Discovery of a hyperluminous quasar at <i>z</i> = 1.62 with Eddington ratio &amp;gt;3 in the eFEDS field confirmed by KOOLS-IFU on Seimei Telescope

Abstract We report the discovery of a hyperluminous type 1 quasar (eFEDS J082826.9-013911; eFEDS J0828-0139) at $z_{\rm spec} = 1.622$ with a super-Eddington ratio ($\lambda _{\rm Edd}$). We perform the optical spectroscopic observations with KOOLS-IFU (the Kyoto Okayama Optical Low-dispersion Spectrograph with optical fiber) on the Seimei Telescope. The black hole mass ($M_{\rm BH}$) based on the single-epoch method with Mg ii$\lambda$2798 is estimated to be $M_{\rm BH} = {(6.2 \pm 1.2) }\times 10^8\, M_{\odot }$. To measure the precise infrared luminosity ($L_{\rm IR}$), we obtain submillimeter data taken by SCUBA-2 on the James Clerk Maxwell Telescope and conduct the spectral energy distribution analysis with X-ray to submillimeter data. We find that $L_{\rm IR}$ of eFEDS J0828-0139 is $L_{\rm IR} = {(6.8 \pm 1.8)} \times 10^{13}\, L_{\odot }$, confirming the existence of a hypeluminous infrared galaxy. $\lambda _{\rm Edd}$ is estimated to be $\lambda _{\rm Edd} = {3.6 \pm 0.7}$, making it a quasar with one of the highest BH mass accretion rates at cosmic noon.

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Publication Details

Journal
Publications of the Astronomical Society of Japan
Published
2024-09-20
DOI
https://doi.org/10.1093/pasj/psae078
Citations
2
Primary Topic
Galaxies: Formation, Evolution, Phenomena
Type
article
Field-Weighted Citation Impact
0.66

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article

Discovery of a hyperluminous quasar at z = 1.62 with Eddington ratio &gt;3 in the eFEDS field confirmed by KOOLS-IFU on Seimei Telescope

Anri Yanagawa, Kohei Shibata, Zhen-Kai Gao, Wei-Hao Wang et al.
2 citations
Publications of the Astronomical Society of Japan
Galaxies: Formation, Evolution, Phenomena
0.66
article

Discovery of a hyperluminous quasar at z = 1.62 with Eddington ratio &gt;3 in the eFEDS field confirmed by KOOLS-IFU on Seimei Telescope

Anri Yanagawa, Kohei Shibata, Zhen-Kai Gao, Wei-Hao Wang, Takumi Kakimoto, Tohru Nagao, Yoshiki Toba, Masayuki Tanaka, Naomi Ota, Masatoshi Imanishi, Aika Oki, Satoshi Yamada, Sayaka Takeuchi, Itsuki Dosaka, Seira Kobayashi, Yoshihiro Ueda, Sorami Soga, Yukana Tsujita, N Kurokawa, Keito Masu
article en
2 citations

Abstract

Abstract We report the discovery of a hyperluminous type 1 quasar (eFEDS J082826.9-013911; eFEDS J0828-0139) at $z_{\rm spec} = 1.622$ with a super-Eddington ratio ($\lambda _{\rm Edd}$). We perform the optical spectroscopic observations with KOOLS-IFU (the Kyoto Okayama Optical Low-dispersion Spectrograph with optical fiber) on the Seimei Telescope. The black hole mass ($M_{\rm BH}$) based on the single-epoch method with Mg ii$\lambda$2798 is estimated to be $M_{\rm BH} = {(6.2 \pm 1.2) }\times 10^8\, M_{\odot }$. To measure the precise infrared luminosity ($L_{\rm IR}$), we obtain submillimeter data taken by SCUBA-2 on the James Clerk Maxwell Telescope and conduct the spectral energy distribution analysis with X-ray to submillimeter data. We find that $L_{\rm IR}$ of eFEDS J0828-0139 is $L_{\rm IR} = {(6.8 \pm 1.8)} \times 10^{13}\, L_{\odot }$, confirming the existence of a hypeluminous infrared galaxy. $\lambda _{\rm Edd}$ is estimated to be $\lambda _{\rm Edd} = {3.6 \pm 0.7}$, making it a quasar with one of the highest BH mass accretion rates at cosmic noon.

Publications of the Astronomical Society of JapanVol. 76(6)
Institute of Astronomy and Astrophysics, Academia Sinica (TW), Pioneer (United States) (US), The Graduate University for Advanced Studies, SOKENDAI (JP), National Central University (TW), Kyoto University (JP), RIKEN (JP), Institute of Astronomy (RU), National Astronomical Observatory of Japan (JP), Ehime University (JP), The University of Tokyo (JP), Nara Women's University (JP)
Japan Society for the Promotion of Science, National Key Research and Development Program of China
Openalex Percentile: Top 28%
Galaxies: Formation, Evolution, Phenomena
0.66
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