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arXiv 1608.06288astro-ph.COastro-ph.GA
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超极凸轮巡天的一个新的四重引力透镜:HSC ~ J115252 +004733之谜

A new quadruple gravitational lens from the Hyper Suprime-Cam Survey: the puzzle of HSC~J115252+004733

Anupreeta More, Chien-Hsiu Lee, Masamune Oguri, Yoshiaki Ono, Sherry H. Suyu, James H. H. Chan, John D. Silverman, Surhud More, Andreas Schulze, Yutaka Komiyama… 展开作者

Anupreeta More, Chien-Hsiu Lee, Masamune Oguri, Yoshiaki Ono, Sherry H. Suyu, James H. H. Chan, John D. Silverman, Surhud More, Andreas Schulze, Yutaka Komiyama, Yoshiki Matsuoka, Satoshi Miyazaki, Tohru Nagao, Masami Ouchi, Philip J. Tait, Manobu M. Tanaka, Masayuki Tanaka, Tomonori Usuda, Naoki Yasuda

摘要:

我们报告了在超极凸轮(HSC)巡天中偶然发现的一个位于$z_{\rm s}=3.76$(HSC~J115252+004733)的四重透镜源。该源被位于$z_{\rm l}=0.466$的早型星系和一个卫星星系透镜化。在这里,我们研究的源的性质,通过研究其大小和亮度从成像和亮度和亮度和速度宽度的Ly- $α$线的光谱。我们的分析表明,该源最有可能是一个低光度的活动星系核(LLAGN),但它也有可能是一个紧凑的明亮星系(例如,$α$发射器或LymanBreakGalaxy)。较亮的一对透镜图像除了在HSC $i$带(具有视宁$\sim0.5"$)中之外呈现点状。在$i$波段图像中的扩展发射可能是由于活动星系核下面的宿主星系,或者是由于一个高度紧凑的透镜星系(没有活动星系核),它在除了$i$波段之外的所有波段都呈点状。我们还发现,较亮的一对图像的通量比是不同的,在KS波段相比,光学波长。像微分消光和内在变异这样的现象不能解释这种色变。虽然前景星系中恒星的微透镜不太可能是原因,但也不能完全排除。如果星系拥有活动星系核,那么这代表了迄今为止已知的最高红移的四重成像活动星系核,使遥远的LLAGN的研究成为可能。这个异常致密和微弱的源的发现表明了HSC调查的潜力。

英文摘要:

We report the serendipitous discovery of a quadruply lensed source at $z_{\rm s}=3.76$, HSC~J115252+004733, from the Hyper Suprime-Cam (HSC) Survey. The source is lensed by an early-type galaxy at $z_{\rm l}=0.466$ and a satellite galaxy. Here, we investigate the properties of the source by studying its size and luminosity from the imaging and the luminosity and velocity width of the Ly-$α$ line from the spectrum. Our analyses suggest that the source is most probably a low-luminosity active galactic nucleus (LLAGN) but the possibility of it being a compact bright galaxy (e.g., a Lyman-$α$ emitter or Lyman Break Galaxy) cannot be excluded. The brighter pair of lensed images appears point-like except in the HSC $i$-band (with a seeing $\sim0.5"$). The extended emission in the $i$-band image could be due to the host galaxy underneath the AGN, or alternatively, due to a highly compact lensed galaxy (without AGN) which appears point-like in all bands except in $i$-band. We also find that the flux ratio of the brighter pair of images is different in the Ks-band compared to optical wavelengths. Phenomena such as differential extinction and intrinsic variability cannot explain this chromatic variation. While microlensing from stars in the foreground galaxy is less likely to be the cause, it cannot be ruled out completely. If the galaxy hosts an AGN, then this represents the highest redshift quadruply imaged AGN known to date, enabling study of a distant LLAGN. Discovery of this unusually compact and faint source demonstrates the potential of the HSC survey.

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