Using Supernovae from a Large Imaging Survey to Measure Peculiar Velocities: Cosmological Implications

Details Using Supernovae from a Large Imaging Survey to Measure Peculiar Velocities: Cosmological Implications Using Supernovae from a Large Imaging Survey to Measure Peculiar Velocities: Cosmological Implications

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348104b&link_type=abstract

American Astronomical Society, AAS Meeting #213, #481.04; Bulletin of the American Astronomical Society, Vol. 41, p.448

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We propose to use a future, wide area photometric survey of type Ia Supernovae to measure the mean pairwise velocity of the their host galaxies. Proposed imaging surveys such as the LSST will repeatedly scan large areas of sky and will yield large samples (105-106) of SNe Ia. Type Ia supernovae are excellent standard candles and hence give a distance measure to their host galaxies. We show that using light-curve measurements of a large sample of type Ia supernovae, combined with photometric redshifts for either the supernovae or their host galaxies, it is possible to measure the mean pairwise velocity of the host galaxies with 2-3σ errors over a cosmological volume out to redshift of z ˜ 1. Such measurements require no additional observational efforts beyond the traditional luminosity distance test, and provide constraints on the dark energy parameters that are complementary to the constraints provided by the luminosity distance measurements. We find that when the velocity measurements are combined with the supernova distance measurements and the priors from cosmic microwave background experiments, the constraint on the dark energy density improves by a factor of 3 and the dark energy figure of merit improves by a factor of 2.

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