تقرير
The Extremely Luminous Quasar Survey in the Sloan Digital Sky Survey footprint. III. The South Galactic Cap Sample and the Quasar Luminosity Function at Cosmic Noon
| العنوان: | The Extremely Luminous Quasar Survey in the Sloan Digital Sky Survey footprint. III. The South Galactic Cap Sample and the Quasar Luminosity Function at Cosmic Noon |
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| المؤلفون: | Schindler, Jan-Torge, Fan, Xiaohui, McGreer, Ian D., Yang, Jinyi, Wang, Feige, Green, Richard, Fynbo, Johan P. U., Krogager, Jens-Kristian, Green, Elisabeth M., Huang, Yun-Hsin, Kadowaki, Jennifer, Patej, Anna, Wu, Ya-Lin, Yue, Minghao |
| سنة النشر: | 2018 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | We have designed the Extremely Luminous Quasar Survey (ELQS) to provide a highly complete census of unobscured UV-bright quasars during the cosmic noon, $z=2.8-5.0$. Here we report the discovery of 70 new quasars in the ELQS South Galactic Cap (ELQS-S) quasar sample, doubling the number of known extremely luminous quasars in $4,237.3\,\rm{deg}^2$ of the SDSS footprint. These observations conclude the ELQS and we present the properties of the full ELQS quasar catalog, containing 407 quasars over $11,838.5\,\rm{deg}^2$. Our novel ELQS quasar selection strategy resulted in unprecedented completeness at the bright end and allowed us to discover 109 new quasars in total. This marks an increase of $\sim36\%$ (109/298) to the known population at these redshifts and magnitudes, while we further are able to retain a selection efficiency of $\sim80\%$. On the basis of 166 quasars from the full ELQS quasar catalog, who adhere to the uniform criteria of the 2MASS point source catalog, we measure the bright-end quasar luminosity function (QLF) and extend it one magnitude brighter than previous studies. Assuming a single power law with exponential density evolution for the functional form of the QLF, we retrieve the best fit parameters from a maximum likelihood analysis. We find a steep bright-end slope of $\beta\approx-4.1$ and we can constrain the bright-end slope to $\beta\leq-3.4$ with $99\%$ confidence. The density is well modeled by the exponential redshift evolution, resulting in a moderate decrease with redshift ($\gamma\approx-0.4$). Comment: 30 pages, 11 figures, ApJ accepted |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-4357/aaf86c |
| URL الوصول: | http://arxiv.org/abs/1812.04639 |
| رقم الأكسشن: | edsarx.1812.04639 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-4357/aaf86c |
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