Results 31 to 40 of about 729,930 (169)
Anisotropic Galactic Outflows and Enrichment of the Intergalactic Medium. I. Monte Carlo Simulations [PDF]
, 2006 We have developed an analytical model to describe the evolution of anisotropic galactic outflows. With it we investigate the impact of varying opening angle on galaxy formation and the evolution of the intergalactic medium. We have implemented this model
M. Pieri, H. Martel, C'edric Grenon
semanticscholar +1 more source
Synchrotron Self-Compton Analysis of TeV X-Ray-Selected BL Lacertae Objects [PDF]
, 2008 We introduce a methodology for analysis of multiwavelength data from X-ray-selected BL Lac (XBL) objects detected in the TeV regime. By assuming that the radio-through-X-ray flux from XBLs is nonthermal synchrotron radiation emitted by isotropically ...
J. Finke, C. Dermer, M. Boettcher
semanticscholar +1 more source
Modeling the He ii Transverse Proximity Effect: Constraints on Quasar Lifetime and Obscuration [PDF]
Astrophysical Journal, 2017 The He ii transverse proximity effect—enhanced He ii Lyα transmission in a background sightline caused by the ionizing radiation of a foreground quasar—offers a unique opportunity to probe the emission properties of quasars, in particular the emission ...
T. Schmidt +5 more
semanticscholar +1 more source
Intergalactic Travel and Riemann Hypothesis
, 2022 Immersing (not embedding) the figure-8 Klein bottle in the 3rd dimension + Imaginary time makes the 4th dimension both space and time (since the Klein is 2-dimensional, the statement in the file [in the section BITS AND TOPOLOGY] about a couple of two-dimensional Mobius strips uniting to form a three-dimensional figure-8 Klein bottle needs further ...
openaire +2 more sources
A 5G Beam Selection Machine Learning Algorithm for Unmanned Aerial Vehicle Applications
Wireless Communications and Mobile Computing, Volume 2020, Issue 1, 2020., 2020 The unmanned aerial vehicles (UAVs) emerged into a promising research trend within the recurrent year where current and future networks are to use enhanced connectivity in these digital immigrations in different fields like medical, communication, and search and rescue operations among others.
Hao Meng +4 more
wiley +1 more source
Effects of gamma-ray attenuation in the intergalactic medium [PDF]
, 2019 El espacio intergaláctico contiene campos de radiación y magnéticos que provienen de eras tempranas y que pueden dar información valiosa acerca de la historia cosmológica del Universo. La Luz Extragaláctica de Fondo (EBL) contiene toda la luz emitida por
Fernández Alonso, Mateo
core +1 more source
, 2018 The recent finding that gravitational waves (GW170817) traveled at the same speed as electromagnetic (EM) waves (GRB 170817A) from a binary neutron star merger does not necessarily mean that they traveled throughout their journey at speed c.
F. Tangherlini
semanticscholar +1 more source
Formation and spatial distribution of hypervelocity stars in AGN outflows [PDF]
, 2017 We study star formation within outflows driven by active galactic nuclei (AGN) as a new source of hypervelocity stars (HVSs). Recent observations revealed active star formation inside a galactic outflow at a rate of ∼ 15 M ⊙ yr − 1 .
Xiawei Wang, A. Loeb
semanticscholar +1 more source
The Magnetic Field in Galaxies, Galaxy Clusters, and the InterGalactic Space
, 2005 Magnetic fields of debated origin appear to permeate the Universe on all large scales. There is mounting evidence that supernovae produce not only roughly spherical ejecta and winds, but also highly relativistic jets of ordinary matter. These jets, which
De Rújula, Alvaro, Dar, A
core +1 more source
Astronomische Nachrichten, EarlyView.ABSTRACT The goal of this study is to confirm the feasibility of the use of digitized low dispersive MtWilson Michigan Southern Sky Hα$$ \alpha $$ survey astronomical photographic plates for modern astrophysical research. The detection of highly redshifted objects, such as early galaxies and quasars, is fundamental to understanding the universe's ...
Tauseef Ahmad Zafar +3 more
wiley +1 more source