The anatomy of a star-forming galaxy II: FUV heating via dust
The anatomy of a star-forming galaxy II: FUV heating via dust
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DOI：
10.1093/mnras/staa2935
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发表时间：
2020-09
影响因子：
4.8
通讯作者：
S. Benincasa;S. Benincasa;J. Wadsley;H. Couchman;A. Pettitt;B. Keller;R. Woods;J. J. Grond-J.
中科院分区：
文献类型：
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作者：
S. Benincasa;S. Benincasa;J. Wadsley;H. Couchman;A. Pettitt;B. Keller;R. Woods;J. J. Grond-J.
远紫外线（FUV）辐射在年轻星星团的能量收支中远远超过紫外线、超新星和风，但在星系模拟中却很难建模。我们目前的第一个孤立的星系盘模拟的结果，包括光电加热气体通过尘埃颗粒从FUV辐射自洽，使用射线跟踪的方法，计算光学深度沿着源接收器视线。这是TREVR辐射传输算法的第一个科学应用。我们发现，FUV辐射本身不能调节星星的形成。然而，FUV辐射产生温暖的中性气体，并能够产生具有现实尺度高度的调节星系。FUV也是一种远程反馈，在星系外盘中更为重要。我们还使用了超级气泡反馈模型，它只依赖于单位恒星质量的超新星能量，比常见的参数驱动的替代方案在物理上更现实，从而更好地约束超新星反馈的影响。FUV和超新星一起可以调节星星的形成，而不会产生太多的热电离介质，并且与单独的超新星相比，对ISM的破坏较小。
Far-Ultraviolet (FUV) radiation greatly exceeds ultraviolet, supernovae and winds in the energy budget of young star clusters but is poorly modeled in galaxy simulations. We present results of the first isolated galaxy disk simulations to include photo-electric heating of gas via dust grains from FUV radiation self-consistently, using a ray-tracing approach that calculates optical depths along the source-receiver sight-line. This is the first science application of the TREVR radiative transfer algorithm. We find that FUV radiation alone cannot regulate star formation. However, FUV radiation produces warm neutral gas and is able to produce regulated galaxies with realistic scale heights. FUV is also a long-range feedback and is more important in the outer disks of galaxies. We also use the super-bubble feedback model, which depends only on the supernova energy per stellar mass, is more physically realistic than common, parameter-driven alternatives and thus better constrains supernova feedback impacts. FUV and supernovae together can regulate star formation without producing too much hot ionized medium and with less disruption to the ISM compared to supernovae alone.