Статья

Cosmological Results from High‐<i>z</i>Supernovae

J. TonryInstitute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822B. SchmidtThe Research School of Astronomy and Astrophysics, The Australian National University, Mount Stromlo and Siding Spring Observatories, via Cotter Road, Weston Creek PO 2611, AustraliaB. BarrisInstitute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822P. CandiaCerro Tololo Inter-American Observatory, Casilla 603, La Serena, ChilePeter ChallisHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138A. ClocchiattiDepartamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, ChileAlison L. CoilDepartment of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411A. V. FilippenkoDepartment of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411P. GarnavichDepartment of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556-5670Craig J. HoganDepartment of Astronomy, University of Washington, Box 351580, Seattle, WA 98195-1580K. L. PageDepartment of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556-5670Saurabh W. JhaDepartment of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411R. KirshnerHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138K. KrisciunasCerro Tololo Inter-American Observatory, Casilla 603, La Serena, ChileB. LeibundgutEuropean Southern Observatory, Karl-Schwarzschild-Strasse 2, Garching, D-85748, GermanyWeidong LiDepartment of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411T. MathesonHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138M. M. PhillipsLas Campanas Observatory, Casilla 601, La Serena, ChileAdam G. RiessSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218R. A. SchommerCerro Tololo Inter-American Observatory, Casilla 603, La Serena, ChileR. Chris SmithCerro Tololo Inter-American Observatory, Casilla 603, La Serena, ChileJ. SollermanJ. SpyromilioEuropean Southern Observatory, Karl-Schwarzschild-Strasse 2, Garching, D-85748, GermanyC. W. StubbsDepartment of Astronomy, University of Washington, Box 351580, Seattle, WA 98195-1580N. B. SuntzeffCerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile

2003en

ABI

Аннотация

The High-z Supernova Search Team has discovered and observed eight new supernovae in the redshift interval z = 0.3-1.2. These independent observations, analyzed by similar but distinct methods, confirm the results of Riess and Perlmutter and coworkers that supernova luminosity distances imply an accelerating universe. More importantly, they extend the redshift range of consistently observed Type Ia supernovae (SNe Ia) to z ≈ 1, where the signature of cosmological effects has the opposite sign of some plausible systematic effects. Consequently, these measurements not only provide another quantitative confirmation of the importance of dark energy, but also constitute a powerful qualitative test for the cosmological origin of cosmic acceleration. We find a rate for SN Ia of (1.4 ± 0.5) × 10-4 h3 Mpc-3 yr-1 at a mean redshift of 0.5. We present distances and host extinctions for 230 SN Ia. These place the following constraints on cosmological quantities: if the equation of state parameter of the dark energy is w = -1, then H0t0 = 0.96 ± 0.04, and ΩΛ - 1.4ΩM = 0.35 ± 0.14. Including the constraint of a flat universe, we find ΩM = 0.28 ± 0.05, independent of any large-scale structure measurements. Adopting a prior based on the Two Degree Field (2dF) Redshift Survey constraint on ΩM and assuming a flat universe, we find that the equation of state parameter of the dark energy lies in the range -1.48 < w < -0.72 at 95% confidence. If we further assume that w > -1, we obtain w < -0.73 at 95% confidence. These constraints are similar in precision and in value to recent results reported using the WMAP satellite, also in combination with the 2dF Redshift Survey.

Перевод пока недоступен

Идентификаторы

DOI: 10.1086/376865

Цитирования и источники

Цитирований: 4Использованных источников: 0

Показатели — AkademScholar