Cosmological Results from High-z Supernovae

By HIGH-z Supernovae, J. Tonry, B. Schmidt, B. Barris, P. Candia, P. Challis, A. Clocchiatti, A. Coil, A. Filippenko, P. Garnavich and 16 more. 2003

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The High-z Supernova Search Team has discovered and observed eight new supernovae in the redshift interval z = 0.3-1.2. These independent observations, analyzed by similar but distinct methods, confirm the results of Riess and Perlmutter and coworkers that supernova luminosity distances imply an accelerating universe. More importantly, they extend the redshift range of consistently observed Type Ia supernovae (SNe Ia) to z ≈ 1, where the signature of cosmological effects has the opposite sign of some plausible systematic effects. Consequently, these measurements not only provide another quantitative confirmation of the importance of dark energy, but also constitute a powerful qualitative test for the cosmological origin of cosmic acceleration. We find a rate for SN Ia of (1.4 ± 0.5) × 10-4 h3 Mpc-3 yr-1 at a mean redshift of 0.5. We present distances and host extinctions for 230 SN Ia. These place the following constraints on cosmological quantities: if the equation of state parameter of the dark energy is w = -1, then H0t0 = 0.96 ± 0.04, and ΩΛ - 1.4ΩM = 0.35 ± 0.14. Including the constraint of a flat universe, we find ΩM = 0.28 ± 0.05, independent of any large-scale structure measurements. Adopting a prior based on the Two Degree Field (2dF) Redshift Survey constraint on ΩM and assuming a flat universe, we find that the equation of state parameter of the dark energy lies in the range -1.48 < w < -0.72 at 95% confidence. If we further assume that w > -1, we obtain w < -0.73 at 95% confidence. These constraints are similar in precision and in value to recent results reported using the WMAP satellite, also in combination with the 2dF Redshift Survey.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/d17aa0dec3b5cd1a9268d56ec09893f3d10c15e8

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Citations in the corpus

Twenty-Three High-Redshift Supernovae from the Institute for Astronomy Deep Survey: Doubling the Supernova Sample at z > 0.7 (2004, methodology): “Landolt standards (Landolt 1992) and spectrophotometric standards, which have Landolt magnitudes and synthetic Z magnitudes, were observed in BVRIZ (Johnson BV, Cousins RI, and Z as described in Tonry et al. 2003) to set the magnitude scale of the survey target fields.”
Nearby supernova rates from the Lick Observatory Supernova Search – I. The methods and data base (2010, background): “…systems of SNe Ia, numerous recent studies have derived SN Ia rates at moderate to high redshifts (e.g., Hardin et al. 2000; Madgwick et al. 2003; Tonry et al. 2003; Blanc et al. 2004; Strolger et al. 2004; Dahlen et al. 2004, 2008; Neill et al. 2006; Poznanski et al. 2007; Botticella et al.…”
Nearby Supernova Factory Observations of SN 2005gj: Another Type Ia Supernova in a Massive Circumstellar Envelope (2006, background): “They continue to play a major role in ongoing efforts to determine the cause of this acceleration (Knop et al. 2003; Tonry et al. 2003; Riess et al. 2004; Astier et al. 2006) and in refining the determination of the Hubble constant (Riess et al. 2005).”
Hubble Space Telescope and Ground-based Observations of Type Ia Supernovae at Redshift 0.5: Cosmological Implications (2005, methodology): “As in Tonry et al. (2003), we write the apparent brightness of an SN observed in filter o, mo(t), having a z ¼ 0 absolute magnitude light curve in filter r, Mr [t 0 )], as mo tð Þ ¼ Mr 1þ zð Þt 0½ þ 25þ 5 log dlum Mpc þ Kro 1þ zð Þt 0½ ; ð2Þ where Kro is given by Kro ¼ 2:5 log (1þ z) R Fk(k)Sr(k)…”
Probing Dark Energy with Baryonic Acoustic Oscillations from Future Large Galaxy Redshift Surveys (2003, methodology): “It is worth comparing the measurements from future redshift surveys to those inferred from the observations of type Ia supernovae (hereafter SNe) (Riess et al. 1998; Perlmutter et al. 1999; Riess et al. 2001; Tonry et al. 2003).”
Crossing the w = - 1 barrier in the D3-brane dark energy model (2005, background): “1[3, 4] and a possibility that w is varied in time is not excluded.”
Cosmological parameter constraints from SDSS luminous red galaxies: a new treatment of large-scale clustering (2009, background): “…the Equation of State SupErNovae trace Cosmic Expansion (ESSENCE; Miknaitis et al. 2007), the high-redshift sample from the Hubble Space Telescope (Riess et al. 2004; Riess et al. 2007) as well as older data sets (Riess et al. 1998; Perlmutter et al. 1999; Tonry et al. 2003; Barris et al. 2004).”