Is There Evidence for a Hubble Bubble? The Nature of SN Ia Colors And Dust in External Galaxies

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We examine recent evidence from the luminosity-redshift relation of Type Ia Supernovae for the {approx} 3 {sigma} detection of a ''Hubble bubble'' -- a departure of the local value of the Hubble constant from its globally averaged value. By comparing the MLCS2k2 fits used in that study to the results from other light-curve fitters applied to the same data, we demonstrate that this is related to the interpretation of SN color excesses (after correction for a light-curve shape-color relation) and the presence of a color gradient across the local sample. If the slope of the linear relation ({beta}) between SN ... continued below

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Conley, A.; Carlberg, R. G.; Guy, J.; Howell, D. A.; Jha, S.; Riess, A. G. et al. June 6, 2007.

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We examine recent evidence from the luminosity-redshift relation of Type Ia Supernovae for the {approx} 3 {sigma} detection of a ''Hubble bubble'' -- a departure of the local value of the Hubble constant from its globally averaged value. By comparing the MLCS2k2 fits used in that study to the results from other light-curve fitters applied to the same data, we demonstrate that this is related to the interpretation of SN color excesses (after correction for a light-curve shape-color relation) and the presence of a color gradient across the local sample. If the slope of the linear relation ({beta}) between SN color excess and luminosity is fit empirically, then the bubble disappears. If, on the other hand, the color excess arises purely from Milky-Way like dust, then SN data clearly favors a Hubble bubble. We demonstrate that SN data give {beta} {approx} 2, instead of the {beta} {approx} 4 one would expect from purely Milky-Way-like dust. This suggests that either SN intrinsic colors are more complicated than can be described with a single light-curve shape parameter, or that dust around SN is unusual. Disentangling these possibilities is both a challenge and an opportunity for large-survey SN Ia cosmology.

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  • Journal Name: Astrophys.J.664:L13-L16,2007; Journal Volume: 664

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  • Report No.: SLAC-PUB-12548
  • Grant Number: AC02-76SF00515
  • DOI: 10.1086/520625 | External Link
  • Office of Scientific & Technical Information Report Number: 908571
  • Archival Resource Key: ark:/67531/metadc884198

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  • June 6, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • July 26, 2017, 9:43 a.m.

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Conley, A.; Carlberg, R. G.; Guy, J.; Howell, D. A.; Jha, S.; Riess, A. G. et al. Is There Evidence for a Hubble Bubble? The Nature of SN Ia Colors And Dust in External Galaxies, article, June 6, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc884198/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.