0000000000376879

AUTHOR

Luka Č. Popović

showing 3 related works from this author

The Detailed Science Case for the Maunakea Spectroscopic Explorer, 2019 edition

2019

(Abridged) The Maunakea Spectroscopic Explorer (MSE) is an end-to-end science platform for the design, execution and scientific exploitation of spectroscopic surveys. It will unveil the composition and dynamics of the faint Universe and impact nearly every field of astrophysics across all spatial scales, from individual stars to the largest scale structures in the Universe. Major pillars in the science program for MSE include (i) the ultimate Gaia follow-up facility for understanding the chemistry and dynamics of the distant Milky Way, including the outer disk and faint stellar halo at high spectral resolution (ii) galaxy formation and evolution at cosmic noon, via the type of revolutionary…

[PHYS]Physics [physics]Cosmology and Nongalactic Astrophysics (astro-ph.CO)Astrophysics::Instrumentation and Methods for AstrophysicsFOS: Physical sciencesAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics - Astrophysics of Galaxies[PHYS] Physics [physics][SDU] Sciences of the Universe [physics][SDU]Sciences of the Universe [physics]Astrophysics of Galaxies (astro-ph.GA)Astrophysics::Earth and Planetary AstrophysicsAstrophysics - Instrumentation and Methods for AstrophysicsInstrumentation and Methods for Astrophysics (astro-ph.IM)Astrophysics::Galaxy AstrophysicsAstrophysics - Cosmology and Nongalactic Astrophysics
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A Study of the Correlation between the Amplification of the Fe Kα Line and the X‐Ray Continuum of Quasars due to Microlensing

2006

The observed enhancement of the Fe Kα line in three gravitationally lensed QSOs (MG J0414+0534, QSO 2237+0305, and H1413+117) is interpreted in terms of microlensing, even when equivalent X-ray continuum amplification is not observed. In order to interpret these observations, first we studied the effects of microlensing on quasar spectra produced by a straight fold caustic crossing over a standard relativistic accretion disk. The disk emission was analyzed using the ray-tracing method, considering Schwarzschild and Kerr metrics. When the emission is separated into two regions (an inner disk corresponding to the Fe Kα line and an outer annulus corresponding to the continuum, or vice versa), …

PhysicsQSOSActive galactic nucleusAstrophysics::High Energy Astrophysical PhenomenaContinuum (design consultancy)AstronomyAstronomy and AstrophysicsQuasarAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsGravitational microlensingSpectral lineGravitational lensSpace and Planetary ScienceAstrophysics::Earth and Planetary AstrophysicsAstrophysics::Galaxy AstrophysicsLine (formation)The Astrophysical Journal
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RXJ 0921+4529: a binary quasar or gravitational lens?

2010

We report the new spectroscopic observations of the gravitational lens RXJ 021+4529 with the multi-mode focal reducer SCORPIO of the SAO RAS 6-m telescope. The new spectral observations were compared with the previously observed spectra of components A and B of RXJ 0921+4529, i.e. the same components observed in different epochs. We found a significant difference in the spectrum between the components that cannot be explained with microlensing and/or spectral variation. We conclude that RXJ 0921+4529 is a binary quasar system, where redshifts of quasars A and B are 1.6535 +/- 0.0005 and 1.6625 +/- 0.0015, respectively.

PhysicsActive galactic nucleusCosmology and Nongalactic Astrophysics (astro-ph.CO)FOS: Physical sciencesAstronomy and AstrophysicsQuasarAstrophysicsGravitational microlensingGalaxySpectral lineRedshiftGravitational lensSpace and Planetary ScienceEmission spectrumAstrophysics - Cosmology and Nongalactic Astrophysics
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