Infrared images of the Q0957+561 gravitational lens obtained with the Hubble Space Telescope show two large (~5") lensed images of the zs=1.41 quasar host...
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PublicationThe Host Galaxy of the Lensed Quasar Q0957+561
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PublicationThe Hubble Space Telescope Survey of BL Lacertae Objects: Gravitational Lens Candidates and Other Unusual Sources
We present Hubble Space Telescope (HST) observations of seven unusual objects from the HST ``snapshot survey'' of BL Lacertae objects, of which four are...
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PublicationThe Influence of Gravitational Microlensing on the Broad Emission Lines of Quasars
We discuss the effects of microlensing on the broad emission lines (BELs) of QSOs in the light of recent determinations of the size of the broad-line region...
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PublicationThe influence of microlensing on spectral line shapes generated by a relativistic accretion disc
We study the influence of gravitational microlensing on the spectral line profiles originating from a relativistic accretion disc. Using the Chen & Halpern...
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PublicationThe Influence of Microlensing on Time Delay Determinations in Double-imaged Quasars
The lag associated with the main peak of the cross-correlation function of the two light curves arriving from a double-imaged quasar is usually identified with...
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PublicationThe Initial Mass Function of Lens Galaxies from Quasar Microlensing
We present a new approach to studying the initial mass function (IMF) in external galaxies based on quasar microlensing observations. We use measurements of...
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PublicationThe Interstellar Medium in High-redshift Submillimeter Galaxies as Probed by Infrared Spectroscopy*
Submillimeter galaxies (SMGs) at z≳ 1 are luminous in the far-infrared, and have star formation rates, SFR, of hundreds to thousands of solar masses per year...
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PublicationThe intrinsic alignment of red galaxies in DES Y1 redMaPPer galaxy clusters
Clusters of galaxies trace the most non-linear peaks in the cosmic density field. The weak gravitational lensing of background galaxies by clusters can allow us...
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PublicationThe lens SW05 J143454.4+522850: a fossil group at redshift 0.6?
Fossil groups are considered the end product of natural galaxy group evolution in which group members sink towards the centre of the gravitational potential due...