Results 71 to 80 of about 21,871 (195)

Correlations between Dust Extinction Features across All Wavelength Scales: From Diffuse Interstellar Bands to R(V)

The Astrophysical Journal
Understanding variations in the dust extinction curve is imperative for using dust as a tracer of local structure in the interstellar medium, understanding dust chemistry, and performing extinction corrections.
Andrew K. Saydjari, Gregory M. Green
doaj   +1 more source

The optical spectrum of a large isolated polycyclic aromatic hydrocarbon: hexa-peri-hexabenzocoronene, C42H18

, 2008
The first optical spectrum of an isolated polycyclic aromatic hydrocarbon large enough to survive the photophysical conditions of the interstellar medium is reported.
Damian L. Kokkin, Goto, Gregory F. Metha, Jenniskens, Klaas Nauta, Le Page, Léger, Léger, Masakazu Nakajima, Nigel T. Lucas, Pino, Salama, Sloan, Thomas D. Varberg, Timothy W. Schmidt, Troy, Tyler P. Troy   +16 more
core   +1 more source

The use of Planetary Nebulae precursors in the study of Diffuse Interstellar Bands [PDF]

, 2005
We present the first results of a systematic search for Diffuse Interstellar Bands in a carefully selected sample of post-AGB stars observed with high resolution optical spectroscopy.
Garcia-Lario, P., Luna, R., Satorre, M. A.   +2 more
core   +3 more sources

Doppler splitting in diffuse interstellar bands [PDF]

Monthly Notices of the Royal Astronomical Society, 2010
We demonstrate evident Doppler splitting in the profiles of many narrow diffuse interstellar bands (DIBs). Their components are compared with those of atomic and molecular lines of interstellar origin. It is shown that it is likely that the species that shares both wavelength shifts and strength ratios of the Doppler components seen in the DIB profiles
T. Weselak, G. A. Galazutdinov, Inwoo Han, J. Krełowski   +3 more
openaire   +1 more source

Confined Chemistry in Space: Zeolite‐Supported Fe13 Nanoclusters Modulate CS Reactivity

Small Structures, Volume 7, Issue 3, March 2026.
The study explores how an Fe13 cluster confined in chabazite reshapes the reaction of CS and H2 under astrochemical conditions. Confinement promotes C–S bond cleavage over hydrogenation, directing chemistry toward CH4 and H2S formation. Additional CS enables CS2 and C2 species. Microkinetic analysis identifies protoplanetary environments where zeolites
Gerard Pareras, Albert Rimola
wiley   +1 more source

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, Weihao Liu, Jingnan Guo, Mikhail Dobynde, Robert F. Wimmer‐Schweingruber   +4 more
wiley   +1 more source

Unidentified Infrared Emission Bands in the Diffuse Interstellar Medium

, 2000
Using the Mid-Infrared Spectrometer on board the Infrared Telescope in Space and the low-resolution grating spectrometer (PHT-S) on board the Infrared Space Observatory, we obtained 820 mid-infrared (5 to 12 $\mu$m) spectra of the diffuse interstellar ...
Boulanger F., Cesarsky D., Clegg P. E., Dartois E., Duley W. W., d’Hendecourt L. B., Feinstein A., H. Okuda, H. Shibai, Habing H. J., I. Yamamura, Jourdain de Muizon M., K. Okumura, Kessler M., Kin‐Wing Chan, Leger A., Lemke D., M. Mizutani, Mattila K., Mattila K., Murakami H., Okumura K., Omont A., Onaka T., Papoular R., Puget J. L., Roelfsema P. R., T. L. Roellig, T. Nakagawa, T. Onaka, T. Tanabe, Trams N., Verstraete L.   +32 more
core   +2 more sources

Reduced Geomagnetic Shielding During the Laschamps Excursion and Its Impact on Cosmic‐Ray‐Induced Atmospheric Radiation

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract The Laschamps geomagnetic excursion (≈41,000 years BP) was a period of significant weakening and incomplete reversal of the Earth's magnetic field. The weakening substantially reduced geomagnetic shielding against cosmic rays (CRs), which contribute to phenomena at Earth, such as cosmogenic isotope production, and atmospheric ionisation and ...
N. Larsen, I. Usoskin, A. Mishev, S. Koldobskiy, P. Väisänen   +4 more
wiley   +1 more source

Multi-Wavelength Observations and Modeling of Loop I

Galaxies, 2018
The article aims to overview the origin and current dynamical state of a giant structure on the northern galactic sky—the radio Loop I extending from ≈ − 45 ∘ to ≈ + 45 ∘ in longitudes and up to ≈ 80 ...
Yuri Shchekinov
doaj   +1 more source

Near-IR Photoluminescence of C60+ and Implications for Astronomy

, 2017
We have observed that C$_{60}^+$ ions isolated in cryogenic matrixes show pronounced near-IR photoluminescence upon excitation in the near-IR range. By contrast UV photoexcitation does not lead to measurable luminescence.
Kappes, Manfred M., Kern, Bastian, Strelnikov, Dmitry   +2 more
core   +1 more source