Download or read book COMPTEL Observations of the Quasars 3C 273 and 3C 279 written by and published by . This book was released on 1994 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Detailed Ultraviolet Observations of the Quasar 3C 273 with IUE written by M. H. Ulrich and published by . This book was released on 1980 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Observations of the Jet of the Quasar 3C 273 written by Amy J. Lovell and published by . This book was released on 1990 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Quasars and Active Galactic Nuclei written by Ajit K. Kembhavi and published by Cambridge University Press. This book was released on 1999-03-11 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: The latest observations and theoretical models are combined in this clear, pedagogic textbook for advanced undergraduates and graduate students.

Download or read book Simultaneous and Quasi simultaneous Observations of the Continuum Emission of the Quasar 3C 273 from Radio to Gamma ray Energies written by and published by . This book was released on 1994 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclei in the Cosmos written by F Kappeler and published by CRC Press. This book was released on 2020-11-25 with total page 663 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclei in the Cosmos, a volume of conference papers, gathers together astronomers, astrophysicists, and nuclear physicists for a thorough discussion of nucleosynthesis, its role in the evolution of the universe, and its intriguing possibilities as a diagnostic tool for stellar interiors. Nineteen invited papers provide a solid review of nucleosynthesis topics, and approximately another 70 papers bring you up-to-date on the forefront of research in this quickly-developing area.

Download or read book Particle Astrophysics written by Gérard Fontaine and published by Atlantica Séguier Frontières. This book was released on 1993 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Second Compton Symposium written by N. Gehrels and published by American Inst. of Physics. This book was released on 1998-03-19 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Proceedings of a conference held in College Park, Maryland, in September 1993. Papers discuss results from the Compton Gamma Ray Observatory, in orbit since 1991. Presentations are divided into sections on opening remarks, spin-powered pulsars, nucleosynthesis, galactic sources, galactic center, cosmic rays and galactic diffusion radiation, agn-seyferts, agn-quasars and bl lacs, and analysis and instrumentation. No index. Annotation c. by Book News, Inc., Portland, Or.

Download or read book COMPTEL Gamma ray Observations of the Quasars CTA 102 and 3c 454 3 written by and published by . This book was released on 1994 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Frontiers Of Space And Ground Based Astronomy written by Willem Wamsteker and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 721 pages. Available in PDF, EPUB and Kindle. Book excerpt: ROSAT Observations G. HASINGER Max-Planck-Institut flir extraterrestrische Physik, D-85740 Garching, Germany Abstract. This review describes the most recent advances in the study of the extragalactic soft X-ray background and what we can learn about its constituents. The deepest pointed observations with the ROSAT PSPC are discussed. The logN-logS relation is presented, which reaches to the faintest X-ray fluxes and to the highest AGN surface densities ever achieved. The N(>S) relation shows a 2 density in excess of 400 deg- at the faintest fluxes and a flattening below the Einstein Deep Survey limit. About 60% of the extragalactic background has been resolved in the deepest field. Detailed source spectra and first optical and radio identifications will be discussed. The results are put into perspective of the higher energy X -ray background. Key words: X-rays, background radiations, active galactic nuclei. 1. Introduction The extragalactic X-ray background (XRB), discovered about 30 years ago, has been studied extensively with many X-ray experiments, in particular with the satel lites HEAO I and II (see ego Boldt 1987) and with ROSAT (e. g. Hasinger et aI. , 1993). Figure 1 shows a compilation of some of the most recent spectral measure ments for the X-ray background. Over the energy range from 3 to about 100 keY its spectrum can be well approximated by an optically thin thermal bremsstrahlung model with kT ~ 40 keY, while at lower X-ray energies a steepening into a new component has been observed observed (e. g.

Download or read book Contributed Papers written by and published by . This book was released on 1997 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Current Topics In Astrofundamental Physics Proceedings Of The 2nd Course In The International School Of Astrophysics D Chalonge written by Normalized Sanchez and published by World Scientific. This book was released on 1993-08-27 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an updated understanding of the progress and current problems in the interplay between fundamental physics, astrophysics and cosmology.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1993 with total page 1018 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Space Astronomy written by COSPAR. Plenary Meeting and published by Elsevier Science & Technology. This book was released on 1993 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers presented in this volume are taken from several meetings held during the World Space Congress. They include papers on X-ray and EUV astronomy research and results from recent space missions. A section on infrared and submillimeter astronomy also forms part of this volume.

Download or read book Handbook of X ray and Gamma ray Astrophysics written by Cosimo Bambi and published by Springer Nature. This book was released on with total page 5912 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Astronomy and Astrophysics written by and published by . This book was released on 1994 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Multiwavelength and Polarimetric Analysis of the Flat Spectrum Radio Quasars 3C 273 and 3C 279 written by Sunil Anthony Fernandes and published by . This book was released on 2016 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents results of multiwavelength analyses of 3C 273 and 3C 279. The main goals were to identify the gamma-ray emission region and dominant high-energy emission processes. Our methodology consisted of analyzing light curves from radio to gamma-rays over 6 - 8 years and polarimetric, spectral and line emission behavior. In 3C 279, we found that the emission from millimeter to ultraviolet was simultaneous and therefore co-spatial. We identified two active states where different high-energy emission processes were dominant. We found multiwavelength flaring events consistent with component ejections and shocks. We proposed that the gamma-ray emission region changed over time based on observations of both simultaneous and delayed gamma-rays emission with respect to low-energy emission during different time-frames. In 3C 273, we identified a non-thermal flare related to a component ejection and a thermal flare related to accretion. From reverberation mapping we found that the broad line region dynamical behavior over time possibly affects the derived supermassive black hole mass. In both objects we found that the gamma-ray spectral index was variable, and a trend of harder spectral index with higher gamma-ray luminosity. From the identification of different dominant high-energy emission processes, we concluded that the dominant high-energy emission mechanism changes with time. Overall, we concluded that similar results from both objects points to behavior that is potentially common to flat spectrum radio quasars. Increasing the sample size of objects analyzed with similar methodologies will provide more results to confirm or refine our conclusions.