The Acceleration of the Universe:. Measurements of Cosmological Parameters from Type Ia Supernovae

A. Goobar; S. Perlmutter; G. Aldering; G. Goldhaber; R. A. Knop; P. Nugent; P. G. Castro; S. Deustua; S. Fabbro; D. E. Groom; I. M. Hook; A. G. Kim; M. Y. Kim; J. C. Lee; N. J. Nunes; R. Pain; C. R. Pennypacker; R. Quimby; C. Lidman; R. S. Ellis; M. Irwin; R. G. McMahon; P. Ruiz-Lapuente; N. Walton; B. Schaefer; B. J. Boyle; A. V. Filippenko; T. Matheson; A. S. Fruchter; N. Panagia; H. J. M. Newberg; W. J. Couch

doi:10.1142/9789812810434_0005

The Acceleration of the Universe:. Measurements of Cosmological Parameters from Type Ia Supernovae

A. Goobar, S. Perlmutter, G. Aldering, G. Goldhaber, R. A. Knop, P. Nugent, P. G. Castro, S. Deustua, S. Fabbro, D. E. Groom, I. M. Hook, A. G. Kim, M. Y. Kim, J. C. Lee, N. J. Nunes, R. Pain, C. R. Pennypacker, R. Quimby, C. Lidman, R. S. EllisM. Irwin, R. G. McMahon, P. Ruiz-Lapuente, N. Walton, B. Schaefer, B. J. Boyle, A. V. Filippenko, T. Matheson, A. S. Fruchter, N. Panagia, H. J. M. Newberg, W. J. Couch

Research School of Astronomy & Astrophysics

Research output: Contribution to conference › Paper

Abstract

The fate of the Universe, infinite expansion or a "big crunch", can be determined by measuring the redshifts and brightness of very distant supernovae. These provide a record of changes in the expansion rate of the Universe over the past several billion years. The mass density, Ω_M, and cosmological-constant energy density, Ω_Λ, are measured from a data-set consisting of 42 high-redshift Type Ia supernovae discovered by the Supernova Cosmology Project. The magnitude-redshift data for these supernovae, at redshifts between 0.18 and 0.83, are fit jointly with a set of supernovae from the Calán/Tololo Supernova Survey, at redshifts below 0.1, to yield values for the cosmological parameters. We find Ω _M flat = 0.28_-0.08^+0.09 (1σ \ statistical)_-0.04^+0.05 (identified systematics). The data are strongly inconsistent with a Λ = 0 flat cosmology, the simplest inflationary universe model. An open, Λ = 0 cosmology also does not fit the data well: the data indicate that the cosmological constant is non-zero and positive, with a confidence of P(Λ > 0) = 99%, including the identified systematic uncertainties. Thus, the Universe is found to be accelerating, i.e., q₀ = Ω_M/2 - Ω_Λ < 0. The best-fit age of the universe relative to the Hubble time is t₀ flat = 14.9_-1.1^+1.4 (0.63/h)\ Gyr for a flat cosmology.

Original language	English
Pages	47-58
Number of pages	12
DOIs	https://doi.org/10.1142/9789812810434_0005
Publication status	Published - 1 Mar 2001

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https://ui.adsabs.harvard.edu/abs/2001ppu..conf...47G

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Goobar, A., Perlmutter, S., Aldering, G., Goldhaber, G., Knop, R. A., Nugent, P., Castro, P. G., Deustua, S., Fabbro, S., Groom, D. E., Hook, I. M., Kim, A. G., Kim, M. Y., Lee, J. C., Nunes, N. J., Pain, R., Pennypacker, C. R., Quimby, R., Lidman, C., ... Couch, W. J. (2001). The Acceleration of the Universe:. Measurements of Cosmological Parameters from Type Ia Supernovae. 47-58. https://doi.org/10.1142/9789812810434_0005

@conference{7ac9e798a79e4951aa52dd282fde7e2c,

title = "The Acceleration of the Universe:. Measurements of Cosmological Parameters from Type Ia Supernovae",

abstract = "The fate of the Universe, infinite expansion or a {"}big crunch{"}, can be determined by measuring the redshifts and brightness of very distant supernovae. These provide a record of changes in the expansion rate of the Universe over the past several billion years. The mass density, ΩM, and cosmological-constant energy density, ΩΛ, are measured from a data-set consisting of 42 high-redshift Type Ia supernovae discovered by the Supernova Cosmology Project. The magnitude-redshift data for these supernovae, at redshifts between 0.18 and 0.83, are fit jointly with a set of supernovae from the Cal{\'a}n/Tololo Supernova Survey, at redshifts below 0.1, to yield values for the cosmological parameters. We find Ω M flat = 0.28-0.08+0.09 (1σ \ statistical)-0.04+0.05 (identified systematics). The data are strongly inconsistent with a Λ = 0 flat cosmology, the simplest inflationary universe model. An open, Λ = 0 cosmology also does not fit the data well: the data indicate that the cosmological constant is non-zero and positive, with a confidence of P(Λ > 0) = 99%, including the identified systematic uncertainties. Thus, the Universe is found to be accelerating, i.e., q0 = ΩM/2 - ΩΛ < 0. The best-fit age of the universe relative to the Hubble time is t0 flat = 14.9-1.1+1.4 (0.63/h)\ Gyr for a flat cosmology.",

keywords = "98.80.-k, Cosmology",

author = "A. Goobar and S. Perlmutter and G. Aldering and G. Goldhaber and Knop, {R. A.} and P. Nugent and Castro, {P. G.} and S. Deustua and S. Fabbro and Groom, {D. E.} and Hook, {I. M.} and Kim, {A. G.} and Kim, {M. Y.} and Lee, {J. C.} and Nunes, {N. J.} and R. Pain and Pennypacker, {C. R.} and R. Quimby and C. Lidman and Ellis, {R. S.} and M. Irwin and McMahon, {R. G.} and P. Ruiz-Lapuente and N. Walton and B. Schaefer and Boyle, {B. J.} and Filippenko, {A. V.} and T. Matheson and Fruchter, {A. S.} and N. Panagia and Newberg, {H. J. M.} and Couch, {W. J.}",

year = "2001",

month = mar,

day = "1",

doi = "10.1142/9789812810434_0005",

language = "English",

pages = "47--58",

}

Goobar, A, Perlmutter, S, Aldering, G, Goldhaber, G, Knop, RA, Nugent, P, Castro, PG, Deustua, S, Fabbro, S, Groom, DE, Hook, IM, Kim, AG, Kim, MY, Lee, JC, Nunes, NJ, Pain, R, Pennypacker, CR, Quimby, R, Lidman, C, Ellis, RS, Irwin, M, McMahon, RG, Ruiz-Lapuente, P, Walton, N, Schaefer, B, Boyle, BJ, Filippenko, AV, Matheson, T, Fruchter, AS, Panagia, N, Newberg, HJM & Couch, WJ 2001, 'The Acceleration of the Universe:. Measurements of Cosmological Parameters from Type Ia Supernovae', pp. 47-58. https://doi.org/10.1142/9789812810434_0005

TY - CONF

T1 - The Acceleration of the Universe:. Measurements of Cosmological Parameters from Type Ia Supernovae

AU - Goobar, A.

AU - Perlmutter, S.

AU - Aldering, G.

AU - Goldhaber, G.

AU - Knop, R. A.

AU - Nugent, P.

AU - Castro, P. G.

AU - Deustua, S.

AU - Fabbro, S.

AU - Groom, D. E.

AU - Hook, I. M.

AU - Kim, A. G.

AU - Kim, M. Y.

AU - Lee, J. C.

AU - Nunes, N. J.

AU - Pain, R.

AU - Pennypacker, C. R.

AU - Quimby, R.

AU - Lidman, C.

AU - Ellis, R. S.

AU - Irwin, M.

AU - McMahon, R. G.

AU - Ruiz-Lapuente, P.

AU - Walton, N.

AU - Schaefer, B.

AU - Boyle, B. J.

AU - Filippenko, A. V.

AU - Matheson, T.

AU - Fruchter, A. S.

AU - Panagia, N.

AU - Newberg, H. J. M.

AU - Couch, W. J.

PY - 2001/3/1

Y1 - 2001/3/1

N2 - The fate of the Universe, infinite expansion or a "big crunch", can be determined by measuring the redshifts and brightness of very distant supernovae. These provide a record of changes in the expansion rate of the Universe over the past several billion years. The mass density, ΩM, and cosmological-constant energy density, ΩΛ, are measured from a data-set consisting of 42 high-redshift Type Ia supernovae discovered by the Supernova Cosmology Project. The magnitude-redshift data for these supernovae, at redshifts between 0.18 and 0.83, are fit jointly with a set of supernovae from the Calán/Tololo Supernova Survey, at redshifts below 0.1, to yield values for the cosmological parameters. We find Ω M flat = 0.28-0.08+0.09 (1σ \ statistical)-0.04+0.05 (identified systematics). The data are strongly inconsistent with a Λ = 0 flat cosmology, the simplest inflationary universe model. An open, Λ = 0 cosmology also does not fit the data well: the data indicate that the cosmological constant is non-zero and positive, with a confidence of P(Λ > 0) = 99%, including the identified systematic uncertainties. Thus, the Universe is found to be accelerating, i.e., q0 = ΩM/2 - ΩΛ < 0. The best-fit age of the universe relative to the Hubble time is t0 flat = 14.9-1.1+1.4 (0.63/h)\ Gyr for a flat cosmology.

AB - The fate of the Universe, infinite expansion or a "big crunch", can be determined by measuring the redshifts and brightness of very distant supernovae. These provide a record of changes in the expansion rate of the Universe over the past several billion years. The mass density, ΩM, and cosmological-constant energy density, ΩΛ, are measured from a data-set consisting of 42 high-redshift Type Ia supernovae discovered by the Supernova Cosmology Project. The magnitude-redshift data for these supernovae, at redshifts between 0.18 and 0.83, are fit jointly with a set of supernovae from the Calán/Tololo Supernova Survey, at redshifts below 0.1, to yield values for the cosmological parameters. We find Ω M flat = 0.28-0.08+0.09 (1σ \ statistical)-0.04+0.05 (identified systematics). The data are strongly inconsistent with a Λ = 0 flat cosmology, the simplest inflationary universe model. An open, Λ = 0 cosmology also does not fit the data well: the data indicate that the cosmological constant is non-zero and positive, with a confidence of P(Λ > 0) = 99%, including the identified systematic uncertainties. Thus, the Universe is found to be accelerating, i.e., q0 = ΩM/2 - ΩΛ < 0. The best-fit age of the universe relative to the Hubble time is t0 flat = 14.9-1.1+1.4 (0.63/h)\ Gyr for a flat cosmology.

KW - 98.80.-k

KW - Cosmology

U2 - 10.1142/9789812810434_0005

DO - 10.1142/9789812810434_0005

M3 - Paper

SP - 47

EP - 58

ER -

The Acceleration of the Universe:. Measurements of Cosmological Parameters from Type Ia Supernovae

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