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Absorption by Spinning Dust: A Contaminant for High-redshift 21cm Observations

机译:通过纺丝粉尘吸收:高射频21cm观察的污染物

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Spinning dust grains in front of the bright Galactic synchrotron background can produce a weak absorption signal that could affect measurements of high-redshift 21 cm absorption. At frequencies near 80 MHz where the Experiment to Detect the Global EoR Signature (EDGES) has reported 21 cm absorption at z ≈ 17, absorption could be produced by interstellar nanoparticles with radii a ≈ 50 ? in the cold interstellar medium (ISM), with rotational temperature T ≈ 50 K. Atmospheric aerosols could contribute additional absorption. The strength of the absorption depends on the abundance of such grains and on their dipole moments, which are uncertain. The breadth of the absorption spectrum of spinning dust limits its possible impact on measurement of a relatively narrow 21 cm absorption feature.
机译:在明亮的银河系统同步背景前面的纺丝粉末可以产生弱吸收信号,可能会影响高射频21厘米吸收的测量。 在80 MHz附近的频率下,实验检测全局EOR签名(边缘)已经报道了Z≈17的21厘米,可以通过甲瘤纳米颗粒颗粒纳米粒子的吸收来产生≈50? 在冷星甲介质(ISM)中,具有旋转温度T≈50k.大气气溶胶可能有助于额外的吸收。 吸收的强度取决于这种谷物的丰度和偶极矩,这是不确定的。 纺丝粉尘的吸收光谱的宽度限制了其对测量相对窄的21cm吸收特征的影响。

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