arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.05581astro-ph.GA
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超级凸轮斯巴鲁战略计划揭示的近距离双超大质量黑洞

Dual supermassive black holes at close separation revealed by the Hyper Suprime-Cam Subaru Strategic Program

John D. Silverman, Shenli Tang, Khee-Gan Lee, Tilman Hartwig, Andy Goulding, Michael A. Strauss, Malte Schramm, Xuheng Ding, Rogemar Riffel, Seiji Fujimoto, Chi… 展开作者

John D. Silverman, Shenli Tang, Khee-Gan Lee, Tilman Hartwig, Andy Goulding, Michael A. Strauss, Malte Schramm, Xuheng Ding, Rogemar Riffel, Seiji Fujimoto, Chiaki Hikage, Masatoshi Imanishi, Kazushi Iwasawa, Knud Jahnke, Issha Kayo, Nobunari Kashikawa, Toshihiro Kawaguchi, Kotaro Kohno, Wentao Luo, Yoshiki Matsuoka, Yuichi Matsuda, Tohru Nagao, Masamune Oguri, Yoshiaki Ono, Masafusa Onoue, Masami Ouchi, Kazuhiro Shimasaku, Hyewon Suh, Nao Suzuki, Yoshiaki Taniguchi, Yoshiki Toba, Yoshihiro Ueda, Naoki Yasuda

摘要:

超级凸轮(HSC)斯巴鲁战略计划的卓越空间分辨率,广域覆盖和深度光学成像的独特组合被用来搜索双类星体候选者。我们对34,476个已知的SDSS类星体进行了自动化图像分析,在覆盖796度^[2]的HSC图像中,我们识别出了那些具有两个(或更多)不同光学点源的类星体。我们发现了421个红移为4.5的候选者,其中100个左右在过滤掉污染恒星后更有可能。0.6 - 4.0”的角间距对应于3 - 30 kpc的投影间距,这是一个相对未被探索的明亮对偶类星体的种群研究范围。使用Bikk-I/LRIS和Gemini-N/NIFS,我们在光谱上确认了三个z < 1的对偶类星体系统,其中两个是以前未知的八个观测到的,基于每个组件中特征宽发射线的存在,同时强调其中一对中一个物体的连续体是红色的。在所有情况下,[OIII]5007发射谱线具有轻微的速度偏移,因此联合[OIII]谱线轮廓不是双峰。我们发现了一个0.26+/-0.18%的对偶类星体,没有进化的证据。与地平线活动星系核模拟的比较似乎支持的情况下,没有演变的对偶类星体分数时,广泛匹配的类星体选择。这些结果可能表明,在这种情况下,发光类星体的同时触发的频率并不像预期的那样敏感的合并率或星系的气体含量的宇宙演化。

英文摘要:

The unique combination of superb spatial resolution, wide-area coverage, and deep depth of the optical imaging from the Hyper Suprime-Cam (HSC) Subaru Strategic Program is utilized to search for dual quasar candidates. Using an automated image analysis routine on 34,476 known SDSS quasars, we identify those with two (or more) distinct optical point sources in HSC images covering 796 deg^2. We find 421 candidates out to a redshift of 4.5 of which one hundred or so are more likely after filtering out contaminating stars. Angular separations of 0.6 - 4.0" correspond to projected separations of 3 - 30 kpc, a range relatively unexplored for population studies of luminous dual quasars. Using Keck-I/LRIS and Gemini-N/NIFS, we spectroscopically confirm three dual quasar systems at z < 1, two of which are previously unknown out of eight observed, based on the presence of characteristic broad emission lines in each component, while highlighting that the continuum of one object in one of the pairs is reddened. In all cases, the [OIII]5007 emission lines have mild velocity offsets, thus the joint [OIII] line profile is not double-peaked. We find a dual quasar fraction of 0.26+/-0.18% and no evidence for evolution. A comparison with the Horizon-AGN simulation seems to support the case of no evolution in the dual quasar fraction when broadly matching the quasar selection. These results may indicate a scenario in which the frequency of the simultaneous triggering of luminous quasars is not as sensitive as expected to the cosmic evolution of the merger rate or gas content of galaxies.

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