Open AccessLarge‐Scale Coherent Dipole Anisotropy?
Author(s) -
Basilakos S.,
Plionis M.
Publication year - 1998
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.1998.01701.x
Subject(s) - physics , dipole , astrophysics , anisotropy , galaxy , cosmic microwave background , optics , quantum mechanics
We have reanalysed and compared the dipoles of the 1.2‐Jy and 0.6‐Jy (QDOT) IRAS galaxy samples. We find strong indications from both samples for (a) significant contributions to the gravitational field that shapes the Local Group motion from depths up to ∼ 170 h −1 Mpc and (b) a large‐scale coherence of the dipole anisotropy, indications provided mainly by the fact that the differential dipoles of large equal‐volume shells are aligned with the CMB dipole and exhibit significant dipole signals. The two IRAS dipoles are indistinguishable within 50 h −1 Mpc and beyond ∼ 130 h −1 Mpc while the QDOT dipole, having a lower flux limit, continues growing with respect to the 1.2‐Jy sample up to ∼ 100 h −1 Mpc in agreement with Rowan‐Robinson et al.