Topic
Synchrotron radiation
About: Synchrotron radiation is a research topic. Over the lifetime, 14639 publications have been published within this topic receiving 244775 citations. The topic is also known as: magnetobremsstrahlung radiation & Synchrotron Radiation.
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TL;DR: In this article, the intensity and angular fluctuations of the radio synchrotron background that results from the same high-energy electrons as well as the expected angular fluctuations in the γ-ray background were calculated.
Abstract: The shocks produced in the intergalactic medium during large-scale structure formation accelerate a population of highly relativistic electrons that emit synchrotron radiation due to intergalactic magnetic fields. In a previous paper we have shown that these electrons cool primarily by inverse Compton scattering of the microwave background photons and can thereby produce the observed intensity and spectrum of the diffuse γ-ray background. Here we calculate the intensity and angular fluctuations of the radio synchrotron background that results from the same high-energy electrons as well as the expected angular fluctuations in the γ-ray background. On angular scales smaller than a degree, the predicted fluctuations in the microwave background temperature are of order 40 μK(ξB/0.01)(ν/10 GHz)-3, where ξB is the magnetic fraction of the postshock energy density. This foreground might have already dominated the anisotropy signal detected in existing low-frequency cosmic microwave background experiments and can be identified with confidence through multifrequency observations. Detection of the synchrotron fluctuations would allow us to determine the strength of the intergalactic magnetic field. We predict a strong correlation between high-resolution maps taken at low-frequency radio waves and at high-energy γ-rays. Young X-ray clusters may also appear as radio or γ-ray clusters. The detailed study of this correlation will become easily accessible with the future launch of the Gamma-Ray Large-Area Space Telescope.
62 citations
TL;DR: In this paper, the authors report the improvements achieved during a recent upgrade from SURF II to SURF III and their strategy to accurately determine the magnetic flux density, radio frequency (RF), beam current, and beam size, which are the parameters necessary to characterize the source completely.
Abstract: The National Institute of Standards and Technology (NIST) operates the newly upgraded Synchrotron Ultraviolet Radiation Facility (SURF III) mainly as a light source for radiometry. SURF III provides continuum radiation from the far-infrared to the soft X-ray spectral range and has its peak output in the extreme ultraviolet. SURF III is a circular-orbit, weak-focusing (single dipole magnet) storage ring, a feature which is advantageous if the synchrotron radiation output is calculated. We report the improvements achieved during a recent upgrade from SURF II to SURF III and our strategy to accurately determine the magnetic flux density, radio frequency (RF), beam current, and beam size, which are the parameters necessary to characterize the source completely.
62 citations
TL;DR: The impact of infrared synchrotron radiation in biology: Past, present and future is discussed in this paper, where the authors focus on the past, present, and future.
Abstract: (2000). The impact of infrared synchrotron radiation in biology: Past, present and future. Synchrotron Radiation News: Vol. 13, No. 5, pp. 31-38.
62 citations
TL;DR: In this article, an angular power spectrum analysis (APS) of all-sky total intensity maps at 408 MHz and 1420 MHz was performed to improve current estimates of the influence of synchrotron emission on the analysis of CMB anisotropies.
Abstract: Context. Galactic foreground emission fluctuations are a limiting factor for precise cosmic microwave background (CMB) anisotropy measurements. Aims. We intend to improve current estimates of the influence of Galactic synchrotron emission on the analysis of CMB anisotropies. Methods. We perform an angular power spectrum analysis (APS) of all-sky total intensity maps at 408 MHz and 1420 MHz, which are dominated by synchrotron emission out of the Galactic plane. We subtract the brighter sources from the maps, which turns out to be essential for the results obtained. We study the APS as a function of Galactic latitude by considering various cuts and as a function of sky position by dividing the sky into patches of ∼15 ◦ × 15 ◦ in size. Results. The APS of the Galactic radio diffuse synchrotron emission is best fitted by a power law, C� ∼ k� α , with α ∈ [−3.0, −2.6], where the lower values of α typically correspond to the higher latitudes. Nevertheless, the analysis of the patches reveals that strong local variations exist. A good correlation is found between the APS normalized amplitude, k100 = k×100 α , at 408 MHz and 1420 MHz. The mean APS for � ∈ [20, 40] is used to determine the mean spectral index between 408 MHz and 1420 MHz, β(0.408−1.4) GHz ∈ [−3.2, −2.9] (C� (ν) ∝ ν −2β ), which is then adopted to extrapolate the synchrotron APS results to the microwave range. Conclusions. We use the 408 MHz and 1420 MHz APS results to predict the Galactic synchrotron emission fluctuations at frequencies above 20 GHz. A simple extrapolation to 23 GHz of the synchrotron emission APS found at these radio frequencies does not explain all the power in the WMAP synchrotron component even at middle/high Galactic latitudes. This suggests a significant microwave contribution (of about 50% of the signal) by other components such as free-free or spinning dust emission. The comparison between the extrapolated synchrotron APS and the CMB APS shows that a mask excluding the regions with |bgal| < 5 ◦ would reduce the foreground fluctuations to about half of the cosmological ones at 70 GHz even at the lowest multipoles. The main implications of our analysis for the cosmological exploitation of microwave temperature anisotropy maps are discussed.
62 citations
29 Jan 2018
TL;DR: It is clear that malignant human cancers’ cells, tissue and tumors have gradually transformed to benign human cancers' cells, tissues and tumors under synchrotron radiation with the passage of time.
Abstract: In the current study, we have experimentally and comparatively investigated and compared malignant human common cancers’ cells, tissues and tumors such as Bladder Cancer, Breast Cancer, Colon and Rectal Cancer, Endometrial Cancer, Kidney Cancer, Leukemia, Liver, Lung Cancer, Melanoma, Non–Hodgkin Lymphoma, Pancreatic Cancer, Prostate Cancer and Thyroid Cancer before and after irradiating of synchrotron radiation therapy process using some modern biospectroscopic techniques and methods. It is clear that malignant human cancers’ cells, tissues and tumors have gradually transformed to benign human cancers’ cells, tissues and tumors under synchrotron radiation with the passage of time (Figures 1-13) [1–123].
61 citations