Results 51 to 60 of about 18,849 (212)

Supermassive Binaries and Extragalactic Jets [PDF]

, 1996
Some quasars show Doppler shifted broad emission line peaks. I give new statistics of the occurrence of these peaks and show that, while the most spectacular cases are in quasars with strong radio jets inclined to the line of sight, they are also almost ...
A. Alberdi, A. Boksenberg, A. Soltan, A.M. Dumont, A.P. Koratkar, A.P. Koratkar, A.R. Sandage, A.R.S. Black, A.V. Filippenko, B. Reipurth, B.J. Wills, B.J. Wills, B.J. Wills, B.J. Wills, B.M. Peterson, C.M. Gaskell, C.M. Gaskell, C.M. Gaskell, C.M. Gaskell, C.M. Gaskell, C.M. Gaskell, C.M. Gaskell, C.M. Gaskell, D Maoz, D. Alloin, D. Golombek, D. Lynden-Bell, D.B. Shaffer, D.E. Osterbrock, D.E. Osterbrock, D.E. Osterbrock, D.E. Osterbrock, D.M. Crenshaw, D.P. Whitmire, Duquennoy, E. Perez, E.I. Rosenblatt, E.M. Burbidge, E.R. Capriotti, Eracleous, F. Governato, F.Z. Cheng, G. Ghisellini, G. Giuricin, G. Giuricin, G. Stirpe, G. Stirpe, G. Xu, G. Zotti De, G.J. Ferland, G.K. Miley, G.K. Miley, G.R. Blumenthal, G.W. Collins II, H.C. Ford, H.E. Smith, H.K.C. Yee, I. Wanders, I. Wanders, I. Wanders, J. B. Oke, J. Clavel, J. Kormendy, J. Kormendy, J. Makino, J.A. Baldwin, J.B. Hutchings, J.B. Hutchings, J.E. Conway, J.E. Conway, J.E. Conway, J.J. Lu, J.L. Tonry, J.M. Mazzarella, J.M. Shuder, J.M. Shuder, J.P. Halpern, J.P. Halpern, J.S. Miller, J.W. Sulentic, J.W. Sulentic, K. Chen, K. Chen, K. Korista, K.S. Anderson, Komberg, L. Woltjer, M. Eracleous, M. Valtonen, M.C. Begelman, M.J. Disney, M.S. Brotherton, N. Roos, N. Roos, N. Roos, P. Marziani, P. Marziani, R. Lynds, R. Zamir, R.D. Ekers, R.H. Miller, R.P. Norris, R.R.J. Antonucci, R.R.J. Antonucci, R.W. Hunstead, S. Collin, S. Collin-Souffrin, S. Veilleux, S. Veilleux, S.A. Grandi, S.M. Simkin, W. Kundt, W. Kundt, W. Kundt, W. Wamsteker, W. Zheng, W. Zheng, W. Zheng, W.C. Keel, W.C. Keel, W.C. Saslaw, W.G. Mathews, W.G. Mathews, W.G. Mathews, W.G. Mathews   +124 more
core   +4 more sources

First In Vivo 23Na Human Imaging at 10.5 T Using a Combined Sodium‐Proton Transceiver Body Array

Magnetic Resonance in Medicine, Volume 95, Issue 4, Page 2429-2441, April 2026.
ABSTRACT Purpose To demonstrate the first in vivo human 23Na MRI at 10.5 T using a novel dual‐tuned transceiver body array and to evaluate a self‐gating approach for respiratory motion compensation, focusing on renal imaging. Methods A custom‐built eight‐channel 23Na‐loop 1H‐dipole transceiver array was designed, constructed, and characterized.
Simon Schmidt, Arcan M. Ertürk, Gregory J. Metzger   +2 more
wiley   +1 more source

HST Confirms Sub-5 kpc Dual Quasar Pairs at Cosmic Noon

The Astrophysical Journal
During cosmic noon ( z ∼ 1–3), when both star formation and black hole growth peaked, galaxy mergers are predicted to trigger dual active galactic nuclei that eventually coalesce as supermassive black hole (SMBH) binaries.
Qian Wang, Xuheng Ding, John Silverman, J. Xavier Prochaska, Tommaso Treu, Hassen M. Yesuf, Andrew D. Goulding, Masatoshi Imanishi, Nobunari Kashikawa, Issha Kayo, Kotaro Kohno, Kai Liao, Yoshiki Matsuoka, Michael A. Strauss, Shenli Tang   +14 more
doaj   +1 more source

Identification of Outflows and Candidate Dual Active Galactic Nuclei in SDSS Quasars at z=0.8-1.6 [PDF]

, 2013
We present a sample of 131 quasars from the Sloan Digital Sky Survey at redshifts 0 ...
Barrows, R. Scott, Berrier, Joel C., Comerford, Julia M., Kennefick, Daniel, Kennefick, Julia, Lacy, Claud H. Sandberg   +5 more
core   +2 more sources

Commissioning and clinical implementation of an MLC tracking system: An evaluation of AAPM TG‐264 guidelines

Journal of Applied Clinical Medical Physics, Volume 27, Issue 3, March 2026.
Abstract Background Precise radiotherapy relies on accurately targeting tumours while minimising exposure to healthy tissue, yet patient and organ motion complicate treatment delivery. To address intra‐fractional motion, multi‐leaf collimator (MLC) tracking systems have recently been adopted, adapting beam shapes in real‐time.
André Haraldsson, Tobias Pommer, Emilia Persson, Hedda Enocsson, Mustafa Kadhim, Adalsteinn Gunnlaugsson, Per Munck af Rosenschöld   +6 more
wiley   +1 more source

A Close Quasar Pair in a Massive Galaxy Merger at z = 5.7

The Astrophysical Journal Letters
Close quasar pairs are rare products of galaxy mergers in which both supermassive black holes (SMBHs) are actively accreting, offering strong constraints on merger-driven active galactic nuclei evolution.
Minghao Yue, Xiaohui Fan, Anna-Christina Eilers, Feige Wang, Jinyi Yang, Robert A. Simcoe   +5 more
doaj   +1 more source

Constraining Sub-Parsec Binary Supermassive Black Holes in Quasars with Multi-Epoch Spectroscopy. II. The Population with Kinematically Offset Broad Balmer Emission Lines [PDF]

, 2014
A small fraction of quasars have long been known to show bulk velocity offsets in the broad Balmer lines with respect to the systemic redshift of the host galaxy.
Bian, Fuyan, Liu, Xin, Loeb, Abraham, Shen, Yue, Tremaine, Scott   +4 more
core   +2 more sources

Anisotropy Analysis of Bamboo and Tooth Using 4‐Angle Polarization Micro‐Spectroscopy

Nano Select, Volume 7, Issue 3, March 2026.
Super‐resolution via orientation: spatial distribution of specific molecular vibrations are revealed at 1/20 of the diffraction limit. ABSTRACT To investigate the anisotropic properties of biomaterials, two distinct classes are considered as follows: polymer‐based (cellulose in plants) and crystalline‐based (enamel in teeth), each demonstrating ...
Meguya Ryu, Hsin‐Hui Huang, Jitraporn Vongsvivut, Soon Hock Ng, Irma Dumbrytė, Donatas Narbutis, Mangirdas Malinauskas, Saulius Juodkazis, Junko Morikawa   +8 more
wiley   +1 more source

Superluminal motion in the double-lobed quasar 3C 245

The Astrophysical Journal, 1987
VLBI observations of 3C 245 obtained at 10.7 GHz with the Mark III array at five epochs in 1981-1986 are reported. The data-reduction and model-fitting procedures are explained, and the results are presented in tables, graphs, and maps along with previously published data on 11 other superluminal sources. The central component of the quasar is found to
D. H. Hough, A. C. S. Readhead
openaire   +1 more source

Flame Retardant Polyolefins Using Fibers From Leather Waste: Adjusting Extrusion Variables to Balance the Property Profile

Journal of Vinyl and Additive Technology, Volume 32, Issue 2, Page 410-430, March 2026.
Adjusting extrusion variables are a key to balance the flame retardancy and mechanical properties of polyolefin/leather waste fiber composites. ABSTRACT The extrusion processing variables represent a key to the optimal use of additives and thus the development of flame‐retardant polymer composites. Adjusting the property profile, for example, finding a
Guadalupe Sanchez‐Olivares, Sven Brehme, Fausto Calderas, Bernhard Schartel   +3 more
wiley   +1 more source