Nuclei Of Galaxies
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Polarización de la luz: conceptos básicos y aplicaciones en astrofísica
Abstract The astrophysics allows to understand applications about physical laws and it constitutes a powerful, didactic tool for the teaching. Concepts of the electromagnetism, such as the polarization of the light let us study different astronomical objects, such as stars, planets and galaxies. This work shows an historical revision about the polarization,
Rev. Bras. Ensino Fís.. Publicado em: 02/08/2018
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2. Formação e evolução de galáxias: populações estelares na Via Láctea, galáxias elípticas e propriedades de galáxias em grupos / Galaxy Formation and Evolution: From the Milky Way to Galaxies in Groups
Understanding the way galaxies form and evolve throughout the cosmic time remains one of the greatest challenges of modern cosmology. Several processes are known to play a role in the formation of galaxies, such as feedback from supernovae and active galactic nuclei, chemical and dynamical evolution and environmental effects. This thesis encompasses these pr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/03/2012
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3. Feeding the monster
Publicado em: 2011
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4. Influence of the black hole rotation on accretion discs and jets in active galaxies: the case of NGC 1068
Although we do not observe directly black holes in the Universe, their presence has been inferred in several astrophysical systems, from galactic to extragalactic scales. In this work, we will restrict our focus in the possible signatures of the presence of Kerr black holes in active galactic nuclei, one of the most powerful sources in the Universe. Particul
Brazilian Journal of Physics. Publicado em: 2005-12
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5. Relativistic jets and accretion phenomena associated with galactic and extragalactic black holes
More than a dozen binary star systems hosting stellar-mass black holes have been discovered in our galaxy. Some of them eject collimated relativistic jets with apparent velocities larger than the light speed. These objects have been named microquasars thanks to their similarity with the distant quasars or active nuclei of galaxies that host supermassive blac
Brazilian Journal of Physics. Publicado em: 2005-12
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6. Optical spectroscopy of obscured active galaxies / Espectroscopia óptica de galáxias ativas obscurecidas
We present in this work a study of obscured Active Galaxies which were identified by Sofia Kirhakos in 1990. She verified that surveys at the optical part of the spectrum are not efficient to identify Seyfert nuclei in galaxies observed edge-on. To overcome this difficulty she proposed a selection criterion in which sources identified by the IRAS satellite t
Publicado em: 1998
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7. Optical evidence for the unification of active galactic nuclei and quasi-stellar objects.
There is a variety of optical evidence for some unification of different types of active galactic nuclei and quasi-stellar objects (QSOs). The case is very strong for the unification of at least some Seyfert galaxies, where polarization data show that the type assigned to the Seyfert galaxy must depend on viewing direction. It has been proposed that Fanaroff
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8. Observational model of the ionized gas in Seyfert and radio-galaxy nuclei*
Equivalent widths of the total emission-line Hβ in Seyfert 1, Seyfert 2, and intermediate-type Seyfert galaxies, expressed in terms of the featureless continuum, all have approximately the same frequency distribution. This suggests that the energy-input mechanism to both the narrow-line, low-density gas and the broad-line, high-density gas is photoionizatio
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9. Probing active galactic nuclei with H2O megamasers.
We describe the characteristics of the rapidly rotating molecular disk in the nucleus of the mildly active galaxy NGC4258. The morphology and kinematics of the disk are delineated by the point-like watervapor emission sources at 1.35-cm wavelength. High angular resolution [200 microas where as is arcsec, corresponding to 0.006 parsec (pc) at 6.4 million pc]