588 citations · 4k across the 77 of their papers we have counts for
6 papers · 1 filter
On the relation of optical obscuration and X-ray absorption in Seyfert galaxies
L. Burtscher, R. I. Davies, J. Gracia-Carpio +15
The optical classification of a Seyfert galaxy and whether it is considered X-ray absorbed are often used interchangeably. But there are many borderline cases and also numerous exa…
A deep Herschel/PACS observation of CO(40-39) in NGC 1068: a search for the molecular torus
A. W. Janssen, S. Bruderer, E. Sturm +14
Emission from high-J CO lines in galaxies has long been proposed as a tracer of X-ray dominated regions (XDRs) produced by AGN. Of particular interest is the question of whether th…
Insights on the Dusty Torus and Neutral Torus from Optical and X-ray Obscuration in a Complete Volume Limited Hard X-ray AGN Sample
R. Davies, L. Burtscher, D. Rosario +21
We describe a complete volume limited sample of nearby active galaxies selected by their 14-195keV luminosity, and outline its rationale for studying the mechanisms regulating gas…
GRAVITY: the VLTI 4-beam combiner for narrow-angle astrometry and interferometric imaging
N. Blind, F. Eisenhauer, S. Gillessen +23
GRAVITY is the second generation Very Large Telescope Interferometer instrument for precision narrow-angle astrometry and interferometric imaging in the Near Infra-Red (NIR). It sh…
The GRAVITY instrument software / High-level software
Leonard Burtscher, Ekkehard Wieprecht, Thomas Ott +30
GRAVITY is the four-beam, near- infrared, AO-assisted, fringe tracking, astrometric and imaging instrument for the Very Large Telescope Interferometer (VLTI). It is requiring the d…
The GRAVITY metrology system: narrow-angle astrometry via phase-shifting interferometry
M. Lippa, N. Blind, S. Gillessen +26
The VLTI instrument GRAVITY will provide very powerful astrometry by combining the light from four telescopes for two objects simultaneously. It will measure the angular separation…