Microlensing results from APO monitoring of the double quasar Q0957+561A,B between 1995 and 1998
| dc.creator | Wambsganss, Joachim | |
| dc.creator | Schmidt, Robert W. | |
| dc.creator | Colley, Wesley N. | |
| dc.creator | Kundic, Tomislav | |
| dc.creator | Turner, Edwin L. | |
| dc.date | 2000-10-12 | |
| dc.date.accessioned | 2026-07-07T01:55:56Z | |
| dc.date.available | 2026-07-07T01:55:56Z | |
| dc.description | 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 10e(-6) Msun and 10e(-2) Msun for quasar sizes of less than 3*10e(14)cm (h = 0.6), hereby extending previous limits upwards by one order of magnitude. | |
| dc.description | A&A Letters, in press (LaTeX, 4 pages, 5 eps figures) | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0010232 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0010232 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/1829 | |
| dc.subject | Astrophysics | |
| dc.title | Microlensing results from APO monitoring of the double quasar Q0957+561A,B between 1995 and 1998 | |
| dc.type | text |