Results 31 to 40 of about 46,290 (218)

Open Questions in Cosmic-Ray Research at Ultrahigh Energies

Frontiers in Astronomy and Space Sciences, 2019
We review open questions and prospects for progress in ultrahigh-energy cosmic ray (UHECR) research, based on a series of discussions that took place during the “The High-Energy Universe: Gamma-Ray, Neutrino, and Cosmic-ray Astronomy” MIAPP workshop in ...
Rafael Alves Batista, Jonathan Biteau, Mauricio Bustamante, Klaus Dolag, Klaus Dolag, Ralph Engel, Ke Fang, Karl-Heinz Kampert, Dmitriy Kostunin, Miguel Mostafa, Kohta Murase, Kohta Murase, Foteini Oikonomou, Angela V. Olinto, Mikhail I. Panasyuk, Guenter Sigl, Andrew M. Taylor, Michael Unger   +17 more
doaj   +1 more source

All-sky Galactic radiation at 45 MHz and spectral index between 45 and 408 MHz

, 2010
Aims: We study the Galactic large-scale synchrotron emission by generating a reliable all-sky spectral index map and temperature map at 45 MHz. Methods: We use our observations, the published all-sky map at 408 MHz, and a bibliographical compilation to ...
A. E. Guzmán, Allen, Alvarez, Alvarez, Alvarez, Andrew, Andrews, Ariskin, Baldwin, Berkhuijsen, Blythe, Bolton, Bridle, Cane, Caswell, Clark, de Oliveira-Costa, Dröge, Dwarakanath, Ellis, Ellis, Ellis, Fukao, Fukao, Gervasi, H. Alvarez, Hamilton, Hamilton, Han, Hanbury Brown, Hartz, Haslam, Haslam, Haslam, Heiles, Hill, Hill, Hornby, Howell, J. May, Jones, K. Maeda, Ko, Lallement, Landecker, Large, Lawson, Maeda, Mathewson, May, Milogradov-Turin, Moran, Pauliny-Toth, Piddington, Piddington, Price, Purton, Reich, Reich, Reich, Reich, Reich, Roger, Rohan, Seeger, Shain, Shain, Simon, Sironi, Sun, Testori, Turtle, Véron, Wall, Webster, Wielebinski, Wolleben, Yates, Yates, Yates   +79 more
core   +1 more source

Fast Radio Burst Discovered in the Arecibo Pulsar ALFA Survey [PDF]

, 2014
Recent work has exploited pulsar survey data to identify temporally isolated, millisecond-duration radio bursts with large dispersion measures (DMs). These bursts have been interpreted as arising from a population of extragalactic sources, in which case ...
Allen, B., Aulbert, C., Bogdanov, S., Brazier, A., Camilo, F., Chatterjee, S., Cordes, J. M., Crawford, F., Deneva, J. S., Fehrmann, H., Freire, P. C. C., Hessels, J. W. T., Jenet, F. A., Karako-Argaman, C., Kaspi, V. M., Knispel, B., Lazarus, P., Lee, K. J., Lorimer, D. R., Lynch, R., Lyne, A. G., McLaughlin, M. A., Ransom, S. M., Scholz, P., Siemens, X., Spitler, L. G., Stairs, I. H., Stovall, K., Swiggum, J. K., van Leeuwen, J., Venkataraman, A., Wharton, R. S., Zhu, W. W.   +32 more
core   +4 more sources

Radial Profiles of Σ*, ΣSFR, Gas Metallicity, and Their Correlations across the Galactic Mass–Size Plane

The Astrophysical Journal
We analyzed the global and resolved properties of approximately 1240 nearby star-forming galaxies from the MaNGA survey, comparing compact and extended galaxies—those with smaller and larger radii ( R _e ), respectively—at a fixed stellar mass ( M _ ...
Lin Lin, Shiyin Shen, Hassen M. Yesuf, Ye-Wei Mao, Lei Hao   +4 more
doaj   +1 more source

The Chinese Radio Telescope Array for Interplanetary Scintillation Monitoring

Space Weather, Volume 24, Issue 1, January 2026.
Abstract Solar flares, coronal mass ejections (CMEs) and enegertic particles, etc., are the driving sources that may cause catastrophic space weathers. It is desirable to obtain information of solar eruptions like flares and CMEs, etc., propagating from the Sun to the near‐Earth space.
Yihua Yan, Wei Wang, Jin Fan, Ming Xiong, Zhijun Chen, Linjie Chen, Cang Su, Sha Li, Jun Cheng, Jing Du, Xueshang Feng   +10 more
wiley   +1 more source

New Synoptic Observations of the Cosmic Optical Background with New Horizons

The Astrophysical Journal
We obtained New Horizons LORRI images to measure the cosmic optical background (COB) intensity integrated over 0.4 μ m ≲ λ ≲ 0.9 μ m. The survey comprises 16 high-Galactic-latitude fields selected to minimize scattered diffuse Galactic light (DGL) from ...
Marc Postman, Tod R. Lauer, Joel W. Parker, John R. Spencer, Harold A. Weaver, J. Michael Shull, S. Alan Stern, Pontus Brandt, Steven J. Conard, G. Randall Gladstone, Carey M. Lisse, Simon B. Porter, Kelsi N. Singer, Anne. J. Verbiscer   +13 more
doaj   +1 more source

Radial and Local Density Dependence of Star Formation Properties in Galaxy Clusters from the Hyper Suprime-Cam Survey

The Astrophysical Journal, 2023
This study examines the impact of cluster environments on galaxy properties using data from the Hyper Suprime-Cam Subaru Strategic Program and an optically selected CAMIRA cluster sample.
Hung-Yu Jian, Lihwai Lin, Bau-Ching Hsieh, Keiichi Umetsu, Carlos Lopez-Coba, Masamune Oguri, Connor Bottrell, Yoshiki Toba, Yusei Koyama, Yu-Yen Chang, Tadayuki Kodama, Yutaka Komiyama, Surhud More, Kai-Yang Lin, Atsushi J. Nishizawa, Ichi Tanaka   +15 more
doaj   +1 more source

The Stochastic‐Dissipative Störmer Problem‐Trajectories and Radiation Patterns

Annalen der Physik, Volume 537, Issue 12, December 2025.
We consider charged particle motion and radiation in a dipole magnetic field, in the presence of friction and of stochastic forces. The numerical solutions of the Langevin equation reveal how these forces modify the complex dynamics of particles, and they offer some new insights into the nonlinear processes relevant to planetary radiation belts ...
Tiberiu Harko, Gabriela Raluca Mocanu
wiley   +1 more source

Evolution of Low Surface Brightness Ultrathin Galaxies: The Role of Dark Matter Halo and Bar Formation on Disk Thickness

The Astrophysical Journal
We investigate how stellar disks sustain their ultrathin structure throughout their evolution. We follow the evolution of ultrathin stellar disks with varying dark matter (DM) halo concentration ( c ) using collisionless N -body simulations with AREPO ...
K. Aditya, Arunima Banerjee
doaj   +1 more source

The Galactic Contribution to IceCube's Astrophysical Neutrino Flux

, 2017
High energy neutrinos have been detected by IceCube, but their origin remains a mystery. Determining the sources of this flux is a crucial first step towards multi-messenger studies.
Denton, Peter B., Marfatia, Danny, Weiler, Thomas J.   +2 more
core   +1 more source