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arXiv 2305.02443astro-ph.GA
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长与短:紫外-射电星系拟合的益处与杠杆作用

The Long and the Short of It: The Benefits and Leverage of Ultraviolet-Radio Galaxy Fitting

Jessica E. Thorne, Aaron S. G. Robotham, Sabine Bellstedt, Luke J. M. Davies

AI总结:

本研究探索了同时拟合星系远紫外到射电光谱能量分布的实用性,发现加入射电连续谱测量能显著提升恒星形成率和尘埃光度的恢复精度,尤其在远红外数据缺失时。

摘要:

传统上,尽管星系的远紫外(FUV)到远红外(FIR)和射电光谱能量分布(SED)受相同物理过程塑造,但它们通常被分开考虑。在本研究中,我们探索了使用ProSpect SED拟合代码的扩展版本同时拟合FUV-射电SED的实用性,该版本考虑了自由-自由发射和同步辐射发射的贡献。我们使用了来自Deep Extragalactic VIsible Legacy Survey (DEVILS)和Key Insights on Nearby Galaxies: a Far-Infrared Survey with Herschel (KINGFISH)的一小部分星系样本,这些星系具有高质量且稳健的FUV-射电数据,为测试ProSpect的射电扩展提供了理想样本。由于射电扩展的参数化将射电连续谱与FIR发射联系起来,我们探索了使用射电连续谱测量作为尘埃衰减与发射之间能量平衡约束的益处。我们发现,在缺乏中红外至远红外(MIR-FIR)测光数据的情况下,包含1.4 GHz连续谱测量可以提高恢复的星系恒星形成率和尘埃光度的准确性,分别将中位不确定性降低了0.1和0.2 dex。我们还证明,纳入3和10 GHz测量可以进一步约束能量平衡,从而约束恒星形成率和尘埃光度。这表明将FUV-FIR SED拟合技术扩展到射电频率的优势,特别是随着我们进入FIR调查仍然有限而射电数据变得丰富的时代(即SKA及其先驱项目)。

英文摘要:

Traditionally, the far ultraviolet (FUV) to far-infrared (FIR) and radio spectral energy distributions (SEDs) of galaxies have been considered separately despite the common physical process shaping them. In this work, we explore the utility of simultaneously fitting FUV-radio SEDs using an extended version of the ProSpect SED fitting code considering contributions from both free-free and synchrotron emission. We use a small sample of galaxies from the Deep Extragalactic VIsible Legacy Survey (DEVILS) and the Key Insights on Nearby Galaxies: a Far-Infrared Survey with Herschel (KINGFISH) where high-quality and robust FUV-radio data are available to provide an ideal sample for testing a radio extension of ProSpect. As the parameterisation of the radio extension links the radio continuum to the FIR emission, we explore the benefit of using radio continuum measurements as a constraint on the energy balance between dust attenuation and emission. We find that for situations where MIR-FIR photometry is unavailable, including a 1.4 GHz continuum measurement allows for improved accuracy in recovered star formation rates and dust luminosities of galaxies reducing the median uncertainty by 0.1 and 0.2 dex respectively. We also demonstrate that incorporating 3 and 10 GHz measurements allows for further constraint on the energy balance and therefore the star formation rate and dust luminosity. This demonstrates the advantage of extending FUV-FIR SED fitting techniques to radio frequencies, especially as we move into an era where FIR surveys will remain limited and radio data become abundant (i.e. with the SKA and precursors).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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