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Dive into the research topics where P. S. Bunclark is active.

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Featured researches published by P. S. Bunclark.


The Astrophysical Journal | 1997

Measurements of the Cosmological Parameters

S. Perlmutter; Silvia Gabi; G. Goldhaber; A. Goobar; D. E. Groom; I. M. Hook; A. G. Kim; M. Y. Kim; J. C. Lee; R. Pain; Carlton R. Pennypacker; I. A. Small; Richard S. Ellis; Richard G. McMahon; B. J. Boyle; P. S. Bunclark; D. L. Carter; M. J. Irwin; Karl Glazebrook; H. Newberg; A. V. Filippenko; Thomas Matheson; Michael A. Dopita; Warrick J. Couch

We have developed a technique to systematically discover and study high-redshift supernovae that can be used to measure the cosmological parameters. We report here results based on the initial seven of more than 28 supernovae discovered to date in the high-redshift supernova search of the Supernova Cosmology Project. We find an observational dispersion in peak magnitudes of ? -->MB=0.27; this dispersion narrows to ?MB, corr=0.19 after correcting the magnitudes using the light-curve width-luminosity relation found for nearby (z ? 0.1) Type Ia supernovae from the Cal?n/Tololo survey (Hamuy et al.). Comparing light-curve width-corrected magnitudes as a function of redshift of our distant (z = 0.35-0.46) supernovae to those of nearby Type Ia supernovae yields a global measurement of the mass density, ?M


Archive | 1997

\Omega

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

{r M}


Proceedings of SPIE | 2004

and

M. J. Irwin; J. Lewis; Simon T. Hodgkin; P. S. Bunclark; D. W. Evans; Richard McMahon; James P. Emerson; Malcolm Stewart; Steven M. Beard

-->=0.88 -->+ 0.69?0.60 for a ? = 0 cosmology. For a spatially flat universe (i.e., ?M + ?? = 1), we find ?M


The Astrophysical Journal | 1996

\Lambda

R. Pain; I. M. Hook; S. Perlmutter; S. Deustua; S. Gabi; G. Goldhaber; D. Groom; A. Kim; Myung-Hee Yoon Kim; Julia C. Lee; C. R. Pennypacker; I. Small; Ariel Goobar; Richard S. Ellis; Richard McMahon; Karl Glazebrook; B. J. Boyle; P. S. Bunclark; D. L. Carter; M. J. Irwin

{r M}


New Astronomy Reviews | 2001

from the First 7 Supernovae at z >= 0.35

Richard G. McMahon; N.A Walton; M. J. Irwin; J. Lewis; P. S. Bunclark; D.H Jones

-->=0.94 -->+ 0.34?0.28 or, equivalently, a measurement of the cosmological constant, ??=0.06 -->+ 0.28?0.34 ( < 0.51 at the 95% confidence level). For the more general Friedmann-Lema?tre cosmologies with independent ?M and ??, the results are presented as a confidence region on the ?M-?? plane. This region does not correspond to a unique value of the deceleration parameter q0. We present analyses and checks for statistical and systematic errors and also show that our results do not depend on the specifics of the width-luminosity correction. The results for ??-versus-?M are inconsistent with ?-dominated, low-density, flat cosmologies that have been proposed to reconcile the ages of globular cluster stars with higher Hubble constant values.


The Astrophysical Journal | 1995

Measurements of the cosmological parameters omega and lambda from the first seven supernovae at z greater than or equal to 0.35

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

We have developed a technique to systematically discover and study high-redshift supernovae that can be used to measure the cosmological parameters. We report here results based on the initial seven of more than 28 supernovae discovered to date in the high-redshift supernova search of the Supernova Cosmology Project. We find an observational dispersion in peak magnitudes of ? -->MB=0.27; this dispersion narrows to ?MB, corr=0.19 after correcting the magnitudes using the light-curve width-luminosity relation found for nearby (z ? 0.1) Type Ia supernovae from the Cal?n/Tololo survey (Hamuy et al.). Comparing light-curve width-corrected magnitudes as a function of redshift of our distant (z = 0.35-0.46) supernovae to those of nearby Type Ia supernovae yields a global measurement of the mass density, ?M


Proceedings of SPIE | 2004

VISTA data flow system: pipeline processing for WFCAM and VISTA

James P. Emerson; M. J. Irwin; J. Lewis; Simon T. Hodgkin; D. W. Evans; P. S. Bunclark; Richard McMahon; Nigel Hambly; Robert G. Mann; I. A. Bond; Eckhard Sutorius; Mike Read; P. M. Williams; A. Lawrence; Malcolm Stewart

{r M}


Astronomy and Astrophysics | 2017

The Type Ia Supernova Rate at z ~ 0.4

F. van Leeuwen; D. W. Evans; F. De Angeli; C. Jordi; G. Busso; Carla Cacciari; M. Riello; E. Pancino; Giuseppe Altavilla; A. G. A. Brown; P. Burgess; J. M. Carrasco; G. Cocozza; S. Cowell; M. Davidson; F. De Luise; C. Fabricius; S. Galleti; G. Gilmore; G. Giuffrida; Nigel Hambly; D. Harrison; Simon T. Hodgkin; G. Holland; I. Macdonald; S. Marinoni; P. Montegriffo; P. Osborne; S. Ragaini; P. J. Richards

-->=0.88 -->+ 0.69?0.60 for a ? = 0 cosmology. For a spatially flat universe (i.e., ?M + ?? = 1), we find ?M


arXiv: Astrophysics | 1997

The INT wide field imaging survey (WFS)

S. Perlmutter; S. Deustua; S. Gabi; G. Goldhaber; D. Groom; I. M. Hook; A. Kim; Myung-Hee Yoon Kim; Julia C. Lee; R. Pain; C. R. Pennypacker; I. Small; Ariel Goobar; Richard S. Ellis; Richard McMahon; B. J. Boyle; P. S. Bunclark; D. Carter; Karl Glazebrook; M. J. Irwin; Heidi Jo Newberg; Alexei V. Filippenko; T. Matheson; Michael A. Dopita; Jeremy R. Mould; Warrick J. Couch

{r M}


The Astrophysical Journal | 1997

A Supernova at z = 0.458 and Implications for Measuring the Cosmological Deceleration

A. G. Kim; S. Gabi; G. Goldhaber; Donald E. Groom; I. M. Hook; M. Y. Kim; J. 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

-->=0.94 -->+ 0.34?0.28 or, equivalently, a measurement of the cosmological constant, ??=0.06 -->+ 0.28?0.34 ( < 0.51 at the 95% confidence level). For the more general Friedmann-Lema?tre cosmologies with independent ?M and ??, the results are presented as a confidence region on the ?M-?? plane. This region does not correspond to a unique value of the deceleration parameter q0. We present analyses and checks for statistical and systematic errors and also show that our results do not depend on the specifics of the width-luminosity correction. The results for ??-versus-?M are inconsistent with ?-dominated, low-density, flat cosmologies that have been proposed to reconcile the ages of globular cluster stars with higher Hubble constant values.

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M. J. Irwin

University of Cambridge

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B. J. Boyle

Australia Telescope National Facility

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G. Goldhaber

University of California

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S. Perlmutter

Lawrence Berkeley National Laboratory

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D. L. Carter

Space Sciences Laboratory

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I. A. Small

Space Sciences Laboratory

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Alex G. Kim

Lawrence Berkeley National Laboratory

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Silvia Gabi

Lawrence Berkeley National Laboratory

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