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Infrared emission from intracluster dust grains and constraints on dust properties

机译：团簇内尘粒的红外辐射及其对粉尘特性的限制

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摘要

For 117 clusters of galaxies, we explore the detectability of intracluster dust grains by current and future infrared facilities, taking into account both collisional heating and sputtering of grains by the ambient plasma. If the dust grains are injected into intergalactic space with the amount and size comparable to the Galactic values, the dust-togas ratio is typically 10(-6) and the mean dust temperature is similar to 30 K near the cluster center. The predicted infrared intensities lie marginally above the detection thresholds for Spitzer Space Telescope, ASTRO-F, Herschel, and SPICA missions. For some nearby clusters, such as Perseus, A 357 1, A 2319, A 3112, and A 2204, good detections of intracluster dust signals are expected in the 70 mu m band. Given rather tight constraints on the dust temperature from the observed electron density and the temperature, the dust mass can be inferred directly from infrared observations. Further constraints on the size distribution will be obtained once multi-band data are available. They will definitely provide a powerful probe of the dust injection processes and dust-gas interactions in intergalactic space.
机译：对于117个星系团，我们研究了当前和未来的红外设施对簇内尘粒的可检测性，同时考虑了碰撞加热和环境等离子体对晶粒的溅射。如果将尘粒以与银河系数值相当的数量和大小注入星际空间，则尘/气比通常为10（-6），并且在团簇中心附近的平均尘埃温度类似于30K。预测的红外强度略高于Spitzer太空望远镜，ASTRO-F，Herschel和SPICA任务的检测阈值。对于一些邻近的星团，例如Perseus，A 357 1，A 2319，A 3112和A 2204，预期在70微米波段内可以很好地检测到集群内尘埃信号。从观测到的电子密度和温度对粉尘温度给出相当严格的约束，可以直接从红外观测中推断出粉尘质量。一旦多频带数据可用，将获得对大小分布的进一步限制。它们无疑将为星际空间中的尘埃喷射过程和尘埃气体相互作用提供有力的探索。

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