Results 51 to 60 of about 17,110 (224)

Impact of Radio-mode Feedback on the Covering Fraction of the Circumgalactic Medium of Quasars

The Astrophysical Journal
Utilizing data from the Low-Frequency Array Two-meter Sky Survey and the Sloan Digital Sky Survey, we assemble a sample of 1469 projected quasar pairs with detected radio emissions from foreground quasars, as well as a control sample of 5846 pairs ...
Wen-Qiang Liang, Zhi-fu Chen, Rui-Jing Lu, Jing Li, Zhe-Geng Chen   +4 more
doaj   +1 more source

Shedding New Light on Weak Emission-line Quasars in the C iv–Hβ Parameter Space

The Astrophysical Journal, 2023
Weak emission-line quasars (WLQs) are a subset of type 1 quasars that exhibit extremely weak Ly α + N v λ 1240 and/or C iv λ 1549 emission lines. We investigate the relationship between emission-line properties and accretion rate for a sample of 230 ...
Trung Ha, Cooper Dix, Brandon M. Matthews, Ohad Shemmer, Michael S. Brotherton, Adam D. Myers, Gordon T. Richards, Jaya Maithil, Scott F. Anderson, W. N. Brandt, Aleksandar M. Diamond-Stanic, Xiaohui Fan, S. C. Gallagher, Richard Green, Paulina Lira, Bin Luo, Hagai Netzer, Richard M. Plotkin, Jessie C. Runnoe, Donald P. Schneider, Michael A. Strauss, Benny Trakhtenbrot, Jianfeng Wu   +22 more
doaj   +1 more source

Dynamic Regulation of Endogenous Transcription Factor Hubs at Single‐Molecule Resolution

Advanced Science, Volume 13, Issue 52, 18 September 2026.
This study combines single‐molecule microscopy and genome editing to characterize the dynamic behaviors of endogenous oncofusion transcription factor EWS::FLI1 in Ewing sarcoma cells. EWS::FLI1 forms neomorphic hubs that dynamically assemble and dissolve. The hubs are regulated during mitosis, by RNA, and by specific chemicals.
Shawn Yoshida, Yanghao Zhong, Akiko Kumagai, William G. Dunphy, Shasha Chong   +4 more
wiley   +1 more source

The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Releases 10 to 12

The Astrophysical Journal Supplement Series
We present the quasar catalog from Data Releases 10 to 12 of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey, comprising quasars observed between 2021 September and 2024 June. We robustly identified 11,346 quasars, of
Bing Lyu, Xue-Bing Wu, Jun-Jie Jin, Yuming Fu, Yuxuan Pang, Huimei Wang, Rui Zhu, Su Yao, Yan-Li Ai, Yan-xia Zhang, Hai-long Yuan, Zhi-ying Huo   +11 more
doaj   +1 more source

Circum-Galactic Medium in the Halo of Quasars

Frontiers in Astronomy and Space Sciences, 2017
The properties of circum-galactic gas in the halo of quasar host galaxies are investigated analyzing Mg II 2800 and C IV 1540 absorption-line systems along the line of sight close to quasars.
Riccardo Ottolina, Renato Falomo, Aldo Treves, Michela Uslenghi, Jari K. Kotilainen, Riccardo Scarpa, Emanuele Paolo Farina   +6 more
doaj   +1 more source

Quasar Luminosity Function at z = 7

The Astrophysical Journal Letters, 2023
We present the quasar luminosity function (LF) at z = 7, measured with 35 spectroscopically confirmed quasars at 6.55 < z < 7.15. The sample of 22 quasars from the Subaru High- z Exploration of Low-Luminosity Quasars (SHELLQs) project, combined with 13 ...
Yoshiki Matsuoka, Masafusa Onoue, Kazushi Iwasawa, Michael A. Strauss, Nobunari Kashikawa, Takuma Izumi, Tohru Nagao, Masatoshi Imanishi, Masayuki Akiyama, John D. Silverman, Naoko Asami, James Bosch, Hisanori Furusawa, Tomotsugu Goto, James E. Gunn, Yuichi Harikane, Hiroyuki Ikeda, Kohei Inayoshi, Rikako Ishimoto, Toshihiro Kawaguchi, Satoshi Kikuta, Kotaro Kohno, Yutaka Komiyama, Chien-Hsiu Lee, Robert H. Lupton, Takeo Minezaki, Satoshi Miyazaki, Hitoshi Murayama, Atsushi J. Nishizawa, Masamune Oguri, Yoshiaki Ono, Taira Oogi, Masami Ouchi, Paul A. Price, Hiroaki Sameshima, Naoshi Sugiyama, Philip J. Tait, Masahiro Takada, Ayumi Takahashi, Tadafumi Takata, Masayuki Tanaka, Yoshiki Toba, Shiang-Yu Wang, Takuji Yamashita   +43 more
doaj   +1 more source

Comparative Effectiveness Analysis of Phase 3 Clinical Trials in Moderately to Severely Active Inflammatory Bowel Disease Reveals Increased Harm From Placebo and Challenges Equipoise

JCC Plus, Volume 1, Issue 5, September 2026.
Across 47 Phase 3 trials in Crohn's disease and ulcerative colitis, placebo exposure was associated with measurable harm. Disease exacerbation events showed the greatest excess risk, with one additional exacerbation occurring for every 8–13 patients assigned to placebo rather than active therapy.
Joëlle St‐Pierre, Zachary D. Fine, Evan N. Fear, Jeremy A. Klein, Natalie K. Choi, David T. Rubin   +5 more
wiley   +1 more source

Spectral energy distribution modelling of broad emission line quasars: From X-ray to radio wavelengths

Astronomy & Astrophysics
Aims. We study differences in the physical properties of quasar host galaxies using an optically selected sample of radio-loud (RL) and radio-quiet quasars (in the redshift range 0.15 ≤ z ≤ 1.9) that we have further cross-matched with the VLA-FIRST ...
Chakraborty Avinanda, Kundu Maitreya, Chatterjee Suchetana, Panda Swayamtrupta, Sar Arijit, Jaison Sandra, Chatterjee Ritaban   +6 more
doaj   +1 more source

Efficacy of Advanced Medical Therapies in Patients With Moderately to Severely Active Ulcerative Colitis: A Systematic Review and Meta‐Analysis

JCC Plus, Volume 1, Issue 5, September 2026.
This systematic review and meta‐analysis quantify absolute outcome differences of advanced therapies in moderate‐to‐severe ulcerative colitis, demonstrating significant benefits in clinical, endoscopic, and histological remission, and establishing a benchmark for evaluating novel or non‐pharmacological treatment strategies.
E. Visser, I. D. van Dijk, G. L. Burchell, W. A. Bemelman, G. R. D'Haens, C. J. Buskens   +5 more
wiley   +1 more source

“Quasars: physical and evolutionary properties“ [PDF]

, 2023
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