The extent of dust in NGC 891 from Herschel/SPIRE images
The extent of dust in NGC 891 from Herschel/SPIRE images
复制标题
Herschel/SPIRE 图像中 NGC 891 中灰尘的程度
DOI：
10.1051/0004-6361/201116772
复制
发表时间：
2011
影响因子：
6.5
通讯作者：
E. Xilouris
中科院分区：
文献类型：
--
作者：
S. Bianchi;E. Xilouris
我们分析了边缘螺旋星系NGC891在250、350和500μm处的赫歇尔/尖顶图像，利用三维辐射传输模型，我们确认了尘埃具有类似于恒星盘的径向下落。尘埃盘在距离中心约12kpc处出现断裂，轮廓变得更加陡峭。在该中断之后，可以在NE侧跟踪高达90%的光盘的发射。对于西南方向，我们确认了之前由红外空间天文台(ISO)探测到的与扩展的、不对称的HI盘有关的尘埃发射。这一发射与从辐射转移拟合到光学图像中推断的大的弥漫尘埃盘略有一致。除了薄的、未分辨的圆盘外，在平面上方没有发现多余的发射。
We analyse Herschel/SPIRE images of the edge-on spiral galaxy NGC 891 at 250, 350, and 500 μm. Using a 3D radiative transfer model we confirm that the dust has radial fall-off similar to the stellar disk. The dust disk shows a break at about 12 kpc from the centre, where the profile becomes steeper. Beyond this break, emission can be traced up to 90% of the optical disk on the NE side. To the SW, we confirm dust emission associated with the extended, asymmetric HI disk, previously detected by the Infrared Space Observatory (ISO).This emission is marginally consistent with the large diffuse dust disk inferred from radiative transfer fits to optical images. No excess emission is found above the plane beyond that of the thin, unresolved, disk.