发表机构
Université de Strasbourg; CNRS; Observatoire astronomique de Strasbourg（斯特拉斯堡大学; 法国国家科学研究中心; 斯特拉斯堡天文台）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过构建解析模型模拟双星超大质量黑洞场景，利用光谱偏振测量探测类星体Markarian 231的独特紫外-光学性质，并支持未来高灵敏度紫外偏振仪如POLLUX的应用。
AI 中文摘要
几乎所有星系都被认为在其中心存在一个超大质量黑洞。在星系合并的背景下，来自前身星系的超大质量黑洞预计会形成一个束缚双星系统。鉴于此类合并在整个宇宙时间中的高频率，双星超大质量黑洞在活动星系核（AGNs）中应相对常见。然而，它们的直接探测仍然是一个重大的观测挑战，大多数候选体仅通过间接特征被推断出来。类星体Markarian 231呈现出独特的紫外-光学性质，包括在约2500 Å处总通量的非典型下降以及强烈的波长相关偏振。在本工作中，我们探索了光谱偏振测量作为探测和表征AGN中超大质量黑洞双星工具的潜力。我们构建了一个简单的解析模型，以在双星超大质量黑洞情景下重现Mrk 231的谱能量分布（SED），并计算了由此产生的总通量和偏振通量。我们的目标是检验两个不同源的存在是否能重现Markarian 231中观测到的独特紫外-光学性质。此类研究支持未来高灵敏度紫外光谱偏振仪用于探测类星体内部结构的方案。特别是，为宜居世界天文台提出的下一代仪器POLLUX，将特别适合为AGN物理和类星体中的超大质量黑洞双星提供新的见解。
英文摘要
Nearly all galaxies are believed to host a supermassive black hole at their center. In the context of galaxy mergers, the SMBHs from the progenitor galaxies are expected to form a bound binary system. Given the high frequency of such mergers throughout cosmic time, binary SMBHs should be relatively common in active galactic nuclei (AGNs). Yet, their direct detection remains a major observational challenge, with most candidates inferred only through indirect signatures. The quasar Markarian 231 presents unique ultraviolet-optical properties, including an atypical drop in the total flux around 2500 A and a strong wavelength-dependent polarization. In this work, we explore the potential of spectropolarimetry as a tool to detect and characterize SMBH binaries in AGNs. We construct a simple analytical model in order to reproduce the spectral energy distribution (SED) of Mrk 231 taking into account a binary SMBHs scenario and we compute the resulting total and polarized flux. Our goal is to test if the presence of two distinct sources can reproduce the unique ultraviolet-optical properties observed in Markarian 231. Such investigations support the case for future high-sensitivity UV spectropolarimeters in order to probe the inner structure of quasars. In particular, the next-generation instrument POLLUX, proposed for the Habitable Worlds Observatory, would be particularly suited to provide new insights into AGNs physics and supermassive black hole binaries in quasars.
Comments4 pages, 1 figure
