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Old Q0957+561 data & software: 

Optical Monitoring

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Simple FORTRAN programs to apply the d2 test (accurate and robust time delay measurements)

 

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Workshop 2004

 

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GLENDAMA results


We 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 1030 years, since observations on 1030 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

System (No. images) R.A. (J2000) Dec. (J2000) Size () Image magnitude
PS J0147+4630 (4)        
SBS 0909+532 (2)   09 13 01.05    +52 59 28.8 1.1 r = 1617
FBQ 0951+2635 (2) 09 51 22.57 +26 35 14.1 1.1 r = 1718.5
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 = 1818.5
SDSS J1339+1310 (2) 13 39 07.14 +13 10 39.6 1.7 r = 1819
HE 1413+117 (4) 14 15 46.40 +11 29 41.4 1.4 r = 1818.5
SDSS J1442+4055 (2) 14 42 54.78 +40 55 35.6 2.1 r = 1819
SDSS J1515+1511 (2) 15 15 38.59 +15 11 35.8 2.0 r = 1819
QSO 2237+0305 (4) 22 40 30.34 +03 21 28.8 1.8 r = 16.518.5

 

System

zlens (method)

Delays in days

Reverberation  delays in days

Detection of microlensing? (method)

Constraints on source/lens

q0147          
q0909 DI 0.83 (spec/abs) 50+2-4 (r band)   yes (var)

source nature & size

q0951       yes (var)  
q0957 ~ 0.36 (spec/ext) 416.51.0 (g band)

420.61.9 (r band)

31 (B/gU bands)

41 (B/gr bands)

~ 9 (B/gi bands)

~ 14 (B/gz bands)

~ 32 (B/X rayuvis)

yes (var)

source nature & size lens structure

q1001          
q1339 0.6090.001  (spec lens) [updated] 47+5-6 (r band)   yes (spec & var) [updated]

source & lens structure [more on source structure]

q1413 1.88+0.09-0.11 (delays) 173 (AB, r band)

204 (AC, r band)

234 (AD, r band)

    lens structure
q1442 DI 0.284 (spec lens) 25 (r band)     lens structure
q1515 0.742 (spec/abs + delay) 2115 (r band)   yes (spec) source & lens structure
q2237       yes (var) source nature & size

 

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)