A Comparison of Local SNIa with the IRAS PSCz Gravity Field

Details A Comparison of Local SNIa with the IRAS PSCz Gravity Field A Comparison of Local SNIa with the IRAS PSCz Gravity Field

2004-09-23

arxiv.org/abs/astro-ph/0409551v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures. Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2004.08420.x

We compare the measured peculiar velocities of 98 local (<150/h Mpc) type Ia supernovae with predictions derived from the PSCz survey. There is excellent agreement between the two datasets with a best fit beta_I (=Omega_m^0.6/b_I) of 0.55+-0.06. Subsets of the supernovae dataset are further analysed and the above result is found to be robust with respect to culls by distance, host-galaxy extinction and to the choice of reference frame in which the analysis is carried out. Alternative methods of determining beta_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 beta_I=0.5.

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