scholarly journals Dissecting the IRX–β dust attenuation relation: exploring the physical origin of observed variations in galaxies

2017 ◽  
Vol 472 (2) ◽  
pp. 2315-2333 ◽  
Author(s):  
Gergö Popping ◽  
Annagrazia Puglisi ◽  
Colin A. Norman
Keyword(s):  
Attenuation Relation ◽  
Physical Origin ◽  
Dust Attenuation

scholarly journals The IRX–β dust attenuation relation in cosmological galaxy formation simulations

2017 ◽  
Vol 474 (2) ◽  
pp. 1718-1736 ◽  
Author(s):  
Desika Narayanan ◽  
Romeel Davé ◽  
Benjamin D. Johnson ◽  
Robert Thompson ◽  
Charlie Conroy ◽  
...  
Keyword(s):  
Galaxy Formation ◽  
Attenuation Relation ◽  
Dust Attenuation

scholarly journals Dependence of the IRX-β Dust Attenuation Relation on Metallicity and Environment

2020 ◽  
Vol 903 (2) ◽  
pp. L28
Author(s):  
Irene Shivaei ◽  
Behnam Darvish ◽  
Zahra Sattari ◽  
Nima Chartab ◽  
Bahram Mobasher ◽  
...  
Keyword(s):  
Attenuation Relation ◽  
Dust Attenuation

Homochirality as the Signature of Extra-Terrestrial Life

1997 ◽  
Vol 161 ◽  
pp. 505-510
Author(s):  
Alexandra J. MacDermott ◽  
Laurence D. Barron ◽  
Andrè Brack ◽  
Thomas Buhse ◽  
John R. Cronin ◽  
...  
Keyword(s):  
Amino Acids ◽  
Protein Synthesis ◽  
Optical Rotation ◽  
Physical Origin ◽  
Natural Choice ◽  
Rosetta Mission ◽  
Terrestrial Life ◽  
Subsurface Layers ◽  
Solar System Bodies ◽  
Origin Of Homochirality

AbstractThe most characteristic hallmark of life is its homochirality: all biomolecules are usually of one hand, e.g. on Earth life uses only L-amino acids for protein synthesis and not their D mirror images. We therefore suggest that a search for extra-terrestrial life can be approached as a Search for Extra- Terrestrial Homochirality (SETH). The natural choice for a SETH instrument is optical rotation, and we describe a novel miniaturized space polarimeter, called the SETH Cigar, which could be used to detect optical rotation as the homochiral signature of life on other planets. Moving parts are avoided by replacing the normal rotating polarizer by multiple fixed polarizers at different angles as in the eye of the bee. We believe that homochirality may be found in the subsurface layers on Mars as a relic of extinct life, and on other solar system bodies as a sign of advanced pre-biotic chemistry. We discuss the chiral GC-MS planned for the Roland lander of the Rosetta mission to a comet and conclude with theories of the physical origin of homochirality.

The physical origin of hydrophobicity

2018 ◽  
Vol 04 ◽  
Author(s):  
Joze Grdadolnik ◽  
Franci Merzel ◽  
Franc Avbelj
Keyword(s):  
Physical Origin

scholarly journals Polaritonic XY-Ising machine

Nanophotonics ◽  
2020 ◽  
Vol 9 (13) ◽  
pp. 4127-4138 ◽  
Author(s):  
Kirill P. Kalinin ◽  
Alberto Amo ◽  
Jacqueline Bloch ◽  
Natalia G. Berloff
Keyword(s):  
Dissipative Systems ◽  
Phase Information ◽  
Physical Origin ◽  
Continuous Spin ◽  
Network Nodes ◽  
Computing Platform ◽  
Ability To Act ◽  
Spin Hamiltonians ◽  
Long Range Interactions ◽  
Accuracy And Stability

AbstractGain-dissipative systems of various physical origin have recently shown the ability to act as analogue minimisers of hard combinatorial optimisation problems. Whether or not these proposals will lead to any advantage in performance over the classical computations depends on the ability to establish controllable couplings for sufficiently dense short- and long-range interactions between the spins. Here, we propose a polaritonic XY-Ising machine based on a network of geometrically isolated polariton condensates capable of minimising discrete and continuous spin Hamiltonians. We elucidate the performance of the proposed computing platform for two types of couplings: relative and absolute. The interactions between the network nodes might be controlled by redirecting the emission between the condensates or by sending the phase information between nodes using resonant excitation. We discuss the conditions under which the proposed machine leads to a pure polariton simulator with pre-programmed couplings or results in a hybrid classical polariton simulator. We argue that the proposed architecture for the remote coupling control offers an improvement over geometrically coupled condensates in both accuracy and stability as well as increases versatility, range, and connectivity of spin Hamiltonians that can be simulated with polariton networks.

scholarly journals How robustly can we constrain the low-mass end of the z ∼ 6−7 stellar mass function? The limits of lensing models and stellar population assumptions in the Hubble Frontier Fields

2020 ◽  
Vol 501 (2) ◽  
pp. 1568-1590
Author(s):  
Lukas J Furtak ◽  
Hakim Atek ◽  
Matthew D Lehnert ◽  
Jacopo Chevallard ◽  
Stéphane Charlot
Keyword(s):  
Star Formation ◽  
Mass Function ◽  
Stellar Mass ◽  
Star Formation History ◽  
Space Telescope ◽  
Formation History ◽  
Low Mass ◽  
Stellar Masses ◽  
Dust Attenuation ◽  
The Impact

ABSTRACT We present new measurements of the very low mass end of the galaxy stellar mass function (GSMF) at z ∼ 6−7 computed from a rest-frame ultraviolet selected sample of dropout galaxies. These galaxies lie behind the six Hubble Frontier Field clusters and are all gravitationally magnified. Using deep Spitzer/IRAC and Hubble Space Telescope imaging, we derive stellar masses by fitting galaxy spectral energy distributions and explore the impact of different model assumptions and parameter degeneracies on the resulting GSMF. Our sample probes stellar masses down to $M_{\star }\gt 10^{6}\, \text{M}_{\odot}$ and we find the z ∼ 6−7 GSMF to be best parametrized by a modified Schechter function that allows for a turnover at very low masses. Using a Monte Carlo Markov chain analysis of the GSMF, including accurate treatment of lensing uncertainties, we obtain a relatively steep low-mass end slope $\alpha \simeq -1.96_{-0.08}^{+0.09}$ and a turnover at $\log (M_T/\text{M}_{\odot})\simeq 7.10_{-0.56}^{+0.17}$ with a curvature of $\beta \simeq 1.00_{-0.73}^{+0.87}$ for our minimum assumption model with constant star formation history (SFH) and low dust attenuation, AV ≤ 0.2. We find that the z ∼ 6−7 GSMF, in particular its very low mass end, is significantly affected by the assumed functional form of the star formation history and the degeneracy between stellar mass and dust attenuation. For example, the low-mass end slope ranges from $\alpha \simeq -1.82_{-0.07}^{+0.08}$ for an exponentially rising SFH to $\alpha \simeq -2.34_{-0.10}^{+0.11}$ when allowing AV of up to 3.25. Future observations at longer wavelengths and higher angular resolution with the James Webb Space Telescope are required to break these degeneracies and to robustly constrain the stellar mass of galaxies on the extreme low-mass end of the GSMF.

scholarly journals Strong and tunable spin–orbit interaction in a single crystalline InSb nanosheet

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Yuanjie Chen ◽  
Shaoyun Huang ◽  
Dong Pan ◽  
Jianhong Xue ◽  
Li Zhang ◽  
...  
Keyword(s):  
Layer Structure ◽  
Orbit Interaction ◽  
Spin Orbit ◽  
Device Layer ◽  
Physical Origin ◽  
Quantum Devices ◽  
Spin Orbit Interaction ◽  
Topological Quantum ◽  
Narrow Bandgap ◽  
Dual Gate

AbstractA dual-gate InSb nanosheet field-effect device is realized and is used to investigate the physical origin and the controllability of the spin–orbit interaction in a narrow bandgap semiconductor InSb nanosheet. We demonstrate that by applying a voltage over the dual gate, efficiently tuning of the spin–orbit interaction in the InSb nanosheet can be achieved. We also find the presence of an intrinsic spin–orbit interaction in the InSb nanosheet at zero dual-gate voltage and identify its physical origin as a build-in asymmetry in the device layer structure. Having a strong and controllable spin–orbit interaction in an InSb nanosheet could simplify the design and realization of spintronic deceives, spin-based quantum devices, and topological quantum devices.

Investigating physical origin of dominant hysteresis phenomenon in perovskite solar cell

2021 ◽  
Author(s):  
Usama Bin Qasim ◽  
Hassan Bin Qasim ◽  
Muhammad Mohsin Saeed ◽  
Muhammad Hussnain Riaz ◽  
Hassan Imran
Keyword(s):  
Solar Cell ◽  
Perovskite Solar Cell ◽  
Hysteresis Phenomenon ◽  
Physical Origin
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