哈勃空间望远镜紫外观测揭示 Ia 型超新星多样性证据
高能天体物理现象
2015-05-30 v3 宇宙学与河外天体物理
摘要
本文展示利用哈勃空间望远镜先进巡天相机紫外棱镜获取的四颗 Ia 型超新星（SNe 2004dt、2004ef、2005M 和 2005cf）的紫外光谱与测光数据。该数据集提供了低至 2000 埃的独特光谱时间序列。在这一小样本的近极大光谱（约 2000–3500 埃）中观测到显著多样性。相应的测光数据，结合 Swift 紫外/光学望远镜的档案观测，进一步证明紫外发射相对于光学波段具有更大的弥散度。在 uvw1/F250W 波段测得的峰值光度与 B 波段光变曲线形状参数 dm15(B) 存在相关性，但其弥散度远大于宽波段 B 波段的相关性（例如，对于 0.8 < dm15 < 1.7 mag 的超新星，紫外波段约 0.4 mag，而 B 波段约 0.2 mag）。SN 2004dt 被发现是该相关性的离群值（超过 3 sigma），在 uvw1/F250W 和 uvm2/F220W 滤光片下分别比 SN 2005cf 等正常 Ia 型超新星亮约 0.9 mag 和 2.0 mag。我们证明，仅凭前身星金属丰度或谱线膨胀速度的差异无法解释如此大的偏差。视角效应，例如由非对称爆炸引起的效应，可能对紫外区域发射的通量有显著影响。需要详细建模来厘清和量化上述效应。
引用
@article{arxiv.1110.5809,
title = {Evidence for Type Ia Supernova Diversity from Ultraviolet Observations with the Hubble Space Telescope},
author = {Xiaofeng Wang and Lifan Wang and Alexei V. Filippenko and Eddie Baron and Markus Kromer and Dennis Jack and Tianmeng Zhang and Greg Aldering and Pierre Antilogus and David Arnett and Dietrich Baade and Brian J. Barris and Stefano Benetti and Patrice Bouchet and Adam S. Burrows and Ramon Canal and Enrico Cappellaro and Raymond Carlberg and Elisa di Carlo and Peter Challis and Arlin Crotts and John I. Danziger and Massimo Della Valle and Michael Fink and Ryan J. Foley and Claes Fransson and Avishay Gal-Yam and Peter Garnavich and Chris L. Gerardy and Gerson Goldhaber and Mario Hamuy and Wolfgang Hillebrandt and Peter A. Hoeflich and Stephen T. Holland and Daniel E. Holz and John P. Hughes and David J. Jeffery and Saurabh W. Jha and Dan Kasen and Alexei M. Khokhlov and Robert P. Kirshner and Robert Knop and Cecilia Kozma and Kevin Krisciunas and Brian C. Lee and Bruno Leibundgut and Eric J. Lentz and Douglas C. Leonard and Walter H. G. Lewin and Weidong Li and Mario Livio and Peter Lundqvist and Dan Maoz and Thomas Matheson and Paolo Mazzali and Peter Meikle and Gajus Miknaitis and Peter Milne and Stefan Mochnacki and Ken'Ichi Nomoto and Peter E. Nugent and Elaine Oran and Nino Panagia and Saul Perlmutter and Mark M. Phillips and Philip Pinto and Dovi Poznanski and Christopher J. Pritchet and Martin Reinecke and Adam Riess and Pilar Ruiz-Lapuente and Richard Scalzo and Eric M. Schlegel and Brian Schmidt and James Siegrist and Alicia M. Soderberg and Jesper Sollerman and George Sonneborn and Anthony Spadafora and Jason Spyromilio and Richard A. Sramek and Sumner G. Starrfield and Louis G. Strolger and Nicholas B. Suntzeff and Rollin Thomas and John L. Tonry and Amedeo Tornambe and James W. Truran and Massimo Turatto and Michael Turner and Schuyler D. Van Dyk and Kurt Weiler and J. Craig Wheeler and Michael Wood-Vasey and Stan Woosley and Hitoshi Yamaoka},
journal= {arXiv preprint arXiv:1110.5809},
year = {2015}
}
备注
17 pages, 13 figures, accepted by ApJ