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arXiv 1710.09482astro-ph.GA
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朝阳弧:在已知最亮的透镜星系中观察到的直接莱曼α逃逸

The Sunburst Arc: Direct Lyman α escape observed in the brightest known lensed galaxy

T. Emil Rivera-Thorsen, Håkon Dahle, Max Gronke, Matthew Bayliss, Jane Rigby, Robert Simcoe, Rongmon Bordoloi, Monica Turner, Gabor Furesz

摘要:

我们目前的休息帧紫外和光学光谱的最明亮的透镜星系尚未发现,在红移z = 2.4。这个来源揭示了一个特征,三峰莱曼α轮廓已被各种理论工作预测,但据我们所知,以前没有明确观察到。这一特征很好地拟合了两个分量的叠加:一个是由大量辐射转移产生的双峰轮廓,另一个是由直接逃逸的莱曼α光子产生的狭窄的中心分量;但单独用这两个分量都拟合不好。我们证明,该功能是不太可能包含来自附近的污染源,和中心峰是不受辐射转移的影响,除了非常轻微的吸收。该功能被检测到的信噪比超过80每像素线中心,并承担很强的相似性,数值模型预测的合成配置文件。

英文摘要:

We present rest-frame ultraviolet and optical spectroscopy of the brightest lensed galaxy yet discovered, at redshift z = 2.4. This source reveals a characteristic, triple-peaked Lyman α profile which has been predicted by various theoretical works but to our knowledge has not been unambiguously observed previously. The feature is well fit by a superposition of two components: a double-peak profile emerging from substantial radiative transfer, and a narrow, central component resulting from directly escaping Lyman α photons; but is poorly fit by either component alone. We demonstrate that the feature is unlikely to contain contamination from nearby sources, and that the central peak is unaffected by radiative transfer effects apart from very slight absorption. The feature is detected at signal-to-noise ratios exceeding 80 per pixel at line center, and bears strong resemblance to synthetic profiles predicted by numerical models.

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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