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- Title
Subaru/FOCAS IFU revealed the metallicity gradient of a local extremely metal-poor galaxy.
- Authors
Kashiwagi, Yuri; Inoue, Akio K; Isobe, Yuki; Nakajima, Kimihiko; Ouchi, Masami; Ozaki, Shinobu; Fujimoto, Seiji; Ono, Yoshiaki; Kojima, Takashi
- 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 |$\:R_\mathrm{e}^{-1}$| for the continuum effective radius of R e = 0.14 kpc. Our observation has successfully demonstrated that three-dimensional spectroscopy with 8 m-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.
- Subjects
SUBARU Corp.; STELLAR mass; GALAXIES; SPECTROGRAPHS; SAWLOGS; TELESCOPES
- Publication
Publications of the Astronomical Society of Japan, 2021, Vol 73, Issue 6, p1631
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psab100