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CHEERS: CHEmical Enrichment Rgs Sample

发布时间:2019-03-25 14:10来源:未知 责任编辑:于莹

报告题目:CHEERS: CHEmical Enrichment Rgs Sample

报 告 人:毛俊捷 博士

报告时间:2019年04月01日 15时00分

报告地点:天文楼212报告厅

报告人:毛俊捷 博士 (SRON Netherland Institute for Space Research,陈阳邀请)
题目:CHEERS: CHEmical Enrichment Rgs Sample
时间:4月1日上午10点
地点:天文楼212报告厅
摘要:The hot X-ray halos of groups and clusters of galaxies are collisionally ionized. Their line-rich spectra show metal enrichment. The elemental abundances in these collisionally ionized media are footprints of time-integrated yields of various stellar populations. Specific abundance patterns have been left prior to and during the evolution of groups and clusters of galaxies. Thanks to the CHEmical Enrichment Rgs Sample (CHEERS) observed with the Reflection Grating Spectrometer (RGS) aboard XMM-Newton, we are able to understand the chemical enrichment of various elements in nearby groups and clusters of galaxies. Low- and intermediate-massive stars in the asymptotic giant branch are the main metal factories of light elements like nitrogen. Massive stars undergo core collapse at the end of their evolution ejecting a large number of alpha-elements (e.g. O, Ne, and Mg). Degenerate stars leading to Type Ia supernovae produce significant amounts of the Fe-peak elements (e.g. Cr, Mn, Fe, and Ni).
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