论文标题
Lyman Continuum Canneuum从低质量的Starbursts z = 1.3
Lyman Continuum Escape Fraction from Low-mass Starbursts at z=1.3
论文作者
论文摘要
我们对Z〜1.3处的Lyman Continuum（LYC）逃生部分提出了新的约束。我们使用高级摄像机（ACS）太阳盲通道（SBC）在哈勃太空望远镜（HST）上获得深度高灵敏度的远处成像，以1.2 <z <z <1.4的靶向11个星形的星系。从3D-HST调查中选择星系，其具有高H $α$等效宽度（EW），EW>190Å，低恒星质量（M* <10^10 m_sun）和U频段的U <24.2。这些标准确定了年轻的，低金属性的恒星爆发种群，类似于原始星形的星系，据信宣布宇宙。我们在单个星系中或远处图像中的堆栈中未检测到任何LYC信号（具有S/N> 3）。我们将$3σ$限制在单个星系的相对逃逸分数上为f_ {esc，rel} <[0.10-0.22]，一个堆叠的$3σ$限制为f_ {cess，rel} <0.07。与文献中确认的LYC发射器相比，我们样本中的星系涵盖了各种星系特性的相似范围，包括恒星质量，灰尘衰减和星形形成速率（SFR）。特别是，我们比较了确认的LYC发射器和非检测的H $α$和[OIII] EWS的分布，包括本研究中的星系。最后，我们讨论在H $α$ ews分布中看到的二分法是否可以将LYC发射器与非探测区分开。
We present a new constraint on the Lyman Continuum (LyC) escape fraction at z~1.3. We obtain deep, high sensitivity far-UV imaging with the Advanced Camera for Surveys (ACS) Solar Blind Channel (SBC) on the Hubble Space Telescope (HST), targeting 11 star-forming galaxies at 1.2<z<1.4. The galaxies are selected from the 3D-HST survey to have high H$α$ equivalent width (EW) with EW > 190 Å, low stellar mass (M* < 10^10 M_sun) and U-band magnitude of U<24.2. These criteria identify young, low metallicity star bursting populations similar to the primordial star-forming galaxies believed to have reionized the universe. We do not detect any LyC signal (with S/N >3) in the individual galaxies or in the stack in the far-UV images. We place $3σ$ limits on the relative escape fraction of individual galaxies to be f_{esc,rel}<[0.10-0.22] and a stacked $3σ$ limit of f_{esc,rel}<0.07. Comparing to the confirmed LyC emitters from the literature, the galaxies in our sample span similar ranges of various galaxy properties including stellar mass, dust attenuation, and star formation rate (SFR). In particular, we compare the distribution of H$α$ and [OIII] EWs of confirmed LyC emitters and non-detections including the galaxies in this study. Finally, we discuss if a dichotomy seen in the distribution of H$α$ EWs can perhaps distinguish the LyC emitters from the non-detections.
