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The High-Z Supernova Search: Measuring Cosmic Deceleration and Global Cur vature of the Universe Using Type Ia Supernovae | | Brian P. Schmidt
; Nicholas B. Suntzeff
; M. M. Phillips
; Robert A. Schommer
; Alejandro Clocchiatti
; Robert P. Kirshner
; Peter Garnavich
; Peter Challis
; B. Leibundgut
; J. Spyromilio
; Adam G. Riess
; Alexei V. Filippenko
; Mario Hamuy
; R. Chris Smith
; Craig Hogan
; Christopher Stubbs
; Alan Diercks
; David Reiss
; Ron Gilliland
; John Tonry
; Jose Maza
; A. Dressler
; J. Walsh
; R. Ciardullo
; | | Date: |
15 May 1998 | | Journal: | Astrophys.J. 507 (1998) 46-63 | | Subject: | astro-ph | | Abstract: | The High-Z Supernova Search is an international collaboration to discover and monitor type Ia supernovae (SN Ia) at $z > 0.2$ with the aim of measuring cosmic deceleration and global curvature. Our collaboration has pursued a basic understanding of supernovae in the nearby Universe, discovering and observing a large sample of objects, and developing methods to measure accurate distances with SN Ia. This paper describes the extension of this program to $z geq 0.2$, outlining our search techniques and follow-up program. We have devised high-throughput filters which provide accurate two-color restframe $B$ and $V$ light curves of SN Ia, enabling us to produce precise, extinction-corrected luminosity distances in the range $0.25 < z < 0.55$. Sources of systematic error from K-corrections, extinction, selection effects, and evolution are investigated, and their effects estimated. We present photometric and spectral observations of SN 1995K, our program’s first supernova, and use the data to obtain a precise measurement of the luminosity distance to the $z=0.479$ host galaxy. This object, when combined with a nearby sample of SN, yields an estimate for the matter density of the Universe of $Omega_M = -0.2^{+1.0}_{-0.8}$ if $Omega_Lambda = 0$. For a spatially flat universe composed of normal matter and a cosmological constant, we find $Omega_M = 0.4^{+0.5}_{-0.4}$, $Omega_Lambda = 0.6^{+0.4}_{-0.5}$. We demonstrate that with a sample of $sim 30$ objects, we should be able to determine relative luminosity distances over the range $0 < z< 0.5$ with sufficient precision to measure $Omega_M$ with an uncertainty of $pm 0.2$. | | Source: | arXiv, astro-ph/9805200 | | Services: | Forum | Review | PDF | Favorites | |
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