Cosmological results from high-<i>z</i> supernovae

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dc.contributor.authorTonry, JL
dc.contributor.authorSchmidt, BP
dc.contributor.authorBarris, B
dc.contributor.authorCandia, P
dc.contributor.authorChallis, P
dc.contributor.authorClocchiatti, A
dc.contributor.authorCoil, AL
dc.contributor.authorFilippenko, AV
dc.contributor.authorGarnavich, P
dc.contributor.authorHogan, C
dc.contributor.authorHolland, ST
dc.contributor.authorJha, S
dc.contributor.authorKirshner, RP
dc.contributor.authorKrisciunas, K
dc.contributor.authorLeibundgut, B
dc.contributor.authorLi, WD
dc.contributor.authorMatheson, T
dc.contributor.authorPhillips, MM
dc.contributor.authorRiess, AG
dc.contributor.authorSchommer, R
dc.contributor.authorSmith, RC
dc.contributor.authorSollerman, J
dc.contributor.authorSpyromilio, J
dc.contributor.authorStubbs, CW
dc.contributor.authorSuntzeff, NB
dc.date.accessioned2025-01-21T01:09:04Z
dc.date.available2025-01-21T01:09:04Z
dc.date.issued2003
dc.description.abstractThe 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 (SNeIa) to z approximate to 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) x 10(-4) h(3) 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 H(0)t(0) = 0.96 +/- 0.04, and Omega(Lambda) - 1.4Omega(M) = 0.35 +/- 0/14. Including the constraint of a. at universe, we find Omega(M) = 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 Omega(M) and assuming a. at 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.
dc.fuente.origenWOS
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/96543
dc.identifier.wosidWOS:000185087400001
dc.issue.numero1
dc.language.isoen
dc.pagina.final24
dc.pagina.inicio1
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectcosmological parameters
dc.subjectcosmology : observations
dc.subjectdistance scale
dc.subjectgalaxies : distances and redshifts
dc.subjectsupernovae : general
dc.titleCosmological results from high-<i>z</i> supernovae
dc.typeartículo
dc.volumen594
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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