Results 61 to 70 of about 94,086 (264)

Detecting and Characterizing Young Quasars. I. Systemic Redshifts and Proximity Zone Measurements

Astrophysical Journal, 2020
In a multiwavelength survey of 13 quasars at 5.8 ≲ z ≲ 6.5, which were preselected to be potentially young, we find five objects with extremely small proximity zone sizes that may imply UV-luminous quasar lifetimes of ≲100,000 yr.
A. Eilers, J. Hennawi, R. Decarli, F. Davies, B. Venemans, F. Walter, E. Bañados, Xiaohui Fan, E. Farina, C. Mazzucchelli, M. Novak, J. Schindler, R. Simcoe, Feige Wang, Jinyi Yang   +14 more
semanticscholar   +1 more source

Changing-look Quasar Candidates: First Results from Follow-up Spectroscopy of Highly Optically Variable Quasars [PDF]

Astrophysical Journal, 2018
Active galactic nuclei (AGNs) that show strong rest-frame optical/UV variability in their blue continuum and broad line emission are classified as changing-look AGN, or at higher luminosities, changing-look quasars (CLQs).
C. MacLeod, P. Green, S. Anderson, A. Bruce, M. Eracleous, M. Graham, D. Homan, A. Lawrence, Amy Lebleu, N. Ross, J. Ruan, J. Runnoe, D. Stern, W. Burgett, K. Chambers, N. Kaiser, E. Magnier, N. Metcalfe   +17 more
semanticscholar   +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

New Superluminal Quasars [PDF]

Symposium - International Astronomical Union, 1986
Since 1977 we have been engaged on a project to survey the milliarcsecond structure and internal motions of a complete, unbiased sample of 65 radio sources (Pearson and Readhead 1984). One of the goals of the project was to discover more superluminal sources and find out how common they are.
T. J. Pearson, P. D. Barthel, A. C. S. Readhead, C. R. Lawrence   +3 more
openaire   +1 more source

Material Strategies for Stimulation and Recording in Neural Biocomputing Platforms

Advanced Electronic Materials, EarlyView.
Material strategies enabling stimulation and recording are central to neural biocomputing systems. This review examines how electronic materials govern the encoding of inputs and decoding of outputs in living neural networks. Advances in electrical, optical, and multimodal interfaces highlight emerging design principles for biocomputing platforms ...
Sehong Kang, Junggeon Park, Aryaman Joshi, Rakid Haque, Gyu Weon Hwang, Hyunjoon Kong   +5 more
wiley   +1 more source

X-ray Insights into the Nature of Quasars with Redshifted Broad Absorption Lines

, 2017
We present $Chandra$ observations of seven broad absorption line (BAL) quasars at $z=0.863$-2.516 with redshifted BAL troughs (RSBALs). Five of our seven targets were detected by $Chandra$ in 4-13 ks exposures with ACIS-S. The $\alpha_{\rm ox}$ values, $\
Ahmed, N. S., Ak, N. Filiz, Anderson, Scott F., Brandt, W. N., Hall, P. B., Luo, B., Petitjean, P., Schneider, D. P., Shen, Yue, Srianand, R., Zhang, Ning-Xiao   +10 more
core   +3 more sources

Minimalist Footwear Acutely Alters Running Kinematics in Runners With Medial Tibial Stress Syndrome

Arthroscopy, Sports Medicine, and Rehabilitation, EarlyView.
Purpose To assess immediate biomechanical changes in runners with medial tibial stress syndrome (MTSS) when transitioning from standard to minimalist running shoes. Methods Active runners diagnosed with MTSS ran on a treadmill at 10 km/h using standard and minimalist running shoes. Hip, knee, and ankle joint kinematics were captured using a 16‐infrared‐
Quyet Thang Nguyen, My T. Than, Minh Ho Ngoc, Ngoc‐Tram Nguyen, Nam Vu Tu, Tien Quang Tran, Dung Tran Trung   +6 more
wiley   +1 more source

Red Type-1 Quasars after Cosmic Noon and Impact on L UV-related Quasar Statistics

The Astrophysical Journal
Over the past decades, nearly a million quasars have been explored to shed light on the evolution of supermassive black holes and galaxies. The ultraviolet-to-optical spectra of type-1 quasars particularly offer insights into their black hole activities.
Yongjung Kim, Dohyeong Kim, Myungshin Im, Minjin Kim   +3 more
doaj   +1 more source

Physical Properties of 15 Quasars at z ≳ 6.5 [PDF]

, 2017
Quasars are galaxies hosting accreting supermassive black holes; due to their brightness, they are unique probes of the early universe. To date, only a few quasars have been reported at (
C. Mazzucchelli, E. Bañados, E. Bañados, B. Venemans, R. Decarli, E. Farina, F. Walter, A. Eilers, H. Rix, R. Simcoe, D. Stern, Xiaohui Fan, E. Schlafly, G. D. Rosa, J. Hennawi, J. Hennawi, K. Chambers, J. Greiner, W. Burgett, P. Draper, N. Kaiser, R. Kudritzki, E. Magnier, N. Metcalfe, C. Waters, R. Wainscoat   +25 more
semanticscholar   +1 more source

Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). X. Discovery of 35 Quasars and Luminous Galaxies at 5.7 ≤ z ≤ 7.0 [PDF]

Astrophysical Journal, 2019
We report the discovery of 28 quasars and 7 luminous galaxies at 5.7 ≤ z ≤ 7.0. This is the tenth in a series of papers from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, which exploits the deep multiband imaging data ...
Y. Matsuoka, K. Iwasawa, M. Onoue, N. Kashikawa, M. Strauss, Chien-Hsiu Lee, M. Imanishi, T. Nagao, M. Akiyama, N. Asami, J. Bosch, H. Furusawa, T. Goto, J. Gunn, Y. Harikane, H. Ikeda, T. Izumi, T. Kawaguchi, N. Kato, S. Kikuta, K. Kohno, Y. Komiyama, S. Koyama, R. Lupton, T. Minezaki, S. Miyazaki, Hitoshi Murayama, M. Niida, A. Nishizawa, Akatoki Noboriguchi, M. Oguri, Y. Ono, M. Ouchi, P. Price, H. Sameshima, A. Schulze, J. Silverman, N. Sugiyama, Philip J. Tait, M. Takada, T. Takata, Masayuki Tanaka, Ji-Jia Tang, Y. Toba, Y. Utsumi, Shiang‐Yu Wang, T. Yamashita   +46 more
semanticscholar   +1 more source