论文标题
$ z \ simeq3.1 $的lyman Continuum castus逃生分数
Lyman Continuum Escape Fraction in Ly$α$ Emitters at $z\simeq3.1$
论文作者
论文摘要
我们在54个微弱的Lyman Alpha发射器（LAES）中测量了LYC逃生分数，在商品 - 南领域的$ z \ simeq3.1 $。由于$ r = 26.7 $ ab（$ m_ {uv} = -18.8 $，$ l \ simeq0.1l^*$）的平均幅度，这些星系代表了一群紧凑的年轻矮星系。它们的属性很可能类似于负责以$ z> 6 $进行宇宙的星系中的属性。我们没有在深{\ em hst} F336W图像中检测到任何单个LAE的LYC发射，该图像涵盖了其余的820Å。我们也没有在堆叠的F336W图像中检测到这些LAE的LYC发射。 $3σ$ lyc逃生分数的上限为$ f _ {\ rm esc} <14-32 \％$。但是，这些Laes的高$α$ rest-frame等效宽度，低恒星质量和紫外线亮度表明它们应该具有$ f _ {\ rm ESC}> 50 \％$。 The low LyC escape fraction from this work and other stacking analysis suggest that the LyC leaking galaxies with $f_{\rm esc} > 50\%$ at $z=2-3$ do not follow the relation between the $f_{\rm esc}$ and UV luminosity and Ly$α$ equivalent width (EW) derived from typical galaxies at similar redshift.因此，紫外线亮度和$α$等效宽度（EW）并不是LYC逃生部分的最佳指标。
We measure the LyC escape fraction in 54 faint Lyman Alpha Emitters (LAEs) at $z\simeq3.1$ in the GOODS-South field. With the average magnitude of $R=26.7$ AB ($M_{UV}=-18.8$, $L\simeq0.1L^*$), these galaxies represent a population of compact young dwarf galaxies. Their properties are likely to resemble those in the galaxies responsible for reionising the Universe at $z>6$. We do not detect LyC emission in any individual LAEs in the deep {\em HST} F336W images, which covers the rest-frame 820Å. We do not detect the LyC emission of these LAEs in the stacked F336W images, either. The $3σ$ upper limit of LyC escape fractions is $f_{\rm esc}<14-32\%$. However, the high Ly$α$ rest-frame equivalent width, low stellar mass and UV luminosity of these LAEs suggest that they should have $f_{\rm esc}>50\%$. The low LyC escape fraction from this work and other stacking analysis suggest that the LyC leaking galaxies with $f_{\rm esc} > 50\%$ at $z=2-3$ do not follow the relation between the $f_{\rm esc}$ and UV luminosity and Ly$α$ equivalent width (EW) derived from typical galaxies at similar redshift. Therefore, the UV luminosity and Ly$α$ equivalent width (EW) are not the best indicators for the LyC escape fraction.
