Exploring the dust content of galactic haloes with Herschel III. NGC 891

Exploring the dust content of galactic haloes with Herschel III. NGC 891
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与赫歇尔三号一起探索银河晕的尘埃含量。

DOI:
10.1093/mnras/staa3583
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发表时间:
2021
影响因子:
4.8
通讯作者:
Engelbracht, C
Engelbracht, C
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yoon, J H;Martin, Crystal L;Veilleux, S;Meléndez, M;Mueller, T;Gordon, K D;Cecil, G;Bland-Hawthorn, J;Engelbracht, C

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我们介绍了用赫歇尔空间天文台和斯皮策空间望远镜对附近的边缘星系NGC 891进行的深远红外观测。这些地图证实了检测到的热辐射从内环星系介质(晕)和空间解决一个尘埃超级气泡和尘埃刺(灯丝)。晕的尘埃温度低于盘的尘埃温度,但在直径为1.8.0 kpc的区域内增加,从盘的一侧垂直延伸至少7.7 kpc,我们称这个区域为超级气泡,因为它与热X射线发射和同步加速器尺度高度的最小值有关。这股外流正在突破厚厚的圆盘,并发展成星系风,这是特别有趣的,因为NGC 891不被认为是一个星暴星系;星星形成率表面密度为0.03 M yr− 1 kpc −2,气体分数,仅在内部圆盘,表明风形成的阈值低于以前的工作。我们的结论是,星星形成的表面密度是足够的超级气泡井喷到晕,但宇宙射线电子可能发挥关键作用,在确定是否这种外流发展成一个喷泉或逃离引力势。尘埃突中的高尘埃-气体比表明,这些物质是通过微晕与NGC 891的圆盘碰撞而被拉出NGC 891的。我们的结论是,NGC 891提供了一个例子,反馈和卫星相互作用的尘埃运输到一个典型的星系晕。
We present deep far-infrared observations of the nearby edge-on galaxy NGC 891 obtained with theHerschel Space Observatoryand theSpitzer Space Telescope. The maps confirm the detection of thermal emission from the inner circumgalactic medium (halo) and spatially resolve a dusty superbubble and a dust spur (filament). The dust temperature of the halo component is lower than that of the disc but increases across a region of diameter ≈8.0 kpc extending at least 7.7 kpc vertically from one side of the disc, a region we call a superbubble because of its association with thermal X-ray emission and a minimum in the synchrotron scale height. This outflow is breaking through the thick disc and developing into a galactic wind, which is of particular interest because NGC 891 is not considered a starburst galaxy; the star formation rate surface density, 0.03 M⊙yr−1kpc−2, and gas fraction, justin the inner disc, indicate the threshold for wind formation is lower than previous work has suggested. We conclude that the star formation surface density is sufficient for superbubble blowout into the halo, but the cosmic ray electrons may play a critical role in determining whether this outflow develops into a fountain or escapes from the gravitational potential. The high dust-to-gas ratio in the dust spur suggests the material was pulled out of NGC 891 through the collision of a minihalo with the disc of NGC 891. We conclude that NGC 891 offers an example of both feedback and satellite interactions transporting dust into the halo of a typical galaxy.
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发表时间: 2020
期刊: The Astrophysical Journal
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DOI: 10.1086/118660
发表时间: 1997-05
期刊: PLoS ONE
影响因子: 3.7
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发表时间: 2011
影响因子: 6.5
作者:
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