358 citations · 2.2k across the 82 of their papers we have counts for
17 papers · 1 filter
Near- and mid-infrared photometry of high-redshift 3CR sources
M. Haas, S. V. P. Willner, F. Heymann +5
Using the Spitzer Space Telescope, we have obtained 3.6--24 micron photometry of 38 radio galaxies and 24 quasars from the 3CR catalog at redshift 1<z<2.5. This 178 MHz-selected sa…
A near-infrared survey of the entire R Corona Australis cloud
M. Haas, F. Heymann, I. Domke +3
To understand low- to intermediate-mass star-formation in the nearby R CrA molecular cloud, we try to identify the stellar content that is accessible with near-infrared observation…
Probing the centre of the large circumstellar disc in M17
M. Nielbock, R. Chini, V. H. Hoffmeister +3
We investigated the nature of the hitherto unresolved elliptical infrared emission in the centre of the ~20000 AU disc silhouette in M 17. We combined high-resolution JHKsL'M' band…
The reddest ISO-2MASS quasar
C. Leipski, M. Haas, R. Siebenmorgen +9
In the course of the NIR/MIR AGN search combining the 6.7 mu ISOCAM Parallel Survey and 2MASS we have discovered 24 type-1 quasars about a third of which are too red to be discrimi…
VISIR/VLT mid-infrared imaging of Seyfert nuclei: Nuclear dust emission and the Seyfert-2 dichotomy
Martin Haas, Ralf Siebenmorgen, Eric Pantin +5
Half of the Seyfert-2 galaxies escaped detection of broad lines in their polarised spectra observed so far. Some authors have suspected that these non-HBLRs contain real Sy2 nuclei…
Narrow-line AGN in the ISO-2MASS Survey
C. Leipski, M. Haas, H. Meusinger +9
Context: A long-standing challenge of observational AGN research is to find type 2 quasars, the luminous analogues of Seyfert-2 galaxies. Aims: We search for luminous narrow-line t…