研究首例经光谱确认的红移二处超新星的紫外光谱
高能天体物理现象
2018-02-21 v1 宇宙学与河外天体物理
星系天体物理
太阳与恒星天体物理
摘要
我们展示了 DES16C2nm 的观测结果，这是首例在红移 z~2 处经光谱确认的无氢超亮超新星（SLSN-I）。DES16C2nm 由暗能量巡天（DES）超新星计划发现，哈勃空间望远镜、双子星望远镜和欧洲南方天文台甚大望远镜的测光后续数据补充了 DES 数据。光谱观测确认 DES16C2nm 位于 z=1.998，且在光谱上与 Gaia16apd（z=0.102 处的 SLSN-I）相似，峰值绝对星等为 U=-22.260.06。DES16C2nm 的高红移为研究 SLSNe-I 的紫外（UV）性质提供了独特机会。将 DES16C2nm 与文献中十个类似事件结合，我们表明在 UV（~2500A）处存在一类均匀的 SLSNe-I，其在（静止帧）U 波段具有峰值光度，且向更短波长吸收增强。没有证据表明 SLSNe-I 的平均测光和光谱性质在低（z<1）和高红移（z>1）间存在差异，但有明确证据表明在 <2000A 处光谱存在多样性，可能由事件间温度差异引起。未观测到谱线速度与会光度之间的显著相关性。利用这些数据，我们估计 DES 可发现至 z=3.8 的 SLSNe-I。虽然 SLSNe-I 通常在低红移（z<1）处由其蓝观测色识别，我们强调在 z>2 时这些事件显得光学偏红，在观测者帧 z 波段达到峰值。此类特征对未来设施如大型综合巡天望远镜、Euclid 和宽场红外巡天望远镜识别这些天体至关重要，它们应分别可探测到 z=3.5、3.7 和 6.6 的此类 SLSNe-I。
引用
@article{arxiv.1712.04535,
title = {Studying the Ultraviolet Spectrum of the First Spectroscopically Confirmed Supernova at redshift two},
author = {M. Smith and M. Sullivan and R. C. Nichol and L. Galbany and C. B. D'Andrea and C. Inserra and C. Lidman and A. Rest and M. Schirmer and A. V. Filippenko and W. Zheng and S. Bradley Cenko and C. R. Angus and P. J. Brown and T. M. Davis and D. A. Finley and S. Gonzalez-Gaitan and C. P. Gutierrez and R. Kessler and S. Kuhlmann and J. Marriner and A. Moller and P. E. Nugent and S. Prajs and R. Thomas and R. Wolf and A. Zenteno and T. M. C. Abbott and F. B. Abdalla and S. Allam and J. Annis and K. Bechtol and A. Benoit-Levy and E. Bertin and D. Brooks and D. L. Burke and A. Carnero Rosell and M. Carrasco Kind and J. Carretero and F. J. Castander and M. Crocce and C. E. Cunha and L. N. da Costa and C. Davis and S. Desai and H. T. Diehl and P. Doel and T. F. Eifler and B. Flaugher and P. Fosalba and J. Frieman and J. Garcia-Bellido and E. Gaztanaga and D. W. Gerdes and D. A. Goldstein and D. Gruen and R. A. Gruendl and J. Gschwend and G. Gutierrez and K. Honscheid and D. J. James and M. W. G. Johnson and K. Kuehn and N. Kuropatkin and T. S. Li and M. Lima and M. A. G. Maia and J. L. Marshall and P. Martini and F. Menanteau and C. J. Miller and R. Miguel and R. L. C. Ogando and D. Petravick and A. A. Plazas and A. K. Romer and E. S. Rykoff and M. Sako and E. Sanchez and V. Scarpine and R. Schindler and M. Schubnell and I. Sevilla-Noarbe and R. C. Smith and M. Soares-Santos and F. Sobreira and E. Suchyta and M. E. C. Swanson and G. Tarle and A. R. Walker},
journal= {arXiv preprint arXiv:1712.04535},
year = {2018}
}
备注
Accepted for publication in ApJ