scholarly journals Fermi LAT study of cosmic-rays and the interstellar medium in nearby molecular clouds

2013 ◽  
Author(s):  
Katsuhiro Hayashi ◽  
Tsunefumi Mizuno ◽  
Fermi-LAT Collaboration
Keyword(s):  
Cosmic Rays ◽  
Interstellar Medium ◽  
Molecular Clouds

scholarly journals QUANTIFYING THE INTERSTELLAR MEDIUM AND COSMIC RAYS IN THE MBM 53, 54, AND 55 MOLECULAR CLOUDS AND THE PEGASUS LOOP USINGFERMI-LAT GAMMA-RAY OBSERVATIONS

2016 ◽  
Vol 833 (2) ◽  
pp. 278 ◽  
Author(s):  
T. Mizuno ◽  
S. Abdollahi ◽  
Y. Fukui ◽  
K. Hayashi ◽  
A. Okumura ◽  
...  
Keyword(s):  
Cosmic Rays ◽  
Interstellar Medium ◽  
Molecular Clouds ◽  
Gamma Ray

scholarly journals The cycling of carbon into and out of dust

2014 ◽  
Vol 168 ◽  
pp. 313-326 ◽  
Author(s):  
Anthony P. Jones ◽  
Nathalie Ysard ◽  
Melanie Köhler ◽  
Lapo Fanciullo ◽  
Marco Bocchio ◽  
...  
Keyword(s):  
Optical Properties ◽  
Cosmic Rays ◽  
Shock Waves ◽  
Interstellar Medium ◽  
Gas Phase ◽  
Molecular Clouds ◽  
Observational Evidence ◽  
Electron Collisions ◽  
Uv Photons ◽  
Dust Evolution

Observational evidence seems to indicate that the depletion of interstellar carbon into dust shows rather wide variations and that carbon undergoes rather rapid recycling in the interstellar medium (ISM). Small hydrocarbon grains are processed in photo-dissociation regions by UV photons, by ion and electron collisions in interstellar shock waves and by cosmic rays. A significant fraction of hydrocarbon dust must therefore be re-formed by accretion in the dense, molecular ISM. A new dust model (Jones et al., Astron. Astrophys., 2013, 558, A62) shows that variations in the dust observables in the diffuse interstellar medium (nH ≤ 103 cm−3), can be explained by systematic and environmentally-driven changes in the small hydrocarbon grain population. Here we explore the consequences of gas-phase carbon accretion onto the surfaces of grains in the transition regions between the diffuse ISM and molecular clouds (e.g., Jones, Astron. Astrophys., 2013, 555, A39). We find that significant carbonaceous dust re-processing and/or mantle accretion can occur in the outer regions of molecular clouds and that this dust will have significantly different optical properties from the dust in the adjacent diffuse ISM. We conclude that the (re-)processing and cycling of carbon into and out of dust is perhaps the key to advancing our understanding of dust evolution in the ISM.

scholarly journals Turbulence in the interstellar medium

2014 ◽  
Vol 21 (3) ◽  
pp. 587-604 ◽  
Author(s):  
D. Falceta-Gonçalves ◽  
G. Kowal ◽  
E. Falgarone ◽  
A. C.-L. Chian
Keyword(s):  
Cosmic Rays ◽  
Magnetic Fields ◽  
Interstellar Medium ◽  
Turbulent Flows ◽  
Molecular Clouds ◽  
Three Dimensional ◽  
Interstellar Turbulence ◽  
The Stability ◽  
Observational Techniques ◽  
And Diffusion

Abstract. Turbulence is ubiquitous in the insterstellar medium and plays a major role in several processes such as the formation of dense structures and stars, the stability of molecular clouds, the amplification of magnetic fields, and the re-acceleration and diffusion of cosmic rays. Despite its importance, interstellar turbulence, like turbulence in general, is far from being fully understood. In this review we present the basics of turbulence physics, focusing on the statistics of its structure and energy cascade. We explore the physics of compressible and incompressible turbulent flows, as well as magnetised cases. The most relevant observational techniques that provide quantitative insights into interstellar turbulence are also presented. We also discuss the main difficulties in developing a three-dimensional view of interstellar turbulence from these observations. Finally, we briefly present what the main sources of turbulence in the interstellar medium could be.

scholarly journals Interaction of escaping cosmic rays with molecular clouds

2013 ◽  
Vol 9 (S296) ◽  
pp. 320-327
Author(s):  
Stefano Gabici
Keyword(s):  
Cosmic Rays ◽  
Interstellar Medium ◽  
Present Status ◽  
Molecular Clouds ◽  
Gamma Ray ◽  
The Way

AbstractThe study of the gamma–ray radiation produced by cosmic rays that escape their accelerators is of paramount importance for (at least) two reasons: first, the detection of those gamma–ray photons can serve to identify the sources of cosmic rays and, second, the characteristics of that radiation give us constraints on the way in which cosmic rays propagate in the interstellar medium. This paper reviews the present status of the field.

scholarly journals FERMILARGE AREA TELESCOPE STUDY OF COSMIC RAYS AND THE INTERSTELLAR MEDIUM IN NEARBY MOLECULAR CLOUDS

2012 ◽  
Vol 755 (1) ◽  
pp. 22 ◽  
Author(s):  
M. Ackermann ◽  
M. Ajello ◽  
A. Allafort ◽  
L. Baldini ◽  
J. Ballet ◽  
...  
Keyword(s):  
Cosmic Rays ◽  
Interstellar Medium ◽  
Molecular Clouds

scholarly journals ERRATUM: “FERMI LARGE AREA TELESCOPE STUDY OF COSMIC-RAYS AND THE INTERSTELLAR MEDIUM IN NEARBY MOLECULAR CLOUDS” (2012, ApJ, 755, 22)

2013 ◽  
Vol 778 (1) ◽  
pp. 82 ◽  
Author(s):  
M. Ackermann ◽  
M. Ajello ◽  
A. Allafort ◽  
L. Baldini ◽  
J. Ballet ◽  
...  
Keyword(s):  
Cosmic Rays ◽  
Interstellar Medium ◽  
Molecular Clouds ◽  
Large Area

scholarly journals Grain-surface reactions in molecular clouds: the effect of cosmic rays and quantum tunnelling

2014 ◽  
Vol 440 (4) ◽  
pp. 3557-3567 ◽  
Author(s):  
L. Reboussin ◽  
V. Wakelam ◽  
S. Guilloteau ◽  
F. Hersant
Keyword(s):  
Cosmic Rays ◽  
Molecular Clouds ◽  
Surface Reactions ◽  
Quantum Tunnelling ◽  
Grain Surface

Discussion session on star formation, molecular clouds and the interstellar medium

1994 ◽  
Vol 217 (1-2) ◽  
pp. 227-230
Author(s):  
Karen M. Strom ◽  
Lennart Nordh ◽  
Eli Dwek
Keyword(s):  
Star Formation ◽  
Interstellar Medium ◽  
Molecular Clouds ◽  
Discussion Session

scholarly journals HIGH-LATITUDE, TRANSLUSCENT MOLECULAR CLOUDS AS PROBES OF LOCAL COSMIC RAYS

2015 ◽  
Vol 805 (1) ◽  
pp. 50 ◽  
Author(s):  
Ryan D. Abrahams ◽  
Timothy A. D. Paglione
Keyword(s):  
Cosmic Rays ◽  
High Latitude ◽  
Molecular Clouds
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