Flux and color variations of the quadruply imaged quasar HE 0435-1223

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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DOI

  • Author: Ricci, D.

    Université de Liège, Département d’Astrophysique

  • Author: Poels, J.

    Université de Liège, Département d’Astrophysique

  • Author: Elyiv, A.

    Université de Liège, Département d’Astrophysique

  • Author: Finet, F.

    Université de Liège, Département d’Astrophysique

  • Author: Sprimont, P.G.

    Université de Liège, Département d’Astrophysique

  • Author: Anguita, T.

    Max Planck Institute

  • Author: Bozza, V.

    Università degli Studi di Salerno

  • Author: Browne, P.

    University of St Andrews, School of Physics & Astronomy

  • Author: Burgdorf, M.

    Universitaet Stuttgart, Deutsches SOFIA Institut

  • Author: Calchi Novati, S.

    Istituto Internazionale per gli Alti Studi Scientifici (IIASS)

  • Author: Dominik, M.

    University of St Andrews, School of Physics & Astronomy

  • Author: Dreizler, S.

    Georg-August-Universität Göttingen, Institut für Astrophysik

  • Author: Glitrup, M.

    Aarhus University

  • Author: Grundahl, F.

    Aarhus University

  • Author: Harpsøe, K.

    University of Copenhagen

  • Author: Hessman, F.

    Georg-August-Universität Göttingen, Institut für Astrophysik

  • Author: Hinse, T. C.

    University of Copenhagen

  • Author: Hornstrup, Allan

    IT-Department, National Space Institute, Technical University of Denmark, Elektrovej, 2800, Kgs. Lyngby, Denmark

  • Author: Hundertmark, M.

    Georg-August-Universität Göttingen, Institut für Astrophysik

  • Author: Jørgensen, U. G.

    University of Copenhagen

  • Author: Liebig, C.

    Universität Heidelberg, Zentrum für Astronomie

  • Author: Maier, G.

    Universität Heidelberg, Zentrum für Astronomie

  • Author: Mancini, L.

    Università del Sannio, Dipartimento di Ingegneria

  • Author: Masi, G.

    Bellatrix Astronomical Observatory, Center for Backyard Astrophysics

  • Author: Mathiasen, M.

    University of Copenhagen

  • Author: Rahvar, S.

    Sharif University of Technology, Physics Department

  • Author: Scarpetta, G.

    Instituto Nazionale di Fisica Nucleare

  • Author: Skottfelt, J.

    University of Copenhagen

  • Author: Snodgrass, C.

    European Southern Observatory

  • Author: Southworth, J.

    Keele University, Astrophysics Group

  • Author: Teuber, J.

    University of Copenhagen

  • Author: Thöne, C. C.

    University of Copenhagen

  • Author: Wambsganß, J.

    Universität Heidelberg, Zentrum für Astronomie

  • Author: Zimmer, F.

    Universität Heidelberg, Zentrum für Astronomie

  • Author: Zub, M.

    Universität Heidelberg, Zentrum für Astronomie

  • Author: Surdej, J.

    Géophysique et Océanographie, Département d’Astrophysique

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Aims: We present VRi photometric observations of the quadruply imaged quasarHE0435-1223, carried out with the Danish 1.54 m telescope at the La Silla Observatory. Our aim was to monitor and study the magnitudes and colors of each lensed component as a function of time. Methods. We monitored the object during two seasons (2008 and 2009) in the VRi spectral bands, and reduced the data with two independent techniques: difference imaging and point spread function (PSF) fitting. Results. Between these two seasons, our results show an evident decrease in flux by ≈ 0.2-0.4 magnitudes of the four lensed components in the three filters. We also found a significant increase (≈ 0.05-0.015) in their V - R and R - i color indices. Conclusions. These flux and color variations are very likely caused by intrinsic variations of the quasar between the observed epochs. Microlensing effects probably also affect the brightest "A" lensed component. © ESO, 2011.
Original languageEnglish
JournalAstronomy & Astrophysics
Publication date2011
Volume528
PagesA42
Number of pages8
ISSN0004-6361
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 5

Keywords

  • Techniques: photometric, Quasars: general, Gravitational lensing: weak
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