Supernovae in the Subaru Deep Field: an initial sample and Type Ia rate out to redshift 1.6
Supernovae in the Subaru Deep Field: an initial sample and Type Ia rate out to redshift 1.6
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DOI：
10.1111/j.1365-2966.2007.12424.x
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发表时间：
2007-07
影响因子：
4.8
通讯作者：
D. Poznanski;D. Maoz;N. Yasuda;R. Foley;M. Doi;A. Filippenko;M. Fukugita;A. Gal-yam;B. Jannuzi;T. Morokuma;T. Oda;H. Schweiker;K. Sharon;J. Silverman;T. Totani
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文献类型：
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作者：
D. Poznanski;D. Maoz;N. Yasuda;R. Foley;M. Doi;A. Filippenko;M. Fukugita;A. Gal-yam;B. Jannuzi;T. Morokuma;T. Oda;H. Schweiker;K. Sharon;J. Silverman;T. Totani
高红移超新星（SNe）的大样本是宇宙星星形成、金属富集和超新星物理学的潜在有力探测器。我们介绍了一项新的深SN调查的初步结果，该调查是基于使用8.2米斯巴鲁望远镜和Suprime-Cam对0.25度^2斯巴鲁深场（SDF）的R、i '、z'波段进行重新成像。在一个由两个晚上的观测组成的新纪元中，我们发现了33个候选SNe，z波段的星等为26.3（AB）。我们测量了SN宿主星系的光度红移，获得了17个宿主星系的Keck光谱红移，并使用Poznanski等人的贝叶斯光度算法对SNe进行了分类。在对分类中的偏差进行校正后，我们的样本中有55%是Ia型SNe，45%是核心塌陷型SNe。超新星Ia的红移分布达到z = 1.6，中值为z = 1.2。堆芯坍塌SNe达到z ≥ 1.0，中值为z ≥ 0.5。我们的SN样本在大小和红移范围上都与哈勃太空望远镜/大天文台起源深度调查（GOODS）样本相当。SDF和GOODS中SNe的红移分布是一致的，但SDF中有一种倾向（需要使用更大的样本进行确认），即更多的高z SNe Ia。在将我们得出的超新星Ia速率与基于GOODS数据的速率进行比较时，这一趋势也很明显。我们的研究结果表明，在高红移下有一个相当恒定的速率，可以跟踪星星的形成速率。已经获得的关于这个领域的其他历元，将把我们的SN样本扩大到数百个，并确定在z 1处SN Ia速率是否下降。
Large samples of high-redshift supernovae (SNe) are potentially powerful probes of cosmic star formation, metal enrichment and SN physics. We present initial results from a new deep SN survey, based on re-imaging in the R, i', z' bands, of the 0.25 deg^2 Subaru Deep Field (SDF), with the 8.2-m Subaru telescope and Suprime-Cam. In a single new epoch consisting of two nights of observations, we have discovered 33 candidate SNe, down to a z'-band magnitude of 26.3 (AB). We have measured the photometric redshifts of the SN host galaxies, obtained Keck spectroscopic redshifts for 17 of the host galaxies and classified the SNe using the Bayesian photometric algorithm of Poznanski et al. that relies on template matching. After correcting for biases in the classification, 55 per cent of our sample consists of Type Ia SNe and 45 per cent of core-collapse SNe. The redshift distribution of the SNe Ia reaches z ≈ 1.6, with a median of z ≈ 1.2. The core-collapse SNe reach z ≈ 1.0, with a median of z ≈ 0.5. Our SN sample is comparable to the Hubble Space Telescope/Great Observatories Origins Deep Survey (GOODS) sample in both size and redshift range. The redshift distributions of the SNe in the SDF and in GOODS are consistent, but there is a trend (which requires confirmation using a larger sample) for more high-z SNe Ia in the SDF. This trend is also apparent when comparing the SN Ia rates we derive to those based on GOODS data. Our results suggest a fairly constant rate at high redshift that could be tracking the star formation rate. Additional epochs on this field, already being obtained, will enlarge our SN sample to the hundreds, and determine whether or not there is a decline in the SN Ia rate at z ≳ 1.