Related papers: Interpretation of the OGLE Q2237+0305 microlensing…

Caustic Crossing in the Gravitational Lens Q2237+0305

The monitoring of the gravitational lens Q2237+0305 carried out by the OGLE group during 1997--1999 is analyzed. The significant light amplifications in the C and A quasar components with maxima in mid- and late 1999, respectively, are…

Astrophysics · Physics 2009-11-06 V. N. Shalyapin

The Optical Gravitational Lensing Experiment. A Hunt for Caustic Crossings in QSO 2237+0305

In 1998 The Optical Gravitational Lensing Experiment (OGLE) successfully implemented automated data reductions for QSO 2237+0305. Using a new image subtraction method we achieved a differential photometry scatter of 1-5 % for images A-D…

Astrophysics · Physics 2009-10-31 P. R. Wozniak , A. Udalski , M. Szymanski , M. Kubiak , G. Pietrzynski , I. Soszynski , K. Zebrun , .

Predicting caustic crossing high magnification events in Q2237+0305

The central regions of the gravitationally lensed quasar Q2237+0305 can be indirectly resolved on nano-arcsecond scales if viewed spectrophotometricly during a microlensing high magnification event (HME). Q2237+0305 is currently being…

Astrophysics · Physics 2009-10-31 J. S. B. Wyithe , E. L. Turner , R. L. Webster , E. Agol

Optical monitoring of the gravitationally lensed quasar Q2237+0305 from APO between June 1995 and January 1998

We present a data set of images of the gravitationally lensed quasar Q2237+0305, that was obtained at the Apache Point Observatory (APO) between June 1995 and January 1998. Although the images were taken under variable, often poor seeing…

Astrophysics · Physics 2008-11-26 R. W. Schmidt , T. Kundic , U. -L. Pen , E. L. Turner , J. Wambsganss , L. E. Bergeron , W. N. Colley , C. Corson , N. C. Hastings , T. Hoyes , D. C. Long , K. A. Loomis , S. Malhotra , J. E. Rhoads , K. Z. Stanek

Is there a caustic crossing in the lensed quasar Q2237+0305 observational data record?

We re-investigate the gravitationally lensed system Q2237+0305 data record to quantify the probability of having a caustic crossing in the A component. Several works assume that this is the case, but no quantitative analysis is available in…

Astrophysics · Physics 2009-11-11 R. Gil-Merino , J. Gonzalez-Cadelo , L. J. Goicoechea , V. N. Shalyapin , G. F. Lewis

The multiple quasar Q2237+0305 under a microlensing caustic

We use the high magnification event seen in the 1999 OGLE campaign light curve of image C of the quadruply imaged gravitational lens Q2237+0305 to study the structure of the quasar engine. We have obtained g'- and r'-band photometry at the…

Astrophysics · Physics 2009-11-13 T. Anguita , R. W. Schmidt , E. L. Turner , J. Wambsganss , R. L. Webster , K. A. Loomis , D. Long , R. McMillan

The rate of caustic crossing microlensing events for Q2237+0305

Spectrophotometric observation of the gravitationally microlensed quasar Q2237+0305 during a High Magnification Event (HME) is potentially a very powerful tool for probing the structure of the quasars accretion disc on scales of less than…

Astrophysics · Physics 2016-08-30 J. S. B. Wyithe , R. L. Webster , E. L. Turner

Statistics of Microlensing Caustic Crossings in Q~2237+0305: Peculiar Velocity of the Lens Galaxy and Accretion Disk Size

We use the statistics of caustic crossings induced by microlensing in the lens system Q~2237+0305 to study the lens galaxy peculiar velocity. We calculate the caustic crossing rates for a comprehensive family of stellar mass functions and…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-23 E. Mediavilla , J. Jimenez-Vicente , J. A. Muñoz , T. Mediavilla , O. Ariza

Simulating quasar microlensing light curves: High magnification events

Quasar microlensing can be used to constrain important astrophysical properties, such as the accretion disk size and the amount of stars in the lensing galaxy. The associated brightness variations over time, in particular high magnification…

Astrophysics of Galaxies · Physics 2025-09-09 Favio Neira , Timo Anguita , Georgios Vernardos

OGLE-2016-BLG-1003: First Resolved Caustic-crossing Binary-source Event Discovered by Second-generation Microlensing Surveys

We report the analysis of the first resolved caustic-crossing binary-source microlensing event OGLE-2016-BLG-1003. The event is densely covered by the round-the-clock observations of three surveys. The light curve is characterized by two…

Solar and Stellar Astrophysics · Physics 2017-05-31 Y. K. Jung , A. Udalski , I. A. Bond , J. C. Yee , A. Gould , C. Han , M. D. Albrow , C. -U. Lee , S. -L. Kim , K. -H. Hwang , S. -J. Chung , Y. -H. Ryu , I. -G. Shin , W. Zhu , S. -M. Cha , D. -J. Kim , Y. Lee , B. -G. Park , R. W. Pogge , J. Skowron , M. K. Szymanski , R. Poleski , P. Mroz , S. Kozlowski , P. Pietrukowicz , I. Soszynski , K. Ulaczyk , M. Pawlak , F. Abe , D. P. Bennett , R. Barry , T. Sumi , Y. Asakura , A. Bhattacharya , M. Donachie , A. Fukui , Y. Hirao , Y. Itow , N. Koshimoto , M. C. A. Li , C. H. Ling , K. Masuda , Y. Matsubara , Y. Muraki , M. Nagakane , N. J. Rattenbury , P. Evans , A. Sharan , D. J. Sullivan , D. Suzuki , P. J. Tristram , T. Yamada , T. Yamada , A. Yonehara

The Optical Gravitational Lensing Experiment. OGLE-III Long Term Monitoring of the Gravitational Lens QSO 2237+0305

We present results of the long term monitoring of the gravitational lens QSO 2237+0305 conducted during the OGLE survey. Light curves of all four components of the lens obtained during the second phase of the OGLE project (OGLE-II;…

Astrophysics · Physics 2008-11-26 A. Udalski , M. K. Szymanski , M. Kubiak , G. Pietrzynski , I. Soszynski , K. Zebrun , O. Szewczyk , L. Wyrzykowski , K. Ulaczyk , T. Wieckowski

Liverpool-Maidanak monitoring of the Einstein Cross in 2006$-$2019. I. Light curves in the $gVrRI$ optical bands and microlensing signatures

Quasar microlensing offers a unique opportunity to resolve tiny sources in distant active galactic nuclei and study compact object populations in lensing galaxies. We therefore searched for microlensing-induced variability of the…

Astrophysics of Galaxies · Physics 2020-05-27 L. J. Goicoechea , B. P. Artamonov , V. N. Shalyapin , A. V. Sergeyev , O. A. Burkhonov , T. A. Akhunov , I. M. Asfandiyarov , V. V. Bruevich , S. A. Ehgamberdiev , E. V. Shimanovskaya , A. P. Zheleznyak

X-ray microlensing in the quadruply lensed quasar Q2237+0305

We use archival data of NASA's Chandra X-ray telescope to compile an X-ray light curve of all four images of the quadruply lensed quasar Q2237+0305 (z=1.695) from January 2006 to January 2007. We fit simulated point spread functions to the…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 F. Zimmer , R. W. Schmidt , J. Wambsganss

First assessment of the binary lens OGLE-2015_BLG-0232

We present an analysis of the microlensing event OGLE-2015-BLG-0232. This event is challenging to characterize for two reasons. First, the light curve is not well sampled during the caustic crossing due to the proximity of the full Moon…

Earth and Planetary Astrophysics · Physics 2019-01-09 E. Bachelet , V. Bozza , C. Han , A. Udalski , I. A. Bond , J. -P. Beaulieu , R. A. Street , J. -I Kim , D. M. Bramich , A. Cassan , M. Dominik , R. Figuera Jaimes , K. Horne , M. Hundertmark , S. Mao , J. Menzies , C. Ranc , R. Schmidt , C. Snodgrass , I. A. Steele , Y. Tsapras , J. Wambsganss , P. Mróz , I. Soszyński , M. K. Szymański , J. Skowron , P. Pietrukowicz , S. Kozłowski , R. Poleski , K. Ulaczyk , M. Pawlak , F. Abe , R. Barry , D. P. Bennett , A. Bhattacharya , M. Donachie , A. Fukui , Y. Hirao , Y. Itow , K. Kawasaki , I. Kondo , N. Koshimoto , M. Cheung Alex Li , Y. Matsubara , Y. Muraki , S. Miyazaki , M. Nagakane , N. J. Rattenbury , H. Suematsu , D. J. Sullivan , T. Sumi , D. Suzuki , P. J. Tristram , A. Yonehara

Reconstruction of the microlensing light curves of the Einstein Cross, QSO2237+0305: possible evidence of an accretion disk with a central hole

Recent OGLE (Optical Gravitational Lensing Experiment) and GLITP (Gravitational Lens International Time Project) monitoring data for QSO 2237+0305 (Huchra et al.) have been analyzed through a newly optimized N-body microlensing analysis…

Astrophysics · Physics 2007-05-23 Dong-Wook Lee , J. Surdej , O. Moreau , C. Libbrecht , J. -F. Claeskens

OGLE-2017-BLG-0537: Microlensing Event with a Resolvable Lens in $\lesssim 5$ years from High-resolution Follow-up Observations

We present the analysis of the binary-lens microlensing event OGLE-2017-BLG-0537. The light curve of the event exhibits two strong caustic-crossing spikes among which the second caustic crossing was resolved by high-cadence surveys. It is…

Solar and Stellar Astrophysics · Physics 2018-08-15 Y. K. Jung , C. Han , A. Udalski , A. Gould , M. D. Albrow , S. -J. Chung , K. -H. Hwang , C. -U. Lee , Y. -H. Ryu , I. -G. Shin , Y. Shvartzvald , J. C. Yee , W. Zang , W. Zhu , S. -M. Cha , D. -J. Kim , H. -W. Kim , S. -L. Kim , D. -J. Lee , Y. Lee , B. -G. Park , R. W. Pogge , W. -T. Kim , P. Mróz , R. Poleski , J. Skowron , M. K. Szymański , I. Soszyński , S. Kozłowski , P. Pietrukowicz , K. Ulaczyk , M. Pawlak

OGLE-2017-BLG-0039: Microlensing Event with Light from the Lens Identified from Mass Measurement

We present the analysis of the caustic-crossing binary microlensing event OGLE-2017-BLG-0039. Thanks to the very long duration of the event, with an event time scale $t_{\rm E}\sim 130$ days, the microlens parallax is precisely measured…

Solar and Stellar Astrophysics · Physics 2018-11-28 C. Han , Y. K. Jung , A. Udalski , I. Bond , V. Bozza , M. D. Albrow , S. -J. Chung , A. Gould , K. -H. Hwang , D. Kim , C. -U. Lee , H. -W. Kim , Y. -H. Ryu , I. -G. Shin , J. C. Yee , Y. Shvartzvald , S. -M. Cha , S. -L. Kim , D. -J. Kim , D. -J. Lee , Y. Lee , B. -G. Park , R. W. Pogge , M. K. Szymański , P. Mróz , J. Skowron , R. Poleski , I. Soszyński , S. Kozłowski , P. Pietrukowicz , K. Ulaczyk , M. Pawlak , F. Abe , R. Barry , D. P. Bennett , A. Bhattacharya , M. Donachie , P. Evans , A. Fukui , Y. Hirao , Y. Itow , K. Kawasaki , N. Koshimoto , M. C. A. Li , C. H. Ling , Y. Matsubara , S. Miyazaki , H. Munakata , Y. Muraki , M. Nagakane , K. Ohnishi , C. Ranc , N. Rattenbury , T. Saito , A. Sharan , D. J. Sullivan , T. Sumi , D. Suzuki , P. J. Tristram , T. Yamada , A. Yonehara

Resolving the Vicinity of Supermassive Black Holes with Gravitational Microlensing

In the near future, wide field surveys will discover 1000's of new strongly lensed quasars, and these will be monitored with unprecedented cadence by the Legacy Survey of Space and Time (LSST). Many of these will undergo caustic-crossing…

Astrophysics of Galaxies · Physics 2024-07-16 Henry Best , Joshua Fagin , Georgios Vernardos , Matthew O'Dowd

The Optical Gravitational Lensing Experiment. Monitoring of QSO 2237+0305

We present results from 2 years of monitoring of Huchra's lens (QSO 2237+0305) with the 1.3 m Warsaw telescope on Las Campanas, Chile. Photometry in the V band was done using a newly developed method for image subtraction. Reliable…

Astrophysics · Physics 2009-10-31 P. R. Wozniak , C. Alard , A. Udalski , M. Szymanski , M. Kubiak , G. Pietrzynski , K. Zebrun , .

OGLE-2009-BLG-092/MOA-2009-BLG-137: A Dramatic Repeating Event With the Second Perturbation Predicted by Real-Time Analysis

We report the result of the analysis of a dramatic repeating gravitational microlensing event OGLE-2009-BLG-092/MOA-2009-BLG-137, for which the light curve is characterized by two distinct peaks with perturbations near both peaks. We find…

Solar and Stellar Astrophysics · Physics 2015-05-19 Y. -H. Ryu , C. Han , K. -H. Hwang , R. Street , A. Udalski , T. Sumi , A. Fukui , J. -P. Beaulieu , A. Gould , M. Dominik , F. Abe , D. P. Bennett , I. A. Bond , C. S. Botzler , K. Furusawa , F. Hayashi , J. B. Hearnshaw , S. Hosaka , Y. Itow , K. Kamiya , P. M. Kilmartin , A. Korpela , W. Lin , C. H. Ling , S. Makita , K. Masuda , Y. Matsubara , N. Miyake , Y. Muraki , K. Nishimoto , K. Ohnishi , Y. C. Perrott , N. Rattenbury , To. Saito , L. Skuljan , D. J. Sullivan , D. Suzuki , W. L. Sweatman , P. J. Tristram , K. Wada , P. C. M. Yock , M. K. Szymański , M. Kubiak , G. Pietrzyński , I. Soszyński , O. Szewczyk , Ł. Wyrzykowski , K. Ulaczyk , M. Bos , G. W. Christie , D. L. Depoy , A. Gal-Yam , B. S. Gaudi , S. Kaspi , C. -U. Lee , D. Maoz , J. McCormick , B. Monard , D. Moorhouse , R. W. Pogge , D. Polishook , Y. Shvartzvald , A. Shporer , G. Thornley , J. C. Yee , M. D. Albrow , V. Batista , S. Brillant , A. Cassan , A. Cole , E. Corrales , Ch. Coutures , S. Dieters , P. Fouqué , J. Greenhill , J. Menzies , A. Allan , D. M. Bramich , P. Browne , K. Horne , N. Kains , C. Snodgrass , I. Steele , Y. Tsapras , V. Bozza , M. J. Burgdorf , S. Calchi Novati , S. Dreizler , F. Finet , M. Glitrup , F. Grundahl , K. Harpsøe , F. V. Hessman , T. C. Hinse , M. Hundertmark , U. G. Jørgensen , C. Liebig , G. Maier , L. Mancini , M. Mathiasen , S. Rahvar , D. Ricci , G. Scarpetta , J. Skottfelt , J. Surdej , J. Southworth , J. Wambsganss , F. Zimmer