Type Ia supernova discoveries at z > 1 from the Hubble Space Telescope: Evidence for past deceleration and constraints on dark energy evolution
Adam G. Riess,Louis-Gregory Strolger,John L. Tonry,Stefano Casertano,Henry C. Ferguson,Bahram Mobasher,Peter Challis,Alexei V. Filippenko,Saurabh Jha,Weidong Li,Ryan Chornock,Robert P. Kirshner,Bruno Leibundgut,Mark Dickinson,Mario Livio,Mauro Giavalisco,Charles C. Steidel,Txitxo Benítez,Zlatan Tsvetanov +18 more
TLDR
For a flat universe with a cosmological constant, the transition between the two epochs is constrained to be at z = 0.46 ± 0.13 as mentioned in this paper, and w = -1.02 ± (and w < -0.76 at the 95% confidence level) for an assumed static equation of state of dark energy.Abstract:
We have discovered 16 Type Ia supernovae (SNe Ia) with the Hubble Space Telescope (HST) and have used them to provide the first conclusive evidence for cosmic deceleration that preceded the current epoch of cosmic acceleration. These objects, discovered during the course of the GOODS ACS Treasury program, include 6 of the 7 highest redshift SNe Ia known, all at z > 1.25, and populate the Hubble diagram in unexplored territory. The luminosity distances to these objects and to 170 previously reported SNe Ia have been determined using empirical relations between light-curve shape and luminosity. A purely kinematic interpretation of the SN Ia sample provides evidence at the greater than 99% confidence level for a transition from deceleration to acceleration or, similarly, strong evidence for a cosmic jerk. Using a simple model of the expansion history, the transition between the two epochs is constrained to be at z = 0.46 ± 0.13. The data are consistent with the cosmic concordance model of ΩM ≈ 0.3, ΩΛ ≈ 0.7 (χ = 1.06) and are inconsistent with a simple model of evolution or dust as an alternative to dark energy. For a flat universe with a cosmological constant, we measure ΩM = 0.29 ± (equivalently, ΩΛ = 0.71). When combined with external flat-universe constraints, including the cosmic microwave background and large-scale structure, we find w = -1.02 ± (and w < -0.76 at the 95% confidence level) for an assumed static equation of state of dark energy, P = wρc2. Joint constraints on both the recent equation of state of dark energy, w0, and its time evolution, dw/dz, are a factor of ~8 more precise than the first estimates and twice as precise as those without the SNe Ia discovered with HST. Our constraints are consistent with the static nature of and value of w expected for a cosmological constant (i.e., w0 = -1.0, dw/dz = 0) and are inconsistent with very rapid evolution of dark energy. We address consequences of evolving dark energy for the fate of the universe.read more
Citations
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Reconstruction of the deceleration parameter and the equation of state of dark energy
Yungui Gong,Anzhong Wang +1 more
TL;DR: In this article, the authors combined the 182 gold supernova Ia data, the baryon acoustic oscillation measurement and the shift parameter determined from the Sloan Digital Sky Survey, and the three-year Wilkinson Microwave Anisotropy Probe data to reconstruct the dark energy equation of state parameter $w(z)$ and the deceleration parameter $q(z), and they found that the strongest evidence of acceleration happens around the redshift $z\ensuremath{\sim}0.2--0.5$.
Journal ArticleDOI
Effective equation of state for dark energy: Mimicking quintessence and phantom energy through a variable Λ
TL;DR: In this article, it was shown that the effective EOS associated to a renormalization group (RG) model can correspond to both normal quintessence and phantom dark energy, depending on the value of a single parameter of the RG model.
Journal ArticleDOI
Dust and Extinction Curves in Galaxies with z>0: The Interstellar Medium of Gravitational Lens Galaxies
Emilio E. Falco,Chris Impey,Christopher S. Kochanek,Joseph Lehar,Brian McLeod,Hans-Walter Rix,Charles R. Keeton,J. A. Muñoz,Chien Y. Peng +8 more
TL;DR: In this paper, the authors determined 37 differential extinctions in 23 galaxies over the range 0 < z − l < 1, and only 7 of the 23 systems have spectral differences consistent with no differential extinction.
Journal ArticleDOI
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological implications of the large-scale two-point correlation function
Ariel G. Sánchez,Claudia G. Scóccola,Claudia G. Scóccola,Ashley J. Ross,Will J. Percival,Marc Manera,Francesco Montesano,X. Mazzalay,Antonio J. Cuesta,Daniel J. Eisenstein,Eyal A. Kazin,Cameron K. McBride,Kushal T. Mehta,Antonio D. Montero-Dorta,Nikhil Padmanabhan,Francisco Prada,Francisco Prada,Jose Alberto Rubino-Martin,Jose Alberto Rubino-Martin,Rita Tojeiro,Xiaoying Xu,M. Vargas Magaña,Éric Aubourg,Neta A. Bahcall,Stephen Bailey,Dmitry Bizyaev,Adam S. Bolton,Howard Brewington,Jon Brinkmann,Joel R. Brownstein,J. Richard Gott,Jean-Christophe Hamilton,Shirley Ho,Shirley Ho,K. Honscheid,A. Labatie,Elena Malanushenko,V. Malanushenko,Claudia Maraston,Demitri Muna,Robert C. Nichol,Daniel Oravetz,Kaike Pan,Nicholas P. Ross,Natalie A. Roe,Beth Reid,David J. Schlegel,A. Shelden,Donald P. Schneider,Audrey Simmons,Ramin A. Skibba,Stephanie A. Snedden,Daniel Thomas,Jeremy L. Tinker,David A. Wake,Benjamin A. Weaver,David H. Weinberg,Martin White,Martin White,Idit Zehavi,Gong-Bo Zhao,Gong-Bo Zhao +61 more
TL;DR: In this paper, the authors obtained constraints on cosmological parameters from the spherically averaged redshift-space correlation function of the CMASS Data Release 9 (DR9) sample of the Baryonic Oscillation Spectroscopic Survey (BOSS), and combined this information with additional data from recent cosmic microwave background (CMB), supernova and baryon acoustic oscillation measurements.
Journal ArticleDOI
The golden standard type ia supernova 2005cf: Observations from the ultraviolet to the near-infrared wavebands
Xiaofeng Wang,Xiaofeng Wang,Weidong Li,Alexei V. Filippenko,Ryan J. Foley,Ryan J. Foley,Robert P. Kirshner,Maryam Modjaz,Maryam Modjaz,Josh Bloom,Peter J. Brown,Dave Carter,Andrew S. Friedman,Avishay Gal-Yam,Mohan Ganeshalingam,Malcolm Hicken,Kevin Krisciunas,Peter Milne,J. M. Silverman,Nicholas B. Suntzeff,W. M. Wood-Vasey,W. M. Wood-Vasey,S. B. Cenko,S. B. Cenko,P. Challis,D. B. Fox,David Kirkman,J. Li,Ti-Pei Li,M. A. Malkan,Matthew R. Moore,David Reitzel,R. M. Rich,F. J. D. Serduke,R. C. Shang,Thea N. Steele,Brandon J. Swift,Charling Tao,Diane Sonya Wong,Shuang-Nan Zhang +39 more
TL;DR: In this article, the authors present extensive photometry at ultraviolet, optical, and near-infrared (NIR) wavelengths, as well as dense sampling of optical spectra, for the normal Type Ia supernova (SN Ia) 2005cf.
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Measurements of Omega and Lambda from 42 High-Redshift Supernovae
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Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
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Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
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TL;DR: In this paper, the authors present observations of 10 type Ia supernovae (SNe Ia) between 0.16 0 and 4.0 sigma confidence levels, for two fitting methods respectively.
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