Restframe I-band Hubble diagram for type Ia supernovae up toredshift z ~; 0.5

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We present a novel technique for fitting rest frame I-bandlight curves on a data set of 42 type Ia supernovae (SNe Ia). Using the result of the fit, we construct a Hubble diagram with 26 SNe from the subset at 0.01 < z < 0.1. Adding two SNe at z {approx} 0.5 yields results consistent with a flat Lambda-dominated ''concordance universe'' (OmegaM,Omega Lambda) = (0.25, 0.75). For one of these, SN 2000fr, new near infrared data are presented. The high redshift supernova NIR data are also used to test for systematic effects in the use of SNe Ia as distance ... continued below

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Nobili, S.; Amanullah, R.; Garavini, G.; Goobar, A.; Lidman, C.; Stanishev, V. et al. April 1, 2005.

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We present a novel technique for fitting rest frame I-bandlight curves on a data set of 42 type Ia supernovae (SNe Ia). Using the result of the fit, we construct a Hubble diagram with 26 SNe from the subset at 0.01 < z < 0.1. Adding two SNe at z {approx} 0.5 yields results consistent with a flat Lambda-dominated ''concordance universe'' (OmegaM,Omega Lambda) = (0.25, 0.75). For one of these, SN 2000fr, new near infrared data are presented. The high redshift supernova NIR data are also used to test for systematic effects in the use of SNe Ia as distance estimators. A flat, Lambda = 0, universe where the faintness of supernovae at z {approx} 0.5 is due to grey dust homogeneously distributed in the intergalactic medium is disfavored based on the high-z Hubble diagram using this small data-set. However, the uncertainties are large and no firm conclusion may be drawn. We explore the possibility of setting limits on intergalactic dust based on B - I and B - V color measurements, and conclude that about 20 well measured SNe are needed to give statistically significant results. We also show that the high redshift restframe I-band data points are better fit by light curve templates that show a prominent second peak, suggesting that they are not intrinsically underluminous.

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  • Journal Name: Astronomy and Astrophysics; Journal Volume: 437; Related Information: Journal Publication Date: 04/01/2005

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  • Report No.: LBNL--58330
  • Grant Number: DE-AC02-05CH11231
  • Grant Number: NASA:43CX01
  • DOI: 10.1051/0004-6361:20042463 | External Link
  • Office of Scientific & Technical Information Report Number: 860914
  • Archival Resource Key: ark:/67531/metadc780536

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  • April 1, 2005

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  • Dec. 3, 2015, 9:30 a.m.

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  • April 1, 2016, 7:48 p.m.

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Nobili, S.; Amanullah, R.; Garavini, G.; Goobar, A.; Lidman, C.; Stanishev, V. et al. Restframe I-band Hubble diagram for type Ia supernovae up toredshift z ~; 0.5, article, April 1, 2005; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc780536/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.