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Investigation of some galactic and extragalactic gravitational phenomena
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| Zeitschriftentitel: | Serbian Astronomical Journal |
|---|---|
| Personen und Körperschaften: | |
| In: | Serbian Astronomical Journal, 2012, 185, S. 1-16 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
National Library of Serbia
|
| Schlagwörter: |
| author_facet |
Jovanovic, P. Jovanovic, P. |
|---|---|
| author |
Jovanovic, P. |
| spellingShingle |
Jovanovic, P. Serbian Astronomical Journal Investigation of some galactic and extragalactic gravitational phenomena Astronomy and Astrophysics |
| author_sort |
jovanovic, p. |
| spelling |
Jovanovic, P. 1450-698X 1820-9289 National Library of Serbia Astronomy and Astrophysics http://dx.doi.org/10.2298/saj1285001j <jats:p>Here we present a short overview of the most important results of our investigations of the following galactic and extragalactic gravitational phenomena: supermassive black holes in centers of galaxies and quasars, supermassive black hole binaries, gravitational lenses and dark matter. For the purpose of these investigations, we developed a model of a relativistic accretion disk around a supermassive black hole, based on the ray-tracing method in the Kerr metric, a model of a bright spot in an accretion disk and three different models of gravitational microlenses. All these models enabled us to study physics, spacetime geometry and effects of strong gravity in the vicinity of supermassive black holes, variability of some active galaxies and quasars, different effects in the lensed quasars with multiple images, as well as the dark matter fraction in the Universe. We also found an observational evidence for the first spectroscopically resolved sub-parsec orbit of a supermassive black hole binary system in the core of active galaxy NGC 4151. Besides, we studied applications of one potential alternative to dark matter in the form of a modified theory of gravity on Galactic scales, to explain the recently observed orbital precession of some S-stars, which are orbiting around a massive black hole at the Galactic center.</jats:p> Investigation of some galactic and extragalactic gravitational phenomena Serbian Astronomical Journal |
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National Library of Serbia, 2012 |
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National Library of Serbia, 2012 |
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1450-698X 1820-9289 |
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Serbian Astronomical Journal |
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49 |
| title |
Investigation of some galactic and extragalactic gravitational phenomena |
| title_unstemmed |
Investigation of some galactic and extragalactic gravitational phenomena |
| title_full |
Investigation of some galactic and extragalactic gravitational phenomena |
| title_fullStr |
Investigation of some galactic and extragalactic gravitational phenomena |
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Investigation of some galactic and extragalactic gravitational phenomena |
| title_short |
Investigation of some galactic and extragalactic gravitational phenomena |
| title_sort |
investigation of some galactic and extragalactic gravitational phenomena |
| topic |
Astronomy and Astrophysics |
| url |
http://dx.doi.org/10.2298/saj1285001j |
| publishDate |
2012 |
| physical |
1-16 |
| description |
<jats:p>Here we present a short overview of the most important results of our
investigations of the following galactic and extragalactic gravitational
phenomena: supermassive black holes in centers of galaxies and quasars,
supermassive black hole binaries, gravitational lenses and dark matter. For
the purpose of these investigations, we developed a model of a relativistic
accretion disk around a supermassive black hole, based on the ray-tracing
method in the Kerr metric, a model of a bright spot in an accretion disk and
three different models of gravitational microlenses. All these models enabled
us to study physics, spacetime geometry and effects of strong gravity in the
vicinity of supermassive black holes, variability of some active galaxies and
quasars, different effects in the lensed quasars with multiple images, as
well as the dark matter fraction in the Universe. We also found an
observational evidence for the first spectroscopically resolved sub-parsec
orbit of a supermassive black hole binary system in the core of active galaxy
NGC 4151. Besides, we studied applications of one potential alternative to
dark matter in the form of a modified theory of gravity on Galactic scales,
to explain the recently observed orbital precession of some S-stars, which
are orbiting around a massive black hole at the Galactic center.</jats:p> |
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| container_title | Serbian Astronomical Journal |
| description | <jats:p>Here we present a short overview of the most important results of our investigations of the following galactic and extragalactic gravitational phenomena: supermassive black holes in centers of galaxies and quasars, supermassive black hole binaries, gravitational lenses and dark matter. For the purpose of these investigations, we developed a model of a relativistic accretion disk around a supermassive black hole, based on the ray-tracing method in the Kerr metric, a model of a bright spot in an accretion disk and three different models of gravitational microlenses. All these models enabled us to study physics, spacetime geometry and effects of strong gravity in the vicinity of supermassive black holes, variability of some active galaxies and quasars, different effects in the lensed quasars with multiple images, as well as the dark matter fraction in the Universe. We also found an observational evidence for the first spectroscopically resolved sub-parsec orbit of a supermassive black hole binary system in the core of active galaxy NGC 4151. Besides, we studied applications of one potential alternative to dark matter in the form of a modified theory of gravity on Galactic scales, to explain the recently observed orbital precession of some S-stars, which are orbiting around a massive black hole at the Galactic center.</jats:p> |
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| spelling | Jovanovic, P. 1450-698X 1820-9289 National Library of Serbia Astronomy and Astrophysics http://dx.doi.org/10.2298/saj1285001j <jats:p>Here we present a short overview of the most important results of our investigations of the following galactic and extragalactic gravitational phenomena: supermassive black holes in centers of galaxies and quasars, supermassive black hole binaries, gravitational lenses and dark matter. For the purpose of these investigations, we developed a model of a relativistic accretion disk around a supermassive black hole, based on the ray-tracing method in the Kerr metric, a model of a bright spot in an accretion disk and three different models of gravitational microlenses. All these models enabled us to study physics, spacetime geometry and effects of strong gravity in the vicinity of supermassive black holes, variability of some active galaxies and quasars, different effects in the lensed quasars with multiple images, as well as the dark matter fraction in the Universe. We also found an observational evidence for the first spectroscopically resolved sub-parsec orbit of a supermassive black hole binary system in the core of active galaxy NGC 4151. Besides, we studied applications of one potential alternative to dark matter in the form of a modified theory of gravity on Galactic scales, to explain the recently observed orbital precession of some S-stars, which are orbiting around a massive black hole at the Galactic center.</jats:p> Investigation of some galactic and extragalactic gravitational phenomena Serbian Astronomical Journal |
| spellingShingle | Jovanovic, P., Serbian Astronomical Journal, Investigation of some galactic and extragalactic gravitational phenomena, Astronomy and Astrophysics |
| title | Investigation of some galactic and extragalactic gravitational phenomena |
| title_full | Investigation of some galactic and extragalactic gravitational phenomena |
| title_fullStr | Investigation of some galactic and extragalactic gravitational phenomena |
| title_full_unstemmed | Investigation of some galactic and extragalactic gravitational phenomena |
| title_short | Investigation of some galactic and extragalactic gravitational phenomena |
| title_sort | investigation of some galactic and extragalactic gravitational phenomena |
| title_unstemmed | Investigation of some galactic and extragalactic gravitational phenomena |
| topic | Astronomy and Astrophysics |
| url | http://dx.doi.org/10.2298/saj1285001j |