Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XIV. A Candidate Type II Quasar at z=6.1292

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Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XIV. A Candidate Type II Quasar at z=6.1292. / Onoue, Masafusa; Matsuoka, Yoshiki; Kashikawa, Nobunari; Strauss, Michael A.; Iwasawa, Kazushi; Izumi, Takuma; Nagao, Tohru; Asami, Naoko; Fujimoto, Seiji; Harikane, Yuichi; Hashimoto, Takuya; Imanishi, Masatoshi; Lee, Chien-Hsiu; Shibuya, Takatoshi; Toba, Yoshiki.

In: Astrophysical Journal, Vol. 919, No. 1, 61, 29.09.2021.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Onoue, M, Matsuoka, Y, Kashikawa, N, Strauss, MA, Iwasawa, K, Izumi, T, Nagao, T, Asami, N, Fujimoto, S, Harikane, Y, Hashimoto, T, Imanishi, M, Lee, C-H, Shibuya, T & Toba, Y 2021, 'Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XIV. A Candidate Type II Quasar at z=6.1292', Astrophysical Journal, vol. 919, no. 1, 61. https://doi.org/10.3847/1538-4357/ac0f07

APA

Onoue, M., Matsuoka, Y., Kashikawa, N., Strauss, M. A., Iwasawa, K., Izumi, T., Nagao, T., Asami, N., Fujimoto, S., Harikane, Y., Hashimoto, T., Imanishi, M., Lee, C-H., Shibuya, T., & Toba, Y. (2021). Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XIV. A Candidate Type II Quasar at z=6.1292. Astrophysical Journal, 919(1), [61]. https://doi.org/10.3847/1538-4357/ac0f07

Vancouver

Onoue M, Matsuoka Y, Kashikawa N, Strauss MA, Iwasawa K, Izumi T et al. Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XIV. A Candidate Type II Quasar at z=6.1292. Astrophysical Journal. 2021 Sep 29;919(1). 61. https://doi.org/10.3847/1538-4357/ac0f07

Author

Onoue, Masafusa ; Matsuoka, Yoshiki ; Kashikawa, Nobunari ; Strauss, Michael A. ; Iwasawa, Kazushi ; Izumi, Takuma ; Nagao, Tohru ; Asami, Naoko ; Fujimoto, Seiji ; Harikane, Yuichi ; Hashimoto, Takuya ; Imanishi, Masatoshi ; Lee, Chien-Hsiu ; Shibuya, Takatoshi ; Toba, Yoshiki. / Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XIV. A Candidate Type II Quasar at z=6.1292. In: Astrophysical Journal. 2021 ; Vol. 919, No. 1.

Bibtex

@article{eb4c80b7e5504c1d86d63fefbe014990,
title = "Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XIV. A Candidate Type II Quasar at z=6.1292",
abstract = "We present deep Keck/MOSFIRE near-infrared spectroscopy of a strong Ly alpha emitting source at z = 6.1292, HSC J142331.71-001809.1, which was discovered by the SHELLQS program from imaging data of the Subaru Hyper Suprime-Cam (HSC) survey. This source is one of five objects that show narrow (FWHM < 500 km s(-1)) and prominent (Ly alpha > 1044 erg s(-1)) Ly alpha emission lines at absolute 1450 angstrom continuum magnitudes of M-1450 similar to-22 mag. Its rest-frame Ly alpha equivalent width (EW) is 370 +/- 30 angstrom. In the 2 hr Keck/MOSFIRE spectrum in Y band, the high-ionization C IV lambda lambda 1548,1550 doublet emission line was clearly detected with FWHM = 120(-20)(+20) km s(-1) and a total rest-frame EW of 37(-5)(+6) angstrom. We also report the detection of weak continuum emission, and the tentative detection of O III]lambda lambda 1661,1666 in the 4 hr J-band spectrum. Judging from the UV magnitude, line widths, luminosities, and EWs of Ly alpha and C IV, we suggest that this source is a reionization-era analog of classical type-II AGNs, although there is a possibility that it represents a new population of AGN/galaxy composite objects in the early universe. We compare the properties of J1423-0018 to intermediate-redshift type-II AGNs and C IV emitters seen in z = 6-7 galaxy samples. Further observations of other metal emission lines in the rest-frame UV or optical, along with X-ray follow-up observations of the z = 6-7 narrow-line quasars, are needed for more robust diagnostics and to determine their nature.",
keywords = "LY-ALPHA-EMITTERS, DIGITAL SKY SURVEY, ACTIVE GALACTIC NUCLEUS, X-RAY, OPTICAL-PROPERTIES, STAR-FORMATION, RADIO GALAXY, AGN FEEDBACK, BLACK-HOLE, REDSHIFT",
author = "Masafusa Onoue and Yoshiki Matsuoka and Nobunari Kashikawa and Strauss, {Michael A.} and Kazushi Iwasawa and Takuma Izumi and Tohru Nagao and Naoko Asami and Seiji Fujimoto and Yuichi Harikane and Takuya Hashimoto and Masatoshi Imanishi and Chien-Hsiu Lee and Takatoshi Shibuya and Yoshiki Toba",
year = "2021",
month = sep,
day = "29",
doi = "10.3847/1538-4357/ac0f07",
language = "English",
volume = "919",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "Institute of Physics Publishing, Inc",
number = "1",

}

RIS

TY - JOUR

T1 - Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XIV. A Candidate Type II Quasar at z=6.1292

AU - Onoue, Masafusa

AU - Matsuoka, Yoshiki

AU - Kashikawa, Nobunari

AU - Strauss, Michael A.

AU - Iwasawa, Kazushi

AU - Izumi, Takuma

AU - Nagao, Tohru

AU - Asami, Naoko

AU - Fujimoto, Seiji

AU - Harikane, Yuichi

AU - Hashimoto, Takuya

AU - Imanishi, Masatoshi

AU - Lee, Chien-Hsiu

AU - Shibuya, Takatoshi

AU - Toba, Yoshiki

PY - 2021/9/29

Y1 - 2021/9/29

N2 - We present deep Keck/MOSFIRE near-infrared spectroscopy of a strong Ly alpha emitting source at z = 6.1292, HSC J142331.71-001809.1, which was discovered by the SHELLQS program from imaging data of the Subaru Hyper Suprime-Cam (HSC) survey. This source is one of five objects that show narrow (FWHM < 500 km s(-1)) and prominent (Ly alpha > 1044 erg s(-1)) Ly alpha emission lines at absolute 1450 angstrom continuum magnitudes of M-1450 similar to-22 mag. Its rest-frame Ly alpha equivalent width (EW) is 370 +/- 30 angstrom. In the 2 hr Keck/MOSFIRE spectrum in Y band, the high-ionization C IV lambda lambda 1548,1550 doublet emission line was clearly detected with FWHM = 120(-20)(+20) km s(-1) and a total rest-frame EW of 37(-5)(+6) angstrom. We also report the detection of weak continuum emission, and the tentative detection of O III]lambda lambda 1661,1666 in the 4 hr J-band spectrum. Judging from the UV magnitude, line widths, luminosities, and EWs of Ly alpha and C IV, we suggest that this source is a reionization-era analog of classical type-II AGNs, although there is a possibility that it represents a new population of AGN/galaxy composite objects in the early universe. We compare the properties of J1423-0018 to intermediate-redshift type-II AGNs and C IV emitters seen in z = 6-7 galaxy samples. Further observations of other metal emission lines in the rest-frame UV or optical, along with X-ray follow-up observations of the z = 6-7 narrow-line quasars, are needed for more robust diagnostics and to determine their nature.

AB - We present deep Keck/MOSFIRE near-infrared spectroscopy of a strong Ly alpha emitting source at z = 6.1292, HSC J142331.71-001809.1, which was discovered by the SHELLQS program from imaging data of the Subaru Hyper Suprime-Cam (HSC) survey. This source is one of five objects that show narrow (FWHM < 500 km s(-1)) and prominent (Ly alpha > 1044 erg s(-1)) Ly alpha emission lines at absolute 1450 angstrom continuum magnitudes of M-1450 similar to-22 mag. Its rest-frame Ly alpha equivalent width (EW) is 370 +/- 30 angstrom. In the 2 hr Keck/MOSFIRE spectrum in Y band, the high-ionization C IV lambda lambda 1548,1550 doublet emission line was clearly detected with FWHM = 120(-20)(+20) km s(-1) and a total rest-frame EW of 37(-5)(+6) angstrom. We also report the detection of weak continuum emission, and the tentative detection of O III]lambda lambda 1661,1666 in the 4 hr J-band spectrum. Judging from the UV magnitude, line widths, luminosities, and EWs of Ly alpha and C IV, we suggest that this source is a reionization-era analog of classical type-II AGNs, although there is a possibility that it represents a new population of AGN/galaxy composite objects in the early universe. We compare the properties of J1423-0018 to intermediate-redshift type-II AGNs and C IV emitters seen in z = 6-7 galaxy samples. Further observations of other metal emission lines in the rest-frame UV or optical, along with X-ray follow-up observations of the z = 6-7 narrow-line quasars, are needed for more robust diagnostics and to determine their nature.

KW - LY-ALPHA-EMITTERS

KW - DIGITAL SKY SURVEY

KW - ACTIVE GALACTIC NUCLEUS

KW - X-RAY

KW - OPTICAL-PROPERTIES

KW - STAR-FORMATION

KW - RADIO GALAXY

KW - AGN FEEDBACK

KW - BLACK-HOLE

KW - REDSHIFT

U2 - 10.3847/1538-4357/ac0f07

DO - 10.3847/1538-4357/ac0f07

M3 - Journal article

VL - 919

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 61

ER -

ID: 281222667