ERRATUM: “TWO SNe Ia AT REDSHIFT ∼2: IMPROVED CLASSIFICATION AND REDSHIFT DETERMINATION WITH MEDIUM-BAND INFRARED IMAGING” (2015, AJ, 150, 156)
ERRATUM: “TWO SNe Ia AT REDSHIFT ∼2: IMPROVED CLASSIFICATION AND REDSHIFT DETERMINATION WITH MEDIUM-BAND INFRARED IMAGING” (2015, AJ, 150, 156)
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DOI：
10.3847/0004-6256/151/2/47
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发表时间：
2015-08
期刊：
影响因子：
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通讯作者：
S. Rodney;A. Riess;D. Scolnic;David O. Jones;S. Hemmati;A. Molino;C. McCully;B. Mobasher;
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文献类型：
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作者：
S. Rodney;A. Riess;D. Scolnic;David O. Jones;S. Hemmati;A. Molino;C. McCully;B. Mobasher;
我们提出了两个超新星（SNe）发现与哈勃太空望远镜（HST）在宇宙组装近红外深河外遗产调查（CANDELS），HST多周期国库计划。我们将这两个天体归类为Ia型超新星，并发现红移z = 1.80+-0.02和2.26 +0.02-0.10，后者是迄今为止发现的最高红移Ia型超新星。使用光变曲线拟合，我们确定光度距离，并发现这两个对象是符合标准的Lambda-CDM宇宙学模型。这些SNe是使用HST宽视场相机3红外探测器（WFC 3-IR）观察到的，在宽带和中频滤波器中成像。我们证明，分类和红移估计显着改善包括单历元中带观测。这种中波段成像近似于一个非常低的分辨率光谱（λ/Δ λ ~ 100），可以隔离宽光谱吸收特征，区分Ia型SNe从他们最常见的核心崩溃表兄弟。这种中波段方法对尘埃消光也不敏感，并且（与棱镜光谱学不同）它不受SN宿主星系或其他附近来源的污染的影响。因此，它可以提供一个更有效的-虽然不太精确-替代红外光谱的高z SNe。
We present two supernovae (SNe) discovered with the Hubble Space Telescope (HST) in the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS), an HST multi-cycle treasury program. We classify both objects as Type Ia SNe and find redshifts of z = 1.80+-0.02 and 2.26 +0.02 -0.10, the latter of which is the highest redshift Type Ia SN yet seen. Using light curve fitting we determine luminosity distances and find that both objects are consistent with a standard Lambda-CDM cosmological model. These SNe were observed using the HST Wide Field Camera 3 infrared detector (WFC3-IR), with imaging in both wide- and medium-band filters. We demonstrate that the classification and redshift estimates are significantly improved by the inclusion of single-epoch medium-band observations. This medium-band imaging approximates a very low resolution spectrum (lambda/delta lambda ~ 100) which can isolate broad spectral absorption features that differentiate Type Ia SNe from their most common core collapse cousins. This medium-band method is also insensitive to dust extinction and (unlike grism spectroscopy) it is not affected by contamination from the SN host galaxy or other nearby sources. As such, it can provide a more efficient - though less precise - alternative to IR spectroscopy for high-z SNe.