Subaru/FOCAS IFU revealed the metallicity gradient of a local extremely metal-poor galaxy
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Subaru/FOCAS IFU revealed the metallicity gradient of a local extremely metal-poor galaxy. / Kashiwagi, Yuri; Inoue, Akio K.; Isobe, Yuki; Nakajima, Kimihiko; Ouchi, Masami; Ozaki, Shinobu; Fujimoto, Seiji; Ono, Yoshiaki; Kojima, Takashi.
I: Publications of the Astronomical Society of Japan, Bind 73, Nr. 6, 01.12.2021, s. 1631-1637.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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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 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.
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 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.
KW - galaxies: abundances
KW - galaxies: dwarf
KW - galaxies: evolution
KW - galaxies: individual (HSC J1631+4426)
KW - galaxies: ISM
KW - ABUNDANCE GRADIENTS
KW - MASS-METALLICITY
KW - DWARF GALAXIES
KW - GAS
KW - DISCOVERY
KW - EVOLUTION
U2 - 10.1093/pasj/psab100
DO - 10.1093/pasj/psab100
M3 - Journal article
VL - 73
SP - 1631
EP - 1637
JO - Publication of the Astronomical Society of Japan
JF - Publication of the Astronomical Society of Japan
SN - 0004-6264
IS - 6
ER -
ID: 289234317