3 edition of X-ray spectra of clusters of galaxies found in the catalog.
X-ray spectra of clusters of galaxies
by National Aeronautics and Space Administration, Goddard Space Flight Center in Greenbelt, Md
Written in English
|Statement||Richard F. Mushotzky|
|Series||NASA technical memorandum -- 86115|
|Contributions||Goddard Space Flight Center|
|The Physical Object|
We analyzed brief Chandra X-ray Observatory observations of 14 of these X-ray sources and found that eight are X-ray luminous clusters of galaxies, only one showing evidence for a central X-ray point source. The remaining six candidates turned out to be point-source dominated, with faint detections or upper limits on any extended emission. Considerable progress has been made over the past decade in the study of the evolutionary trends of the population of galaxy clusters in the Universe. In this review we focus on observations in the X-ray band. X-ray surveys with the satellite, supplemented by follow-up studies with and, have allowed an assessment of the evolution of the space density of clusters out to ≈ 1 and the evolution Cited by:
Observational Status X-ray observations of groups and clusters of galaxies have matured rapidly in the last 6 years with the advent of good quality imaging with Rosat and moderate quality spectra with ASCA, the Japanese-U.S. x-ray spectroscopy mission launched in February, Clusters of galaxies are visible tracers of the network of matter in the Universe, marking the high-density regions where filaments of dark matter Cited by:
Hard X-Ray Excesses in Clusters of Galaxies and Their Non-Thermal Origin. R. Fusco-Femiano. (seen in the spectra of distant sources) as signature of the WHIM. However, while there has been considerable optimism in attributing a substantial fraction of the cluster soft excess flux to WHIM emission, other work shows that, for example, the. The x-ray spectra of these galaxies are consistent with the hard spectra expected from binary x-ray sources, and the x-ray luminosities are linearly correlated with the emission in the optical B band, suggesting that the x-ray emission is mostly due to sources .
Listing of all HAZMAT incidents as reported to the Office of State Fire Marshal, 1986-June 1995.
Resourcing the National Health Service
The tasty chicken cookbook
Crown cases reserved for consideration and decided by the judges of England.
Beverly Lewis Mixed Prepack
Treaties and alliances of the world
Introduction to histochemical techniques
Amendments to the Council on Wage and Price Stability act
Sketch of the Borradailes of Cumberland
The religious lives of Sikh children
assessment of the feasibility of developing and implementing an automated pavement distress survey system incorporating digital image processing
Wood Cross with Brass Inlay and Pewter Girl Taking Communion
X-ray Spectroscopy of Clusters of Galaxies and of the cosmic Web Paperback – January 1, by Norbert Werner (Author) See all formats and editions Hide other formats and editions. Price New from Used from Paperback, Author: Norbert Werner.
Clusters of galaxies were established as a class of X-ray sources by observers on the Uhuru satellite (Gursky et al. These early results indicated that clusters were a powerful (L x in the 2–6 keV band > 10 44 erg/sec) and numerous (≳ 9) class of extra-galactic X-ray sources.
These early results also indicated that the sources were extended (Kellogg ; Kellogg and Murray ) with a Cited by: 5. Soft X-Ray Emission from Clusters of Galaxies and Related Phenomena. Editors: Lieu, R., Mittaz, Jonathan (Eds.) Free Preview.
Buy this book eB29 € price for Spain (gross) Buy eBook ISBN ; Digitally watermarked, DRM-free. X-ray spectroscopy has played a crucial role in the study of clusters of galaxies, possibly more so than in any other area.
In one stroke, the detection of iron line emission from clusters by Mitchell et al. () and Serlemitsos et al. () showed that the dominant X-ray emission mechanism is thermal bremsstrahlung and that the intracluster gas is enriched with heavy elements — since the iron line Cited by: 7.
First published inthis 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 by: An X-ray spectral analysis of 12 distant clusters of galaxies observed on-axis with the Einstein Observatory imaging proportional counter is presented.
Statistically, X-ray spectral data of the. X-ray images and spectra of clusters of galaxies show strong evidence for cooling flows. In many clusters, the hot gas in the core is cooling at rates of ∼ M⊙yr−1 and : Naomi Ota.
An X-ray spectral analysis of 12 distant clusters of galaxies observed on-axis with the Einstein Observatory imaging proportional counter is presented. Statistically, X-ray spectral data of the highest red shift clusters in the sample are inconsistent with an optically thin plasma emission model plus absorptions only in the Milky Way.
We perform a detailed X-ray study of the filaments surrounding the brightest cluster galaxies in a sample of nearby galaxy clusters using deep Chandra observations, namely the Perseus, Centaurus and Virgo clusters, and Abell We compare the X-ray properties and spectra of the filaments in all of these systems, and find that their Chandra X-ray spectra are all broadly consistent with an.
An observational description of X-ray clusters of galaxies is given based on OSO 8 X-ray results for spatially integrated spectra of 20 such clusters and various correlations obtained from these results.
X-ray line observations of clusters of galaxies have shown that the X-ray emission in clusters is mainly thermal emission from hot diffuse gas, and that much of this gas has come out of stars, probably having been ejected from galaxies in the cluster.
Emission lines in X–ray spectra of clusters of galaxies reveal the presence of heavy elements in the diffuse hot plasma (the Intra Cluster Medium, or ICM) in virial equilibrium in the dark matter potential well.
The relatively simple physical state of the ICM allows us to estimate. It is concluded that the X-ray emission from clusters of galaxies is due to a hot evolved intracluster gas with about 10% of the virial mass of the cluster.
The X-ray gas is direct evidence of a virial mass in the cluster. The gas interacts with the galaxies and may change their morphology. Now on home pageAuthor: R.
Mushotzky. of the X-ray spectra of the ICM. This means in particular that the spectrum we observe from a galaxy cluster provides an account of the entire ICM plasma, which is very different from, e.g. the spectra of stars, that provide information on merely a very thin skin on their surface.
This is another reason why cluster X-ray spectra are so. First published inthis 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. He is an expert on high-resolution X-ray spectroscopy of cosmic plasmas, and is currently principal investigator of the Reflection Grating Spectrometer on XMM-Newton and the Low-Energy Transmission Grating Spectrometer on Chandra.
He has an active track record on clusters of galaxies, active galactic nuclei and X-ray models for cosmic plasmas. Get this from a library. X-ray spectra of clusters of galaxies. [R F Mushotzky; Goddard Space Flight Center.]. We review the X-ray spectra of the cores of clusters of galaxies.
Recent high resolution X-ray spectroscopic observations have demonstrated a severe deficit of emission at the lowest X-ray temperatures as compared to that expected from simple radiative cooling by: The X-ray emission from luminous clusters of galaxies is dominated by thermal bremsstrahlung from an intergalactic medium.
The central density of the gas is strongly correlated with the. We detect a weak unidentified emission line at E=()+/ keV in a stacked XMM spectrum of 73 galaxy clusters spanning a redshift range MOS and PN observations independently show the presence of the line at consistent energies.
When the full sample is divided into three subsamples (Perseus, Centaurus+Ophiuchus+Coma, and all others), the line is significantly. X-Ray Sources in Globular Clusters.- Models for Galactic X-Ray Sources.- Binary X-Ray Pulsars.- 4. Normal Galaxies.- X-Ray Emission from Normal Galaxies.- 5.
Active Galaxies and QSO's (I).- Spectroscopy of Compact Extragalactic X-Ray Sources.- 6. Clusters of Galaxies.- Einstein Imaging Observations of Clusters of Galaxies.- X-Ray Spectra of Author: Riccardo Giacconi.2. X-RAY SPECTRA OF HOT TENUOUS PLASMA. The plasma of the ICM is very tenuous, with densities of 10 -5 to 10 -1 cm -3 from the cluster outskirts to the densest regions of cool core clusters.
This low plasma density makes the cluster X-ray spectra modeling simple and enables a very straightforward interpretation.contain not only galaxies and X-ray emitting hot gas, but also a huge amount of dark matter that, though not seen, is needed to bind the galaxies and hot gas in clusters.
Although the origin of the dark matter is still an open question, the Cold Dark Matter.