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Constraining Dust and Color Variations of High-z SNe Using NICMOS on the Hubble Space Telescope
Stockholm University, Faculty of Science, Department of Physics. (CoPS)
Stockholm University, Faculty of Science, Department of Physics. (CoPS)
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2009 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 700, 1415-1427 p.Article in journal (Refereed) Published
Abstract [en]

We present data from the Supernova Cosmology Project for five high redshift Type Ia supernovae (SNe Ia) that were obtained using the NICMOS infrared camera on the Hubble Space Telescope. We add two SNe from this sample to a rest-frame I-band Hubble diagram, doubling the number of high redshift supernovae on this diagram. This I-band Hubble diagram is consistent with a flat universe (ΩM, ΩΛ) = (0.29, 0.71). A homogeneous distribution of large grain dust in the intergalactic medium (replenishing dust) is incompatible with the data and is excluded at the 5σ confidence level, if the SN host galaxy reddening is corrected assuming RV = 1.75. We use both optical and infrared observations to compare photometric properties of distant SNe Ia with those of nearby objects. We find generally good agreement with the expected color evolution for all SNe except the highest redshift SN in our sample (SN 1997ek at z = 0.863) which shows a peculiar color behavior. We also present spectra obtained from ground-based telescopes for type identification and determination of redshift. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute. STScI is operated by the association of Universities for Research in Astronomy, Inc. under the NASA contract NAS 5-26555. The observations are associated with program GO-07850.

Place, publisher, year, edition, pages
2009. Vol. 700, 1415-1427 p.
Keyword [en]
cosmology: observations, cosmological parameters, supernovae: general
URN: urn:nbn:se:su:diva-48738DOI: 10.1088/0004-637X/700/2/1415ISI: 000268098100042OAI: diva2:375845
Available from: 2010-12-09 Created: 2010-12-09 Last updated: 2011-03-29Bibliographically approved

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Nobili, SerenaAmanullah, RahmanGoobar, Ariel
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