Brilliant Pebbles：一种探测超大星际颗粒的方法
Brilliant Pebbles: A Method for Detection of Very Large Interstellar Grains
摘要：
波长λ ~1 μ m的光子与半径a_p ~ 1 mm的尘埃颗粒（“卵石”）相互作用时，在很大程度上在一个小的特征衍射角θ_s ~ λ/a_p ~ 100”范围内发生正向散射。虽然毫米大小的尘埃颗粒对星际介质的视觉消光的贡献可以忽略不计，但它们在散射光中产生的信号可能是可检测的，特别是对于可变源。小角度散射光的观测允许直接测量大颗粒群;可变源也可以产生星际介质质量分布的断层扫描信息。探测明亮卵石晕的能力需要仔细了解仪器PSF。
英文摘要：
A photon of wavelength lambda ~1 micron interacting with a dust grain of radius a_p ~ 1 mm (a "pebble") undergoes scattering in the forward direction, largely within a small characteristic diffraction angle theta_s ~ lambda/a_p ~ 100". Though mm-size dust grains contribute negligibly to the interstellar medium's visual extinction, the signal they produce in scattered light may be detectable, especially for variable sources. Observations of light scattered at small angles allows for the direct measurement of the large grain population; variable sources can also yield tomographic information of the interstellar medium's mass distribution. The ability to detect brilliant pebble halos require a careful understanding of the instrument PSF.
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