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哈勃太空望远镜星团超新星巡天:V.改进z>1以上的暗能量约束并建立早期型超新星样本

The Hubble Space Telescope Cluster Supernova Survey: V. Improving the Dark Energy Constraints Above z>1 and Building an Early-Type-Hosted Supernova Sample

N. Suzuki, D. Rubin, C. Lidman, G. Aldering, R. Amanullah, K. Barbary, L. F. Barrientos, J. Botyanszki, M. Brodwin, N. Connolly, K. S. Dawson, A. Dey, M. Doi, M… 展开作者

N. Suzuki, D. Rubin, C. Lidman, G. Aldering, R. Amanullah, K. Barbary, L. F. Barrientos, J. Botyanszki, M. Brodwin, N. Connolly, K. S. Dawson, A. Dey, M. Doi, M. Donahue, S. Deustua, P. Eisenhardt, E. Ellingson, L. Faccioli, V. Fadeyev, H. K. Fakhouri, A. S. Fruchter, D. G. Gilbank, M. D. Gladders, G. Goldhaber, A. H. Gonzalez, A. Goobar, A. Gude, T. Hattori, H. Hoekstra, E. Hsiao, X. Huang, Y. Ihara, M. J. Jee, D. Johnston, N. Kashikawa, B. Koester, K. Konishi, M. Kowalski, E. V. Linder, L. Lubin, J. Melbourne, J. Meyers, T. Morokuma, F. Munshi, C. Mullis, T. Oda, N. Panagia, S. Perlmutter, M. Postman, T. Pritchard, J. Rhodes, P. Ripoche, P. Rosati, D. J. Schlegel, A. Spadafora, S. A. Stanford, V. Stanishev, D. Stern, M. Strovink, N. Takanashi, K. Tokita, M. Wagner, L. Wang, N. Yasuda, H. K. C. Yee

摘要:

我们提出了ACS,NICMOS,和凯克AO辅助测光的20个Ia型超新星SNe Ia从HST星团超新星调查。Ia超新星的红移区间为0.623 < z < 1.415。其中14个Ia超新星通过了我们严格的选择切割,并与世界上的Ia超新星样本结合使用,以获得对暗能量的最佳电流约束。我们发现的10个新的Ia型超新星超过了$z=1$的红移,从而使HST发现的Ia型超新星的统计权重几乎翻了一番。我们的详细分析纠正了最近发现的超新星Ia光度和宿主星系质量之间的相关性,并纠正了NICMOS零点在计数率适合非常遥远的超新星Ia。这些超新星的加入使红移1.0 < z < 1.6处的暗能量密度ρ DE}(z)的最佳组合约束提高了18%(包括系统误差)。对于LambdaCDM宇宙,我们得到Ω_Λ= 0.724 + 0.015/-0.016(68% CL包括系统误差).对于平坦的wCDM模型,我们测量到一个常数的暗能量状态方程参数w = -0.985 +0.071/-0.077(68%CL).在owCDM模型中,曲率被限制在~0.7%,在允许暗能量随参数w_0和w_a变化的模型中,曲率被限制在~2%。进一步收紧对暗能量时间演化的限制将需要几项改进,包括对几十个z>1的超新星Ia样本进行高质量的多通带测光。我们描述了这样一个样本可以有效地获得HST的WFC 3集群字段为目标。

英文摘要:

We present ACS, NICMOS, and Keck AO-assisted photometry of 20 Type Ia supernovae SNe Ia from the HST Cluster Supernova Survey. The SNe Ia were discovered over the redshift interval 0.623 < z < 1.415. Fourteen of these SNe Ia pass our strict selection cuts and are used in combination with the world's sample of SNe Ia to derive the best current constraints on dark energy. Ten of our new SNe Ia are beyond redshift $z=1$, thereby nearly doubling the statistical weight of HST-discovered SNe Ia beyond this redshift. Our detailed analysis corrects for the recently identified correlation between SN Ia luminosity and host galaxy mass and corrects the NICMOS zeropoint at the count rates appropriate for very distant SNe Ia. Adding these supernovae improves the best combined constraint on the dark energy density ρ_{DE}(z) at redshifts 1.0 < z < 1.6 by 18% (including systematic errors). For a LambdaCDM universe, we find Ω_Λ= 0.724 +0.015/-0.016 (68% CL including systematic errors). For a flat wCDM model, we measure a constant dark energy equation-of-state parameter w = -0.985 +0.071/-0.077 (68% CL). Curvature is constrained to ~0.7% in the owCDM model and to ~2% in a model in which dark energy is allowed to vary with parameters w_0 and w_a. Tightening further the constraints on the time evolution of dark energy will require several improvements, including high-quality multi-passband photometry of a sample of several dozen z>1 SNe Ia. We describe how such a sample could be efficiently obtained by targeting cluster fields with WFC3 on HST.

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