Ariel Goobar
Lawrence Berkeley National Laboratory
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Publication
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The Astrophysical Journal | 1999
S. Perlmutter; G. Aldering; G. Goldhaber; Robert Andrew Knop; Peter E. Nugent; P. G. Castro; S. E. Deustua; S. Fabbro; Ariel Goobar; Donald E. Groom; I. M. Hook; A. G. Kim; M. Y. Kim; Julia C. Lee; N. J. Nunes; R. Pain; Carlton R. Pennypacker; Robert Michael Quimby; C. Lidman; Richard S. Ellis; M. J. Irwin; Richard G. McMahon; Pilar Ruiz-Lapuente; Nancy A. Walton; Bradley E. Schaefer; B. J. Boyle; A. V. Filippenko; Thomas Matheson; Andrew S. Fruchter; Nino Panagia
We report measurements of the mass density, Omega_M, and cosmological-constant energy density, Omega_Lambda, of the universe based on the analysis of 42 Type Ia supernovae discovered by the Supernova Cosmology Project. The magnitude-redshift data for these SNe, at redshifts between 0.18 and 0.83, are fit jointly with a set of SNe from the Calan/Tololo Supernova Survey, at redshifts below 0.1, to yield values for the cosmological parameters. All SN peak magnitudes are standardized using a SN Ia lightcurve width-luminosity relation. The measurement yields a joint probability distribution of the cosmological parameters that is approximated by the relation 0.8 Omega_M - 0.6 Omega_Lambda ~= -0.2 +/- 0.1 in the region of interest (Omega_M 0) = 99%, including the identified systematic uncertainties. The best-fit age of the universe relative to the Hubble time is t_0 = 14.9{+1.4,-1.1} (0.63/h) Gyr for a flat cosmology. The size of our sample allows us to perform a variety of statistical tests to check for possible systematic errors and biases. We find no significant differences in either the host reddening distribution or Malmquist bias between the low-redshift Calan/Tololo sample and our high-redshift sample. The conclusions are robust whether or not a width-luminosity relation is used to standardize the SN peak magnitudes.
The Astrophysical Journal | 2003
Robert Andrew Knop; Isobel M. Hook; C. Lidman; Bradley E. Schaefer; A. Conley; B.C. Lee; Andrew S. Fruchter; Ariel Goobar; Nino Panagia; M. Sullivan; Gaston Folatelli; S. Nobili; G. Goldhaber; V. Stanishev; Sebastien Fabbro; William Michael Wood-Vasey; G. Sainton; Guillaume Blanc; Eric P. Smith; J. Raux; Nancy A. Walton; G. Garavini; A. G. Kim; Rachel Annette Gibbons; Mamoru Doi; Juan E. Mendez; P. Astier; Carlton R. Pennypacker; K. Garton; G. Aldering
We report measurements of
Archive | 1997
Saul Perlmutter; Silvia Gabi; G. Goldhaber; Ariel Goobar; Donald E. Groom; Isobel M. Hook; Alex G. Kim; Min Kook Kim; Janice C. Lee; R. Pain; Carlton R. Pennypacker; I. A. Small; Richard S. Ellis; Richard G. McMahon; B. J. Boyle; P. S. Bunclark; David Carter; M. J. Irwin; Karl Glazebrook; Heidi Jo Newberg; Alexei V. Filippenko; Thomas Matheson; Michael A. Dopita; Warrick J. Couch
Omega_M
Nature | 2015
Yi Cao; S. R. Kulkarni; D. Andrew Howell; Avishay Gal-Yam; Mansi M. Kasliwal; S. Valenti; Joel Johansson; Rahman Amanullah; Ariel Goobar; Jesper Sollerman; F. Taddia; Assaf Horesh; Ilan Sagiv; S. Bradley Cenko; Peter E. Nugent; Iair Arcavi; Jason A. Surace; P. R. Woźniak; Daniela I. Moody; Umaa Rebbapragada; Brian D. Bue; Neil Gehrels
,
The Astrophysical Journal | 1995
S. Perlmutter; M. Y. Kim; C. S. Crawford; R.S. Ellis; A.G. Kim; B. J. Boyle; Ariel Goobar; H.J.M. Newberg; I. A. Small; G. Goldhaber; W.J. Couch; K. Glazebrook; Richard A. Muller; Jeremy R. Mould; Carl R. Pennypacker; T.A. Small; Jaydev P. Desai; Richard G. McMahon; R.G. Abraham; P. S. Bunclark; M. J. Irwin; R.J. Terlevich; D. L. Carter
Omega_Lambda
Nature | 1998
S. Perlmutter; G. Aldering; M. Della Valle; Susana Elizabeth Deustua; Richard S. Ellis; Sebastien Fabbro; Andrew S. Fruchter; G. Goldhaber; Ariel Goobar; Donald E. Groom; I. M. Hook; A. G. Kim; M. Y. Kim; Robert Andrew Knop; C. Lidman; Richard G. McMahon; Peter Edward Nugent; R. Pain; N. Panagia; Carlton R. Pennypacker; P. Ruiz-Lapuente; Bradley E. Schaefer; Nancy A. Walton
, and w from eleven supernovae at z=0.36-0.86 with high-quality lightcurves measured using WFPC-2 on the HST. This is an independent set of high-redshift supernovae that confirms previous supernova evidence for an accelerating Universe. Combined with earlier Supernova Cosmology Project data, the new supernovae yield a flat-universe measurement of the mass density
The Astrophysical Journal | 1997
A. G. Kim; Silvia Gabi; G. Goldhaber; Donald E. Groom; I. M. Hook; M. Y. Kim; Julia C. Lee; Carlton R. Pennypacker; S. Perlmutter; I. A. Small; Ariel Goobar; R. Pain; Richard S. Ellis; Richard G. McMahon; B. J. Boyle; P. S. Bunclark; D. L. Carter; M. J. Irwin; Karl Glazebrook; Heidi Jo Newberg; A. V. Filippenko; Thomas Matheson; Michael A. Dopita; Warrick J. Couch
Omega_M=0.25^{+0.07}_{-0.06}
The Astrophysical Journal | 2018
Adam A. Miller; Y. Cao; Anthony L. Piro; N. Blagorodnova; Brian D. Bue; S. B. Cenko; S. Dhawan; Raphael Ferretti; Ori D. Fox; C. Fremling; Ariel Goobar; Dale Andrew Howell; G. Hosseinzadeh; Mansi M. Kasliwal; R. R. Laher; R. Lunnan; Frank J. Masci; Curtis McCully; P. Nugent; Jesper Sollerman; F. Taddia; S. R. Kulkarni
(statistical)
Nature | 2015
Yi Cao; S. R. Kulkarni; D. Andrew Howell; Avishay Gal-Yam; Mansi M. Kasliwal; S. Valenti; Joel Johansson; Rahman Amanullah; Ariel Goobar; Jesper Sollerman; F. Taddia; Assaf Horesh; Ilan Sagiv; S. Bradley Cenko; Peter E. Nugent; Iair Arcavi; Jason A. Surace; P. R. Woźniak; Daniela I. Moody; Umaa Rebbapragada; Brian D. Bue; Neil Gehrels
pm0.04
Neutrino 94, The XVI International Conference on Neutrino Physics and Astrophysics, Eilat, Israel, May 29-June 3, 1994 | 1995
G. Goldhaber; B. J. Boyle; P. S. Bunclark; D. L. Carter; Richard S. Ellis; Silvia Gabi; Ariel Goobar; Alex G. Kim; M. Y. Kim; Richard McMahon; R. Pain; Carl R. Pennypacker; S. Perlmutter; I. A. Small; Roberto Terlevich
(identified systematics), or equivalently, a cosmological constant of
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