Open AccessA comparison of local Type Ia supernovae with the IRAS PSC z gravity field
Author(s) -
RadburnSmith D. J.,
Lucey J. R.,
Hudson M. J.
Publication year - 2004
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 - 10.1111/j.1365-2966.2004.08420.x
Subject(s) - physics , cmb cold spot , supernova , astrophysics , galaxy , extinction (optical mineralogy) , type (biology) , data set , astronomy , cosmic microwave background , statistics , optics , ecology , anisotropy , biology , mathematics
We compare the measured peculiar velocities of 98 local (<150 h −1 Mpc) Type Ia supernovae with predictions derived from the IRAS PSC z survey. There is excellent agreement between the two data sets, with a best‐fitting β I (=Ω 0.6 m / b I ) of 0.55 ± 0.06 . Subsets of the supernovae data set are further analysed, and the above result is found to be robust with respect to culls by distance, host‐galaxy extinction and choice of reference frame in which the analysis is carried out. Alternative methods of determining β I including density–density comparisons, dipole measurements and WMAP ‐based results are also discussed. We conclude that most recent determinations are consistent with a value of β I = 0.5 .