Results 31 to 40 of about 20,710 (214)

Interstellar Extinction and Elemental Abundances: Individual Sight Lines [PDF]

Astrophysical Journal Supplement Series, 2021
While it is well recognized that both the Galactic interstellar extinction curves and the gas-phase abundances of dust-forming elements exhibit considerable variations from one sight line to another, as yet most of the dust extinction modeling efforts ...
Wenbo Zuo, Aigen Li, Gang Zhao
semanticscholar   +1 more source

A persistent influence of supernovae on biodiversity over the Phanerozoic

Ecology and Evolution, Volume 13, Issue 3, March 2023., 2023
It shows the correlation between diversity and supernovae frequency. Abstract It is an open question what has constrained macroevolutionary changes in marine animal diversity on the time scale of the Phanerozoic. Here, we will show that supernovae appear to have significantly influenced the biodiversity of life.
Henrik Svensmark
wiley   +1 more source

Decadal and Annual Variations in Meteoric Flux From Ulysses, Wind, and SOFIE Observations

Journal of Geophysical Research: Space Physics, Volume 127, Issue 10, October 2022., 2022
Abstract Our solar system is filled with meteoric particles, or cosmic dust, which is either interplanetary or interstellar in origin. Interstellar dust (ISD) enters the heliosphere due to the relative motion of the sun and the interstellar flow. Interplanetary dust (IPD) comes primarily from asteroid collisions or comet sublimation, and comprises the ...
Mark E. Hervig, David Malaspina, Veerle Sterken, Lynn B. Wilson III, Silvan Hunziker, Scott M. Bailey   +5 more
wiley   +1 more source

Dust Extinction Law in Nearby Star-resolved Galaxies. II. M33 Traced by Supergiants

, 2022
The dust extinction curves toward individual sight lines in M33 are derived for the first time with a sample of reddened O-type and B-type supergiants obtained from the Local Group Galaxies Survey (LGGS).
Yuxi 钰溪 Wang 王, J. Gao 高, Y. Ren 任, B. Chen 陈   +3 more
semanticscholar   +1 more source

Recent Advances in the Domain of Cyclic (Alkyl)(Amino) Carbenes

Chemistry – An Asian Journal, Volume 17, Issue 7, April 1, 2022., 2022
The present review highlights recent developments in the domain of cyclic (alkyl) (amino) carbenes with the emphasis on their applications in the field of catalysis, activation of small molecules, radical chemistry, organic light‐emitting diodes (OLEDs), medicinal chemistry, and single‐molecule magnets (SMMs). Abstract Isolation of cyclic (alkyl) amino
Saroj Kumar Kushvaha, Ankush Mishra, Herbert W. Roesky, Kartik Chandra Mondal   +3 more
wiley   +1 more source

Extinction of Taurus, Orion, Perseus, and California Molecular Clouds Based on the LAMOST, 2MASS, and Gaia Surveys. I. 3D Extinction and Structure

The Astrophysical Journal, 2023
The 3D extinction and structure are studied for the Taurus, Orion, Perseus, and California molecular clouds based on the LAMOST spectroscopy. Stellar color excess is calculated with the intrinsic color index derived from the atmospheric parameters in the
ZheTai Cao, Biwei Jiang, He Zhao, Mingxu Sun   +3 more
doaj   +1 more source

Supernova Rates and Burial of Organic Matter

Geophysical Research Letters, Volume 49, Issue 1, 16 January 2022., 2022
Abstract Life on Earth appears to have evolved under the influence of supernovae activity in the solar neighborhood. Supernovae frequency regulates the flux of cosmic ray particles arriving at the top of the Earth's atmosphere, where empirical evidence supports a close connection between cosmic rays, clouds, and climate.
Henrik Svensmark
wiley   +1 more source

THEMIS 2.0: A self-consistent model for dust extinction, emission, and polarisation [PDF]

Astronomy & Astrophysics
Recent observational constraints in emission, extinction, and polarisation have at least partially invalidated most of the astronomical standard grain models for the diffuse interstellar medium.
N. Ysard, A. Jones, V. Guillet, K. Demyk, M. Decleir, L. Verstraete, Ilyes Choubani, M. Miville-Deschênes, L. Fanciullo   +8 more
semanticscholar   +1 more source

Magnesium and silicon in interstellar dust: X-ray overview [PDF]

Astronomy & Astrophysics, 2020
Context.The dense Galactic environment is a large reservoir of interstellar dust. Therefore, this region represents a perfect laboratory to study the properties of cosmic dust grains. X-rays are the most direct way to detect the interaction of light with
D. Rogantini, E. Costantini, S. Zeegers, M. Mehdipour, I. Psaradaki, A. Raassen, C. Vries, L. Waters   +7 more
semanticscholar   +1 more source

Relations between Mid-infrared Dust Emission and UV Extinction [PDF]

Astrophysical Journal, 2021
We analyze low-resolution Spitzer infrared (IR) 5−14 μm spectra of the diffuse emission toward a carefully selected sample of stars. The sample is composed of sight lines toward stars that have well-determined ultraviolet (UV) extinction curves and that ...
D. Massa, K. Gordon, E. Fitzpatrick
semanticscholar   +1 more source