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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Searches for new Milky Way satellites from the first two years of data of the Subaru/Hyper Suprime-Cam survey: Discovery of Cetus?III
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Searches for new Milky Way satellites from the first two years of data of the Subaru/Hyper Suprime-Cam survey: Discovery of Cetus?III

机译：从Subaru / Hyper Suprime-Cam调查的前两年数据中搜索新的银河系卫星：发现Cetus？III

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摘要

We present the results from a search for new Milky Way (MW) satellites from the first two years of data from the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP) ～300?deg2 and report the discovery of a highly compelling ultra-faint dwarf galaxy candidate in Cetus. This is the second ultra-faint dwarf we have discovered after Virgo?I reported in our previous paper. This satellite, Cetus?III, has been identified as a statistically significant (10.7?σ) spatial overdensity of star-like objects, which are selected from a relevant isochrone filter designed for a metal-poor and old stellar population. This stellar system is located at a heliocentric distance of 251|$^{+24}_{-11}:$|kpc with a most likely absolute magnitude of MV = ?2.4 ± 0.6?mag estimated from a Monte Carlo analysis. Cetus?III is extended with a half-light radius of |$r_h = 90^{+42}_{-17}:$|pc, suggesting that this is a faint dwarf satellite in the MW located beyond the detection limit of the Sloan Digital Sky Survey. Further spectroscopic studies are needed to assess the nature of this stellar system. We also revisit and update the parameters for Virgo?I, finding |$M_V = -0.33^{+0.75}_{-0.87}:$|mag and |$r_h = 47^{+19}_{-13}:$|pc. Using simulations of Λ-dominated cold dark matter models, we predict that we should find one or two new MW satellites from ～300?deg2 HSC-SSP data, in rough agreement with the discovery rate so far. The further survey and completion of HSC-SSP over ～1400?deg2 will provide robust insights into the missing satellites problem.
机译：我们提供的是从超级Suprime-Cam（HSC）斯巴鲁战略计划（SSP）〜300？deg2的前两年数据中搜索新的银河（MW）卫星的结果，并报告了极具吸引力的超新星的发现特斯的微弱矮星系候选者。这是继处女座之后，我们发现的第二个超微弱侏儒。这颗卫星Cetus？III被确定为星状物体的统计上显着（10.7？σ）的空间密度，它是从为贫金属和老星族设计的相关等时线滤波器中选择的。这个恒星系统位于251 | $ ^ {+ 24} _ {-11} ：$ | kpc的日心距离上，根据蒙特卡洛分析估计，其最有可能的绝对振幅为MV =？2.4±0.6？mag。 Cetus？III的半光半径||||||||||||||||||||||||||||||||||| r_r_h]的半光半径扩展为： Sloan数字天空调查。需要进一步的光谱学研究来评估这种恒星系统的性质。我们还重新访问并更新了Virgo？I的参数，找到| $ M_V = -0.33 ^ {+ 0.75} _ {-0.87} ：$ | mag和| $ r_h = 47 ^ {+ 19} _ {-13} ：$ | pc通过对Λ为主的冷暗物质模型的模拟，我们预测应该从〜300？deg2 HSC-SSP数据中找到一两个新的兆瓦卫星，与迄今为止的发现率大致吻合。 〜1400°2范围内HSC-SSP的进一步调查和完成将提供有关缺失卫星问题的可靠见解。

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