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arXiv 2005.07112astro-ph.GAastro-ph.CO
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参见变化:高红移Ia型超新星宿主星系样本的VLT光谱学

See Change: VLT spectroscopy of a sample of high-redshift Type Ia supernova host galaxies

S. C. Williams, I. M. Hook, B. Hayden, J. Nordin, G. Aldering, K. Boone, A. Goobar, C. E. Lidman, S. Perlmutter, D. Rubin, P. Ruiz-Lapuente, C. Saunders

摘要:

超新星宇宙学项目开展了“看到变化”方案,旨在发现和观测高红移(1.13 $\leq$ z $\leq$ 1.75)的Ia型超新星(SNe Ia)。我们使用哈勃太空望远镜(HST)的多滤波器观测大质量星系团,有足够的节奏,使观测到的SN Ia光变曲线适合于宇宙学探测z > 0.5的暗能量。这张Ia超新星的多色光变样本将是迄今为止在这些红移下最大的。作为See Change计划的一部分,我们获得了每个发现的瞬变和/或其宿主星系的地基光谱。在这里,我们提出了甚大望远镜(VLT)看到变化瞬态宿主星系的光谱,推导出它们的红移,和主机参数,如恒星质量和恒星形成率。在使用VLT观察到的39个See Change瞬变/宿主中,我们成功地确定了26个的红移,包括15个z > 0.97的SNe Ia。我们表明,即使在被动的环境中,它是可能的,以恢复安全的红移为大多数SN主机到z = 1.5。我们发现,在8米级望远镜上,典型的曝光时间为3 - 4小时,我们可以在0.97 < z < 1.5的范围内恢复约75%的SN Ia红移。此外,我们表明,HST测光和VLT光谱的组合是能够提供足够准确的用于在宇宙学分析中的质量阶跃校正的宿主星系恒星质量的估计。

英文摘要:

The Supernova Cosmology Project has conducted the `See Change' programme, aimed at discovering and observing high-redshift (1.13 $\leq$ z $\leq$ 1.75) Type Ia supernovae (SNe Ia). We used multi-filter Hubble Space Telescope (HST) observations of massive galaxy clusters with sufficient cadence to make the observed SN Ia light curves suitable for a cosmological probe of dark energy at z > 0.5. This See Change sample of SNe Ia with multi-colour light curves will be the largest to date at these redshifts. As part of the See Change programme, we obtained ground-based spectroscopy of each discovered transient and/or its host galaxy. Here we present Very Large Telescope (VLT) spectra of See Change transient host galaxies, deriving their redshifts, and host parameters such as stellar mass and star formation rate. Of the 39 See Change transients/hosts that were observed with the VLT, we successfully determined the redshift for 26, including 15 SNe Ia at z > 0.97. We show that even in passive environments, it is possible to recover secure redshifts for the majority of SN hosts out to z = 1.5. We find that with typical exposure times of 3 - 4 hrs on an 8m-class telescope we can recover ~75% of SN Ia redshifts in the range of 0.97 < z < 1.5. Furthermore, we show that the combination of HST photometry and VLT spectroscopy is able to provide estimates of host galaxy stellar mass that are sufficiently accurate for use in a mass-step correction in the cosmological analysis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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