首页|HI in High Gas-phase Metallicity Dwarf Galaxy WISEA J230615.06+143927.9

HI in High Gas-phase Metallicity Dwarf Galaxy WISEA J230615.06+143927.9

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We present resolved Giant Metrewave Radio Telescope HI observations of the high gas-phase metallicity dwarf galaxy WISEA J230615.06+143927.9(z=0.005)(hereafter J2306)and investigate whether it could be a Tidal Dwarf Galaxy(TDG)candidate.TDGs are observed to have higher metallicities than normal dwarfs.J2306 has an unusual combination of a blue g-r color of 0.23 mag,irregular optical morphology and high-metallicity(12+log(O/H)=8.68±0.14),making it an interesting galaxy to study in more detail.We find J2306 to be an HI rich galaxy with a large extended,unperturbed rotating HI disk.Using our HI data we estimated its dynamical mass and found the galaxy to be dark matter(DM)dominated within its HI radius.The quantity of DM,inferred from its dynamical mass,appears to rule out J2306 as an evolved TDG.A wide area environment search reveals J2306 to be isolated from any larger galaxies which could have been the source of its high gas metallicity.Additionally,the HI morphology and kinematics of the galaxy show no indication of a recent merger to explain the high-metallicity.Further detailed optical spectroscopic observations of J2306 might provide an answer to how a seemingly ordinary irregular dwarf galaxy achieved such a high level of metal enrichment.

galaxies:abundancesgalaxies:dwarfgalaxies:irregularradio lines:galaxiesradio lines:ISM

Yan Guo、C.Sengupta、T.C.Scott、P.Lagos、Y.Luo

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Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China

School of Astronomy and Space Sciences,University of Science and Technology of China,Hefei 230026,China

Institute of Astrophysics and Space Sciences(IA Porto),Rua das Estrelas,4150-762,Porto,Portugal

National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research国家重点研发计划国家自然科学基金national funds through Funda??o para a Ciência e a Tecnol(FCT)national funds through Funda??o para a Ciência e a Tecnol(FCT)Centro de Astrofísica da Universidade do Porto(CAUP)

2022SKA013010012041306contract DL57/2016/CP1364/CT0010DL57/2016/CP1364/CT0009

2024

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子:0.406
ISSN:1674-4527
年,卷(期):2024.24(1)
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