The ESO/VLT 3rd year Type Ia supernova data set from the supernova legacy survey-猫眼课题宝

DOI：

10.1051/0004-6361/200912246

发表时间：

2009-09

期刊：

Astronomy and Astrophysics

影响因子：

6.5

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

C. Balland;S. Baumont;S. Basa;M. Mouchet;D. Howell;D. Howell;P. Astier;R. Carlberg;A. Conley;D. Fouchez;J. Guy;D. Hardin;I. Hook;R. Pain;K. Perrett;C. Pritchet;N. Regnault;J. Rich;Mark Sullivan;P. Antilogus;V. Arsenijević;V. Arsenijević;J. L. Du;S. Fabbro;C. Lidman;A. Mourão;N. Palanque-Delabrouille;E. Pecontal;V. Ruhlmann-Kleider

目的：介绍在加拿大-法国-哈瓦伊望远镜(CFHT)超新星遗产调查(SNLS)的头三年中在ESO/VLT观测到的124个Ia型超新星(SNE Ia)的139个光谱。这个均匀的数据集被用来测试SNIa谱的红移演化，并将用于SNLS第三年的宇宙学分析。方法：利用一条专用的管道对光谱进行简化和提取，该管道使用来自深度CFHT遗留调查(CFHT-LS)参考图像的光度信息，以亚像素精度跟踪作为波长函数的超新星在光谱图上的位置。在大约60%的情况下，它还将超新星和它的宿主光分开。超新星候选者的识别是使用分光光度SNIa模型进行的。结果：在调查的前三年，使用ESO/VLT共鉴定出124个SNE Ia，约占整个SNLS光谱样本的50%。它们的红移范围从z=0.149到z=1.031。样品的平均红移为z=0.63±0.02。这构成了这个红移范围内迄今为止最大的SN Ia光谱集。给出了光谱及其最佳拟合谱SNIa模型和相关的宿主模型。在后一种情况下，还给出了主减谱。我们为z&lt；0.5和z≥0.5SNE Ia产生了最大前、最大和最大后极大历元的平均光谱。我们发现z&lt；0.5谱比z≥0.5谱对中等质量元素有更深的吸收。与红移的差异与高红移时选择更亮、更蓝的超新星是一致的。根据由智利欧洲南方天文台(ESO大计划171.A-0486和176.A-0589)运营的帕拉纳尔上的甚大望远镜用FORS1和FORS2获得的观测结果。附录仅以电子形式在http://www.aanda.org上提供

Aims: We present 139 spectra of 124 Type Ia supernovae (SNe Ia) that were observed at the ESO/VLT during the first three years of the Canada-France-Hawai Telescope (CFHT) supernova legacy survey (SNLS). This homogeneous data set is used to test for redshift evolution of SN Ia spectra, and will be used in the SNLS 3rd year cosmological analyses. Methods: Spectra have been reduced and extracted with a dedicated pipeline that uses photometric information from deep CFHT legacy survey (CFHT-LS) reference images to trace, at sub-pixel accuracy, the position of the supernova on the spectrogram as a function of wavelength. It also separates the supernova and its host light in ~60% of cases. The identification of the supernova candidates is performed using a spectrophotometric SN Ia model. Results: A total of 124 SNe Ia, roughly 50% of the overall SNLS spectroscopic sample, have been identified using the ESO/VLT during the first three years of the survey. Their redshifts range from z = 0.149 to z = 1.031. The average redshift of the sample is z = 0.63±0.02. This constitutes the largest SN Ia spectral set to date in this redshift range. The spectra are presented along with their best-fit spectral SN Ia model and a host model where relevant. In the latter case, a host subtracted spectrum is also presented. We produce average spectra for pre-maximum, maximum and post-maximum epochs for both z < 0.5 and z ≥ 0.5 SNe Ia. We find that z < 0.5 spectra have deeper intermediate mass element absorptions than z ≥ 0.5 spectra. The differences with redshift are consistent with the selection of brighter and bluer supernovae at higher redshift. Based on observations obtained with FORS1 and FORS2 at the Very Large Telescope on Cerro Paranal, operated by the European Southern Observatory, Chile (ESO Large Programs 171.A-0486 and 176.A-0589). Appendix is only available in electronic form at http://www.aanda.org

The ESO/VLT 3rd year Type Ia supernova data set from the supernova legacy survey

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