Results 111 to 120 of about 110,927 (295)

Radio Properties of z>4 Optically-Selected Quasars [PDF]

, 2000
We report on two programs to address differential evolution between the radio-loud and radio-quiet quasar populations at high (z>4) redshift. Both programs entail studying the radio properties of optically-selected quasars.
Daniel Stern, Goldschmidt P., Hook I. M., J. V. Wall, McMahon R. G., Miller L., Miller P., Peacock J. A., R. A. Perley, Reinaldo R. de Carvalho, S. G. Djorgovski, Shaver P. A., Zickgraf F.-J.   +12 more
core   +2 more sources

BAL and non-BAL quasars: continuum, emission, and absorption properties establish a common parent sample [PDF]

Monthly notices of the Royal Astronomical Society, 2019
Using a sample of ≃144 000 quasars from the Sloan Digital Sky Survey Data Release 14, we investigate the outflow properties, evident in both absorption and emission, of high-ionization broad absorption line (BAL) and non-BAL quasars with redshifts 1.6 ≲
A. Rankine, P. Hewett, M. Banerji, G. Richards   +3 more
semanticscholar   +1 more source

Effect of MgO and Al2O3 precursors on 3D‐printed cordierite lattice structures by a novel emulsion‐based PDC route

Journal of the American Ceramic Society, Volume 108, Issue 12, December 2025.
Development of cordierite lattice structures from DIW of silicone‐based emulsions, in multiple forms (aqueous phase as suspension of oxide nanoparticles, as solution of Mg and Al salts, or as solution/suspension). Abstract The development of advanced ceramic materials with tailored microstructures is essential for meeting the demands of many high ...
Valeria Diamanti, Hamada Elsayed, Tobias Fey, Enrico Bernardo   +3 more
wiley   +1 more source

AllBRICQS: The Discovery of Luminous Quasars in the Northern Hemisphere

The Astrophysical Journal Supplement Series
We present the second catalog of bright quasars from the All-sky BRIght, Complete Quasar Survey (AllBRICQS), focusing on spectroscopically observed quasars in the Northern Hemisphere with Galactic latitude ∣ b ∣ > 10°.
Yunyi Choi, Yuming Fu, Myungshin Im, Xue-Bing Wu, Christopher A. Onken, Christian Wolf, Seo-Won Chang, Hyeonho Choi, Mankeun Jeong, Yongjung Kim, Gu Lim, Yuxuan Pang, Taewan Kim, Jubee Sohn, Dohyeong Kim, Ji Hoon Kim, Eunhee Ko, Gregory S. H. Paek, Sungho Jung   +18 more
doaj   +1 more source

Discovery of six high-redshift quasars with the Lijiang 2.4m telescope and the Multiple Mirror Telescope

, 2012
Quasars with redshifts greater than 4 are rare, and can be used to probe the structure and evolution of the early universe. Here we report the discovery of six new quasars with $i$-band magnitudes brighter than 19.5 and redshifts between 2.4 and 4.6 from
Chen-Wei Yang, Constantin, Fan, Fan, Hong-Yan Zhou, Hu, Kong, Markwardt, Peng Jiang, Qian Yang, Richards, Richards, Schlegel, Schneider, Shen, Su, Tsuzuki, Vestergaard, Vestergaard, Wei-Min Yi, Wen-Juan Liu, Wen-Wen Zuo, Wright, Wu, Wu, Wu, Wu, Wu, Wu, Wu, Xin-Wen Shu, Xue-Bing Wu, York, Zhao   +33 more
core   +1 more source

Obscured and unobscured active galactic nuclei in the Spitzer Space Telescope First Look Survey [PDF]

, 2004
Selection of active galactic nuclei (AGN) in the infrared allows the discovery of AGN whose optical emission is extinguished by dust. In this paper, we use the Spitzer Space Telescope First Look Survey (FLS) to assess what fraction of AGN with mid ...
A. Sajina, B. T. Soifer, Bolzonella M., D. Fadda, D. L. Shupe, D. T. Frayer, Efstathiou A., F. Fang, F. Masci, F. R. Marleau, G. Helou, G. Wilson, H. I. Teplitz, I. Heinrichsen, J. Surace, L. Armus, L. J. Storrie‐Lombardi, L. Yan, Laurent O., Lawrence A., M. Im, M. Lacy, P. I. Choi, P. N. Appleton, S. C. Chapman   +24 more
core   +3 more sources

Resolving discs and mergers in z ∼ 2 heavily reddened quasars and their companion galaxies with ALMA [PDF]

, 2021
M. Banerji, Gareth C. Jones, Stefano Carniani, Colin DeGraf, Jeff Wagg   +4 more
openalex   +1 more source

Exploring Reionization-era Quasars. IV. Discovery of Six New z ≳ 6.5 Quasars with DES, VHS, and unWISE Photometry [PDF]

Astronomical Journal, 2018
This is the fourth paper in a series of publications aiming at discovering quasars at the epoch of reionization. In this paper, we expand our search for z ∼ 7 quasars to the footprint of the Dark Energy Survey (DES) Data Release One (DR1), covering ∼5000
Jinyi Yang, Feige Wang, Xiaohui Fan, M. Yue, Xue-bing Wu, Jiangtao Li, F. Bian, Linhua Jiang, E. Bañados, Y. Beletsky   +9 more
semanticscholar   +1 more source

Performance evaluation of a second‐generation O‐ring‐shaped image‐guided radiotherapy system with a gimbal‐mounted linear accelerator and real‐time tracking capabilities

Journal of Applied Clinical Medical Physics, Volume 26, Issue 11, November 2025.
Abstract Purpose OXRAY, a state‐of‐the‐art radiation therapy system commercialized by Hitachi High‐Tech Ltd. in 2023, integrates unique beam delivery and image‐guided radiation therapy (IGRT) technologies as the successor to Vero4DRT. This study evaluated the performance of this second‐generation O‐ring‐shaped linear accelerator. Methods The percentage
Kohei Kawata, Yukako Kishigami, Hideaki Hirashima, Yohei Sawada, Maika Urago, Takahiro Fujimoto, Tetsuo Fukuda, Takashi Mizowaki, Mitsuhiro Nakamura   +8 more
wiley   +1 more source

X-ray Observations of Gravitationally Lensed Quasars; Evidence for a Hidden Quasar Population [PDF]

, 1999
The large magnification factors of gravitationally lensed (GL) systems allow us to investigate the properties of quasars with X-ray luminosities that are substantially lower than those of unlensed ones and also provide an independent means of estimating ...
Bade N., Brinkmann W., Courbin F., G. Chartas, Kormann R., Patnaik A. R., Reeves J. N., Reimers D., Schartel N., Smette A., Tinney C. G., Yuan W.   +11 more
core   +2 more sources