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Type Ia Supernova Discoveries at<i>z</i>&gt; 1 from the<i>Hubble Space Telescope</i>: Evidence for Past Deceleration and Constraints on Dark Energy Evolution

Adam G. RiessSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218L. StrolgerSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218J. TonryInstitute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822Stefano CasertanoSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218Henry C. FergusonSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218B. MobasherSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218Peter ChallisHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138A. V. FilippenkoDepartment of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411Saurabh W. JhaDepartment of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411Weidong LiDepartment of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411R. ChornockDepartment of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411R. KirshnerHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138B. LeibundgutEuropean Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, GermanyMark DickinsonSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218Mario LivioSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218Mauro GiavaliscoSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218Charles C. SteidelDepartment of Astronomy, 105-24, California Institute of Technology, Pasadena, CA 91125Txitxo BenitezDepartment of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218Z. TsvetanovDepartment of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218
2004en
ABI

Аннотация

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 and 170 previous SNe Ia are provided. A purely kinematic interpretation of the SN Ia sample provides evidence at the > 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 Omega_M ~ 0.3, Omega_Lambda~0.7 (chi^2_dof=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. When combined with external flat-Universe constraints we find w=-1.02 + 0.13 - 0.19 (and $<-0.76 at the 95% confidence level) for an assumed static equation of state of dark energy, P = w\rho c^2. Joint constraints on both the recent equation of state of dark energy, $w_0$, and its time evolution, dw/dz, are a factor of ~8 more precise than its first estimate 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., w_0 = -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.

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DOI
10.1086/383612

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