Results 1 to 10 of about 345 (143)

Modeling Cosmic-ray Electron Spectra and Synchrotron Emission in the Multiphase Interstellar Medium

The Astrophysical Journal
We model the transport and spectral evolution of 1–100 GeV cosmic-ray electrons (CREs) in TIGRESS magnetohydrodynamic simulations of the magnetized, multiphase interstellar medium.
Nora B. Linzer, Lucia Armillotta, Eve C. Ostriker, Eliot Quataert   +3 more
doaj   +3 more sources

Spectral Index of Synchrotron Emission: Insights From the Diffuse and Magnetised Interstellar Medium [PDF]

Astronomy and Astrophysics, 2021
Context.The interpretation of Galactic synchrotron observations is complicated by the degeneracy between the strength of the magnetic field perpendicular to the line of sight (LOS),B⊥, and the cosmic-ray electron (CRe) spectrum. Depending on the observing frequency, an energy-independent spectral energy slopesfor the CRe spectrum is usually assumed:s= −
Elena Bellomi, Daniele Galli, Vibor Jelić   +2 more
exaly   +8 more sources

Advanced Diagnostics for the Study of Linearly Polarized Emission. II. Application to Diffuse Interstellar Radio Synchrotron Emission [PDF]

Astrophysical Journal, 2018
Abstract Diagnostics of polarized emission provide us with valuable information on the Galactic magnetic field and the state of turbulence in the interstellar medium, which cannot be obtained from synchrotron intensity alone. In Paper I, we derived polarization diagnostics that are rotationally and translationally invariant in the Q–U ...
Blakesley Burkhart, Gianni Bernardi, Bryan Gaensler   +2 more
exaly   +7 more sources

The Influence of the Ionized Medium on Synchrotron Emission in Interstellar Space [PDF]

Astrophysical Journal, 1972
The effect of the ionized gas on synchrotron emission in the interstellar medium is investigated. A detailed calculation of the synchrotron emissivity of cosmic electrons, assumed to have an isotropic pitch-angle distribution in a uniform magnetic field, is made as a function of frequency and observation angle with respect to the field. The results are
Reuven Ramaty
exaly   +2 more sources

Implications on Spatial Models of Interstellar Gamma-Ray Inverse-Compton Emission From Synchrotron Emission Studies in Radio and Microwaves [PDF]

Physical Review D, 2019
Cosmic rays interacting with gas and photon fields in the Galaxy produce interstellar gamma-ray emission (IGE), which accounts for almost 50% of the photons detected at gamma-ray energies. Models of this IGE have to be very accurate for interpreting the high-quality observations by present gamma-ray telescopes, such as Fermi Large Area Telescope (LAT).
Elena Orlando
exaly   +4 more sources

Foreground Emission Randomization Due to Dynamics of Magnetized Interstellar Medium: WMAP and Planck Frequency Bands

Foundations
Using the results of numerical simulations and astrophysical observations (mainly in the WMAP and Planck frequency bands), it is shown that Galactic foreground emission becomes more sensitive to the mean magnetic field with the frequency, resulting in ...
Alexander Bershadskii
doaj   +3 more sources

Studying Galactic Interstellar Turbulence Through Fluctuations in Synchrotron Emission - First LOFAR Galactic Foreground Detection

Astronomy and Astrophysics, 2013
Aims: The characteristic outer scale of turbulence (i.e. the scale at which the dominant source of turbulence injects energy to the interstellar medium) and the ratio of the random to ordered components of the magnetic field are key parameters to characterise magnetic turbulence in the interstellar gas, which affects the propagation of cosmic rays ...
Sarod Yatawatta, George Heald, Heino Falcke   +2 more
exaly   +2 more sources

Dust Emission in Galaxies at Millimeter Wavelengths: Cooling of star forming regions in NGC6946 [PDF]

EPJ Web of Conferences, 2022
Interstellar dust plays an important role in the formation of molecular gas and the heating and cooling of the interstellar medium. The spatial distribution of the mm-wavelength dust emission from galaxies is largely unexplored. The NIKA2 Guaranteed Time
Ejlali G., Adam R., Ade P., Ajeddig H., André P., Artis E., Aussel H., Beelen A., Benoît A., Berta S., Bing L., Bourrion O., Calvo M., Catalano A., de Looze I., De Petris M., Désert F.-X., Doyle S., Driessen E.F. C., Galametz M., Galliano F., Gomez A., Goupy J., Jones A.P., Hughes A., Katsioli S., Kéruzoré F., Kramer C., Ladjelate B., Lagache G., Leclercq S., Lestrade J.-F., Macías-Pérez J.-F., Madden S.C., Maury A., Mauskopf P., Mayet F., Monfardini A., Muñoz-Echeverría M., Nersesian A., Perotto L., Pisano G., Ponthieu N., Revéret V., Rigby A.J., Ritacco A., Romero C., Roussel H., Ruppin F., Schuster K., Shu S., Sievers A., Smith M. W. S. L., Tabatabaei F. S., Tucker C., Xilouris E.M., Zylka R.   +56 more
doaj   +1 more source

Studying Galactic interstellar turbulence through fluctuations in synchrotron emission [PDF]

Astronomy and Astrophysics, 2013
The characteristic outer scale of turbulence and the ratio of the random to ordered components of the magnetic field are key parameters to characterise magnetic turbulence in the interstellar gas, which affects the propagation of cosmic rays within the Galaxy. We provide new constraints to those two parameters. We use the LOw Frequency ARray (LOFAR) to
Iacobelli, M., Haverkorn, M., Orrú, E., Pizzo, R. F., Anderson, J., Beck, R., Bell, M. R., Bonafede, A., Chyzy, K., Dettmar, R.-J., Ensslin, T. A., Heald, G., Horellou, C., Horneffer, A., Jurusik, W., Junklewitz, H., Kuniyoshi, M., Mulcahy, D. D., Paladino, R., Reich, W., Scaife, A., Sobey, C., Sotomayor-Beltran, C., Alexov, A., Bell, M. E., Asgekar, A., Avruch, I. M., van Bemmel, I., Bentum, M. J., Bernardi, G., Best, P., Birzan, L., Breitling, F., Broderick, J., Brouw, W. N., Brüggen, M., Butcher, H. R., Ciardi, B., Conway, J. E., de Gasperin, F., de Geus, E., Duscha, S., Eislöffel, J., Engels, D., Falcke, H., Fallows, R. A., Ferrari, C., Frieswijk, W., Garrett, M. A., Griessmeier, Jean-Mathias, Gunst, A. W., Hamaker, J. P., Hassall, T. E., Hessels, J. W. T., Hoeft, M., Hörandel, J., Jelic, V., Karastergiou, A., Kondratiev, V. I., Koopmans, L. V. E., Kramer, M., Kuper, G., van Leeuwen, J., Macario, G., Mann, G., Mckean, J. P., Munk, H., Pandey-Pommier, M., Polatidis, A. G., Röttgering, H., Schwarz, D., Sluman, J., Smirnov, O., Stappers, B. W., Steinmetz, M., Tagger, Michel, Tang, Y., Tasse, C., Toribio, C., Vermeulen, R., Vocks, C., Vogt, C., van Weeren, R. J., Wise, M. W., Wucknitz, O., Yatawatta, S., Zarka, P., Zensus, A.   +87 more
  +10 more sources

The GRB Afterglows Flowchart

Physical Sciences Forum, 2023
In this paper, we present a flowchart of the Gamma Ray Burst (GRB) afterglows, aiming to create a numerical FORTRAN code. Considering several proposed models, the hydrodynamic evolution describing the external shock of the jet with the environment ...
Esma Zouaoui, Noureddine Mebarki
doaj   +1 more source