Mostrando 221 - 240 Resultados de 263 Para Buscar '"quásar"', tiempo de consulta: 0.24s Limitar resultados
  1. 221
    por De Rújula, Alvaro
    Publicado 2004
    “…The mechanism underlying these phenomena is the emission of relativistic "cannonballs" by ordinary supernovae, analogous to the observed ejection of plasmoids by quasars and microquasars. I concentrate on Cosmic Rays: the longest-lasting conundrum in astrophysics. …”
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  2. 222
    “…Drawing on recent breakthroughs in astrophysics and biochemistry, Chaisson explores the development of the most microscopic and the most immense aspects of our universe, including the idea that all objects-from quarks and quasars to microbes and minds-are interrelated. Epic of Evolution is a stunning view of how various changes, operating across almost incomprehensible domains of space and nearly inconceivable stretches of time-all by means of the cosmic evolutionary combination of chance and necessity-have given rise to our galaxy, our star, our planet, and ourselves.…”
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  3. 223
    “…Seven observations point towards the existence of primordial black holes (PBH), constituting the whole or an important fraction of the dark matter in the Universe: the mass and spin of black holes detected by Advanced LIGO/VIRGO, the detection of micro-lensing events of distant quasars and stars in M31, the non-detection of ultra-faint dwarf satellite galaxies with radius below 15 parsecs, evidences for core galactic dark matter profiles, the correlation between X-ray and infrared cosmic backgrounds, and the existence of super-massive black holes very early in the Universe's history. …”
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  4. 224
    por Walker, Richard
    Publicado 2017
    “…It also presents integrated spectra of stellar clusters, galaxies and quasars, and the reference spectra of some terrestrial light sources, for calibration purposes. …”
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    Enlace del recurso
  5. 225
    “…Volume 67 records 10,903 papers covering besides the classical fields of astronomy and astrophysics such matters as space flights related to astronomy, lunar and planetary probes and satellites, meteorites and interplanetary matter, X rays and cosmic rays, quasars and pulsars. The abstracts are classified under more than one hundred subject categories thus permitting quick surveying of the bulk of material published on the same topic within six months. …”
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    Enlace del recurso
  6. 226
    “…Gravitational lensing has significantly improved our knowledge of many astrophysical phenomena, such as exoplanets, galaxies, active galactic nuclei, quasars, clusters, large-scale structure and the Universe itself. …”
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    Enlace del recurso
  7. 227
    por Tinyakov, P.G., Tkachev, I.I.
    Publicado 2001
    “…We calculate angular correlation function between ultra-high energy cosmic rays (UHECR) observed by Yakutsk and AGASA experiments, and most powerful BL Lacertae objects (quasars with jets directed along the line of sight). …”
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  8. 228
    “…It is known that objects as diverse as young brown dwarfs, planetary nebulae, symbiotic stars, micro-quasars, AGN, and gamma-ray bursters produce jets. …”
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    Enlace del recurso
  9. 229
    por Cox, Arthur
    Publicado 2000
    “…It includes detailed tables of the most recent data on: - General constants and units - Atoms, molecules, and spectra - Observational astronomy at all wavelengths from radio to gamma-rays, and neutrinos - Planetary astronomy: Earth, planets and satellites, and solar system small bodies - The Sun, normal stars, and stars with special characteristics - Stellar populations - Cataclysmic and symbiotic variables, supernovae - Theoretical stellar evolution - Circumstellar and interstellar material - Star clusters, galaxies, quasars, and active galactic nuclei - Clusters and groups of galaxies - Cosmology. …”
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    Enlace del recurso
  10. 230
    por Meier, David L
    Publicado 2012
    “…Black Hole Astrophysics • reviews our current knowledge of cosmic black holes and how they generate the most powerful observed pheonomena in the Universe; • highlights the latest, most up-to-date theories and discoveries in this very active area of astrophysical research; • demonstrates why we believe that black holes are responsible for important phenomena such as quasars, microquasars and gammaray bursts; • explains to the reader the nature of the violent and spectacular outfl ows (winds and jets) generated by black hole accretion.…”
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    Enlace del recurso
  11. 231
    por Barger, Amy
    Publicado 2004
    “…This book provides a unique overview of recent developments in studies of AGN and the evolution of supermassive black holes, with particular emphasis on the revolutionary results from the Chandra and XMM-Newton X-ray Observatories Each chapter is a comprehensive analysis and review by an expert in the field that should provide easy access to the subject The chapters progressively follow a single theme---the mapping of the accretion history of the universe---from both theoretical and observational points of view The chapters are written at a level that should be accessible to graduate students and non-specialists, yet the depth and innovation of the analyses will also make it highly informative to the specialist The topical nature of the subject matter means that the material presented in this book is not well covered in the present literature Moreover, the depth and interconnectedness of the chapters ensures that the coverage is much more comprehensive and informative than a conference proceeding would be The book is intended for astronomers in general, X-ray astronomers, researchers working in the field of quasars and AGN, including graduate students and postdoctoral fellows…”
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    Enlace del recurso
  12. 232
    por Wynn-Williams, Gareth
    Publicado 2016
    “…These surveys led to the discovery of pulsars, quasars, molecular clouds, protostars, bursters, and black holes. …”
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    Enlace del recurso
  13. 233
    “…Tiziana Di Matteo addresses our understanding of black hole formation at cosmic dawn, the emergence of the first quasars, black hole merging and structure formation. …”
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    Enlace del recurso
  14. 234
    por Schutz, B F, Alvarez-Gaumé, Luís
    Publicado 2005
    “…Nature has sprinkled black holes of various sizes throughout the universe, from stellar mass black holes in X-ray sources to supermassive black holes of billions of solar masses in quasars. Astronomers today are probing the spacetime near black holes using X-rays, and gravitational waves will open a different view in the near future. …”
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  15. 235
    “…Blazars are a sub-class of quasars with Doppler boosted jets oriented close to the line of sight, and thus efficient probes of supermassive black hole growth and their environment, especially at high redshifts. …”
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    Online Artículo Texto
  16. 236
    “…Upcoming ultrahigh power lasers at 10 PW level will make it possible to experimentally explore electron-positron (e(−)e(+)) pair cascades and subsequent relativistic e(−)e(+) jets formation, which are supposed to occur in extreme astrophysical environments, such as black holes, pulsars, quasars and gamma-ray bursts. In the latter case it is a long-standing question as to how the relativistic jets are formed and what their temperatures and compositions are. …”
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    Online Artículo Texto
  17. 237
    por D'Onofrio, Mauro, Burigana, Carlo
    Publicado 2009
    “…Do other types of supernovae exist that can be of interest for cosmology? Why have quasars never been effectively used as standard candles? …”
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    Enlace del recurso
  18. 238
    por Verschuur, Gerrit
    Publicado 2015
    “…This is the story of radio astronomy, of how radio waves are generated by stars, supernova, quasars, colliding galaxies and by the very beginnings of the universe itself. …”
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    Enlace del recurso
  19. 239
    por Dar, Arnon, De Rujula, A.
    Publicado 2003
    “…In the CB model the process leading to the ejection of highly relativistic jetted CBs in core-collapse supernova (SN) explosions is akin to the one observed in quasars and microquasars. The prompt $\gamma$-ray emission --the GRB-- is explained extremely well by inverse Compton scattering of light in the near environment of the SN by the electrons in the CBs' plasma. …”
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    Enlace del recurso
  20. 240
    por Balbi, Amedeo, Tombesi, Francesco
    Publicado 2017
    “…During the peak of their accretion phase, supermassive black holes in galactic cores are known to emit very high levels of ionizing radiation, becoming visible over intergalactic distances as quasars or active galactic nuclei (AGN). Here, we quantify the extent to which the activity of the supermassive black hole at the center of the Milky Way, known as Sagittarius A* (Sgr A*), may have affected the habitability of Earth-like planets in our Galaxy. …”
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    Enlace del recurso
    Enlace del recurso
    Online Artículo Texto
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