoro, L ;
Frenk, CS ;
Schmoldt, I ;
Efstathiou, G ;
White, SDM ;
Saunders, W ;
Sutherland, W ;
Rowan-Robinson, M ;
Keeble, O ;
Tadros, H ;
Maddox, S ;
Oliver, S .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1999, 308 (01) :1-28
[5]   REDDENINGS DERIVED FROM H-1 AND GALAXY COUNTS - ACCURACY AND MAPS [J].
BURSTEIN, D ;
HEILES, C .
ASTRONOMICAL JOURNAL, 1982, 87 (08) :1165-&
[6]  
CIECIELAG P, 2004, ASTROPH0401195
[7]   The peculiar motions of early-type galaxies in two distant regions - VII. Peculiar velocities and bulk motions [J].
Colless, M ;
Saglia, RP ;
Burstein, D ;
Davies, RL ;
McMahan, RK ;
Wegner, G .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2001, 321 (02) :277-305
[8]   TULLY-FISHER DISTANCES AND MOTIONS IN THE NORTHERN SKY [J].
COURTEAU, S .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1992, 104 (680) :976-976
[9]   Shellflow. I. The convergence of the velocity field at 6000 kilometers per second [J].
Courteau, S ;
Willick, JA ;
Strauss, MA ;
Schlegel, D ;
Postman, M .
ASTROPHYSICAL JOURNAL, 2000, 544 (02) :636-640
[10]  
COURTEAU S, 2001, ASTROPHYSICAL AGES T