The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 ≤ z ≤ 5.4

Yiseul Jeon; Myungshin Im; Dohyeong Kim; Yongjung Kim; Hyunsung David Jun; Soojong Pak; Yoon Chan Taak; Giseon Baek; Changsu Choi; Nahyun Choi; Jueun Hong; Minhee Hyun; Tae Geun Ji; Marios Karouzos; Duho Kim; Jae Woo Kim; Ji Hoon Kim; Minjin Kim; Sanghyuk Kim; Hye In Lee; Seong Kook Lee; Won Kee Park; Woojin Park; Yongmin Yoon

doi:10.3847/1538-4365/aa7de5

The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 ≤ z ≤ 5.4

Yiseul Jeon, Myungshin Im, Dohyeong Kim, Yongjung Kim, Hyunsung David Jun, Soojong Pak, Yoon Chan Taak, Giseon Baek, Changsu Choi, Nahyun Choi, Jueun Hong, Minhee Hyun, Tae Geun Ji, Marios Karouzos, Duho Kim, Jae Woo Kim, Ji Hoon Kim, Minjin Kim, Sanghyuk Kim, Hye In LeeSeong Kook Lee, Won Kee Park, Woojin Park, Yongmin Yoon

School of Earth System Sciences

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

14 Scopus citations

Abstract

We present the first results of our survey for high-redshift quasars at 5 ≲ z ≲ 5.7. The search for quasars in this redshift range has been known to be challenging due to the limitations of the filter sets used in previous studies. We conducted a quasar survey for two specific redshift ranges, 4.60 ≤ z ≤ 5.40 and 5.50 ≤ z ≤ 6.05, using multiwavelength data that include observations made with custom-designed filters, is and iz. Using these filters and a new selection technique, we were able to reduce the fraction of interlopers. Through optical spectroscopy, we confirmed six quasars at 4.7 ≤ z ≤ 5.4 with -27.4 < M¹⁴⁵⁰ < -26.4 that recently were discovered independently by another group. We estimated black hole masses and Eddington ratios of four of these quasars from optical and near-infrared spectra, and found that these quasars are undergoing nearly Eddington-limited accretion that is consistent with the rapid growth of supermassive black holes in luminous quasars at z ∼ 5.

Original language	English
Article number	16
Journal	Astrophysical Journal, Supplement Series
Volume	231
Issue number	2
DOIs	https://doi.org/10.3847/1538-4365/aa7de5
State	Published - Aug 2017

Keywords

cosmology: observations
quasars: emission lines
quasars: general
quasars: supermassive black holes
surveys

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Jeon, Y., Im, M., Kim, D., Kim, Y., Jun, H. D., Pak, S., Taak, Y. C., Baek, G., Choi, C., Choi, N., Hong, J., Hyun, M., Ji, T. G., Karouzos, M., Kim, D., Kim, J. W., Kim, J. H., Kim, M., Kim, S., ... Yoon, Y. (2017). The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 ≤ z ≤ 5.4. Astrophysical Journal, Supplement Series, 231(2), Article 16. https://doi.org/10.3847/1538-4365/aa7de5

@article{65a8921b17d14979b3d36841db8da258,

title = "The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 ≤ z ≤ 5.4",

abstract = "We present the first results of our survey for high-redshift quasars at 5 ≲ z ≲ 5.7. The search for quasars in this redshift range has been known to be challenging due to the limitations of the filter sets used in previous studies. We conducted a quasar survey for two specific redshift ranges, 4.60 ≤ z ≤ 5.40 and 5.50 ≤ z ≤ 6.05, using multiwavelength data that include observations made with custom-designed filters, is and iz. Using these filters and a new selection technique, we were able to reduce the fraction of interlopers. Through optical spectroscopy, we confirmed six quasars at 4.7 ≤ z ≤ 5.4 with -27.4 < M1450 < -26.4 that recently were discovered independently by another group. We estimated black hole masses and Eddington ratios of four of these quasars from optical and near-infrared spectra, and found that these quasars are undergoing nearly Eddington-limited accretion that is consistent with the rapid growth of supermassive black holes in luminous quasars at z ∼ 5.",

keywords = "cosmology: observations, quasars: emission lines, quasars: general, quasars: supermassive black holes, surveys",

author = "Yiseul Jeon and Myungshin Im and Dohyeong Kim and Yongjung Kim and Jun, {Hyunsung David} and Soojong Pak and Taak, {Yoon Chan} and Giseon Baek and Changsu Choi and Nahyun Choi and Jueun Hong and Minhee Hyun and Ji, {Tae Geun} and Marios Karouzos and Duho Kim and Kim, {Jae Woo} and Kim, {Ji Hoon} and Minjin Kim and Sanghyuk Kim and Lee, {Hye In} and Lee, {Seong Kook} and Park, {Won Kee} and Woojin Park and Yongmin Yoon",

year = "2017",

month = aug,

doi = "10.3847/1538-4365/aa7de5",

language = "English",

volume = "231",

journal = "Astrophysical Journal, Supplement Series",

issn = "0067-0049",

publisher = "American Astronomical Society",

number = "2",

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Jeon, Y, Im, M, Kim, D, Kim, Y, Jun, HD, Pak, S, Taak, YC, Baek, G, Choi, C, Choi, N, Hong, J, Hyun, M, Ji, TG, Karouzos, M, Kim, D, Kim, JW, Kim, JH, Kim, M, Kim, S, Lee, HI, Lee, SK, Park, WK, Park, W & Yoon, Y 2017, 'The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 ≤ z ≤ 5.4', Astrophysical Journal, Supplement Series, vol. 231, no. 2, 16. https://doi.org/10.3847/1538-4365/aa7de5

TY - JOUR

T1 - The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 ≤ z ≤ 5.4

AU - Jeon, Yiseul

AU - Im, Myungshin

AU - Kim, Dohyeong

AU - Kim, Yongjung

AU - Jun, Hyunsung David

AU - Pak, Soojong

AU - Taak, Yoon Chan

AU - Baek, Giseon

AU - Choi, Changsu

AU - Choi, Nahyun

AU - Hong, Jueun

AU - Hyun, Minhee

AU - Ji, Tae Geun

AU - Karouzos, Marios

AU - Kim, Duho

AU - Kim, Jae Woo

AU - Kim, Ji Hoon

AU - Kim, Minjin

AU - Kim, Sanghyuk

AU - Lee, Hye In

AU - Lee, Seong Kook

AU - Park, Won Kee

AU - Park, Woojin

AU - Yoon, Yongmin

PY - 2017/8

Y1 - 2017/8

N2 - We present the first results of our survey for high-redshift quasars at 5 ≲ z ≲ 5.7. The search for quasars in this redshift range has been known to be challenging due to the limitations of the filter sets used in previous studies. We conducted a quasar survey for two specific redshift ranges, 4.60 ≤ z ≤ 5.40 and 5.50 ≤ z ≤ 6.05, using multiwavelength data that include observations made with custom-designed filters, is and iz. Using these filters and a new selection technique, we were able to reduce the fraction of interlopers. Through optical spectroscopy, we confirmed six quasars at 4.7 ≤ z ≤ 5.4 with -27.4 < M1450 < -26.4 that recently were discovered independently by another group. We estimated black hole masses and Eddington ratios of four of these quasars from optical and near-infrared spectra, and found that these quasars are undergoing nearly Eddington-limited accretion that is consistent with the rapid growth of supermassive black holes in luminous quasars at z ∼ 5.

AB - We present the first results of our survey for high-redshift quasars at 5 ≲ z ≲ 5.7. The search for quasars in this redshift range has been known to be challenging due to the limitations of the filter sets used in previous studies. We conducted a quasar survey for two specific redshift ranges, 4.60 ≤ z ≤ 5.40 and 5.50 ≤ z ≤ 6.05, using multiwavelength data that include observations made with custom-designed filters, is and iz. Using these filters and a new selection technique, we were able to reduce the fraction of interlopers. Through optical spectroscopy, we confirmed six quasars at 4.7 ≤ z ≤ 5.4 with -27.4 < M1450 < -26.4 that recently were discovered independently by another group. We estimated black hole masses and Eddington ratios of four of these quasars from optical and near-infrared spectra, and found that these quasars are undergoing nearly Eddington-limited accretion that is consistent with the rapid growth of supermassive black holes in luminous quasars at z ∼ 5.

KW - cosmology: observations

KW - quasars: emission lines

KW - quasars: general

KW - quasars: supermassive black holes

KW - surveys

UR - http://www.scopus.com/inward/record.url?scp=85028312005&partnerID=8YFLogxK

U2 - 10.3847/1538-4365/aa7de5

DO - 10.3847/1538-4365/aa7de5

M3 - Review article

AN - SCOPUS:85028312005

SN - 0067-0049

VL - 231

JO - Astrophysical Journal, Supplement Series

JF - Astrophysical Journal, Supplement Series

IS - 2

M1 - 16

ER -

The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 ≤ z ≤ 5.4

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Keywords

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