6 papers · 1 filter
A 1200 micron MAMBO Survey of the ELAIS N2 and Lockman Hole East Fields
T. R. Greve, R. J. Ivison, F. Bertoldi +4
Using the MPIfR Max Planck Millimeter Bolometer array (MAMBO) on the IRAM 30m Telescope we have mapped the ELAIS N2 and Lockman Hole East Fields at 1200 micron to a rms noise level…
Using VLBI Data to Investigate the Galaxy Structure in the Gravitationally Lensed System B1422+231
M. Bradac, P. Schneider, M. Steinmetz +3
Gravitationally lensed systems with multiply imaged quasars are an excellent tool for studying the properties of distant galaxies. In particular, they provide the most accurate mas…
A GPS-based method to model the plasma effects in VLBI observations
E. Ros, J. M. Marcaide, J. C. Guirado +2
Global Positioning System (GPS) satellites broadcast at frequencies of 1,575.42 MHz (L1) and of 1,227.60 MHz (L2). The dispersive property of the ionosphere can be used to combine…
Everything you ever wanted to know about the JVAS gravitational lens system B1030+074 but were afraid to ask
E. Xanthopoulos, I. W. A. Browne, P. N. Wilkinson +6
We present an overview of all the observations (radio - VLA, MERLIN, VLBA,EVN - and optical - WFPC2 and NICMOS -) that were initially used to confirm the gravitational lens nature…
Advection-dominated Accretion in the Galactic Center and the Appearance of Sgr A*
T. Beckert, W. J. Duschl
We present a modified description of advection-dominated accretion flows (ADAF) with a geometrical viscosity. A simplified treatment of the dynamics of the flow in the inner relati…
ROSAT PSPC X-ray observations of the nearby spiral galaxy M83
M. Ehle, W. Pietsch, R. Beck +1
The nearly face-on SBc galaxy M83 (NGC 5236) was observed for 25 ksec with the ROSAT PSPC. We detected 13 point-like sources in this galaxy, 10 of which were previously unknown. We…