arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1701.04852astro-ph.GAastro-ph.CO
收藏

通过对VISTA、WISE和暗能量巡天1年观测的SED模型拟合选出的8个新的z > 6发光类星体

Eight new luminous z > 6 quasars selected via SED model fitting of VISTA, WISE and Dark Energy Survey Year 1 Observations

S. L. Reed, R. G. McMahon, P. Martini, M. Banerji, M. Auger, P. C. Hewett, S. E. Koposov, S. L. J. Gibbons, E. Gonzalez-Solares, F. Ostrovski, S. S. Tie, F. B. … 展开作者

S. L. Reed, R. G. McMahon, P. Martini, M. Banerji, M. Auger, P. C. Hewett, S. E. Koposov, S. L. J. Gibbons, E. Gonzalez-Solares, F. Ostrovski, S. S. Tie, F. B. Abdalla, S. Allam, A. Benoit-Levy, E. Bertin, D. Brooks, E. Buckley-Geer, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, L. N. da Costa, D. L. DePoy, S. Desai, H. T. Diehl, P. Doel, A. E. Evrard, D. A. Finley, B. Flaugher, P. Fosalba, J. Frieman, J. Garcıa-Bellido, E. Gaztanaga, D. A. Goldstein, D. Gruen, R. A. Gruendl, G. Gutierrez, D. J. James, K. Kuehn, N. Kuropatkin, O. Lahav, M. Lima, M. A. G. Maia, J. L. Marshall, P. Melchior, C. J. Miller, R. Miquel, B. Nord, R. Ogando, A. A. Plazas, A. K. Romer, E. Sanchez, V. Scarpine, M. Schubnell, I. Sevilla-Noarbe, R. C. Smith, F. Sobreira, E. Suchyta, M. E. C. Swanson, G. Tarle, D. L. Tucker, A. R. Walker, W. Wester

摘要:

利用ESO NTT望远镜和Gemini South望远镜发现了8个新的6.0 < z < 6.5且z $_{AB}$ < 21.0的类星体。这些类星体是在没有任何恒星星系形态标准的情况下从1533度$^{2}$使用SED模型拟合来自暗能量巡天(g,r,i,z,Y),VISTA半球巡天(J,H,K)和宽视场红外巡天探测器(W1,W2)的光度数据进行光度选择的。测光数据用具有红移依赖的Lyman-α森林吸收和一系列内禀红化的类星体模型SED网格以及一系列低质量冷星模型拟合。使用基于SED模型的$χ^{2}$统计量对候选人进行排名,该统计量可扩展到其他未来的成像调查(例如LSST,Euclid)。我们的光谱确认成功率为100%,而不需要像其他此类研究中使用的那样进行后续光度观测。结合自动去除主要类型的非天体物理污染物,该方法允许在没有人为干预的情况下处理大型数据集,并且不会被虚假的虚假候选者过度运行。我们还提出了一个强大的参数红移估计技术,提供了可比的精度MgII和CO的红移估计。我们发现了两个z $\sim$ 6.2类星体,其HII近带大小< 3 Mpc,这可能表明这些类星体可能是年轻的,年龄< 10 $^6$ - 10 $^7$年,或者位于IGM的过密区。z = 6.5的类星体VDESJ 0224 -4711的J $_{AB}$ = 19.75是第二个最明亮的类星体,z > 6.5。

英文摘要:

We present the discovery and spectroscopic confirmation with the ESO NTT and Gemini South telescopes of eight new 6.0 < z < 6.5 quasars with z$_{AB}$ < 21.0. These quasars were photometrically selected without any star-galaxy morphological criteria from 1533 deg$^{2}$ using SED model fitting to photometric data from the Dark Energy Survey (g, r, i, z, Y), the VISTA Hemisphere Survey (J, H, K) and the Wide-Field Infrared Survey Explorer (W1, W2). The photometric data was fitted with a grid of quasar model SEDs with redshift dependent Lyman-α forest absorption and a range of intrinsic reddening as well as a series of low mass cool star models. Candidates were ranked using on a SED-model based $χ^{2}$-statistic, which is extendable to other future imaging surveys (e.g. LSST, Euclid). Our spectral confirmation success rate is 100% without the need for follow-up photometric observations as used in other studies of this type. Combined with automatic removal of the main types of non-astrophysical contaminants the method allows large data sets to be processed without human intervention and without being over run by spurious false candidates. We also present a robust parametric redshift estimating technique that gives comparable accuracy to MgII and CO based redshift estimators. We find two z $\sim$ 6.2 quasars with HII near zone sizes < 3 proper Mpc which could indicate that these quasars may be young with ages < 10$^6$ - 10$^7$ years or lie in over dense regions of the IGM. The z = 6.5 quasar VDESJ0224-4711 has J$_{AB}$ = 19.75 is the second most luminous quasar known with z > 6.5.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑