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arXiv 1010.0509astro-ph.CO
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来自空基超新星调查的暗能量限制

Dark energy constraints from a space-based supernova survey

P. Astier, J. Guy, R. Pain, C. Balland

摘要:

我们提出了一个预测的暗能量的限制,可以从一个大样本的距离Ia型超新星检测和测量从太空中获得。我们模拟了超新星事件,因为它们将被带有两个成像仪的EUCLID类望远镜观察到,假设这些望远镜配备了4个可见光和3个近红外可更换滤光片。我们占已知的系统的不确定性影响宇宙学的约束,包括通过训练的超新星模型,用于适应超新星的光变曲线所产生的。使用保守的假设和普朗克先验,我们发现,一个18个月的调查将产生约束的暗能量状态方程可比的宇宙剪切方法在EUCLID:一个可变的两参数状态方程可以被限制到~0.03在z~0.3。这些约束条件是从z=1.5处的大约13,000颗超新星的距离中推导出来的,这些超新星是在10度和50度的两个圆锥^[2]中观测到的。这些限制并不需要从地面测量附近的超新星样本。只要EUCLID上能安装可更换的滤光片,就能从太空测量超新星的距离,并有助于获得对暗能量性质的最精确的限制。

英文摘要:

We present a forecast of dark energy constraints that could be obtained from a large sample of distances to Type Ia supernovae detected and measured from space. We simulate the supernova events as they would be observed by a EUCLID-like telescope with its two imagers, assuming those would be equipped with 4 visible and 3 near infrared swappable filters. We account for known systematic uncertainties affecting the cosmological constraints, including those arising through the training of the supernova model used to fit the supernovae light curves. Using conservative assumptions and Planck priors, we find that a 18 month survey would yield constraints on the dark energy equation of state comparable to the cosmic shear approach in EUCLID: a variable two-parameter equation of state can be constrained to ~0.03 at z~0.3. These constraints are derived from distances to about 13,000 supernovae out to z=1.5, observed in two cones of 10 and 50 deg^2. These constraints do not require measuring a nearby supernova sample from the ground. Provided swappable filters can be accommodated on EUCLID, distances to supernovae can be measured from space and contribute to obtain the most precise constraints on dark energy properties.

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