New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy

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dc.creatorRiess, Adam G.
dc.creatorStrolger, Louis-Gregory
dc.creatorCasertano, Stefano
dc.creatorFerguson, Henry C.
dc.creatorMobasher, Bahram
dc.creatorGold, Ben
dc.creatorChallis, Peter J.
dc.creatorFilippenko, Alexei V.
dc.creatorJha, Saurabh
dc.creatorLi, Weidong
dc.creatorTonry, John
dc.creatorFoley, Ryan
dc.creatorKirshner, Robert P.
dc.creatorDickinson, Mark
dc.creatorMacDonald, Emily
dc.creatorEisenstein, Daniel
dc.creatorLivio, Mario
dc.creatorYounger, Josh
dc.creatorXu, Chun
dc.creatorDahlen, Tomas
dc.creatorStern, Daniel
dc.date2006-11-17
dc.date2006-12-20
dc.date.accessioned2026-07-07T11:42:40Z
dc.date.available2026-07-07T11:42:40Z
dc.descriptionWe have discovered 21 new Type Ia supernovae (SNe Ia) with the Hubble Space Telescope (HST) and have used them to trace the history of cosmic expansion over the last 10 billion years. These objects, which include 13 spectroscopically confirmed SNe Ia at z > 1, were discovered during 14 epochs of reimaging of the GOODS fields North and South over two years with the Advanced Camera for Surveys on HST. Together with a recalibration of our previous HST-discovered SNe Ia, the full sample of 23 SNe Ia at z > 1 provides the highest-redshift sample known. Combined with previous SN Ia datasets, we measured H(z) at discrete, uncorrelated epochs, reducing the uncertainty of H(z>1) from 50% to under 20%, strengthening the evidence for a cosmic jerk--the transition from deceleration in the past to acceleration in the present. The unique leverage of the HST high-redshift SNe Ia provides the first meaningful constraint on the dark energy equation-of-state parameter at z >1. The result remains consistent with a cosmological constant (w(z)=-1), and rules out rapidly evolving dark energy (dw/dz >>1). The defining property of dark energy, its negative pressure, appears to be present at z>1, in the epoch preceding acceleration, with ~98% confidence in our primary fit. Moreover, the z>1 sample-averaged spectral energy distribution is consistent with that of the typical SN Ia over the last 10 Gyr, indicating that any spectral evolution of the properties of SNe Ia with redshift is still below our detection threshold.
dc.descriptiontypos, references corrected, minor additions to exposition 82 pages, 17 figures, 6 tables. Data also available at: http://braeburn.pha.jhu.edu/~ariess/R06. Accepted, Astrophysical Journal vol. 656 for March 10, 2007
dc.identifierhttps://arxiv.org/abs/astro-ph/0611572
dc.identifierhttp://arxiv.org/abs/astro-ph/0611572
dc.identifierAstrophys.J.659:98-121,2007
dc.identifierdoi:10.1086/510378
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200962
dc.subjectAstrophysics
dc.titleNew Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
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