Subaru/FOCAS IFU revealed the metallicity gradient of a local extremely metal-poor galaxy
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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 log(10)(M-*/M-circle dot) = 5.8, respectively. The measured metallicity gradient is -0.36 +/- 0.04 dex kpc(-1) corresponding to -0.049 +/- 0.006 dex R-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.
Original language | English |
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Journal | Publications of the Astronomical Society of Japan |
Volume | 73 |
Issue number | 6 |
Pages (from-to) | 1631-1637 |
Number of pages | 7 |
ISSN | 0004-6264 |
DOIs | |
Publication status | Published - 1 Dec 2021 |
- galaxies: abundances, galaxies: dwarf, galaxies: evolution, galaxies: individual (HSC J1631+4426), galaxies: ISM, ABUNDANCE GRADIENTS, MASS-METALLICITY, DWARF GALAXIES, GAS, DISCOVERY, EVOLUTION
Research areas
ID: 289234317