The nature of sub-millimetre galaxies II: an ALMA comparison of SMG dust heating mechanisms
The nature of sub-millimetre galaxies II: an ALMA comparison of SMG dust heating mechanisms
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亚毫米星系的本质 II：SMG 尘埃加热机制的 ALMA 比较
DOI：
10.1093/mnras/stac002
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发表时间：
2022
影响因子：
4.8
通讯作者：
Ansarinejad B
中科院分区：
文献类型：
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作者：
Ansarinejad B
比较了活动星系核和星星形成对亚毫米星系尘埃加热的贡献。我们已经使用阿尔马在0.1角秒分辨率的图像一个完整的通量有限的样品的7个亚毫米源以前显示有光谱能量分布，以及适合模糊AGN恒星形成星系模板。事实上，两个亚毫米级的源从它们吸收的X射线辐射中被认为是类星体。我们发现所有SMG的亚毫米级尺寸都很小（101 - 2 kpc），通常比近红外（NIR）中检测到的任何主机小103倍。在所有情况下，这五个SMG的亚毫米大小与阿尔马观测到的两个已知类星体和fourz 106类星体相当。我们在这个完整的样本中没有发现弥漫性螺旋臂的证据。然后，我们将远红外（FIR）光度转换为星星形成率（SFR）表面密度，发现SMG占据了与我们样本中已知类星体相同的范围。我们的结论是，在亚毫米的大小，范围相对于主机和SFR密度，以及光度和中红外（MIR）的颜色，有SMG和亚毫米明亮类星体之间的区别不大。最后，我们提出了初步的证据，SMG与更高的MIR光度和次毫米响亮的类星体往往有尘埃成分的范围比他们的发光SMG同行更热的温度。根据这些结果，我们继续认为，发光的SMG可能拥有尘埃吸收类星体，这些类星体可能同时主导FIR和硬X射线背景。
We compare the contribution of active galactic nuclei (AGNs) and star formation towards dust heating in sub-mm galaxies (SMGs). We have used ALMA at 0.1-arcsec resolution to image a complete flux-limited sample of seven sub-mm sources previously shown to have spectral energy distributions that were as well-fitted by obscured AGN as star-forming galaxy templates. Indeed, two sub-mm sources were known to be quasars from their absorbed X-ray emission. We find the sub-mm sizes of all SMGs to be small (≈1−2 kpc) and generally ∼3 times smaller than any host detected in the near-infrared (NIR). In all cases, the five SMGs are comparable in sub-mm size to the two known quasars and fourz≈ 6 quasars, also observed with ALMA. We detect no evidence of diffuse spiral arms in this complete sample. We then convert the far-infrared (FIR) luminosities to star formation rate (SFR) surface densities and find that the SMGs occupy the same range as the known quasars in our sample. We conclude that in terms of sub-mm size, extent relative to host and SFR density as well as luminosity and mid-IR (MIR) colour, there is little distinction between the SMGs and sub-mm bright quasars. Finally, we present preliminary evidence that SMGs with higher MIR luminosities and sub-mm loud quasars tend to have dust components that range to hotter temperatures than their less luminous SMG counterparts. In light of these results, we continue to suggest that luminous SMGs may host dust-absorbed quasars that may simultaneously dominate the FIR and hard X-ray backgrounds.
DOI：
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发表时间：
1998
期刊：
影响因子：
--
作者：
A. Fowler
通讯作者：
A. Fowler
scipy/scipy：SciPy 1.5.3
DOI：
--
发表时间：
2020
期刊：
影响因子：
--
作者：
Pauli Virtanen;Ralf Gommers;Evgeni Burovski;Travis E. Oliphant;Warren Weckesser;David Cournapeau;alexbrc;Pearu Peterson;Tyler Reddy;Josh Wilson;Matt Haberland;Nikolay Mayorov;Andrew T. Nelson;Stefan van der Walt;Denis Laxalde;M. Brett;Ilhan Polat;Eric Larson;Jarrod Millman;Paul van Mulbregt;eric;CJ Carey;Eric Moore;R. Kern;Tim Leslie;Josef Perktold;Kai Striega;Yu Feng
通讯作者：
Yu Feng