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Suzaku Studies of White Dwarf Stars and the Galactic X-ray Background Emission
This thesis presents a study of the origin of an apparently extended X-ray emission associated with the Galactic ridge. The study was carried out with broadband spectra obtained from mapping observations in the Galactic bulge region conducted in 2005–2010 by the Suzaku space X-ray observatory. The spectra were analyzed with a newly constructed X-ray spectral model of an accreting white dwarf binary that is one of the proposed candidate stars for the origin of the Galactic ridge emission in the higher energy band. Fitting of the observed Galactic ridge spectra with the model showed that there is another spectral component that fills the gap between the observed X-ray flux and the component expected from the accreting white dwarf spectral model in the lower energy band. This additional soft spectral component was nicely explained by an X-ray spectral model of normal stars. The result, together with previously reported high-resolution imaging results, strongly supports the idea that the Galactic ridge X-ray emission is an assembly of dim, discrete X-ray point sources.
The Hot Universe
The present decade is opening new frontiers in high-energy astrophysics. After the X-ray satellites in the 1980's, including Einstein, Tenma, EXOSAT and Ginga, several satellites are, or will soon be, simultaneously in orbit offering spectacular advances in X-ray imaging at low energies (ROSATj Yohkoh) as well as at high energies (GRANAT), in spectroscopy with increased bandwidth (ASCAj SAX), and in timing (XTE). While these satellites allow us to study atomic radiation from hot plasmas or energetic electrons, other satellites study nuclear radiation at gamma-ray energies (CGRO) associated with radioactivity or spallation reactions. These experiments show that the whole universe is emitting ...
Populations of High-Energy Sources in Galaxies (IAU S230)
For the last 40 years astronomers have observed sources of intense X-ray radiation from beyond our Solar System. These have been associated with remarkable objects, such as neutron stars and black holes. Current satellite observatories have enabled us to extend the studies of these objects from the Milky Way and Magellanic Clouds to individual X-ray sources in other galaxies. At the same time, imaging facilities at gamma-rays and TeV energies have improved enormously, leading to many further discoveries within our own galaxy. This Symposium presents an overview of these new developments, covering detailed studies of individual sources within the Milky Way, global descriptions of X-ray source populations in other galaxies, and less resolved relatives at high redshift. Galaxy nuclei and diffuse emission components are included, as are new discoveries at gamma-rays and TeV energies. IAU S230 is a valuable resource for astronomers and graduates working in high-energy astrophysics.
Exploring the X-Ray Universe
The one-stop general book on the whole of X-ray astronomy.
Gj139
GJ139, turning right on SETI brings reality to the SETI field by describing how difficult it is to accomplish SETI while at the same time providing possibilities and ways to accomplish it. The book discusses, where, when, why and how of SETI from the technical issues down to the ethical ones. The first and last chapters are science fiction while the rest is science.The science sections describe millimeter wave SETI (unlike the water hole SETI being done) and introduces chapters on the SETI unknowns: signal types, modulation, decoding and synchronization.The book has many appendices including letters on Enrico Fermi's famous "where are they?" statement, a speech given at NASA's first Astrobiology conference and a list of Millimeter wave telescopes that could be used for SETI.Written by Peter P. Vekinis, (Amateur radio callsigns: KH6VP, LX1QF, EI4GV, VE3PPV, SV0GV)
Origin of Matter & Evolution of Galaxies 2000
This book focuses on current topics in astronomy, astrophysics and nuclear astrophysics. The areas covered are: origin of the universe and nucleosynthesis; chemical and dynamical evolution of galaxies; nova/supernova and evolution of stars; astrophysical nuclear reaction; structure of nuclei with unstable nuclear beams; origin of the heavy element and age of the universe; neutron star and high density matter; observation of elements; high energy cosmic rays; neutrino astrophysics.
The Central Regions of the Galaxy and Galaxies
Proceedings of the 184th Symposium of the International Astronomical Union, held in Tokyo, Japan, 18-22 August 1997
Mapping the Galaxy and Nearby Galaxies
Readers with any kind of an interest in astronomy will find this work fascinating, detailing as it does the proceedings of the symposium of the same name held in Japan in 2006. The symposium focused on mapping the interstellar media and other components in galactic disks, bulges, halos, and central regions of galaxies. Thanks to recent progress in observations using radio interferometers and optical/infrared telescopes in ground and space, our knowledge on structures of our Galaxy and nearby galaxies has been growing for the last decade.
Highlights of Astronomy: Volume 14
Recording the proceedings of the IAU XXVI General Assembly, this volume of the IAU Highlights of Astronomy covers virtually all aspects of modern astrophysics as discussed by 2400 participants from 73 countries. Notably, the common aspects of astrophysical phenomena known to exist in widely differing interstellar environments is thoroughly examined, providing fertile cross correlation from one specialisation to another. This text highlights the importance of the triennial IAU General Assemblies in bringing together the work of observers and theoreticians in widely different fields, but working towards a common goal: understanding the physics of the Universe. Together with the Proceedings of the IAU Symposia 235-240, this volume examines all of the astrophysics presented at the General Assembly.
