Subaru/FOCAS IFU revealed the metallicity gradient of a local extremely metal-poor galaxy

Yuri Kashiwagi; Akio K. Inoue; Yuki Isobe; Kimihiko Nakajima; Masami Ouchi; Shinobu Ozaki; Seiji Fujimoto; Yoshiaki Ono; Takashi Kojima

doi:10.1093/pasj/psab100

Subaru/FOCAS IFU revealed the metallicity gradient of a local extremely metal-poor galaxy

Yuri Kashiwagi^*, Akio K. Inoue, Yuki Isobe, Kimihiko Nakajima, Masami Ouchi, Shinobu Ozaki, Seiji Fujimoto, Yoshiaki Ono, Takashi Kojima

^*この研究の対応する著者

先進理工学部

研究成果: Article › 査読

2 被引用数 (Scopus)

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We present the first measurement of the metallicity gradient in extremely metal-poor galaxies (EMPGs). With Subaru/Faint Object Camera And Spectrograph (FOCAS) Integral Field Unit (IFU), we have observed a nearby, low-mass EMPG, HSC J1631+4426, whose oxygen abundance and stellar mass are known to be 12 + log (O/H) = 6.9 and log10(M∗/M⊙) = 5.8, respectively. The measured metallicity gradient is -0.36 ± 0.04 dex kpc-1 corresponding to -0.049 ± 0.006 dex R-1e for the continuum effective radius of Re = 0.14 kpc. Our observation has successfully demonstrated that threedimensional spectroscopy with 8m-class telescopes is powerful enough to reveal the metallicity distribution in local EMPGs, providing precious information on the baryon cycle in local analogs of primordial galaxies in the early Universe.

本文言語	English
ページ（範囲）	1631-1637
ページ数	7
ジャーナル	Publications of the Astronomical Society of Japan
巻	73
号	6
DOI	https://doi.org/10.1093/pasj/psab100
出版ステータス	Published - 2021 12月 1

ASJC Scopus subject areas

天文学と天体物理学
宇宙惑星科学

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10.1093/pasj/psab100

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title = "Subaru/FOCAS IFU revealed the metallicity gradient of a local extremely metal-poor galaxy",

abstract = "We present the first measurement of the metallicity gradient in extremely metal-poor galaxies (EMPGs). With Subaru/Faint Object Camera And Spectrograph (FOCAS) Integral Field Unit (IFU), we have observed a nearby, low-mass EMPG, HSC J1631+4426, whose oxygen abundance and stellar mass are known to be 12 + log (O/H) = 6.9 and log10(M∗/M⊙) = 5.8, respectively. The measured metallicity gradient is -0.36 ± 0.04 dex kpc-1 corresponding to -0.049 ± 0.006 dex R-1e for the continuum effective radius of Re = 0.14 kpc. Our observation has successfully demonstrated that threedimensional spectroscopy with 8m-class telescopes is powerful enough to reveal the metallicity distribution in local EMPGs, providing precious information on the baryon cycle in local analogs of primordial galaxies in the early Universe.",

keywords = "galaxies: ISM, galaxies: abundances, galaxies: dwarf, galaxies: evolution, galaxies: individual (HSC J1631+4426)",

author = "Yuri Kashiwagi and Inoue, {Akio K.} and Yuki Isobe and Kimihiko Nakajima and Masami Ouchi and Shinobu Ozaki and Seiji Fujimoto and Yoshiaki Ono and Takashi Kojima",

note = "Publisher Copyright: {\textcopyright} 2021 The Author(s) 2021.",

year = "2021",

month = dec,

day = "1",

doi = "10.1093/pasj/psab100",

language = "English",

volume = "73",

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TY - JOUR

T1 - Subaru/FOCAS IFU revealed the metallicity gradient of a local extremely metal-poor galaxy

AU - Kashiwagi, Yuri

AU - Inoue, Akio K.

AU - Isobe, Yuki

AU - Nakajima, Kimihiko

AU - Ouchi, Masami

AU - Ozaki, Shinobu

AU - Fujimoto, Seiji

AU - Ono, Yoshiaki

AU - Kojima, Takashi

PY - 2021/12/1

Y1 - 2021/12/1

N2 - We present the first measurement of the metallicity gradient in extremely metal-poor galaxies (EMPGs). With Subaru/Faint Object Camera And Spectrograph (FOCAS) Integral Field Unit (IFU), we have observed a nearby, low-mass EMPG, HSC J1631+4426, whose oxygen abundance and stellar mass are known to be 12 + log (O/H) = 6.9 and log10(M∗/M⊙) = 5.8, respectively. The measured metallicity gradient is -0.36 ± 0.04 dex kpc-1 corresponding to -0.049 ± 0.006 dex R-1e for the continuum effective radius of Re = 0.14 kpc. Our observation has successfully demonstrated that threedimensional spectroscopy with 8m-class telescopes is powerful enough to reveal the metallicity distribution in local EMPGs, providing precious information on the baryon cycle in local analogs of primordial galaxies in the early Universe.

AB - We present the first measurement of the metallicity gradient in extremely metal-poor galaxies (EMPGs). With Subaru/Faint Object Camera And Spectrograph (FOCAS) Integral Field Unit (IFU), we have observed a nearby, low-mass EMPG, HSC J1631+4426, whose oxygen abundance and stellar mass are known to be 12 + log (O/H) = 6.9 and log10(M∗/M⊙) = 5.8, respectively. The measured metallicity gradient is -0.36 ± 0.04 dex kpc-1 corresponding to -0.049 ± 0.006 dex R-1e for the continuum effective radius of Re = 0.14 kpc. Our observation has successfully demonstrated that threedimensional spectroscopy with 8m-class telescopes is powerful enough to reveal the metallicity distribution in local EMPGs, providing precious information on the baryon cycle in local analogs of primordial galaxies in the early Universe.

KW - galaxies: ISM

KW - galaxies: abundances

KW - galaxies: dwarf

KW - galaxies: evolution

KW - galaxies: individual (HSC J1631+4426)

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U2 - 10.1093/pasj/psab100

DO - 10.1093/pasj/psab100

M3 - Article

AN - SCOPUS:85122470323

SN - 0004-6264

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SP - 1631

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JO - Publications of the Astronomical Society of Japan

JF - Publications of the Astronomical Society of Japan

IS - 6

ER -

Subaru/FOCAS IFU revealed the metallicity gradient of a local extremely metal-poor galaxy

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