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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.
Our knowledge of the environment of the nucleus of our galaxy has been greatly enhanced, by more extensive and sensitive observations at radio and infrared wavelengths, the advent of high resolution x-ray imaging and spectroscopy, and considerable theoretical activity to understand the nucleus and its components, and their activity. The Galactic Center Workshop 2002 was organized to review recent research on the galactic center, including the latest state-of-the-art observations and important theoretical developments. The workshop covered phenomena on scales ranging from the central several hundred parsecs to the central parsec and within. Each topic was approached from both multi-wavelength observational and theoretical perspectives.
Proceedings of the August 1997 symposium. One hundred and ninety- four contributions present comparative studies on the data of the Milky Way and central regions of nearby galaxies. Included is information on galactic bulges, galactic center star clusters, star formation, starbursts, neutral ISM in the galactic center, molecular gas in the nuclei of galaxies, gas dynamics in the galactic center, the central parsecs of the milky way, magnetic and high-energy phenomena, black holes in galaxies, black hole in the galactic center, and black hole powering of AGN and jets. A sampling of topics: diffraction-limited IR speckle masking observations of the central regions of Seyfert galaxies, the stellar content of the Quintuplet cluster, and the structural characteristics of spiral bulges. Annotation copyrighted by Book News, Inc., Portland, OR
An insider's view of how the massive black hole was discovered at the Galactic Center.
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)
The one-stop general book on the whole of X-ray astronomy.
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.
"Hosted by Gemini Observatory during the week of November 3-8 in Hawaii. Called 'The Central 300 Parsecs, ' the conference was sponsored by several observatories on Mauna Kea to stimulate discussions on the galactic core. The conference was held at the Keauhou Beach Resort in Kailua-Kona, on the west side of the Big Island."-