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首页> 外文期刊>The Astrophysical journal >A SHOT IN THE DARK: A TECHNIQUE FOR LOCATING THE STELLAR COUNTERPARTS OF DAMPED Lyα ABSORBERS
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A SHOT IN THE DARK: A TECHNIQUE FOR LOCATING THE STELLAR COUNTERPARTS OF DAMPED Lyα ABSORBERS

机译:黑暗中的射击:定位潮湿的Lyα吸收剂星状对立面的技术

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We present initial results from a Magellan telescope program to image galaxies that give rise to damped Lyα absorbers (DLAs) at 1.63 ≤ z_(DLA) ≤ 2.37. Our program differs from previous efforts in that we target quasars with intervening Lyman limit systems (LLSs) along the line of sight at redshift z_(LLS) > 3.5. The higher redshift LLS is applied as a blocking filter to remove the glare of the background quasar at the rest-frame ultraviolet wavelengths of the foreground galaxy. The complete absence of quasar light offers us an unimpeded view along the sight line to the redshift of the LLS, allowing for an exhaustive search of the DLA galaxy to the sensitivity limit of the imaging data (at or better than 0.25L_*). In both of our pilot fields (PKS 2000-330 [z_(DLA) = 2.033] and SDSS 0322-0558 [z_(DLA) = 1.69]), we identify an L_* galaxy within 5″ of the sight line that has optical colors consistent with star-forming galaxies at z ≈ 2. We examine the correlation between absorption-line properties and galaxy luminosity and impact distance, and we compare the high-redshift galaxy and absorber pairs with those known at z < 1.
机译:我们介绍了麦哲伦望远镜程序对星系成像的初步结果,这些星系会在1.63≤z_(DLA)≤2.37的情况下产生阻尼的Lyα吸收剂(DLA)。我们的程序与以前的工作有所不同,因为我们将视线中的莱曼极限系统(LLS)定位为类星体,红移z_(LLS)> 3.5。较高的红移LLS用作阻挡滤镜,以消除前景星系的其余帧紫外线波长处的背景类星体的眩光。完全没有类星体光为我们提供了沿视线到LLS红移的畅通无阻的视图,从而可以彻底搜索DLA星系到成像数据的灵敏度极限(等于或大于0.25L_ *)。在我们的两个试验场(PKS 2000-330 [z_(DLA)= 2.033]和SDSS 0322-0558 [z_(DLA)= 1.69])中,我们确定了视线5英寸以内的L_ *星系颜色与z≈2处的恒星形成星系一致。我们研究了吸收线特性与星系光度和撞击距离之间的相关性,并将高红移星系和吸收体对与z <1时已知的那些相比较。

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