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Optical spectroscopy of the extremely metal-deficient star-forming galaxy HSC J1631+4426: a test of the strong-line method.

Authors :
Thuan, T X
Guseva, N G
Izotov, Y I
Source :
Monthly Notices of the Royal Astronomical Society: Letters; Oct2022, Vol. 516 Issue 1, pL81-L85, 5p
Publication Year :
2022

Abstract

Recently, Kojima and co-authors have reported a record low oxygen abundance, 12 + logO/H = 6.90 ± 0.03, or 1.6 per cent of solar metallicity, in the low-mass star-forming galaxy HSC J1631 + 4426. This exceptionally low oxygen abundance was obtained by the direct method, using the [O  iii ]λ4363Å emission line. However, using the strong-line method by Izotov et al. (2019b), these authors have derived a significantly higher metallicity 12 + logO/H = 7.175 ± 0.005. To clarify the situation, we have obtained new observations of HSC J1631 + 4426 with the Large Binocular Telescope (LBT)/Multi-Object Dual Spectrograph (MODS). We have derived a higher oxygen abundance, 12 + logO/H = 7.14 ± 0.03, using the direct method, a value similar to the oxygen abundance obtained by the strong-line method. Thus, HSC J1631 + 4426 has a metallicity close to that of the well known blue compact dwarf galaxy I Zw 18. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
17453925
Volume :
516
Issue :
1
Database :
Complementary Index
Journal :
Monthly Notices of the Royal Astronomical Society: Letters
Publication Type :
Academic Journal
Accession number :
159236745
Full Text :
https://doi.org/10.1093/mnrasl/slac095