Tests of the Accelerating Universe with Near-Infrared Observations of a High-Redshift Type Ia Supernova
Tests of the Accelerating Universe with Near-Infrared Observations of a High-Redshift Type Ia Supernova
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DOI：
10.1086/308939
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发表时间：
2000-01
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影响因子：
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通讯作者：
A. Riess;A. Filippenko;Michael C. Liu;P. Challis;A. Clocchiatti;A. Diercks;P. Garnavich;C. Hogan
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文献类型：
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作者：
A. Riess;A. Filippenko;Michael C. Liu;P. Challis;A. Clocchiatti;A. Diercks;P. Garnavich;C. Hogan
我们使用哈勃太空望远镜 (HST) 和地面近红外探测器测量了高红移 Ia 型超新星 (SN Ia)、SN 1999Q (z = 0.46) 的静止坐标系 B、V 和 I 波段光变曲线。这项研究的一个目标是测量颜色过剩 EB-I，这是星际或星系间尘埃的敏感指标，它可能会影响最近对高红移超新星 Ia 的宇宙学测量。我们的观察不赞成用尘埃产生 30% 不透明度的 SN Ia 可见光作为加速宇宙的替代方案。该声明适用于 Aguirre 提出的银河型尘埃（在 3.4 σ 置信水平下拒绝）和灰色尘埃（粒度 > 0.1 μm，在 2.3-2.6 σ 置信水平下拒绝）。静止帧 I 波段光曲线显示了正常光度附近 SNe Ia 典型的 B 最大值之后 1 个月的次最大值，没有提供作为红移函数演化到 z ≈ 0.5 的指示。一组扩展的类似观测可以改善对河外尘埃对高红移超新星 Ia 变暗的影响的限制。
We have measured the rest-frame B-, V-, and I-band light curves of a high-redshift type Ia supernova (SN Ia), SN 1999Q (z = 0.46), using the Hubble Space Telescope (HST) and ground-based near-infrared detectors. A goal of this study is the measurement of the color excess, EB-I, a sensitive indicator of interstellar or intergalactic dust, which could affect recent cosmological measurements from high-redshift SNe Ia. Our observations disfavor a 30% opacity of SN Ia visual light by dust as an alternative to an accelerating universe. This statement applies to both Galactic-type dust (rejected at the 3.4 σ confidence level) and grayer dust (grain size > 0.1 μm, rejected at the 2.3-2.6 σ confidence level) as proposed by Aguirre. The rest-frame I-band light curve shows the secondary maximum 1 month after the B maximum typical of nearby SNe Ia of normal luminosity, providing no indication of evolution as a function of redshift out to z ≈ 0.5. An expanded set of similar observations could improve the constraints on any contribution of extragalactic dust to the dimming of high-redshift SNe Ia.