论文标题
对哈勃超深领域的Lyman-Continuum泄漏的自下而上搜索
A bottom-up search for Lyman-continuum leakage in the Hubble Ultra Deep Field
论文作者
论文摘要
背景：从星系中莱曼连续体的生产和逃脱的研究通常依赖于间接观察示踪剂的阵列在候选泄漏的预选中。 目的：在这里，我们通过完全删除这些选择标准并执行纯粹从静止框架LYC排放中选择的搜索来调查由于这些选择标准而丢失了多少电离辐射；以及这如何影响我们对电离背景的估计。 方法：我们将常规方法倒转，并对Redshifts $ 2 <z <3.5 $进行自下而上的搜索。使用来自HST和VLT/MUSE的档案数据，我们运行来自HUDF的UV-Filter HST图像上的软件，并将所有对象都检测到了一系列测试，以消除与电离源不一致的测试。 结果：我们发现6个新的和先前确定的候选泄漏者，绝对逃逸分数范围从36％到100％。我们的过滤标准消除了先前报道为文献中的候选发射极的对象，而我们在其他两个先前报道的来源的列曼连续体中报告了未检测。我们发现，我们的候选人为$ \ log_ {10}（ε_ν）= 25.32（+0.25）（ - 0.21）$和$ 25.29（+0.27）（+0.27）（-0.22）$ erg/s/s/s/s/s/s/s/s/s/cmpc $ for the the the strank stranking stranking的人，并为4.29（+0.22）$ 25.21）（-0.21）$ s = 25.32（+0.25）（ - 0.21）$ $ \ log_ {10}（ε_ν）做出贡献。这两个值都高于文献中其他最新数字，但与文献中的其他最新数字一致。 结论：我们的发现表明，不符合常规选择标准的星系可能会对宇宙电离领域做出不可忽略的贡献。我们建议在具有紫外线和大型辅助数据覆盖范围的经过良好研究的字段中进行类似的搜索，例如在整个烛台中。
Context: Studies of the production and escape of Lyman Continuum from galaxies often rely on array of indirect observational tracers in preselection of candidate leakers. Aims: Here, we investigate how much ionizing radiation might be missed due to these selection criteria by completely removing them and performing a search selected purely from rest-frame LyC emission; and how that affects our estimates of the ionizing background. Methods: We invert the conventional method and perform a bottom-up search for Lyman-continuum leaking galaxies at redshifts $2 < z < 3.5$. Using archival data from HST and VLT/MUSE, we run source finding software on UV-filter HST images from the HUDF, and subject all detected sources to a series of tests to eliminate those that are inconsistent with being ionizing sources. Results: We find 6 new and one previously identified candidate leakers with absolute escape fractions ranging from 36% to 100%. Our filtering criteria eliminate one object previously reported as a candidate ionizing emitter in the literature, while we report non-detection in the rest frame Lyman continuum of two other previously reported sources. We find that our candidates make a contribution to the metagalactic ionizing field of $\log_{10}(ε_ν) = 25.32(+0.25)(-0.21)$ and $25.29(+0.27)(-0.22)$ erg/s/Hz/cMpc$^3$ for the full set of candidates and for the 4 strongest candidates only; both values are higher than but consistent with other recent figures in the literature. Conclusions: Our findings suggest that galaxies that do not meet the usual selection criteria may make a non-negligible contribution to the cosmic ionizing field. We recommend that similar searches be carried out on a larger scale in well-studied fields with both UV and large ancillary data coverage, for example in the full set of CANDELS fields.
