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Microlensing results from APO monitoring of the double quasar Q0957+561A,B between 1995 and 1998

  • 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.

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Metadaten
Author:Joachim Wambsganß, Robert W. Schmidt, W. Colley, T. Kundic, E. L. Turner
Document Type:Article
Language:English
Year of first Publication:2000
Year of Completion:2000
Release Date:2017/03/24
Source:Astronomy and Astrophysics. - 362 (2000), 3, L37 - L40
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Institution name at the time of publication:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik