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

^*Corresponding author for this work

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

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.

Original language	English
Pages (from-to)	1631-1637
Number of pages	7
Journal	Publications of the Astronomical Society of Japan
Volume	73
Issue number	6
DOIs	https://doi.org/10.1093/pasj/psab100
Publication status	Published - 2021 Dec 1

Keywords

galaxies: ISM
galaxies: abundances
galaxies: dwarf
galaxies: evolution
galaxies: individual (HSC J1631+4426)

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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@article{adf1849ca2284f4da6664d0ae495189f,

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",

pages = "1631--1637",

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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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DO - 10.1093/pasj/psab100

M3 - Article

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SN - 0004-6264

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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

Abstract

Keywords

ASJC Scopus subject areas

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