Journal Article

Cosmic flows in the nearby universe from Type Ia supernovae

Stephen J. Turnbull, Michael J. Hudson, Hume A. Feldman, Malcolm Hicken, Robert P. Kirshner and Richard Watkins

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 420, issue 1, pages 447-454
Published in print February 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI:
Cosmic flows in the nearby universe from Type Ia supernovae

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Peculiar velocities are one of the only probes of very large scale mass density fluctuations in the nearby Universe. We present new ‘minimal variance’ bulk flow measurements based upon the ‘First Amendment’ compilation of 245 Type Ia supernovae (SNe) peculiar velocities and find a bulk flow of 249 ± 76 km s−1 in the direction l= 319°± 18°, b= 7°± 14°. The SNe bulk flow is consistent with the expectations of Λ cold dark matter (ΛCDM). However, it is also marginally consistent with the bulk flow of a larger compilation of non-SNe peculiar velocities. By comparing the SNe peculiar velocities to predictions of the IRAS Point Source Catalogue Redshift Survey (PSCz) galaxy density field, we find Ω0.55mσ8,lin= 0.40 ± 0.07, which is in agreement with ΛCDM. However, we also show that the PSCz density field fails to account for 150 ± 43 km s−1 of the SNe bulk motion.

Keywords: supernovae: general; cosmological parameters; cosmology: observations; dark matter; large-scale structure of Universe

Journal Article.  6485 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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