标题： 活动星系核的红外发射 显示英文标题

标题： IR Emission from AGNs

摘要： 统一的活动星系核（AGN）模型需要在中心引擎周围有一个遮蔽的尘埃环。 早期的理论建模推断出该环的大小可达数百秒差距，但高分辨率红外观测表明，其大小不超过几个秒差距。 当考虑到环的弥散特性时，这一矛盾便得以解决。 紧凑型环可能最好被理解为与从中心吸积盘喷出的风中的尘埃、光学厚度区域相对应。 显示英文摘要

摘要： Unified schemes of active galactic nuclei (AGN) require an obscuring dusty torus around the central engine. Torus sizes of hundreds of parsecs were deduced from early theoretical modeling efforts, but high-resolution IR observations now show that the torus size is no more than a few parsecs. This conflict is resolved when the clumpy nature of the torus is taken into account. The compact torus may be best understood when identified with the dusty, optically thick region of the wind coming off the central accretion disk.