Minutes for the teleconference on 24/04/2007, 18:00 CEST
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1. Participants:

   Aleksi, Daniela, Hendrik, Marco, Marusa, Peter, Thomas, Tim
 
2. Status of current work:

- Marusa performed a first strong lensing analysis using the
  lenstool from Jean-Paul Kneib. It allows to search for a systematic
  search of possible multiple image candidates for a particular
  source (given a first, rough model). With the help of this tool
  a first model is constructed using 4 to 5 multiple image candidates.
  For a further analysis redshifts are needed !!

- Marusa perfomed a first, non-parametric strong and weak lensing
  analysis based on the ACS data only (not using ground based data).
  For the weak lensing analysis, a KSB based shape catalogue is used.
  The result so far is that the weak and strong lens models agree
  fairly well. This work is in good shape to be written up soon.

- Marusa collaborates with Steve Allen on his new Chandra observations
  from RXJ1347. Those data are part of a larger cluster sample and
  Steve Allen offered Marusa to use the Chandra data for our analysis.
  (In this case a student of Steve Allen is part of publications where
  we use the data)
  The data are fully processed and immediately ready to use.
  A first analysis based on our VLT lensing analysis suggests that
  cluster masses from X-Ray and lensing are in a better agreement now
  than they were before.

- Aleksi constructed a first detailed strong lensing model based on 
  morphology and colour information in the ACS data. He uses several
  multiple image candidates inlcuding one object with 5 images.
  As for Marusas work we need the spectra to make significant progress 
  here. The work is in good shape to be written up soon.

- Marco obtained a set of very good observations in our VLT run for
  spectroscopy in March. A first, quick and dirty analysis showed
  that a thorough reduction is necessary for the faint arc and multiple
  image candidates (as expected).

3. Todos and planed work for the next months

- We need to clarify with Sabine what can/should be done on the X-Ray
  side and how we integrate XMM and Chandra data in our analysis.

- Marco will process the spectra with a new FORS spectra analysis
  pipeline developed at ESO.
  When the results are there we decide whether we write a paper
  based on the spectra only (similar to Cohen and Kneib).

- We write (at least) two papers with the current results:

  - Marusa and Aleksi compare their current strong lensing models.     
    Because we want to present both in separate publications     
    (see below) they should give consistent results.

  - One publication presents spectra (
    depending on whether the stand-alone spectra
    paper will be written or not), arcs and multiple image systems and
    a non parametrioc strong lens model (Aleksi)

  - One publication presents Marusas current strong and weak lens combination
    based on ACS data. A first comparison with new X-Ray data
    should be presented here as an inprovement of the agreement of
    lensing and X-Ray analysis is indicated by the Chandra data
    (see above; details of the X-Ray part need to be clarified also
    with Sabine)

- Daniela (a diploma student in Bonn) will start to work on the
  wide-field ground-based data (WFI data from the MPG/ESO 2.2m and
  MEGACAM data from the CFHT) with the weak lensing effect and extend the
  comparison of strong and weak lensing to larger angular scales.

- Hendrik will work on refined photometric redshifts once spectra
  are available (for calibration purposes).

- At a later stage we will use a refined weak lensing analysis
  (ground- and space-based) with Marco's implementation of
  the shapelet analysis technique to measure object shapes.
  This is a longer term project.