Results 31 to 40 of about 344,061 (314)
SPECTRAL AND PHOTOMETRIC STUDIES OF MRK6 AND MRK1040 IN THE OPTICAL RANGE
Eurasian Physical Technical JournalThis paper is dedicated to the study of variability in active galactic nuclei, which play a key role in understanding the physical processes occurring in their central regions.
S.A. Shomshekova +5 more
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Open Astronomy, 2012 AG Dra is a classical symbiotic star that undergoes major outbursts at intervals between 12-15 years. We present spectroscopic observations of four emission lines (Hα, Hβ, He II 4686 Å, Raman scattered OVI 6825 Å) before, during and after the major ...
Leedjärv L., Burmeister M.
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Frontiers in Astronomy and Space Sciences, 2018 Here we investigate the connection of broad emission line shapes and continuum light curve variability time scales of type-1 Active Galactic Nuclei (AGN).
Edi Bon +4 more
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Spectral and Photometric Studies of NGC 7469 in the Optical Range
UniverseThe galaxy NGC 7469 is a bright infrared source with an active galactic nucleus (AGN) and an intense star-forming region with a radius of approximately 500 parsecs, where the star formation rate is estimated to be 20–50 M⊙yr−1.
Saule Shomshekova +5 more
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Hints on the Broad Line Region Structure of Quasars at High and Low Luminosities
Open Astronomy, 2011 Quasars show a considerable spectroscopic diversity. However, the variety of quasar spectra at low redshifts is non-random: a principal component analysis applied to large samples customarily identifies two main eigenvectors. In this contribution we show
Marziani Paola +4 more
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Self-Consistent Dynamical Model of the Broad Line Region
Frontiers in Astronomy and Space Sciences, 2017 We develop a self-consistent description of the Broad Line Region based on the concept of a failed wind powered by radiation pressure acting on a dusty accretion disk atmosphere in Keplerian motion. The material raised high above the disk is illuminated,
Bozena Czerny +7 more
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Interpreting broad emission-line variations – I. Factors influencing the emission-line response [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 21 pages, 17 figures, accepted for publication in MNRAS July ...
Goad, Michael R., Korista, K. T.
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[89Zr]Oxinate4 for long-term in vivo cell tracking by positron emission tomography [PDF]
, 2014 Purpose 111In (typically as [111In]oxinate3) is a gold standard radiolabel for cell tracking in humans by scintigraphy. A long half-life positron-emitting radiolabel to serve the same purpose using positron emission tomography (PET) has long been ...
Meszaros, L.K. +26 more
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Investigation of the Nature of the B[e] Star CI Cam in the Optical Range
GalaxiesThe B[e] phenomenon is observed in a wide range of stars at various evolutionary stages. Its nature remains uncertain. The B[e] phenomenon is defined as the simultaneous presence of low-excitation forbidden line emission and strong infrared excess in the
Elena A. Barsukova +3 more
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High Redshift Quasars, Emission Lines and ‘Cloudy’
Open Astronomy, 2011 I describe some of the outstanding “big picture” questions in quasar research and how the development of the plasma simulation code Cloudy is being guided to answer them.
Ferland Gary J.
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