TY  - JOUR
A1  - Wambsganß, Joachim
A1  - Schmidt, Robert W.
A1  - Colley, W.
A1  - Kundic, T.
A1  - Turner, E. L.
T1  - Microlensing results from APO monitoring of the double quasar Q0957+561A,B between 1995 and 1998
N2  - If the halo of the lensing galaxy 0957+561 is made of massive compact objects (MACHOs), they must affect the lightcurves of the quasar images Q0957+561 A and B differently. We search for this microlensing effect in the double quasar by comparing monitoring data for the two images A and B - obtained with the 3.5m Apache Point Observatory from 1995 to 1998 - with intensive numerical simulations. This way we test whether the halo of the lensing galaxy can be made of MACHOs of various masses. We can exclude a halo entirely made out of MACHOs with masses between 10-6 Msun and 10-2 Msun for quasar sizes of less than 3x 1014 h60-1/2 cm, hereby extending previous limits upwards by one order of magnitude.
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Wambsganß, Joachim
A1  - Hasinger, Günther
A1  - Giacconi, R.
A1  - Gunn, J. E.
A1  - Lehmann, Ingo
A1  - Schmidt, M.
A1  - Schneider, D. P.
A1  - Stanke, Thomas
A1  - Trümper, J.
A1  - Woods, D.
A1  - Zamorani, G.
T1  - A Distant X-ray Selected, Gravitationally-Lensing Galaxy Cluster
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Koopmans, L. V. E.
A1  - de Bruyn, A. G.
A1  - Wambsganß, Joachim
T1  - Radio Microlensing and dark-matter in high-z galaxies
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Lehmann, Ingo
A1  - Hasinger, Günther
A1  - Giacconi, R.
A1  - Gunn, J. E.
A1  - Schmidt, M.
A1  - Schneider, D. P.
A1  - Stanke, Thomas
A1  - Trümper, J.
A1  - Wambsganß, Joachim
A1  - Woods, D.
A1  - Zamorani, G.
T1  - One of the highest redshift X-Ray selected clusters of galaxies
Y1  - 2000
SN  - 3-540-67163-3
ER  -