092017

MACS J1931.8-2634 is a star-forming galaxy cluster at zvirgul0.35. Thearchival Chandra CCD spectra suggest a rather low level of metallicity inthe intracluster media out to virgul400 kpc. No other metal abundances weremeasured with the CCD data. AGN bubbles might explain the observed abundancebut it is unclear whether dust plays an essential role. Here we propose toobserve this target using mainly RGS with a total exposure of 188 ks.We will accurately measure the metal abundances of O Ne and Fe. Thisenables us to verify whether metals in the cluster core are locked into dustand moved away towards the cluster outskirt. [truncated! Please see actual data for full text]

MACS J1931.8-2634是一个红移z=0.35的恒星形成星系团。存档的钱德拉（Chandra）CCD光谱显示，其星系团内介质（intracluster medium, ICM）在延伸至400千秒差距的范围内金属丰度偏低。该CCD数据未能测得其余金属丰度。活动星系核（Active Galactic Nucleus, AGN）气泡或可解释观测到的丰度分布，但目前尚不清楚尘埃是否发挥了关键作用。本研究拟主要利用反射光栅光谱仪（Reflection Grating Spectrometer, RGS）对该目标开展观测，总曝光时长为188千秒（ks）。我们将精确测量氧（O）、氖（Ne）与铁（Fe）的金属丰度，以此验证星系团核心中的金属是否被锁定于尘埃之中，并被迁移至星系团外围区域。[内容已截断，请查阅完整原始数据以获取全文]