Complete Spectral Mapping of the Sub-Millimetre Sunyaev-Zel.dovich Effect in Galaxy Clusters.

We propose to measure relativistic corrections to theSunyaevZel.dovich effect (rSZ) in two clusters of galaxies withSPIREFTS, providing measurements of the intracluster medium (ICM)temperature with virgul30 arcsec spatial resolution. For the first time,these measurements will enable: 1) unambiguous, high significancemeasurement of the rSZ correction, and 2) precise determination of thetemperature substructure of extremely hot clusters. Both measurementsare technically feasible with SPIREFTS and are inaccessible in anyother way. The value our proposed observations for demonstrating theability to measure the temperature of ICM substructures in massive,complex clusters is enormous, both for cosmological applications(i.e. a precise and unbiased determination of the total mass ofclusters) and for astrophysical applications (untangling the complexatmosphere of clusters using SZ). These measurements will prove thatmeasurements of the rSZ correction can enable important new studies ofcluster physics and the fleeting opportunity to make them should notbe missed. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]

本研究提议采用SPIREFTS对两个星系团中的相对论性修正Sunyaev-Zel'dovich效应（rSZ）进行测量，以实现具有0.3弧秒空间分辨率的星系团内部介质（ICM）温度的测定。此举尚属首次，将为以下两方面提供可能：1）对rSZ修正进行清晰且高显著性测量；2）精确确定极端高温星系团的温度亚结构。两项测量在技术层面上均可行，且SPIREFTS是唯一可行途径。本观测提案对于展示测量庞大且复杂星系团中ICM亚结构温度的能力具有重要意义，这不仅对宇宙学应用（即对星系团总质量的精确和无偏估计）具有价值，而且对天体物理学应用（利用SZ效应解开星系团复杂大气层）亦至关重要。这些测量将证实rSZ修正的测量能够开启对星系物理学的深入研究，而抓住这一稍纵即逝的机会不容忽视。有关完整内容，请参阅实际数据。[完整内容请参阅实际数据]