For refcode 2010ApJ...714.1441S: Retrieve 527 NED objects in this reference. Please click here for ADS abstract
NED Abstract
Copyright by American Astronomical Society.
Reproduced by permission
2010ApJ...714.1441S
The Linearity of the Cosmic Expansion Field from 300 to 30,000 km s^1^
and the Bulk Motion of the Local Supercluster with Respect to the Cosmic
Microwave Background
Sandage, A.; Reindl, B.; Tammann, G. A.
Abstract. The meaning of "linear expansion" is explained. Particularly
accurate relative distances are compiled and homogenized for (1) 246 Type
Ia supernovae and 35 clusters with v < 30, 000 km s^1^, and (2)
relatively nearby galaxies with 176 tip of the redgiant branch and 30
Cepheid distances. The 487 objects define a tight Hubble diagram from
30030, 000 km s^1^ implying individual distance errors of <~7.5%. Here
the velocities are corrected for Virgocentric steaming (locally 220 km
s^1^) andif v_220_ > 3500 km s^1^for a 495 km s^1^ motion of the
Local Supercluster toward the warm cosmic microwave background (CMB) pole
at l = 275, b = 12; local peculiar motions are averaged out by large
numbers. A test for linear expansion shows that the corrected velocities
increase with distance as predicted by a standard model with q_0_ = 0.55
(corresponding to ({OMEGA}_M_, {OMEGA}_{LAMBDA}_) = (0.3, 0.7)), but the
same holdsdue to the distance limitation of the present samplefor a
range of models with q_0_ between ~0.00 and 1.00. For these models H_0_
does not vary systematically by more than +/2.3% over the entire range.
Local, distancedependent variations are equally limited to 2.3% on
average. In particular, the proposed Hubble Bubble of Zehavi et al. and
Jha et al. is rejected at the 4{sigma} level. Velocity residuals in
function of the angle from the CMB pole yield a satisfactory apex velocity
of 448 +/ 73 km s^1^ and a coherence radius of the Local Supercluster of
~3500 km s^1^ (~56 Mpc), beyond which galaxies are seen on average at
rest in comoving coordinates with respect to the CMB. Since no obvious
single accelerator of the Local Supercluster exists in the direction of
the CMB dipole, its motion must be due to the integral gravitational force
of all surrounding structures. Most of the gravitational dipole probably
come from within 5000 km s^1^.
Key words: cosmic background radiation, cosmological parameters, distance
scale, galaxies: distances and redshifts, stars: kinematics and dynamics
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