Testing an indirect method for identifying galaxies with high levels of Lyman continuum leakage

Testing an indirect method for identifying galaxies with high levels of Lyman continuum leakage
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测试一种间接方法来识别具有高水平莱曼连续介质泄漏的星系

DOI:
10.1093/mnras/staa2507
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发表时间:
2020
影响因子:
4.8
通讯作者:
Kubo Mariko
Kubo Mariko
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yamanaka Satoshi;Inoue Akio K;Yamada Toru;Zackrisson Erik;Iwata Ikuru;Micheva Genoveva;Mawatari Ken;Hashimoto Takuya;Kubo Mariko

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利用在SSA 22场中探测到莱曼连续统(LyC)泄漏的atz λ 3星系样本,我们试图验证一种基于H β等效宽度(EW)和UV连续统β斜率测量的间接方法,以识别具有高LyC逃逸分数fesc的星系。为此,我们用Keck/MOSFIRE方法测量了光谱红移为zspec = 3.3的LyC星系(LCG)、光度红移为zphot = 2.7-3.7的莱曼破裂星系(LBG)和光谱红移为zphot = 3.1的Ly α发射体的H β发射线通量。我们还重新确认了光谱红移,并测量了两个LCG和六个LBG的H β发射线通量。对于我们的样本中具有最极端fesc的LCG,正如LyC光子的直接探测所揭示的那样,我们发现EW(H β)-β方法给出了fesc的大致一致的估计,尽管误差线仍然很大。我们还讨论了如何结合offescmeasurements的基础上直接和间接的方法可以揭示的LyC逃逸机制和各向异性的泄漏。
Using a sample of galaxies atz≈ 3 with detected Lyman Continuum (LyC) leakage in the SSA22 field, we attempt to verify a proposed indirect method for identifying cases with high LyC escape fractionfescbased on measurements of the H β equivalent width (EW) and the β slope of the UV continuum. To this end, we present Keck/MOSFIRE H β emission line flux measurements of LyC galaxies (LCGs) at spectroscopic redshiftszspec∼ 3.3, Lyman break galaxies (LBGs) at photometric redshiftszphot= 2.7–3.7, and Ly α emitters atzphot= 3.1. We also reconfirm the spectroscopic redshifts and measure the H β emission-line fluxes from two LCGs and six LBGs. For the LCG in our sample with the most extremefesc, as revealed by the direct detection of LyC photons, we find that the EW(H β)–β method gives a broadly consistent estimate forfesc, although the error bars remain very large. We also discuss how a combination offescmeasurements based on direct and indirect methods can shed light on the LyC escape mechanism and the anisotropy of the leakage.
在詹姆斯·韦伯太空望远镜巡天中识别具有极端莱曼连续泄漏水平的再电离时代星系
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