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

研究成果: Article査読

抄録

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
73
6
DOI
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

フィンガープリント

「Subaru/FOCAS IFU revealed the metallicity gradient of a local extremely metal-poor galaxy」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル