Results 71 to 80 of about 944,715 (218)

Regarding the Detection of Interstellar C4 and C5 Molecules

The Astrophysical Journal
Analysis of very high signal-to-noise ratio (S/N) spectra of reddened stars allowed us to determine an upper limit (UL) of the column density N (C _4 ).
G. A. Galazutdinov, E. I. Kazanina, J. Krełowski   +2 more
doaj   +1 more source

Raman analysis of organic refractory materials after energetic processing: Evidence for amorphous carbon on TNOs and comets

Meteoritics &Planetary Science, Volume 61, Issue 8, Page 1994-2015, August 2026.
Abstract Amorphous carbon (αC) is found in various extraterrestrial particles, including those thought to originate from the outer Solar System. αC can form through two main processes involving C‐rich materials: exposure to energetic charged particles and thermal processing.
M. Germanà, A. Vyjidak, G. A. Baratta, B. M. Giuliano, R. G. Urso, C. Scirè, D. Fulvio, T. Grassi, P. Jusko, P. Caselli, M. E. Palumbo   +10 more
wiley   +1 more source

Electrons in the cosmic radiation [PDF]

, 1990
The nature of cosmic ray electrons and their radiation in the Universe has been studied. A convection associated diffusion model is proposed to describe the main characteristics of the large-scale distribution of cosmic ray electrons in the Galaxy: (1) a
Chi, Xinyu, Chi, X
core  

Observations of variability in interstellar absorption lines [PDF]

, 2018
Nedavna otkrića varijabilnosti inteziteta međuzvjezdanih spektralnih linija ukazuju na moguće postojanje brzih i vrlo malih struktura materije u međuzvjezdanom mediju, reda veličine od 10 do 100 astronomskih jedinica (AU).
Vješnica, Stella
core   +3 more sources

Tiny-scale Properties within the Interstellar Medium toward PSR J1644−4559. I. Observational Evidence of Turbulence-induced Tiny-scale Atomic Structures

The Astrophysical Journal Supplement Series
We investigated H i absorption toward a single pulsar, PSR J1644−4559, and its variability over timescales from days to years, using Murriyang, CSIRO’s Parkes Radio Telescope.
Mengting Liu, Di Li, J. R. Dawson, Joel M. Weisberg, Snežana Stanimirović, George Hobbs, Simon Johnston, Lawrence Toomey, Siyao Xu, Chao-Wei Tsai, Donghui Quan, Stacy Mader, James A. Green, Lei Zhang, Ningyu Tang, Pei Wang, Kai Zhang, Pei Zuo, Gan Luo, Yi Feng, Shi Dai, Aditi Kaushik, Mengyao Xue, Chenchen Miao   +23 more
doaj   +1 more source

Combining magnetic and electric sails for interstellar deceleration

, 2016
International audienceThe main benefit of an interstellar mission is to carry out in-situ measurements within a target star system. To allow for extended in-situ measurements, the spacecraft needs to be decelerated.
Hein, Andreas Makoto, Perakis, Nikolaos
core   +1 more source

An Ultraviolet Study of CO Chemistry in the Magellanic Clouds

The Astronomical Journal
How does molecular cloud chemistry change with metallicity? In this work, we study the relation between molecular hydrogen (H _2 ) and carbon monoxide (CO) at 1/2 and 1/5 solar metallicity using ultraviolet absorption spectroscopy obtained as part of the
Kirill Tchernyshyov, Jessica K. Werk, Julia Roman-Duval   +2 more
doaj   +1 more source

The Local Group L-band Survey: Probing Cold Atomic Gas in IC 10 with Neutral Hydrogen Absorption

The Astrophysical Journal
We present the first localized detections of the cold neutral medium (CNM) in IC 10, offering a rare view of dense atomic gas in a low-metallicity ( Z / Z _⊙  ∼ 0.27) dwarf galaxy.
Ioana A. Stelea, Snežana Stanimirović, Nickolas M. Pingel, Hongxing Chen, Eric W. Koch, Adam K. Leroy, Erik Rosolowsky, Chang-Goo Kim, Alberto D. Bolatto, Julianne J. Dalcanton, Michael P. Busch, Harrisen Corbould, J. R. Dawson, Cosima Eibensteiner, Amanda Kepley, Melanie Krips, Claire E. Murray, Julia Roman-Duval, Daniel R. Rybarczyk, Evan D. Skillman, Elizabeth Tarantino, Vicente Villanueva, Thomas G. Williams   +22 more
doaj   +1 more source

Photometric Mapping of Carbonaceous/Siliceous Dust and Water Ice in the ISM with JWST: Applications to the Dense Sightlines

The Astronomical Journal
We introduce a new photometric mapping method for the James Webb Space Telescope (JWST) to measure the spatial distribution of carbonaceous dust, siliceous dust, and water ice by using absorption features arising from the grains in the dense interstellar
Burcu Günay, Karl D. Gordon, Joshua E. G. Peek, Marjorie Decleir, Dries Van De Putte, Kirill Tchernyshyov, Michael G. Burton   +6 more
doaj   +1 more source

High-Resolution UV Absorption Observations of the Local Interstellar Cavity

, 2010
International audienceWe present far-ultraviolet (1245-1680 Å), high-resolution ( R ~ 3 km s-1 ) spectroscopic observations of three early-type stars (HD 32630, HD 158427, and HD 175191) located within 75 pc of the Sun recorded with the recently ...
Rosine Lallement, Lallement, Rosine, Barry Y. Welsh, Welsh, Barry Y.   +3 more
core   +1 more source