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arXiv 2408.08026astro-ph.GA
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NGC 891及其环星系介质的JWST MIRI与NIRCam观测

JWST MIRI and NIRCam observations of NGC 891 and its circumgalactic medium

Jérémy Chastenet, Ilse De Looze, Monica Relaño, Daniel A. Dale, Thomas G. Williams, Simone Bianchi, Emmanuel M. Xilouris, Maarten Baes, Alberto D. Bolatto, Mart… 展开作者

Jérémy Chastenet, Ilse De Looze, Monica Relaño, Daniel A. Dale, Thomas G. Williams, Simone Bianchi, Emmanuel M. Xilouris, Maarten Baes, Alberto D. Bolatto, Martha L. Boyer, Viviana Casasola, Christopher J. R. Clark, Filippo Fraternali, Jacopo Fritz, Frédéric Galliano, Simon C. O. Glover, Karl D. Gordon, Hiroyuki Hirashita, Robert Kennicutt, Kentaro Nagamine, Florian Kirchschlager, Ralf S. Klessen, Eric W. Koch, Rebecca C. Levy, Lewis McCallum, Suzanne C. Madden, Anna F. McLeod, Sharon E. Meidt, Aleksandr V. Mosenkov, Helena M. Richie, Amélie Saintonge, Karin M. Sandstrom, Evan E. Schneider, Evgenia E. Sivkova, J. D. T. Smith, Matthew W. L. Smith, Arjen van der Wel, Stefanie Walch, Fabian Walter, Kenneth Wood

AI总结:

本文利用JWST的NIRCam和MIRI对侧向星系NGC 891进行观测,首次在距盘面约4 kpc的环星系介质中探测到丝状、弧状和超级气泡形态的尘埃发射,揭示星系风驱动的尘埃输运与重子循环机制。

摘要:

我们展示了邻近的原型侧向旋涡星系NGC 891的新JWST观测结果。利用NIRCam的F150W和F277W滤光片观测了盘面的北半部分。在F150W图像的中平面处清晰可见吸收特征,以及垂直的尘埃羽状结构,这些结构与光学波段所见的结构非常相似。利用MIRI F770W以12 pc的尺度绘制了低层环星系介质(CGM)中约10×3 kpc²的区域。得益于JWST的灵敏度和分辨率,我们探测到从盘面向外延伸至约4 kpc处的尘埃发射,其形态包括丝状结构、弧状结构和超级气泡。其中一些丝状结构可以追溯至近期有恒星形成活动的区域,表明反馈驱动的星系风在调节重子物质循环中发挥着重要作用。在这些高度上存在尘埃引发了对相关输运机制的疑问,并表明小尘埃颗粒在被盘-晕界面处的星系风抛射后能够存活数千万年。我们提出了几种可以解释这种发射的情景:尘埃颗粒可能被屏蔽在从星系盘抛出的冷而致密云团的外层中,和/或发射来自这些冷团块周围的混合层,在那里来自热气体的物质能够冷却并与这些冷云团混合。这组初步数据和即将进行的光谱观测将非常有助于理解尘埃颗粒在高能环境中的存活情况,以及它们对星系中平面重子物质再循环的贡献。

英文摘要:

We present new JWST observations of the nearby, prototypical edge-on, spiral galaxy NGC 891. The northern half of the disk was observed with NIRCam in its F150W and F277W filters. Absorption is clearly visible in the mid-plane of the F150W image, along with vertical dusty plumes that closely resemble the ones seen in the optical. A $\sim 10 \times 3~{\rm kpc}^2$ area of the lower circumgalactic medium (CGM) was mapped with MIRI F770W at 12 pc scales. Thanks to the sensitivity and resolution of JWST, we detect dust emission out to $\sim 4$ kpc from the disk, in the form of filaments, arcs, and super-bubbles. Some of these filaments can be traced back to regions with recent star formation activity, suggesting that feedback-driven galactic winds play an important role in regulating baryonic cycling. The presence of dust at these altitudes raises questions about the transport mechanisms at play and suggests that small dust grains are able to survive for several tens of million years after having been ejected by galactic winds in the disk-halo interface. We lay out several scenarios that could explain this emission: dust grains may be shielded in the outer layers of cool dense clouds expelled from the galaxy disk, and/or the emission comes from the mixing layers around these cool clumps where material from the hot gas is able to cool down and mix with these cool cloudlets. This first set of data and upcoming spectroscopy will be very helpful to understand the survival of dust grains in energetic environments, and their contribution to recycling baryonic material in the mid-plane of galaxies.

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