Old Q0957+561 data & software:
► Simple FORTRAN programs to apply the d2 test (accurate and robust time delay measurements)
► Photos
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GLENDAMA results |
W
e are conducting follow-up observations of a small sample of 10 lensed quasars with images brighter than r = 20 mag and visible from the Northern Hemisphere (see table below; click on each systems to find main results). We are using the robotic 2m Liverpool Telescope (LT), the GTC and other facilities. A second table summarizes our contribution to the study of this sample. Next to the acronym in boldface for some system, we show 'DI' when the GLENDAMA team participated in its discovery/identification. In addition, entries in black (without links) mean that the results are firm but are not yet published in scientific journals. We want to perform a detailed follow-up of each target over 10–30 years, since observations on 10–30 year timescales are crucial to characterize intrinsic variabilities, measure extremely accurate time delays and detect significant microlensing effects in practically all objects in this final GLENDAMA sample. A third table incorporates other interesting dual AGN systems that were discovered/identified by us and our collaborators
| System (No. images) | R.A. (J2000) | Dec. (J2000) | Size (²) | Image magnitude |
| PS J0147+4630 (4) | 01 47 10.22 | +46 30 43.7 | 3.4 | r = 16–18 |
| SBS 0909+532 (2) | 09 13 01.05 | +52 59 28.8 | 1.1 | r = 16–17 |
| FBQ 0951+2635 (2) | 09 51 22.57 | +26 35 14.1 | 1.1 | r = 17–18.5 |
| QSO 0957+561 (2) | 10 01 20.78 | +55 53 49.4 | 6.1 | r = 17 |
| SDSS J1001+5027 (2) | 10 01 28.61 | +50 27 56.9 | 2.9 | r = 18–18.5 |
| SDSS J1339+1310 (2) | 13 39 07.14 | +13 10 39.6 | 1.7 | r = 18–19 |
| HE 1413+117 (4) | 14 15 46.40 | +11 29 41.4 | 1.4 | r = 18–18.5 |
| SDSS J1442+4055 (2) | 14 42 54.78 | +40 55 35.6 | 2.1 | r = 18–19 |
| SDSS J1515+1511 (2) | 15 15 38.59 | +15 11 35.8 | 2.0 | r = 18–19 |
| QSO 2237+0305 (4) | 22 40 30.34 | +03 21 28.8 | 1.8 | r = 16.5–18.5 |
| System |
zlens (method) |
Delays in days |
Reverberation delays in days |
Detection of microlensing? (method) |
Constraints on source/lens |
| q0147 | 0.678±0.001 (spec lens) | 2.6+1.1–3.2 (AB, r band) | yes (var) | ||
| q0909 DI | 0.83 (spec/abs) | 50+2–4 (r band) | yes (var) [updated] | ||
| q0951 | yes (var) [updated] | ||||
| q0957 | ~ 0.36 (spec/ext) | 416.5±1.0 (g band) | yes (var) | ||
| q1001 | |||||
| q1339 | 0.609±0.001 (spec lens) [updated] | 47+5–6 (r band) | yes (spec & var) [updated] | ||
| q1413 | 1.88+0.09-0.11 (delays) | 17±3 (AB, r band) | yes (var) | lens structure | |
| q1442 DI | 0.284±0.001 (spec lens) | 25.0±1.5 (r band) | yes (var) | lens structure [updated] | |
| q1515 | 0.742 (spec/abs + delay) | 211±5 (r band) | yes (spec) | source & lens structure | |
| q2237 | yes (var) [updated] | source nature & size |
| System | RA in deg | Dec in deg | Size (²) | Details |
| SDSS J1617+3827 |
244.47052
|
+38.46030 | 2.1 |
Double quasar at z = 2.079 (r ~ 19-21) - Detection of a candidate for the main deflector - Secondary lensing galaxy at z = 0.602 - MgII absorbers at z = 0.602 & 0.866 - Papers I and II (see also III) |
| SDSS J1642+3200 | 250.71282 | +32.00811 | 2.9 |
Quasar at z = 2.263 (r ~ 18) and AGN at z = 0.2765 (r > 20) showing variability, a flat continuum and narrow emission lines (optical) - Papers I, II and IV |
| SDSS J2153+2732 | 328.31784 | +27.54302 | 3.6 |
Two distinct but physically associated quasars at z ~ 2.24 (r ~ 19-20) - Evidence of a collision/merger within a galaxy cluster at an early stage (... binary quasar?) - Papers I and II |
| SDSS J0240–0208 | 40.07669 | –2.14730 | 1.0 |
Pair of quasars at z = 1.687 & z = 1.059 - Paper II |
► See also
Robotic Monitoring of Gravitationally Lensed Quasars (Adv. in Astron.)
The Mechanism of Intrinsic Variability in Bright Gravitationally Lensed Quasars at 1 < z < 2 (Open Astron. J.)
Time-domain studies of gravitationally lensed quasars (GLQs)
(Proc. IAUS)An efficient way to find monsters with two faces (OUPblog)