论文标题
Deep Hubble太空望远镜成像在$ z = 2.19 $的扩展ly $α$上，带有湿的莱曼alpha系统作为天然coronagraph
Deep Hubble Space Telescope Imaging on the Extended Ly$α$ Emission of a QSO at $z = 2.19$ with Damped Lyman Alpha System as a Natural Coronagraph
论文作者
论文摘要
最近的观察结果表明，近端阻尼的$α$（PDLA）系统可用于研究准恒星对象（QSOS）的宿主星系，因为PDLA可以阻止中央QSO中的明亮点传播（PSF）。使用$ \ it {hst} $/wfc3的六轨窄段成像，我们在QSO SDSSSSJ115432.67-021537.9中呈现LY $α$排放的第一个高分辨率窄带图像。我们在窄带成像中检测到一个主要成分和一个次要组件。将$ \ it {hst} $/wfc3成像与深麦哲伦/法族光谱相结合，我们衡量的是，ly $α$ flux f $ _ {\ rm {lyα}} $ = 1.56 $ = 1.56 $ \ pm0.10 \ pm0.10 \ times10 \ times10^{ - 16}} { - 16} $ $ $ \ rm \ rm {erg \ rm {erg \ s^erg \ s} cm^{ - 2}} $，它是发光的（$ \ $ \ $ 2.7 l $^{\ star} _ {\ rm {lyα}} $）ly $α$ emitters $ \ it {z} = $ 2.19。 $ \ rm {lyα} $ - 基于星形的形成率（SFR）为$ \ sim $ 7 $ \ textrm {m _ {\ sun} \ yr^{ - 1}} $。这些观察结果有利于宿主星系的恒星形成可能是为LY $α$发射供电的主要机制。这种新方法为研究运动结构的研究和QSO宿主周围扩展的$α$发射区域的空间分布提供了新的启示。
Recent observations suggest that proximate damped Ly$α$ (PDLA) systems can be used to study the host galaxies of Quasi-stellar objects (QSOs), because the PDLAs can block the bright point-spread-function (PSF) from central QSOs. Using six-orbits of narrowband imaging with $\it{HST}$/WFC3, we present the first high resolution narrowband image of the Ly$α$ emission in the PDLA trough of the QSO SDSSJ115432.67-021537.9 . We detect one major component and one minor component in the narrowband imaging. Combining the $\it{HST}$/WFC3 imaging with deep Magellan/MagE spectra, we measure that the Ly$α$ flux F$_{\rm{Lyα}}$ = 1.56$\pm0.10 \times10^{-16}$ $\rm{erg\ s^{-1}\ cm^{-2}}$, which is among the luminous ($\approx$ 2.7 L$^{\star}_{\rm{Lyα}}$) Ly$α$ emitters at $\it{z} =$ 2.19. The $\rm{Lyα}$-based star formation rate (SFR) is $\sim$ 7 $\textrm{M_{\sun} \ yr^{-1}}$. These observational results favor that the star formation from the host galaxy could be the main mechanism to power the Ly$α$ emission. This new method sheds new light on the study of the kinematic structure and the spatial distribution of the extended Ly$α$ emitting regions around the QSO host.
