Results 21 to 30 of about 5,123 (230)

New Water Oxidation Mechanism in Photosystem II Resolves Major Experimental Controversies

open access: yesAngewandte Chemie, EarlyView.
In Photosystem II Oxygen Evolving Complex, we discovered the O3‐O6 peroxide at lower energy. Assignment of the O3 ligated by histidine (His337) as a slow exchanging substrate and its coupling with O6 give the O─O bond formation mechanism most consistent with all currently available experimental data. Proposal shows how protein environment can steer the
Yulia Pushkar
wiley   +2 more sources

A Rotating Accretion Disk around MWC 297, a Young B1.5Ve Star

open access: yesThe Astronomical Journal, 2023
High-resolution spectra with iSHELL on IRTF in the K and M bands of the young, heavily accreting B1.5Ve star MWC 297 show numerous double-peaked CO lines. These CO lines originate in an inclined gaseous disk in Keplerian rotation.
Göran Sandell, William Vacca
doaj   +1 more source

Review: Far-infrared instrumentation and technological development for the next decade [PDF]

open access: yes, 2019
Far-infrared astronomy has advanced rapidly since its inception in the late 1950s, driven by a maturing technology base and an expanding community of researchers.
Staguhn, Johannes   +81 more
core   +3 more sources

Millimeter/submillimeter fourier transform spectroscopy of Jovian planet atmospheres [PDF]

open access: yes, 1996
A new Fourier transform spectrometer, built for use at the Caltech Submillimeter Observatory, has been used to observe all four of the jovian planets (Jupiter, Saturn, Uranus, and Neptune) in the millimeter-submillimeter wavelength range (0.3- 3.0 mm).
Weisstein, Eric W.
core   +1 more source

Cross-slot metal-mesh bandpass filters for far-infrared astronomy

open access: yesMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI, 2022
The far-infrared (IR) region is rich with information needed to characterize interstellar dust and to investigate the cold outer planets of the solar system and their icy moons. The proposed sub-orbital observatory the Balloon Experiment for Galactic INfrared Science (BEGINS) will utilize cryogenic instruments to map spectral energy distributions (SEDs)
Perido, Joanna   +9 more
openaire   +2 more sources

On the Origin of Radio-loudness in Active Galactic Nuclei Using Far-infrared Polarimetric Observations

open access: yesThe Astrophysical Journal, 2023
The dichotomy between radio-loud (RL) and radio-quiet (RQ) active galactic nuclei (AGNs) is thought to be intrinsically related to radio jet production. This difference may be explained by the presence of a strong magnetic field ( B -field) that enhances,
Enrique Lopez-Rodriguez   +5 more
doaj   +1 more source

How Accurately Can Obscured Galaxy Luminosities Be Measured Using Spectral Energy Distribution Fitting of Near- through Far-infrared Observations?

open access: yesThe Astrophysical Journal
Infrared-luminous galaxies are important sites of stellar and black hole mass assembly at most redshifts. Their luminosities are often estimated by fitting spectral energy distribution (SED) models to near- to far-infrared data, but the dependence of ...
Duncan Farrah   +25 more
doaj   +1 more source

The Structure of Magnetic Fields in Spiral Galaxies: A Radio and Far-infrared Polarimetric Analysis

open access: yesThe Astrophysical Journal, 2023
We propose and apply a method to quantify the morphology of the large-scale ordered magnetic fields ( B -fields) in galaxies. This method is adapted from the analysis of Event Horizon Telescope polarization data.
William Jeffrey Surgent   +2 more
doaj   +1 more source

Tailoring Phonon‐Driven Responses in α‐MoO3 through Isotopic Enrichment

open access: yesAdvanced Materials, EarlyView.
ABSTRACT The implementation of polaritonic materials into nanoscale devices requires selective tuning of parameters to realize desired spectral or thermal responses. One robust material, α‐MoO3, an orthorhombic crystal boasting three distinct phonon dispersions, provides three polaritonic dispersions of hyperbolic phonon polaritons (HPhPs) across the ...
Thiago S. Arnaud   +31 more
wiley   +1 more source

HerMES : SPIRE galaxy number counts at 250, 350, and 500 μm [PDF]

open access: yes, 2010
Emission at far-infrared wavelengths makes up a significant fraction of the total light detected from galaxies over the age of Universe. Herschel provides an opportunity for studying galaxies at the peak wavelength of their emission.
M Vaccari   +441 more
core   +1 more source

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