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The local and global properties of different types of supernova host galaxies

Research in Astronomy and Astrophysics 2020年第11期20卷 169-181页

作者： Li Zhou Yan-Chun Liang Jun-Qiang Ge Yi-Nan Zhu Xu Shao Hong Wu Wei-Bin Shi Li-Cai Deng Department of Astronomy School of Physics and AstronomySun Yat-sen UniversityZhuhai 519082China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment School of Space Science and PhysicsShandong University at WeihaiWeihai 264209China

By using Data Analysis Pipeline(DAP)products of Mapping Nearby galaxies at Apache Point Observatory(MaNGA),which are publicly available from the SDSS Data Release 15,we analyze the local properties at the SN explosion sites and global properties of different types of SN host galaxies to explore the explosion environments of different types of *** our sample,there are 67 SN host galaxies in the field of view of MaNGA,including 32 Type Ia,29 core collapse SNe(CCSNe),1 superluminous SN(SLSN),1 Type I and 4 unclassified type of SNe,with which we can apply the K-S test for analysis and derive statistically robust *** to the limited sample size,we could not remove the mass dependence in this work,which is likely the true driver of the trends for the properties presented in this *** global star formation rate(SFR)and EW(H)for SN Ia hosts are slightly lower than those for CCSN hosts on *** Ia host galaxies are0.3 dex more massive than CCSN hosts,which implies that the number ratio of CCSNe to Type Ia SNe will decrease with increasing stellar mass of host *** stellar population age of SN Ia host galaxies is older than that of CCSN hosts on *** is no significant difference between different types of SN hosts for some properties,including local SFR density(SFR),and local and global gas-phase oxygen *** most galaxies in our sample,the global gas-phase oxygen abundance estimated from the integrated spectra of SN hosts can represent the local gas-phase oxygen abundance at the SN explosion sites with small bias.

关键词： galaxies abundances galaxies general galaxies stellar content supernovae general

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Observational evidence for the evolution of nuclear metallicity and star formation rate with the merger stage

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Research in Astronomy and Astrophysics 2016年第7期16卷 113-124页

作者： Rui Guo Cai-Na Hao Xiao-Yang Xia Peng Wei Xin Guo National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100012China University of Chinese Academy of Sciences Beijing 100049China Tianjin Astrophysics Center Tianjin Normal UniversityTianjin 300387China School of Astronomy and Space Science Nanjing UniversityNanjing 210093China

We investigate the evolution of nuclear gas-phase oxygen abundance and star formation rate（SFR） of local far-infrared selected star-forming galaxies along the merger sequence, as traced by their optical morphologies. The sample was drawn from a cross-correlation analysis of the IRAS Point Source Catalog Redshift Survey and 1 Jy ultraluminous infrared galaxy sample with the Sloan Digital Sky Survey Data Release 7 database. The investigation is done by comparing our sample to a control sample matched in the normalized redshift distribution in two diagnostics, which are the nuclear gas-phase metallicity *** mass and the nuclear SFR vs. stellar mass diagrams. galaxies with different morphological types show different mass-metallicity relations（MZRs）. Compared to the MZR defined by the control sample,isolated spirals have comparable metallicities with the control sample at a given stellar mass. Spirals in pairs and interacting galaxies with projected separations of rp 〉 20 kpc show a mild metallicity dilution of0.02–0.03 dex. Interacting galaxies with rp 〈 20 kpc, pre-mergers and advanced mergers are underabundant by～0.06,～0.05 and～0.04 dex, respectively. This shows an evolutionary trend that the metallicity is increasingly depressed as the merging proceeds and it is diluted most dramatically when two galaxies are closely interacting. Afterwards, the interstellar medium（ISM） is enriched when the galaxies *** is the first time that such ISM enrichment at the final coalescence stage has been observed, which demonstrates the importance of supernova explosions in affecting the nuclear metallicity. Moreover, the central SFR enhancement relative to the control sample evolves simultaneously with the nuclear gas-phase oxygen abundance. Our results support the predictions from numerical simulations.

关键词： galaxies abundances galaxies evolution galaxies interactions galaxies starburst galaxies star formation infrared galaxies

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