The High-Z Supernova Search: Measuring cosmic deceleration and global curvature of the universe using Type IA supernovae

被引:1233
作者
Schmidt, BP
Suntzeff, NB
Phillips, MM
Schommer, RA
Clocchiatti, A
Kirshner, RP
Garnavich, P
Challis, P
Leibundgut, B
Spyromilio, J
Riess, AG
Filippenko, AV
Hamuy, M
Smith, RC
Hogan, C
Stubbs, C
Diercks, A
Reiss, D
Gilliland, R
Tonry, J
Maza, J
Dressler, A
Walsh, J
Ciardullo, R
机构
[1] Australian Natl Univ, Mt Stromlo & Siding Spring Observ, Weston, ACT 2611, Australia
[2] Cerro Tololo Interamer Observ, La Serena, Chile
[3] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[4] European So Observ, D-85748 Garching, Germany
[5] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
[6] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
[7] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA
[8] Univ Washington, Dept Astron, Seattle, WA 98195 USA
[9] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[10] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
[11] Univ Chile, Dept Astron, Santiago, Chile
[12] Carnegie Inst Washington Observ, Pasadena, CA 91101 USA
[13] Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA
关键词
cosmology : observations; galaxies : distances and redshifts; supernovae : general; supernovae : individual (SN 1995K);
D O I
10.1086/306308
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The High-Z Supernova Search is an international collaboration to discover and monitor Type Ia supernovae (SNe 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 SNe Ia. This paper describes the extension of this program to z greater than or equal to 0.2, outlining our search techniques and follow-up program. We have devised high-throughput filters that provide accurate two-color rest frame B and V light curves of SNe 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 (SN) 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 SNe, yields an estimate for the matter density of the universe of Omega(M) = -0.2(-0.8)(+1.0) if Omega(Lambda) = 0. For a spatially flat universe composed of normal matter and a cosmological constant, we find Omega(M) = 0.4(-0.4)(+0.5), Omega(Lambda) = 0.6(-0.5)(+0.4). We demonstrate that with a sample of similar to 30 objects, are 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 +/-0.2.
引用
收藏
页码:46 / 63
页数:18
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