We study the physical and kinematic properties of the narrow-line region (NLR) of the nearest obscured quasar MRK 477 (z = 0.037), using optical and near...
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PublicationDeconstructing the narrow-line region of the nearest obscured quasar
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PublicationDetecting microvariability in type 2 quasars using enhanced F-test
Microvariability (intranight variability) is a low amplitude flux change at short time-scales (i.e. hours). It has been detected in unobscured type 1 active...
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PublicationDetection of an intranight optical hard lag with colour variability in blazar PKS 0735+178
Blazars are a highly variable subclass of active galactic nuclei that have been observed to vary significantly during a single night. This intranight...
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PublicationDetection of Chromatic Microlensing in Q 2237 + 0305 A
We present narrowband images of the gravitational lens system Q 2237 + 0305 made with the Nordic Optical Telescope in eight different filters covering the...
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PublicationDetection of persistent VHE gamma-ray emission from PKS 1510-089 by the MAGIC telescopes during low states between 2012 and 2017
Context. PKS 1510-089 is a flat spectrum radio quasar strongly variable in the optical and GeV range. To date, very high-energy (VHE, > 100 GeV) emission has...
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PublicationDetection of the 2175 Å Extinction Feature at z = 0.83
We determine the extinction curve in the zl=0.83 lens galaxy of the gravitational lens SBS 0909+532 from the wavelength dependence of the flux ratio between the...
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PublicationDetection of very high energy gamma-ray emission from the gravitationally lensed blazar QSO B0218+357 with the MAGIC telescopes
Context. QSO B0218+357 is a gravitationally lensed blazar located at a redshift of 0.944. The gravitational lensing splits the emitted radiation into two...
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PublicationDetermination of the properties of the central engine in microlensed QSOs
We study a recently observed gravitational microlensing peak in the V-band light curve of Q2237+0305A using a relatively simple physical model, but one that is...
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PublicationDetermining the fraction of reddened quasars in COSMOS with multiple selection techniques from X-ray to radio wavelengths
The sub-population of quasars reddened by intrinsic or intervening clouds of dust are known to be underrepresented in optical quasar surveys. By defining a...