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26 April 2024 |
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A new quadruple gravitational lens from the Hyper Suprime-Cam Survey: the dilemma 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
; Yoshiki Matsuoka
; Satoshi Miyazaki
; Tohru Nagao
; Masami Ouchi
; Philip J. Tait
; Manobu M. Tanaka
; Masayuki Tanaka
; Tomonori Usuda
; Naoki Yasuda
; | | Date: |
22 Aug 2016 | | Abstract: | We report the serendipitous discovery of a quadruply (quad) lensed source at
redshift $z_{
m s}=3.76$, HSC~J115252+004733, from the Subaru Hyper
Suprime-Cam (HSC) Survey. The source is lensed by an early-type galaxy at
$z_{
m l}=0.466$ along with a satellite galaxy. Here, we investigate the
nature of the source by studying its size, luminosity and from follow-up
spectroscopy, the luminosity and velocity width of the Ly-$alpha$ emission
line. Our analyses suggest that the source is most probably a low-luminosity
active galactic nucleus (AGN) or possibly an unusually compact and bright
galaxy such as a Lyman-$alpha$ emitter or a Lyman Break Galaxy. The morphology
of the brighter pair of lensed images appears point-like except in the HSC
$i$-band which was observed in better seeing conditions (0.5"). The extended
feature in the $i$-band image can be explained by the emission from the host
galaxy of the AGN, or alternatively, the highly compact lensed galaxy which
appears point-like in all bands expect in $i$-band. We also find that the flux
ratio of the brighter pair of images show variation in the near-infrared
compared to the optical imaging. 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. Discovery
of this unusually compact and faint source demonstrates the potential of the
HSC survey. | | Source: | arXiv, 1608.6288 | | Services: | Forum | Review | PDF | Favorites | |
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