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DES:从暗能量巡天发现第一个发光z > 6类星体

DES J0454-4448: Discovery of the First Luminous z > 6 Quasar from the Dark Energy Survey

S. L. Reed, R. G. McMahon, M. Banerji, G. D. Becker, E. Gonzalez-Solares, P. Martini, F. Ostrovski, M. Rauch, T. Abbott, F. B. Abdalla, S. Allam, A. Benoit-Levy… 展开作者

S. L. Reed, R. G. McMahon, M. Banerji, G. D. Becker, E. Gonzalez-Solares, P. Martini, F. Ostrovski, M. Rauch, T. Abbott, F. B. Abdalla, S. Allam, A. Benoit-Levy, E. Bertin, E. Buckley-Geer, D. Burke, A. Carnero Rosell, L. N. da Costa, C. ĎAndrea, D. L. DePoy, S. Desai, H. T. Diehl, P. Doel, C. E Cunha, J. Estrada, A. E. Evrard, A. Fausti Neto, D. A. Finley, P. Fosalba, J. Frieman, D. Gruen, K. Honscheid, D. James, S. Kent, K. Kuehn, N. Kuropatkin, O. Lahav, M. A. G. Maia, M. Makler, J. Marshall, K. Merritt, R. Miquel, J. Mohr, B. Nord, R. Ogando, A. Plazas, K. Romer, A. Roodman, E. Rykoff, M. Sako, E. Sanchez, B. Santiago, M. Schubnell, I. Sevilla, C. Smith, M. Soares-Santos, E. Suchyta, M. E. C. Swanson, G. Tarle, D. Thomas, D. Tucker, A. Walker, R. H. Wechsler

摘要:

本文介绍了利用暗能量巡天(DES)的izY多色测光观测对高红移z $\ge$ 6类星体进行巡天的第一批结果。在这里,我们报告了$\rm z_{AB}, Y_{AB}$ = 20.2的发现和光谱确认,20.2(M $_{1450}$ = $-$ 26.5)类星体DES J 0454 $-$ 4448,发射线红移为z = 6.10 $\pm$ 0.03,HI近区大小为4.6 $\pm$ 1.7 Mpc。2.46和z $_{AB} < 21.5$从$\rm \sim$ 300 deg $^2$的区域。它是我们43个候选物中最亮的,并且仅基于DES i $-$ z和z $-$ Y颜色进行光谱学鉴定。该类星体被WISE探测到,并具有$W1_{AB} = 19.68$。一个光谱证实的类星体的发现与5.7 $<$ z $<$ 6.5和z $_{AB} \leq$ 20.2是一致的最近确定的光度函数在z $\sim$ 6。DES完成时,将对$\rm \sim$进行成像,5000度$^2$至$Y_{AB}$ = 23.0($5σ$点源),我们预计将发现$>$ 50-100个z $>$ 6的新类星体,包括3-10个z $>$ 7的类星体,这将大大增加目前已知的适合详细研究的类星体数量,包括确定星系际介质的中性HI分数(IGM)在氢再电离时期。

英文摘要:

We present the first results of a survey for high redshift, z $\ge$ 6, quasars using izY multi-colour photometric observations from the Dark Energy Survey (DES). Here we report the discovery and spectroscopic confirmation of the $\rm z_{AB}, Y_{AB}$ = 20.2, 20.2 (M$_{1450}$ = $-$26.5) quasar DES J0454$-$4448 with an emission line redshift of z = 6.10$\pm$0.03 and a HI near zone size of 4.6 $\pm$ 1.7 Mpc.The quasar was selected as an i-band drop out with i$-$z = 2.46 and z$_{AB} < 21.5$ from an area of $\rm \sim$300 deg$^2$. It is the brightest of our 43 candidates and was identified for follow-up spectroscopically solely based on the DES i$-$z and z$-$Y colours. The quasar is detected by WISE and has $W1_{AB} = 19.68$. The discovery of one spectroscopically confirmed quasar with 5.7 $<$ z $<$ 6.5 and z$_{AB} \leq$ 20.2 is consistent with recent determinations of the luminosity function at z $\sim$ 6. DES when completed will have imaged $\rm \sim$5000 deg$^2$ to $Y_{AB}$ = 23.0 ($5σ$ point source) and we expect to discover $>$ 50-100 new quasars with z $>$ 6 including 3-10 with z $>$ 7 dramatically increasing the numbers of quasars currently known that are suitable for detailed studies including determination of the neutral HI fraction of the intergalactic medium (IGM) during the epoch of Hydrogen reionization.

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