Results 31 to 40 of about 4,701,578 (85)

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  

Towards a Measurement of the Primordial Helium Isotope Ratio

The Astrophysical Journal
We report the discovery of two metastable neutral helium (He I *) absorbers in the Milky Way, and use the upgraded CRyogenic InfraRed Echelle Spectrograph (or CRIRES) on the Very Large Telescope to determine the helium isotope ratio, ^3 He/ ^4 He, along ...
Ryan J. Cooke, James W. Johnson, Pasquier Noterdaeme, Max Pettini, Louise Welsh, Aldric Wong, Céline Péroux   +6 more
doaj   +1 more source

Shocks, Compressible Perturbations, and Intermittency in the Very Local Interstellar Medium: Voyager 1 and 2 Observations and Numerical Modeling

The Astrophysical Journal
The Voyager spacecraft (V1 and V2) provide unique in situ measurements of perturbations propagating beyond the heliopause through the very local interstellar medium (VLISM), including the shocks and pressure fronts whose origin is debated. In particular,
Federico Fraternale, Nikolai V. Pogorelov, Ratan Bera, Leonard F. Burlaga, Maciej Bzowski   +4 more
doaj   +1 more source

Organometallic Chemistry in the interstellar medium

, 2002
We present in this paper a review of an astrochemistry study concerning interactions between metals and molecules. The possibility of such an organometallic chemistry is based on the metal depletion in the interstellar medium (ISM) and the large ...
A. Klotz, B. Chaudret
core   +1 more source

An Empirical Extinction Curve Revealed by Gaia XP Spectra and LAMOST

The Astrophysical Journal
We present a direct measurement of extinction curves using corrected Gaia XP spectra of the common sources in Gaia DR3 and LAMOST DR7. Our analysis of approximately 370,000 high-quality samples yielded a high-precision average extinction curve for the ...
Ruoyi Zhang, Haibo Yuan, Bowen Huang, Tao Wang, Lin Yang, Gregory M. Green, Xiangyu Zhang   +6 more
doaj   +1 more source

The Interstellar Medium

, 2005
Describing interstellar matter in our galaxy in all of its various forms, this book also considers the physical and chemical processes that are occurring within this matter.
Lequeux, James
core   +1 more source

FEAST: Probing Hierarchical Star Formation with the Spatial Distributions of Young Star Clusters

The Astrophysical Journal
We apply the angular two-point correlation function (TPCF) to the spatial distributions of young star clusters (YSCs) in four nearby star forming galaxies (NGC 628, NGC 4449, M51, and M83) in order to investigate their underlying hierarchical structuring.
Drew Lapeer, Daniela Calzetti, Kathryn Grasha, Angela Adamo, Bruce G. Elmegreen, Arjan Bik, Giacomo Bortolini, Anne Buckner, Michele Cignoni, Matteo Correnti, Debra Meloy Elmegreen, H. Faustino Vieira, Max Hamilton, Kelsey Johnson, Thomas S.-Y. Lai, Sean T. Linden, Subhransu Maji, Matteo Messa, Göran Östlin, Alex Pedrini, E. Sabbi, Linda J. Smith   +21 more
doaj   +1 more source

Novel algorithms for the understanding of the chemical cosmos [PDF]

, 2015
Molecular data from the interstellar medium (ISM) contain information that holds the key to understanding our chemically controlled cosmos and to unlocking the secrets of our universe.
Makrymallis, A
core  

Interpretation of the IBEX-Lo Observations of Energetic Neutral Atoms along the Voyager Trajectories

The Astrophysical Journal Letters
This Letter addresses a long-standing discrepancy between simulated energetic neutral atom (ENA) fluxes and Interstellar Boundary Explorer (IBEX) observations in the ∼0.02–0.1 keV energy range.
Federico Fraternale, Ratan Bera, Nikolai V. Pogorelov, Eric J. Zirnstein, Vadim Roytershteyn   +4 more
doaj   +1 more source

A photon transport problem with a time-dependent point source [PDF]

, 2009
We consider a time-dependent problem of photon transport in an interstellar cloud with a point photon source modeled by a Dirac δ functional. The existence of a unique distributional solution to this problem is established by using the theory of ...
McBride, A.C., Lamb, W., Belleni-Morante, A.   +2 more
core   +3 more sources