The growing threat of light pollution to ground-based observatories

Autor: Richard F. Green, Christian B. Luginbuhl, Richard J. Wainscoat, Dan Duriscoe

Publikováno v: The Astronomy and Astrophysics Review. 30

Human activity is rapidly increasing the negative impact of artificial skyglow at even the most remote professional observatory sites. Assessment of the actual impact requires an understanding of the propagation as a function of source spectral energ

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1b997f2062c73a14bbd56d2d62c55d70
https://doi.org/10.1007/s00159-021-00138-3

The properties of broad absorption line outflows based on a large sample of quasars

Autor: Zhicheng He, Wei-Hao Bian, Hongyan Zhou, Richard F. Green, Kirill Tchernyshyov, Youhua Xu, Guilin Liu, Tinggui Wang, Guobin Mou, Huiyuan Wang, Jun Xu

Publikováno v: Nature Astronomy. 3:265-271

Quasar outflows carry mass, momentum and energy into the surrounding environment, and have long been considered a potential key factor in regulating the growth of supermassive black holes and the evolution of their host galaxies. A crucial parameter

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::752bb615ebd8c709635b3854c0c73322
https://doi.org/10.1038/s41550-018-0669-8

P\={o}niu\={a}'ena: A Luminous $z=7.5$ Quasar Hosting a 1.5 Billion Solar Mass Black Hole

Autor: Emanuele Paolo Farina, Fabian Walter, Roberto Decarli, Chiara Mazzucchelli, Fuyan Bian, Eduardo Bañados, Joseph F. Hennawi, Xue-Bing Wu, Jiang-Tao Li, Minghao Yue, Jinyi Yang, Bram Venemans, Richard F. Green, Konstantina Boutsia, Frederick B. Davies, Linhua Jiang, Xiaohui Fan, Feige Wang, Aaron J. Barth

We report the discovery of a luminous quasar, J1007+2115 at $z=7.515$ ("P\={o}niu\={a}'ena"), from our wide-field reionization-era quasar survey. J1007+2115 is the second quasar now known at $z>7.5$, deep into the reionization epoch. The quasar is po

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::622eb0536b1c9f1fba43d1c382b44c65
http://arxiv.org/abs/2006.13452

CIV emission line properties and uncertainties in black hole mass estimates of z ~ 3.5 quasars

Autor: Andreas Schulze, Fuyan Bian, Ran Wang, Xiaohui Fan, Weiming Yi, Richard F. Green, Xue-Bing Wu, Wenwen Zuo

Using a high luminosity ($L_{\rm bol} \sim 10^{47.5} - 10^{48.3}$ erg s$^{-1}$), high redshift ($3.2 < z < 3.8$) quasar sample of 19 quasars with optical and near-infrared spectroscopy, we investigate the reliability of the CIV-based black hole mass

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::21180b1bc740d773d66f122029f0c215

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

Autor: Ian D. McGreer, Jinyi Yang, Minghao Yue, Xiaohui Fan, Jennifer Kadowaki, Johan P. U. Fynbo, Feige Wang, Jens Kristian Krogager, E. M. Green, Jan-Torge Schindler, Yun Hsin Huang, Anna Patej, Ya-Lin Wu, Richard F. Green

Publikováno v: The Astrophysical Journal
Schindler, J-T, Fan, X, McGreer, I D, Yang, J, Wang, F, Green, R, Fynbo, J P U, Krogager, J-K, Green, E M, Huang, Y-H, Kadowaki, J, Patej, A, Wu, Y-L & Yue, M 2019, ' 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 ', Astrophysical Journal, vol. 871, no. 2, 258 . https://doi.org/10.3847/1538-4357/aaf86c

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-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::de4e44fe0fcc13676b6991aca89f548c
https://hdl.handle.net/21.11116/0000-0005-CFD6-1