Results 91 to 100 of about 5,560 (224)

Attenuation of LHAASO PeVatrons by the Interstellar Radiation Field and Cosmic Microwave Background Radiation

The Astrophysical Journal
“PeVatrons” refer to astrophysical sources capable of accelerating particles to energies around 10 ^15 electron volts and higher, potentially contributing to the cosmic-ray spectrum in the knee region.
Jianli Zhang, YiQing Guo
doaj   +1 more source

A Neutral Hydrogen Absorption Study of Cold Gas in the Outskirts of the Magellanic Clouds Using the GASKAP-H i Survey

The Astronomical Journal
Cold neutral hydrogen (H i ) is a crucial precursor for molecular gas formation and can be studied via H i absorption. This study investigates H i absorption in low column density regions of the Small and Large Magellanic Clouds (SMC and LMC) using the ...
Hongxing Chen, Snežana Stanimirović, Nickolas M. Pingel, James Dempsey, Frances Buckland-Willis, Susan E. Clark, Helga Dénes, John M. Dickey, Steven Gibson, Katherine Jameson, Ian Kemp, Denis Leahy, Min-Young Lee, Callum Lynn, Yik Ki Ma, N. M. McClure-Griffiths, Claire E. Murray, Hiep Nguyen, Lucero Uscanga, Jacco Th. van Loon, Enrique Vázquez-Semadeni   +20 more
doaj   +1 more source

Interstellar absorption toward HD 14633

The Astrophysical Journal, 1983
Observations are reported of optical interstellar absorption lines of Ti II, Ca II, and Na I in the spectrum of HD 14633, a probable runaway O star ejected from the Perseus spiral arm. Unusually high gas-phase abundances of the normally depleted elements Ca and Ti are found in three high-velocity interstellar line components; the light paths to only a ...
openaire   +1 more source

Sloan Digital Sky Survey IV MaStar: Quantification and Abatement of Interstellar Absorption in the Largest Empirical Stellar Spectral Library

The Astrophysical Journal
We assess the impact of Ca ii λ λ 3934, 3969 and Na i λ λ 5891, 5897 absorption arising in the interstellar medium (ISM) on the Sloan Digital Sky Survey-IV MaNGA Stellar Library (MaStar) and produce corrected spectroscopy for 80% of the 24,162-star ...
Kate H. R. Rubin, Kyle B. Westfall, Claudia Maraston, Daniel Thomas, Renbin Yan, J. Christopher Howk, Erick Aguirre, Kaelee S. Parker, David R. Law   +8 more
doaj   +1 more source

Interstellar grain mantles

, 1986
Interstellar molecular grain mantles are an important component of the interstellar dust inside dense molecular clouds as evidenced by the detection of absorption bands at 2.97, 3.08, 4.61, 6.0 and 6.8 microns.
Witteborn, F. C., Bregman, J., Tielens, Alexander G. G. M., Allamandola, Louis J.   +3 more
core  

Carbon onions: Carriers of the 217.5 nm interstellar absorption feature

, 2003
The UV-VIS characteristics of carbon ions fabricated by an arch discharge in water or liquid nitrogen show characteristics that are similar to the interstellar absorption feature.
Wang, H, Chhowalla, M, Sano, N, Lee, SB, Amaratunga, GAJ, ,, Teo, KBK   +6 more
core  

Analysis of the 3.2–3.3 μm Interstellar Absorption Feature on Three Milky Way Sightlines

The Astrophysical Journal
We report new analyses of spectra of the 3.2–3.3 μ m absorption feature observed in the diffuse interstellar medium toward three Milky Way sources: 2MASS J 17470898 − 2829561 (2M1747) and the Quintuplet Cluster, both located in the Galactic center, and ...
L. S. Bernstein, T. R. Geballe
doaj   +1 more source

The Densities in Diffuse and Translucent Molecular Clouds: Estimates from Observations of C2 and from Three-dimensional Extinction Maps

The Astrophysical Journal
Newly computed collisional rate coefficients for the excitation of C _2 in collisions with H _2 , presented recently by Najar & Kalugina, are significantly larger than the values adopted previously in models for the excitation of the C _2 molecule, a ...
David A. Neufeld, Daniel E. Welty, Alexei V. Ivlev, Paola Caselli, Gordian Edenhofer, Nick Indriolo, Marta Obolentseva, Kedron Silsbee, Paule Sonnentrucker, Mark G. Wolfire   +9 more
doaj   +1 more source

The organic component of interstellar grains

, 1986
The 3.4 micron absorption feature observed in the spectrum of a number of Galactic Center (GC) sources indicates the presence of organic molecules in the interstellar medium.
Greenberg, J. M., Schutte, W. A.
core  

INTERSTELLAR H$_{2}$ NARROW AND DIFFUSE LINE ABSORPTION

, 1974
$^{1}$ J. A. Duardo, ``An Interpretation, of the Diffuse Interstellar Absorption Lines in Terms of Dipole Transitions of $H_{2}$'', Twenty-Sixth Symposium on Molecular Structure and Spectroscopy, The Ohio State University, June 1971.Author Institution ...
Duardo, J. A.
core