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Subaru/FOCAS IFU revealed the metallicity gradient of a local extremely metal-poor galaxy.
- Source :
-
Publications of the Astronomical Society of Japan . Dec2021, Vol. 73 Issue 6, p1631-1637. 7p. - Publication Year :
- 2021
-
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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *STELLAR mass
*GALAXIES
*SPECTROGRAPHS
*SAWLOGS
*TELESCOPES
Subjects
Details
- Language :
- English
- ISSN :
- 00046264
- Volume :
- 73
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Publications of the Astronomical Society of Japan
- Publication Type :
- Academic Journal
- Accession number :
- 153984797
- Full Text :
- https://doi.org/10.1093/pasj/psab100