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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >A Chandra and ALMA study of X-ray-irradiated gas in the central similar to 100pc of the Circinus galaxy
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A Chandra and ALMA study of X-ray-irradiated gas in the central similar to 100pc of the Circinus galaxy

机译：中央X射线照射气体的混挤和Alma研究类似于循环银河100pc

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摘要

We report on a study of X-ray-irradiated gas in the central similar to 100pc of the Circinus galaxy, which hosts a Compton-thick active galactic nucleus (AGN), at 10pc resolution using Chandra and ALMA. Based on similar to 200ks Chandra/ACIS-S data, we created an image of the Fe K alpha line at 6.4keV, tracing X-ray-irradiated dense gas. The ALMA data in Bands6 (similar to 270GHz) and7 (similar to 350GHz) cover five molecular lines: CO(J = 3-2), HCN(J = 3-2), HCN(J = 4-3), HCO+(J = 3-2), and HCO+(J = 4-3). The detailed spatial distribution of dense molecular gas was revealed, and compared to the iron line image. The molecular gas emission appeared faint in regions with bright iron emission. Motivated by this, we quantitatively discuss the possibility that the molecular gas is efficiently dissociated by AGN X-ray irradiation (i.e., creating an X-ray-dominated region). Based on a non-local thermodynamic equilibrium model, we constrained the molecular gas densities and found that they are as low as interpreted by X-ray dissociation. Furthermore, judging from inactive star formation reported in the literature, we suggest that the X-ray emission has the potential to suppress star formation, particularly in the proximity of the AGN.
机译：我们报告了X射线辐照气体在中央的辐射气体的研究，其循环星系的100pc，其在10pc分辨率下，使用Chandra和Alma在10pc分辨率下宿主。基于类似于200时的Chandra / ACIS-S数据，我们在6.4keV下创建了Fe K Alpha系列的图像，跟踪X射线照射的致密气体。频段中的ALMA数据（类似于270GHz）和7（类似于350GHz）覆盖五个分子线：CO（J = 3-2），HCN（J = 3-2），HCN（J = 4-3），HCO +（ J = 3-2）和HCO +（J = 4-3）。揭示了致密分子气体的详细空间分布，并与铁线图像相比。分子气体排放在具有亮铁发射的地区出现微弱。由此激励，我们定量讨论了通过AgN X射线照射有效地解离分子气体的可能性（即，产生X射线占主导地区域）。基于非局部热力学平衡模型，我们限制了分子气密性，发现它们与X射线解离的解释性低。此外，从文献中报告的非活性明星形成判断，我们建议X射线发射具有抑制星形成的可能性，特别是在AGN的附近。

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