Lyman Continuum Emission from Spectroscopically Confirmed Lyα Emitters at z ∼ 3.1

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Yuchen Liu, Linhua Jiang, Rogier A. Windhorst, Yucheng Guo, Zhen-Ya Zheng
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Abstract

Abstract We present a study of Lyman continuum (LyC) emission in a sample of ∼150 Ly α emitters (LAEs) at z ≈ 3.1 in the Subaru-XMM Deep Survey field. These LAEs were previously selected using the narrowband technique and spectroscopically confirmed with Ly α equivalent widths (EWs) ≥ 45 Å. We obtain deep UV images using a custom intermediate-band filter U J that covers a wavelength range of 3330 ∼ 3650 Å, corresponding to 810 ∼ 890 Å in the rest frame. We detect five individual LyC galaxy candidates in the U J band, and their escape fractions ( f esc ) of LyC photons are roughly between 40% and 80%. This supports a previous finding that a small fraction of galaxies may have very high f esc . We find that the f esc values of the five LyC galaxies are not apparently correlated with other galaxy properties such as Ly α luminosity and EW, UV luminosity and slope, and star formation rate (SFR). This is partly due to the fact that these galaxies only represent a small fraction (∼3%) of our LAE sample. For the remaining LAEs that are not detected in U J , we stack their U J -band images and constrain their average f esc . The upper limit of the average f esc value is about 16%, consistent with the results in the literature. Compared with the non-LyC LAEs, the LyC LAEs tend to have higher Ly α luminosities, Ly α EWs, and SFRs, but their UV continuum slopes are similar to those of other galaxies.
光谱确认的Lyα发射体在z ~ 3.1的Lyman连续发射
摘要:我们研究了Subaru-XMM深测场中z≈3.1的约150个Ly α发射体(LAEs)样品中的Lyman连续体(LyC)发射。这些LAEs是先前使用窄带技术选择的,并经光谱证实,Ly α等效宽度(EWs)≥45 Å。我们使用定制的中波段滤波器U J获得深紫外图像,该滤波器覆盖的波长范围为3330 ~ 3650 Å,对应于其余帧中的810 ~ 890 Å。我们在uj波段探测到5个LyC候选星系,它们LyC光子的逃逸分数(fesc)大约在40%到80%之间。这支持了先前的一个发现,即一小部分星系可能具有非常高的fesc。我们发现5个LyC星系的fesc值与其他星系的性质如Ly α光度和EW、UV光度和斜率以及恒星形成速率(SFR)没有明显的相关性。这部分是由于这些星系只占我们LAE样本的一小部分(约3%)。对于其余未在uj中检测到的LAEs,我们将其uj波段图像叠加并约束其平均值。平均fesc值的上限约为16%,与文献结果一致。与非LyC LAEs相比,LyC LAEs具有更高的Ly α光度、Ly α EWs和SFRs,但其UV连续斜率与其他星系相似。
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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