论文标题
候选人人口III恒星综合体,Z = 6.629在缪斯深处镜头领域
Candidate Population III stellar complex at z=6.629 in the MUSE Deep Lensed Field
论文作者
论文摘要
我们在缪斯深处镜头磁场(MDLF)中发现了一个强烈的(μ> 40)lya发射(z = 6.629(s/n〜18)),其目标是哈勃边境领域星系群Macs 〜J0416。专用的镜头模拟表明,Lya发射区域必然会越过腐蚀性。 LYA的弧形形状在观察到的平面上延伸了3个ArcSec,是两个合并的多个图像的结果,每个图像都具有远程lya亮度l <〜2.8 x 10^10^(40)erg/s,来自限制区域(<150 pc有效半径)。堆叠近红外带后几乎无法在S/N〜2处检测到空间未解决的HST对应物,这对应于观察到的(固有的)幅度m_(1500)> 〜30.8(> 〜35.0)。如果IgM传输为t(igm)<0.5,则推断的REST-FRAME LYA等效宽度为EWO> 1120 A。低亮度和极大的Lya EWO与由数十个星星(〜10^4 msun)制成的种群〜III星复合物的案例相匹配,该恒星(〜10^4 msun)照射了越过腐蚀性的HII区域。虽然Lya和Stellar Continuum是有史以来最微弱的红移,但连续体和Lya排放可能会受到差分放大倍数的影响,可能会偏向EWO估计值。前面提到的暂定HST检测往往偏爱大型EWO,使如此微弱的流行候选者成为James Webb太空望远镜和极大的望远镜的关键目标。
We discovered a strongly lensed (μ>40) Lya emission at z=6.629 (S/N~18) in the MUSE Deep Lensed Field (MDLF) targeting the Hubble Frontier Field galaxy cluster MACS~J0416. Dedicated lensing simulations imply that the Lya emitting region necessarily crosses the caustic. The arc-like shape of the Lya extends 3 arcsec on the observed plane and is the result of two merged multiple images, each one with a de-lensed Lya luminosity L<~2.8 x 10^(40) erg/s arising from a confined region (< 150 pc effective radius). A spatially unresolved HST counterpart is barely detected at S/N~2 after stacking the near-infrared bands, corresponding to an observed(intrinsic) magnitude m_(1500)>~30.8(>~35.0). The inferred rest-frame Lya equivalent width is EWo > 1120 A if the IGM transmission is T(IGM)<0.5. The low luminosities and the extremely large Lya EWo match the case of a Population~III star complex made of several dozens stars (~ 10^4 Msun) which irradiate a HII region crossing the caustic. While the Lya and stellar continuum are among the faintest ever observed at this redshift, the continuum and the Lya emissions could be affected by differential magnification, possibly biasing the EWo estimate. The aforementioned tentative HST detection tend to favor a large EWo, making such a faint Pop~III candidate a key target for the James Webb Space Telescope and Extremely Large Telescopes.