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SPECTRA AND<i>HUBBLE SPACE TELESCOPE</i>LIGHT CURVES OF SIX TYPE Ia SUPERNOVAE AT 0.511 &lt;<i>z</i>&lt; 1.12 AND THE UNION2 COMPILATION

R. AmanullahDepartment of Physics, Stockholm University, Albanova University Center, SE-106 91 Stockholm, SwedenC. LidmanThe Oskar Klein Centre for Cosmoparticle Physics, Department of Physics, AlbaNova, Stockholm University, SE-106 91 Stockholm, SwedenD. RubinDepartment of Physics, University of California Berkeley, Berkeley, CA 94720-7300, USAG. AlderingE. O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAP. AstierLPNHE, Universit Pierre et Marie Curie ParisK. BarbaryDepartment of Physics, University of California Berkeley, Berkeley, CA 94720-7300, USAM. S. Burns, Universit Paris Diderot ParisA. Conley, CNRS-IN2P3, 4 place Jussieu, 75005 Paris, FranceKyle DawsonDepartment of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, USASusana E. DeustuaSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAMamoru DoiS. FabbroDepartment of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC V8W 3P6, CanadaL. FaccioliE. O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAH. K. FakhouriDepartment of Physics, University of California Berkeley, Berkeley, CA 94720-7300, USAG. FolatelliObservatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 9110, USAA. S. FruchterSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAHisanori FurusawaNational Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, JapanG. GaraviniDepartment of Physics, Stockholm University, Albanova University Center, SE-106 91 Stockholm, SwedenG. GoldhaberDepartment of Physics, University of California Berkeley, Berkeley, CA 94720-7300, USAA. GoobarDepartment of Physics, Stockholm University, Albanova University Center, SE-106 91 Stockholm, SwedenD. E. GroomE. O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAI. HookINAF-Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio (RM), ItalyD. A. HowellDepartment of Physics, University of California, Santa Barbara, Broida Hall, Mail Code 9530, Santa Barbara, CA 93106-9530, USANobunari KashikawaNational Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, JapanA. G. KimE. O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAR. A. KnopM. KowalskiPhysikalisches Institut, Universitt Bonn, Nussallee 12, D-53115 Bonn, GermanyE. LinderSpace Sciences Laboratory, University of California Berkeley, Berkeley, CA 94720, USAJ. MeyersDepartment of Physics, University of California Berkeley, Berkeley, CA 94720-7300, USATomoki MorokumaNational Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, JapanS. NobiliDepartment of Physics, Stockholm University, Albanova University Center, SE-106 91 Stockholm, SwedenJ. NordinDepartment of Physics, Stockholm University, Albanova University Center, SE-106 91 Stockholm, SwedenP. NugentE. O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAL. ÖstmanDepartment of Physics, Stockholm University, Albanova University Center, SE-106 91 Stockholm, SwedenR. PainLaboratoire de Physique Nucléaire et de Hautes ÉnergiesN. PanagiaSupernova Ltd., OYV #131, Northsound Road, Virgin Gorda, British Virgin IslandsS. PerlmutterDepartment of Physics, University of California Berkeley, Berkeley, CA 94720-7300, USAJ. RauxLPNHE, Universit Pierre et Marie Curie ParisP. Ruiz‐LapuenteDepartment of Astronomy, University of Barcelona, Barcelona, SpainA. L. SpadaforaE. O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAM. StrovinkDepartment of Physics, University of California Berkeley, Berkeley, CA 94720-7300, USAN. SuzukiE. O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAL. WangDepartment of Physics, Texas A&M University, College Station, TX 77843, USAW. M. Wood‐VaseyDepartment of Physics and Astronomy, 3941 O'Hara Street, University of Pittsburgh, Pittsburgh, PA 15260, USANaoki YasudaInstitute for Cosmic Ray Research, University of Tokyo, Kashiwa 277 8582, JapanThe Supernova Cosmology Project
2010en
ABI

Аннотация

We report on work to increase the number of well-measured Type Ia supernovae (SNe Ia) at high redshifts. Light curves, including high signal-to-noise Hubble Space Telescope data, and spectra of six SNe Ia that were discovered during 2001, are presented. Additionally, for the two SNe with z > 1, we present ground-based J-band photometry from Gemini and the Very Large Telescope. These are among the most distant SNe Ia for which ground-based near-IR observations have been obtained. We add these six SNe Ia together with other data sets that have recently become available in the literature to the Union compilation. We have made a number of refinements to the Union analysis chain, the most important ones being the refitting of all light curves with the SALT2 fitter and an improved handling of systematic errors. We call this new compilation, consisting of 557 SNe, the Union2 compilation. The flat concordance CDM model remains an excellent fit to the Union2 data with the best-fit constant equation-of-state parameter w = -0.997 +0.050 -0.054 (stat) +0.077 -0.082 (stat + sys together) for a flat universe, or w = -1.038 +0.056 -0.059 (stat) +0.093 -0.097 (stat + sys together) with curvature. We also present improved constraints on w(z). While no significant change in w with redshift is detected, there is still considerable room for evolution in w. The strength of the constraints depends strongly on redshift. In particular, at z 1, the existence and nature of dark energy are only weakly constrained by the data.

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Идентификаторы

DOI
10.1088/0004-637x/716/1/712

Цитирования и источники

Цитирований: 17Использованных источников: 0
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