X Ray Emitting Ghz Peaked Spectrum Galaxies PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download X Ray Emitting Ghz Peaked Spectrum Galaxies PDF full book. Access full book title X Ray Emitting Ghz Peaked Spectrum Galaxies.
Author | : |
Publisher | : |
Total Pages | : 29 |
Release | : 2010 |
Genre | : |
ISBN | : |
Download X-ray Emitting GHz-Peaked Spectrum Galaxies Book in PDF, ePub and Kindle
In a dynamical-radiative model we recently developed to describe the physics of compact, GHz-Peaked-Spectrum (GPS) sources, the relativistic jets propagate across the inner, kpc-sized region of the host galaxy, while the electron population of the expanding lobes evolves and emits synchrotron and inverse-Compton (IC) radiation. Interstellar-medium gas clouds engulfed by the expanding lobes, and photoionized by the active nucleus, are responsible for the radio spectral turnover through free-free absorption (FFA) of the synchrotron photons. The model provides a description of the evolution of the GPS spectral energy distribution (SED) with the source expansion, predicting significant and complex high-energy emission, from the X-ray to the [gamma]-ray frequency domain. Here, we test this model with the broad-band SEDs of a sample of eleven X-ray emitting GPS galaxies with Compact-Symmetric-Object (CSO) morphology, and show that: (i) the shape of the radio continuum at frequencies lower than the spectral turnover is indeed well accounted for by the FFA mechanism; (ii) the observed X-ray spectra can be interpreted as non-thermal radiation produced via IC scattering of the local radiation fields off the lobe particles, providing a viable alternative to the thermal, accretion-disk dominated scenario. We also show that the relation between the hydrogen column densities derived from the X-ray (N{sub H}) and radio (N{sub HI}) data of the sources is suggestive of a positive correlation, which, if confirmed by future observations, would provide further support to our scenario of high-energy emitting lobes.
Author | : Xavier Barcons |
Publisher | : Cambridge University Press |
Total Pages | : 328 |
Release | : 1992-07-31 |
Genre | : Nature |
ISBN | : 9780521416511 |
Download The X-ray Background Book in PDF, ePub and Kindle
A review of the current observational knowledge and understanding of the cosmic X-ray background.
Author | : Craig L. Sarazin |
Publisher | : Cambridge University Press |
Total Pages | : 0 |
Release | : 1988-03-17 |
Genre | : Science |
ISBN | : 9780521329576 |
Download X-Ray Emission from Clusters of Galaxies Book in PDF, ePub and Kindle
First published in 1988, this book is a comprehensive survey of the astrophysical characteristics of the hot gas which pervades clusters of galaxies. In our universe, clusters of galaxies are the largest organised structures. Typically they comprise hundreds of galaxies moving through a region of space ten million light years in diameter. The volume between the galaxies is filled with gas having a temperature of 100 million degrees. This material is a strong source of cosmic X-rays. Dr Sarazin describes the theoretical description of the origin, dynamics, and physical state of the cluster gas. Observations by radio and optical telescopes are also summarised. This account is addressed to professional astronomers and to graduate students. It is an exhaustive summary of a rapidly expanding field of research in modern astrophysics.
Author | : Yoel Rephaeli |
Publisher | : |
Total Pages | : 252 |
Release | : 1977 |
Genre | : Galaxies |
ISBN | : |
Download X-ray Emission from Clusters of Galaxies Book in PDF, ePub and Kindle
Author | : W.C. Seitter |
Publisher | : Springer Science & Business Media |
Total Pages | : 500 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 9401110220 |
Download Cosmological Aspects of X-Ray Clusters of Galaxies Book in PDF, ePub and Kindle
The NATO Advanced Study Institute "Cosmological Aspects of X-Ray Clus ters of Galaxies" took place in Vel en , Westphalia, Germany, from June 6 to June 18, 1993. It addressed the fruitful union of two topics, cosmology and X-ray clus ters, both of which carry substantial scientific weight at the beginning of the last decenium of the last century in the second millenium of our era. The so far largest X-ray "All-Sky Survey", observed by the ROSAT X-ray satel lite, and ROSAT's deep pointed observations, have considerably enlarged the base of X-ray astronomy, particularly concerning extragalactic sources. Cosmology has gained significant impetus from the large optical direct and spectroscopic surveys, based on high quality 2-dimensional receivers at large telescopes and powerful scan ning devices, harvesting the full information 1 content from the older technique of employing photographic plates. Radioastronomy and IR-astronomy with IRAS, as well as r-astronomy with GRO, continue and strengthen the role of extragalactic research. The rapidly growing computer power in data reduction and data storage facilities support the evolution towards large-number statistics. A most significant push was given to early cosmology by the needs of physics in trying to unravel the nature of forces which govern our material world. The topic of the ASI was chosen because it opens new vistas on this for ever new problem: the universe. Clusters of galaxies probe large-scale matter distributions and the structure of space-time.
Author | : Mark Jeffrey Henriksen |
Publisher | : |
Total Pages | : 232 |
Release | : 1985 |
Genre | : Galaxies |
ISBN | : |
Download The Physical Characteristics of the X-ray Emitting Gas in Clusters of Galaxies and Constraints on Dark Matter Book in PDF, ePub and Kindle
Author | : Dorit Glawion |
Publisher | : MDPI |
Total Pages | : 188 |
Release | : 2020-05-13 |
Genre | : Science |
ISBN | : 3039287508 |
Download Radio Galaxies at TeV Energies Book in PDF, ePub and Kindle
It is common believe that the centers of all galaxies exhibit supermassive black holes with masses ranging from millions up to billions of the mass of our Sun. By accreting surrounding matter, the luminosity of these galactic nuclei can outshine the emission of their host galaxies. If this is the case, they are called active galactic nuclei. Some of these objects eject powerful outflows composed of plasma, called jets. These jets can produce non-thermal radiation which observable across the entire electromagnetic spectrum from radio up to the gamma-ray frequencies. At highest frequencies (TeV range) most of the detected active galaxies have jets directed along or close to the line of sight. However, also galaxies with larger angles to the line of sight showing fascinating features were discovered, in seeming contradiction to traditional models for these so-called radio galaxies. Thus, the latter are of particular importance for understanding active galactic nuclei in general. This Special Issue contains reviews and research articles about the current knowledge of radio galaxies at TeV energies, including observational results and theoretical models. It is intended to guide the interested reader deeper into this fascinating discipline of modern day astronomy.
Author | : Jimmy Andrew Irwin |
Publisher | : |
Total Pages | : 308 |
Release | : 1997 |
Genre | : |
ISBN | : |
Download X-ray Emission in Early-type Galaxies Book in PDF, ePub and Kindle
Author | : Vincenzo Antonuccio-Delogu |
Publisher | : Cambridge University Press |
Total Pages | : 219 |
Release | : 2010-10-28 |
Genre | : Science |
ISBN | : 1139492152 |
Download AGN Feedback in Galaxy Formation Book in PDF, ePub and Kindle
During the past decade, convincing evidence has been accumulated concerning the effect of active galactic nuclei (AGN) activity on the internal and external environment of their host galaxies. Featuring contributions from well-respected researchers in the field, and bringing together work by specialists in both galaxy formation and AGN, this volume addresses a number of key questions about AGN feedback in the context of galaxy formation. The topics covered include downsizing and star-formation time scales in massive elliptical galaxies, the connection between the epochs of supermassive black hole growth and galaxy formation and the question of whether AGN and star formation coexist. Authors also discuss key challenging computational problems, including jet-interstellar/intergalactic medium interactions, and both jet- and merging-induced star formation. Suitable for researchers and graduate students in astrophysics, this volume reflects the engaging and lively discussions taking place in this emerging field of research.
Author | : R. Beck |
Publisher | : Springer |
Total Pages | : 0 |
Release | : 1990-04-30 |
Genre | : Science |
ISBN | : 9780792307044 |
Download Galactic and Intergalactic Magnetic Fields Book in PDF, ePub and Kindle
This Symposium, the first devoted entirely to the measurement and the role of magnetic fields in the non-solar Universe, was held in Heidelberg, on June 19-23, 1989. The meeting began with review talks on magnetic phenomena near the solar photosphere, corona, and in stellar winds, since these nearby "laboratories", studied for many years, provide much of the prior knowl edge of magnetic effects in astrophysical plasmas. The Symposium contained presentations of considerable new work concerning the role of magnetic fields in accretion disks, bipolar outflows, and related magnetic phenomena in molecular clouds and star forming regions. Both observa tions and related theory of the large-scale magnetic fields in the Milky Way were covered, in addition to a session on the more general theme of magnetohydrodynamics of galactic magnetic fields. Dynamo mechanisms were discussed in considerable detail. It was apparent that recent observational data on polarized emission from external galaxies are now of sufficiently high quality that meaningful tests of large-scale field amplification, and of ideas on the origin of galactic magnetic fields, can be undertaken. Both new observations and numerical simulation work were described in the context of active galaxy nuclei, supernova remnants, radio source jets and extended lobes, and also in the environment of galaxy clusters. Recent large-scale computer simulations incorporating magnetic fields in star formation, radio source jets, and many other phenomena were presented, and much of this was very new.