Calibration of AGN Reverberation Distance Measurements
Calibration of AGN Reverberation Distance Measurements
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DOI：
10.3847/2041-8213/aa7553
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
S. Koshida;Y. Yoshii;Yukiyasu Kobayashi;T. Minezaki;K. Enya;M. Suganuma;H. Tomita;T. Aoki;B. Peterson
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文献类型：
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作者：
S. Koshida;Y. Yoshii;Yukiyasu Kobayashi;T. Minezaki;K. Enya;M. Suganuma;H. Tomita;T. Aoki;B. Peterson
在 Yoshii 等人中，我们描述了一种基于活动星系核（AGN）中的尘埃混响来测量河外距离的新方法，并用造父变星验证了我们的新方法。在这封信中，我们用 AGN 监测计划期间两个 AGN 主星系中发生的 Ia 型超新星 (SNe Ia) 验证了我们的新方法：NGC 3786 中的 SN 2004bd 和 NGC 7469 中的 SN 2008ec。使用两种广泛接受的测量 SN 距离的方法观察和分析了它们的多色光变曲线，得出的距离模数针对 SN 2004bd SN 2008ec 为 33.83 ± 0.07。这些结果用于独立获得距离测量校准因子 g。从本信中讨论的 SN Ia 获得的 g 值为 ，在 1σ 不确定性范围内，与 Yoshii 等人之前从头开始计算的 相匹配。在验证了测量河外距离的新方法后，我们使用新方法来校准源自 AGN 宽线区域 Hβ 发射变化的混响距离，将哈勃图扩展到可以区分宇宙学的地方。
In Yoshii et al., we described a new method for measuring extragalactic distances based on dust reverberation in active galactic nuclei (AGNs), and we validated our new method with Cepheid variable stars. In this Letter, we validate our new method with Type Ia supernovae (SNe Ia) that occurred in two of the AGN host galaxies during our AGN monitoring program: SN 2004bd in NGC 3786 and SN 2008ec in NGC 7469. Their multicolor light curves were observed and analyzed using two widely accepted methods for measuring SN distances, and the distance moduli derived are for SN 2004bd and 33.83 ± 0.07 for SN 2008ec. These results are used to obtain independently the distance measurement calibration factor, g. The g value obtained from the SN Ia discussed in this Letter is , which matches, within the range of 1σ uncertainty, , previously calculated ab initio in Yoshii et al. Having validated our new method for measuring extragalactic distances, we use our new method to calibrate reverberation distances derived from variations of Hβ emission in the AGN broad-line region, extending the Hubble diagram to where distinguishing between cosmologies is becoming possible.