Results 71 to 80 of about 2,644 (226)
Optical polarimetry studies of Seyfert galaxies [PDF]
, 1999 Optical imaging polarimetry has been performed on seven nearby Seyfert galaxies, three with face-on and four with edge-on host galaxies of various morphological classifications.
Felton, Michelle Ann
core
Interstellar absorption lines in the spectrum of zeta Ophiuchi
The Astrophysical Journal, 1975 The far-UV spectrum of Zeta Pup is surveyed as obtained from scans by Copernicus satellite detectors. Equivalent widths are tabulated for 147 lines from 35 different ions or isotopes of 19 elements in the direction of Zeta Pup. In addition, 52 unidentified absorption lines are listed whose narrow widths indicate an interstellar origin.
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Abundances of interstellar atoms from ultaviolet absorption lines
The Astrophysical Journal, 1986 The equivalent widths of interstellar absorption lines of Mg II, P II, Cl I and II, Mn II, Fe II, Cu II, and Ni II, obtained in a Copernicus survey of Bohlin et al (1983) have been analyzed to yield column densities along the lines of sight. The measured depletions are clearly correlated with n sub H, the mean hydrogen column density along the line of ...
E. B. Jenkins +2 more
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Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.Abstract Cherenkov detectors have been used in space for decades to measure Galactic Cosmic Rays (GCRs), Solar Energetic Particles (SEPs) and trapped particles. We present proof‐of‐concept GRAS/Geant4 simulations to both show that a cubic fused silica Cherenkov detector with SiPM in LEO has a good sensitivity to SEP and GCR protons as a function of cut‐
C. S. W. Davis +6 more
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Distance to the Galactic Center 7′ Halo from H I Absorption
The Astrophysical JournalUsing archival data, we have made an H I absorption study of the 7 ${}^{{\prime} }$ halo surrounding the Sgr A complex, observed toward the Galactic center (GC) region. We find strong H I absorption near velocities of −53 km s ^−1 , which is due to the 3
Debangan Maji, Subhashis Roy
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The Constraint of Crewed Mars Missions Based on Current Radiation Dose Measurements
Space Weather, Volume 24, Issue 3, March 2026.Abstract Crewed missions to Mars will be a milestone of future space exploration programs. However, the absence of Earth's magnetic field leaves astronauts directly exposed to unattenuated energetic particles in deep space, primarily galactic cosmic rays (GCRs), resulting in significantly higher radiation levels and enhanced health risks. Understanding
Chao Zhang +4 more
wiley +1 more source
Chemistry – An Asian Journal, Volume 21, Issue 4, 25 February 2026.Recent development of cryogenic ion‐trap‐based instrumentation has extended the scope of gas‐phase laser spectroscopy to a wide variety of nonvolatile ions, including carbocations and protonated hydrocarbons, organic dyes, host‐guest complexes, micro‐hydrated ions, hypervalent ions, metal clusters, and ionic intermediates formed in solution.
Satoru Muramatsu +2 more
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The Distance to the S147 Supernova Remnant
The Astrophysical JournalIn the absence of a parallax distance to a pulsar or a surviving binary in a supernova remnant (SNR), distances to Galactic SNRs are generally very uncertain.
C. S. Kochanek +2 more
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Circular polarization of interstellar absorption lines at radio frequencies
The Astrophysical Journal, 1985 On etudie la formation d'un rayonnement de raies lineairement et circulairement polarise aux frequences radio lorsque le rayonnement d'une source continue eloignee se propage dans un gaz diffus comme le milieu interstellaire. On a obtenu les equations du transfert radiatif pour les parametres de Stokes (I, Q, U et V)
S. Deguchi, W. D. Watson
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Beyond Sight: Neuromorphic Synapses Triggered by Invisible Light
Small, Volume 22, Issue 10, 17 February 2026.This review collects advancements in neuromorphic and optoelectronic devices, offering a structured analysis based on stimulus energy levels and architectural designs within the invisible spectrum. By categorizing recent research according to utilized wavelengths, specifically X‐ray, UV, and IR ranges, the study highlights diverse synaptic properties ...
Jisoo Park +4 more
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