Quantitative comparison between Type Ia supernova spectra at low and high redshifts: A case study
Quantitative comparison between Type Ia supernova spectra at low and high redshifts: A case study
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DOI：
10.1051/0004-6361:20065400
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发表时间：
2007-03
影响因子：
6.5
通讯作者：
G. Garavini;G. Garavini;G. Folatelli;S. Nobili;G. Aldering;R. Amanullah;P. Antilogus;P. Astier
中科院分区：
文献类型：
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作者：
G. Garavini;G. Garavini;G. Folatelli;S. Nobili;G. Aldering;R. Amanullah;P. Antilogus;P. Astier
我们发展了一种测量Ia型超新星(SNIa)光谱吸收特征强度的方法，并用它对Ia型超新星在低红移和高红移时的光谱进行了定量比较。在这个例子中，我们将该方法应用于超新星宇宙学计划观测到的12个高红移(0.212≤z≤0.912)SneIa。通过测量这些特征的强度和CaⅡH&K吸收极小值的蓝移，我们表明高红移的SNE Ia的光谱与附近的SNE Ia(z<；0.15)的光谱定量地相似。在我们的高红移样本中，一颗超新星SN2002fd的z=0.279被发现，它的光谱特征与特殊的SN1991T/SN1999aa类超新星有关。
We develop a method to measure the strength of the absorption features in Type Ia supernova (SN Ia) spectra and use it to make a quantitative comparison between the spectra of Type Ia supernovae at low and high redshifts. In this case study, we apply the method to 12 high-redshift (0.212 ≤ z ≤ 0.912) SNe Ia observed by the Supernova Cosmology Project . Through measurements of the strengths of these features and of the blueshift of the absorption minimum in Ca ii H&K, we show that the spectra of the high-redshift SNe Ia are quantitatively similar to spectra of nearby SNe Ia (z < 0.15). One supernova in our high redshift sample, SN 2002fd at z=0.279, is found to have spectral characteristics that are associated with peculiar SN 1991T/SN 1999aa-like supernovae.