Results 101 to 110 of about 221,703 (328)

XMM-Newton Observations of High Redshift Quasars

, 2005
We report on our XMM observations of the high redshift quasars BR 2237--0607 (z=4.558) and BR 0351--1034 (z=4.351), together with 14 other z>4 objects found in the XMM public archive.
B. Wilkes, Brandt W. N., Brinkmann W., D. Grupe, Fabian A. C., Hasinger G., Isaak K. G., P. Osmer, Pfeffermann E., S. Mathur, Voges W., Yuan W., Yuan W., Zickgraf F.-J.   +13 more
core   +3 more sources

RoHS‐Compliant, Cu‐Zn‐In‐Se‐Based Core/Multi‐shell Quantum Dots with Efficient and Tunable Short‐Wave Infrared Emission

Advanced Functional Materials, EarlyView.
An innovative combination of size‐controlled template synthesis, partial cation exchange reactions, and dual shell passivation offers a new class of RoHS‐compliant, heavy metal‐free Cu‐Zn‐In‐Se/ZnS/Al2O3 core/shell/shell quantum dots (QDs), exhibiting long‐range tunability, highly efficient SWIR emission with remarkably narrow photoluminescence ...
Avijit Saha, Morena Cervino, Hossein Roshan, René Hübner, Angelika Wrzesińska‐Lashkova, Christine Steinbach, Yana Vaynzof, Francesco Di Stasio, Vladimir Lesnyak   +8 more
wiley   +1 more source

Non-Doppler Redshift and Redshifts of QSOs

, 2013
Quasars have reigned as the most luminous and distant objects in the Universe. These concepts were based on the hypothesis that the redshifts of quasars are obeying the Hubble low. This hypothesis has little serious competition today, but has met some difficulties when using it to determine the distances of quasars.
openaire   +2 more sources

Self‐Trapped Hole Migration and Defect‐Mediated Thermal Quenching of Luminescence in α‐ and β‐Ga2O3

Advanced Functional Materials, EarlyView.
Temperature‐dependent photoluminescence and first‐principles calculations reveal self‐trapped hole migration as the microscopic origin of thermal quenching in α‐ and β‐Ga2O3. The low migration barrier in α‐Ga2O3 enables defect trapping and enhances blue luminescence, while the higher barrier in β‐Ga2O3 preserves ultraviolet emission at elevated ...
Nima Hajizadeh, Ymir K. Frodason, Clemens Petersen, Benjamin M. Janzen, Luca Sung‐Min Choi, Nils Bernhardt, Felix Nippert, Zbigniew Galazka, Joel B. Varley, Holger von Wenckstern, Lasse Vines, Markus R. Wagner   +11 more
wiley   +1 more source

On the Number of Galaxies at High Redshift

Galaxies, 2015
The number of galaxies at a given flux as a function of the redshift, z, is derived when the z-distance relation is non-standard. In order to compare different models, the same formalism is also applied to the standard cosmology.
Lorenzo Zaninetti
doaj   +1 more source

Maximum amplitude of the high-redshift 21-cm absorption feature [PDF]

, 2020
Pablo Villanueva-Domingo, Olga Mena, Jordi Miralda‐Escudé   +2 more
openalex   +1 more source

Do star formation rates of galaxy clusters depend on mass?: blue/late-type fractions, total star formation rates of 115 galaxy clusters as a function of cluster virial mass

, 2004
There has been plenty of observational evidence of cluster galaxy evolution such as the Butcher-Oemler effect and the decrease in S0 fraction with increasing redshift.
Goto, Tomotsugu
core   +1 more source

Thermoplasmonic Nanorings for Passive Solar‐Responsive Smart Windows in Energy‐Efficient Building Applications

Advanced Functional Materials, EarlyView.
This work presents scalable silver nanorings with tunable thermoplasmonic properties for smart window applications. By responding to sunlight and environmental changes, the nanorings modulate near‐infrared light and reduce heat transmission. Their unique geometry enables dynamic optical control, offering a promising route toward energy‐efficient ...
Xavier Baami González, Duncan S. Sutherland   +1 more
wiley   +1 more source

Tomographic Magnification of Lyman Break Galaxies in The Deep Lens Survey

, 2012
Using about 450,000 galaxies in the Deep Lens Survey, we present a detection of the gravitational magnification of z > 4 Lyman Break Galaxies by massive foreground galaxies with 0.4 < z < 1.0, grouped by redshift.
A. Choi, Albrecht, B. Ménard, Bartelmann, Bauer, Benítez, Bertin, Bouwens, C. B. Morrison, Choi, Coe, Coil, Coleman, D. M. Wittman, Eisenstein, Glikman, Guhathakurta, Hartlap, Hildebrandt, Hildebrandt, Hoekstra, Ilbert, J. A. Tyson, Jain, Jullo, Landy, Le Fèvre, Mandelbaum, Matthews, Muller, Ménard, Ménard, Narayan, Newman, Padmanabhan, Peebles, Pogge, R. Ryan, R. Scranton, S. J. Schmidt, Sawicki, Schlegel, Schmidt, Schrabback, Scranton, Scranton, Seljak, Sheth, Simon, Steidel, van der Burg, van Waerbeke, Wake, Wang, Wittman, Wittman, Wittman, Zheng, Zheng   +58 more
core   +1 more source

Spectrally Tunable 2D Material‐Based Infrared Photodetectors for Intelligent Optoelectronics

Advanced Functional Materials, EarlyView.
Intelligent optoelectronics through spectral engineering of 2D material‐based infrared photodetectors. Abstract The evolution of intelligent optoelectronic systems is driven by artificial intelligence (AI). However, their practical realization hinges on the ability to dynamically capture and process optical signals across a broad infrared (IR) spectrum.
Junheon Ha, Yingshan Ma, Yong Nam An, Sung‐Un An, Hyeon Hak Jung, Suvi‐Tuuli Varjamo, Jiwon Yoo, Junho Min, Hanvit Kim, Faisal Ahmed, Sang Hoon Chae, Young Min Song, Weiwei Cai, Tawfique Hasan, Zhipei Sun, Dong‐Ho Kang, Hyeon‐Jin Shin, Yunyun Dai, Hoon Hahn Yoon   +18 more
wiley   +1 more source