Publication
Long-term variability of quasi-stellar objects, and their distribution in the Hubble diagram.
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PublicationLow deuterium abundance in the z_abs=3.514 absorber towards APM 08279+5255{A high-resolution, high signal-to-noise HIRES-Keck spectrum of APM 08279+5255 reveals a feature in the HI Lyalpha profile of the z_abs=3.514 absorber at the...
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PublicationLow-redshift quasars in the SDSS Stripe 82 - II. Associated companion galaxies and signature of star formationWe present optical spectroscopy of the close companions of 22 low-redshift (z < 0.5) quasars (QSO) selected from a larger sample of QSO in the SDSS Stripe82...
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PublicationLow-resolution spectroscopy and spectral energy distributions of selected sources towards σ OrionisAims: We study in detail nine sources in the direction of the young σ Orionis cluster, which is considered to be a unique site for studying stellar and...
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NewsLST-1 telescope on La Palma detects the most distant quasar at very high energiesThe first Large-Sized Telescope (LST) prototype of the Cherenkov Telescope Array Observatory (CTAO), located at the Roque de los Muchachos Observatory (Garafía...
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PublicationLuminosity functions for galaxies and quasars in the Spitzer Wide-area Infrared Extragalactic Legacy SurveyWe construct rest-frame luminosity functions (LFs) at 3.6, 4.5, 5.8, 8 and 24 μm over the redshift range 0 z 2 for galaxies and 0 z 4 for optical quasi...
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PublicationMAGIC detection of sub-TEV emission from gravitationally lensed blazar QSO B0218+357The blazar QSO B0218+357 is the first gravitationally lensed blazar detected in the very high energy (VHE, E > 100 GeV) gamma-ray spectral range (Ahnen et al...
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PublicationMAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21Very high energy (VHE) γ-ray emission from the flat spectrum radio quasar (FSRQ) PKS 1222+21 (4C 21.35, z = 0.432) was detected with the MAGIC Cherenkov...
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PublicationMAGIC gamma-ray and multi-frequency observations of flat spectrum radio quasar PKS 1510-089 in early 2012Aims: Amongst more than fifty blazars detected in very high energy (VHE, E> 100 GeV) γ rays, only three belong to the subclass of flat spectrum radio quasars...