论文标题
新发现的$ z \ sim 13 $掉落的来源Starburst Galaxies还是类星体？
Are the Newly-Discovered $z \sim 13$ Drop-out Sources Starburst Galaxies or Quasars?
论文作者
论文摘要
在大爆炸之后，发现两个$ z \ sim 13 $ Galaxy候选人在一个时代仅$ 330 $ MYR的Galaxy组打开了一个新窗口。在这里，我们调查了这些来源的物理性质：我们是否在这样的早期时代目睹了星形形成星系或类星体？如果由恒星形成驱动，则可以共同解释观察到的紫外线（UV）亮度和数量密度，如果：（i）这些星系是极端的星形形成剂，恒星形成率$ 5-24 \倍$ $ 5-24 \乘以$ 5-24 \乘以$ 5-24 \乘以$ 5-24 \乘以$ 5-24的$ $ $ $ 5-24 \乘以$ 5-24 \乘以$ 5-24 \倍。 （ii）随着光环质量的增加，星形的形成效率提高，并通过从$ z \ sim 10-5 $增加灰尘衰减来抵消； （iii）它们形成具有极高的初始质量功能的恒星。 Quasar假设也是合理的，由$ \ sim 10^8 \，\ Mathrm {m _ {\ odot}} $以$ \ sim 10^8 \的黑洞产生的紫外线发光度（$ f _ {\ f _ {\ rm edd} \ sim 1.0 $）。 $ z \ sim13 $的黑洞质量将需要非常具有挑战性但不可避免的生长参数。如果通过光谱镜证实，这两个来源将代表一个出色的实验室，以在先前无法接近的红移下研究宇宙。
The detection of two $z\sim 13$ galaxy candidates has opened a new window on galaxy formation at an era only $330$ Myr after the Big Bang. Here, we investigate the physical nature of these sources: are we witnessing star forming galaxies or quasars at such early epochs? If powered by star formation, the observed ultraviolet (UV) luminosities and number densities can be jointly explained if: (i) these galaxies are extreme star-formers with star formation rates $5-24\times$ higher than those expected from extrapolations of average lower-redshift relations; (ii) the star formation efficiency increases with halo mass and is countered by increasing dust attenuation from $z \sim 10-5$; (iii) they form stars with an extremely top-heavy initial mass function. The quasar hypothesis is also plausible, with the UV luminosity produced by black holes of $\sim 10^8 \, \mathrm{M_{\odot}}$ accreting at or slightly above the Eddington rate ($f_{\rm Edd}\sim 1.0$). This black hole mass at $z\sim13$ would require very challenging, but not implausible, growth parameters. If spectroscopically confirmed, these two sources will represent a remarkable laboratory to study the Universe at previously inaccessible redshifts.
