Cosmic flows in the nearby universe from Type Ia supernovae

dc.contributor.authorTurnbull, Stephen J.
dc.contributor.authorHudson, Michael J.
dc.contributor.authorFeldman, Hume A.
dc.contributor.authorHicken, Malcolm
dc.contributor.authorKirshner, Robert P.
dc.contributor.authorWatkins, Richard
dc.date.accessioned2018-12-12T22:46:13Z
dc.date.available2018-12-12T22:46:13Z
dc.date.issued2012-01-23
dc.description.abstractPeculiar 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.en_US
dc.identifier.citationStephen J. Turnbull, Michael J. Hudson, Hume A. Feldman, Malcolm Hicken, Robert P. Kirshner, Richard Watkins; Cosmic flows in the nearby universe from Type Ia supernovae, Monthly Notices of the Royal Astronomical Society, Volume 420, Issue 1, 11 February 2012, Pages 447–454, https://doi.org/10.1111/j.1365-2966.2011.20050.xen_US
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/10177/6266
dc.language.isoen_USen_US
dc.publisherOxford Academicen_US
dc.subjectsupernovaeen_US
dc.subjectcosmologyen_US
dc.titleCosmic flows in the nearby universe from Type Ia supernovaeen_US
dc.typeArticleen_US

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