Probing the cold magnetised Universe with SPICA-POL (B-BOP)
Probing the cold magnetised Universe with SPICA-POL (B-BOP)
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DOI：
10.1017/pasa.2019.20
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发表时间：
2019-05
影响因子：
6.3
通讯作者：
P. Andre';A. Hughes;V. Guillet;F. Boulanger;A. Bracco;E. Ntormousi;D. Arzoumanian;A. Maury
中科院分区：
文献类型：
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作者：
P. Andre';A. Hughes;V. Guillet;F. Boulanger;A. Bracco;E. Ntormousi;D. Arzoumanian;A. Maury
用于宇宙学和天体物理学的空间红外望远镜（SPICA）是最近预选用于“A阶段”概念研究的低温红外空间望远镜，是欧洲航天局（ESA）第五次中等（M5）使命的三个剩余候选者之一，预计将包括一个远红外偏振成像仪[SPICA-POL，现在称为B-场与测辐射计和偏振器（B-BOP）]，这将提供一个独特的机会来解决我们对附近冷磁化宇宙的理解中的主要问题。本文概述了B-BOP的主要科学驱动因素，包括我们银河系和附近星系中冷星际介质（ISM）的高动态范围偏振成像。由于冷却望远镜，B-BOP将提供宽视场100-350 $\mu$m的斯托克斯Q和U的线性偏振尘埃排放图像，其分辨率，信噪比，强度和空间动态范围与冷ISM的赫歇尔图像（斯托克斯I）的总强度相当。B-BOP 200 $\mu$m图像的分辨率也将比普朗克偏振数据高出30倍。这将使B-BOP成为一种独特的工具，用于表征磁化ISM的统计特性，并探测磁场在星际尘埃分子细丝网的形成和演化中的作用，这些尘埃分子细丝在我们的银河系中产生了大多数恒星。B-BOP也将是一个强大的工具，用于研究附近星系的磁性和测试银河发电机模型，限制尘埃颗粒排列的物理学，告知宇宙射线与分子云的相互作用问题，追踪原行星盘内层的磁场，并监测嵌入的原恒星中的吸积爆发。
Abstract Space Infrared Telescope for Cosmology and Astrophysics (SPICA), the cryogenic infrared space telescope recently pre-selected for a ‘Phase A’ concept study as one of the three remaining candidates for European Space Agency (ESA's) fifth medium class (M5) mission, is foreseen to include a far-infrared polarimetric imager [SPICA-POL, now called B-fields with BOlometers and Polarizers (B-BOP)], which would offer a unique opportunity to resolve major issues in our understanding of the nearby, cold magnetised Universe. This paper presents an overview of the main science drivers for B-BOP, including high dynamic range polarimetric imaging of the cold interstellar medium (ISM) in both our Milky Way and nearby galaxies. Thanks to a cooled telescope, B-BOP will deliver wide-field 100–350 $\mu$m images of linearly polarised dust emission in Stokes Q and U with a resolution, signal-to-noise ratio, and both intensity and spatial dynamic ranges comparable to those achieved by Herschel images of the cold ISM in total intensity (Stokes I). The B-BOP 200 $\mu$m images will also have a factor $\sim $30 higher resolution than Planck polarisation data. This will make B-BOP a unique tool for characterising the statistical properties of the magnetised ISM and probing the role of magnetic fields in the formation and evolution of the interstellar web of dusty molecular filaments giving birth to most stars in our Galaxy. B-BOP will also be a powerful instrument for studying the magnetism of nearby galaxies and testing Galactic dynamo models, constraining the physics of dust grain alignment, informing the problem of the interaction of cosmic rays with molecular clouds, tracing magnetic fields in the inner layers of protoplanetary disks, and monitoring accretion bursts in embedded protostars.