Around‐the‐Clock Observations of the Q0957+561A,B Gravitationally Lensed Quasar. II. Results for the Second Observing Season
Wesley N. ColleyDepartment of Astronomy, University of Virginia, P.O. Box 3818, Charlottesville, VA 22903Rudolph E. SchildHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS-19, Cambridge, MA 02138C. AbajasInstituto de Astrofísica de Canarias, Via Láctea, E-38200 La Laguna, Tenerife, Canary Islands, SpainD. AlcaldeInstituto de Astrofísica de Canarias, Via Láctea, E-38200 La Laguna, Tenerife, Canary Islands, SpainZeki AslanPhysics Department, Akdeniz University, 07058 Antalya, TurkeyI. BikmaevKazan State University, Kremlevskaya Strasse 18, 420008 Kazan, RussiaV. ChavushyanInsituto Nacional de Astrofísica Optica y Electrónica, Apartado Postal 51 y 216, C.P. 72840, Puebla, Puebla, MéxicoL. M. ChinarroInstituto de Astrofísica de Canarias, Via Láctea, E-38200 La Laguna, Tenerife, Canary Islands, SpainJean‐Philippe CournoyerDépartement de physique, Université de Montréal, C.P. 6128, succ. Centre-ville, Montréal, QC H3C 3J7, Canada; and Observatoire du mont Mégantic, CanadaR. CroweUniversity of Hawaii at Hilo, 200 West Kawili Street, Hilo, HI 96720В. Н. ДудиновAnna Kathinka Dalland EvansUniversity of Oslo, Institute of Theoretical Astrophysics, P.O. Box 1029, Blindern, Oslo N-0315, NorwayYoung‐Beom JeonSeoul National University, Astronomy Program, SEES, Shinlim-Dong, Seoul 151-742, KoreaL. J. GoicoecheaDepartamento de Fisica Moderna, Universidad de Cantabria, E-39005 Santander, Cantabria, SpainO. GölbasiTubitak National Observatory, Akdeniz Universitesi Kampusu, 07058 Antalya, Turkeyİrek KhamitovTubitak National Observatory, Akdeniz Universitesi Kampusu, 07058 Antalya, TurkeyKjetil KjernsmoUniversity of Oslo, Institute of Theoretical Astrophysics, P.O. Box 1029, Blindern, Oslo N-0315, NorwayHyun Ju LeeSeoul National University, Astronomy Program, SEES, Shinlim-Dong, Seoul 151-742, KoreaJong‐Hwan LeeDACOM Corporation, Internet Technology Division, DACOM Building, 706-1, Yeoksam-dong, Kangnam-ku, Seoul 135-610, KoreaKi Won LeeUniversity College London, Gower Street, London, WC1E 6BT, UKMyung Gyoon LeeSeoul National University, Astronomy Program, SEES, Shinlim-Dong, Seoul 151-742, KoreaOmar Lopez‐CruzFulbright Visiting Scholar at the Observatories of the Carnegie Institution of Washington (OCIW), 1530 P Street NW, Washington, DC 20005E. MediavillaInstituto de Astrofísica de Canarias, Via Láctea, E-38200 La Laguna, Tenerife, Canary Islands, SpainA. F. J. MoffatDépartement de physique, Université de Montréal, C.P. 6128, succ. Centre-ville, Montréal, QC H3C 3J7, Canada; and Observatoire du mont Mégantic, CanadaRaúl MújicaInsituto Nacional de Astrofísica Optica y Electrónica, Apartado Postal 51 y 216, C.P. 72840, Puebla, Puebla, MéxicoA. UllánDepartamento de Fisica Moderna, Universidad de Cantabria, E-39005 Santander, Cantabria, SpainJ. A. MuñozInstituto de Astrofísica de Canarias, Via Láctea, E-38200 La Laguna, Tenerife, Canary Islands, SpainAlexander OscozInstituto de Astrofísica de Canarias, Via Láctea, E-38200 La Laguna, Tenerife, Canary Islands, SpainMyeong‐Gu ParkKyungpook National University, Taegu 702-701, KoreaN. G. PurvesUniversity of Hawaii at Hilo, 200 West Kawili Street, Hilo, HI 96720Oyvind SaanumUniversity of Oslo, Institute of Theoretical Astrophysics, P.O. Box 1029, Blindern, Oslo N-0315, NorwayН. А. СахибуллинKazan State University, Kremlevskaya Strasse 18, 420008 Kazan, RussiaM. Serra‐RicartInstituto de Astrofísica de Canarias, Via Láctea, E-38200 La Laguna, Tenerife, Canary Islands, SpainI. Ye. SinelnikovR. StabellUniversity of Oslo, Institute of Theoretical Astrophysics, P.O. Box 1029, Blindern, Oslo N-0315, NorwayAlan StocktonUniversity of Hawaii at Hilo, 200 West Kawili Street, Hilo, HI 96720J. TeuberDanish Library for Natural and Medical Sciences, Nørre Allé 49, 2200 Copenhagen N, DenmarkR. Stephen ThompsonUniversity of Hawaii at Hilo, 200 West Kawili Street, Hilo, HI 96720Hwa‐Sung WooKyungpook National University, Taegu 702-701, KoreaAlexander Zheleznyak
2003en
ABI
Аннотация
We report on an observing campaign in March 2001 to monitor the brightness of the later arriving Q0957+561 B image in order to compare with the previously published brightness observations of the (first arriving) A image. The 12 participating observatories provided 3543 image frames which we have analyzed for brightness fluctuations. From our classical methods for time delay determination, we find a 417.09 +/- 0.07 day time delay which should be free of effects due to incomplete sampling. During the campaign period, the quasar brightness was relatively constant and only small fluctuations were found; we compare the structure function for the new data with structure function estimates for the 1995--6 epoch, and show that the structure function is statistically non-stationary. We also examine the data for any evidence of correlated fluctuations at zero lag. We discuss the limits to our ability to measure the cosmological time delay if the quasar's emitting surface is time resolved, as seems likely.
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