标题： 由赫歇尔PACS和SPIRE成像的β Pictoris盘面 显示英文标题

标题： The β Pictoris disk imaged by Herschel PACS and SPIRE

摘要： 我们获得了围绕A5V型恒星{\beta }Pic的尘埃盘热辐射的赫歇尔空间局（Herschel）PACS和SPIRE图像。该盘在PACS的70、100和160 {\mu }米波段滤光片中被很好地解析。在70至160 {\mu }米波段之间的表面亮度剖面显示盘内没有显著的不对称性，并且有90%的可能性70至160 {\mu }米波段的发射源自距离恒星不到200天文单位的区域。 尽管只是勉强解析了尘埃盘，但通过SPIRE 250-500 {\mu }米波段滤光片获得的地图提供了全盘测光，填补了之前无法触及的几个倍频程的连续谱能量分布（SED）空白。 较小的远红外光谱指数（{\beta } = 0.34）表明内盘（<200AU）中的颗粒大小分布与局部碰撞平衡不一致。颗粒大小分布要么是由非平衡效应所修改，要么表现出波动模式，这是由辐射压力移除的冲击体数量不足引起的。 显示英文摘要

摘要： We obtained Herschel PACS and SPIRE images of the thermal emission of the debris disk around the A5V star {\beta} Pic. The disk is well resolved in the PACS filters at 70, 100, and 160 {\mu}m. The surface brightness profiles between 70 and 160 {\mu}m show no significant asymmetries along the disk, and are compatible with 90% of the emission between 70 and 160 {\mu}m originating in a region closer than 200 AU to the star. Although only marginally resolving the debris disk, the maps obtained in the SPIRE 250 - 500 {\mu}m filters provide full-disk photometry, completing the SED over a few octaves in wavelength that had been previously inaccessible. The small far-infrared spectral index ({\beta} = 0.34) indicates that the grain size distribution in the inner disk (<200AU) is inconsistent with a local collisional equilibrium. The size distribution is either modified by non-equilibrium effects, or exhibits a wavy pattern, caused by an under-abundance of impactors which have been removed by radiation pressure.