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.
| Author details: | Joachim Wambsganß, Robert W. Schmidt, W. Colley, T. Kundic, E. L. Turner |
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| Publication type: | Article |
| Language: | English |
| Year of first publication: | 2000 |
| Publication year: | 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 the publication: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik |
