Lorentz Center - How to weigh clusters of galaxies from 19 Apr 2010 through 23 Apr 2010
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    How to weigh clusters of galaxies
    from 19 Apr 2010 through 23 Apr 2010

 

Program

 

 

Meetings are in room 201 of the Huygens building unless mentioned otherwise.

 

Discussions: we will discuss and compare all techniques that are currently available and explore in more detail which problems are merely perceived, and which are real. We hope to remove prejudices (if there are any) and consider the benefits of the complementarities of other techniques. (Except on Friday) the discussion will be led by a moderator, an expert in the topic and to contrast this, a second moderator in another technique who will challenge the assertions of the first moderator. In particular the second moderator will highlight the wider perception that may exist in the community.

 

Discussions (except informal) are plenary and take place in 201

 

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Monday 19 April 2010

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12:30 - 13:50     Lunch + Informal discussion

 

13:50 - 14:00     Welcome by the Lorentz Center

14:00 - 14:30     Pat Henry: How are masses measured from X-ray data

14:30 - 15:00     Hans Böhringer: X-ray studies of galaxy clusters

15:00 - 15:30     Coffee/tea break

 

15:30 - 16:30     Discussion on how the systematics of X - ray studies impact

                            cosmological parameters

·      which parameters are affected?

·      can we use self-calibration?

                            Moderators: Pat Henry and Hans Hans Böhringer

 

16:30 - 16:45     Short talk on recent results (Jelle de Plaa)

16:45 - 17:00     Huub Rottgering: LOFAR

 

 

                                           (Wine and cheese party is rescheduled to Tuesday end of the day)

 

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Tuesday 20 April 2010

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09:30 - 10:00     Andrea Biviano: Galaxy dynamics as a probe of cluster mass

10:00 - 10:30    

10:30 - 11:00     Coffee/tea break

 

11:00 - 11:30     Discussion on issues with optical surveys            

·      issue of projections along the line-of-sight

·      centering/substructure

·      which observables to use?

                            Moderators: Peter Katgert and …

 

11:30 - 12:00     Lindsay King: Strong lensing

12:00 - 12:30     Henk Hoekstra: Weak lensing

 

12:30 - 14:00     Lunch + Informal discussion

 

14:00 - 14:30     Graham Smith: Combining lensing with other probes

14:30 - 15:00     2 short talks on recent results (Yu-Ying Zhang and Rocco Piffaretti)

15:00 - 15:30     Discussion: limitations of lensing. Moderators Graham Smith and

                            Massimo Meneghetti

 

15:30 - 16:00     Coffee/tea break

 

16:30 - 17:30     Discussion: how do the systematics of optical studies

                            impact cosmological parameters.

·      which parameters are affected?

·      can we use self-calibration?

                            Moderators: Alexis Finoguenov and…

                           

 

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Wednesday 21 April 2010

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09:30 - 10:00        Stefania Giodini: groups and low mass clusters

10:00 - 10:30        Alexis Finoguenov: Benefits of multi-wavelength surveys

10:30 - 11:00        Coffee/tea break

11:00 - 11:30        Arif Babul: Sunyaev-Zel’dovich effect to find and study clusters

 

 

11:30 - 12:30        Discussion about the limitations of X-ray (only) observations

·  how important are AGN, substructures, etc?

·  how can we deal with them?

·  what are the issues for high-redshift clusters?

·  which observations complement each other?

·  what parameters can be constrained

·   how can we find reliable samples of high redshift

   clusters

                               Moderators: Arif Babul and Alexis Finoguenov

 

 

12:30 - 14:00        Lunch + Informal discussion

 

14:00 - 14:30        Short talk on recent results (Chris Bildfell)

14:30 - 15:00        Short talk on recent results (Hendrik Hildebrandt)

                              

15:00 - 15:30        Coffee/tea break

 

15:30 - 15:45        Short talk on recent results (Theo Nieuwenhuizen)

15:45 - 16:30        Discussion: how to obtain masses for clusters at high redshift?

·      are mergers an issue?

·      how to deal with forming clusters?

                               Moderators: Hans Böhringer and Henk Hoekstra

 

16:30 - 17:00        Miley: Proto-clusters

 

19:00 - 22:00        Workshop dinner@De Regentenkamer

                               Menu (link)

                               Sign up here

                               Map to get to the Regentenkamer

 

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Thursday 22 April 2010

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11:30 - 12:00        Arif Babul: Sunyaev-Zel’dovich effect to find and study clusters

 

12:00 - 12:30        Discussion on simulations

·  what cluster physics is simulated well?

·  what cluster physics is missing?

·  how can we improve the link between observations and   simulations?

·  what aspects of galaxy formation can we constrain best?

                               Moderators: Arif Babul and Joop Schaye

 

12:30 - 14:00        Lunch@Gorlaeus Restaurant + Informal discussion

 

14:00 - 14:30        Massimo Meneghetti: using simulations to interpret observations

                               (skype)

14:30 - 15:30        Discussion: masses of groups, moderator Gary Mamon

15:30 - 16:00        Coffee/tea break

16:00 - 17:00        Discussion on future plans

·  what observations are needed?

·  how many clusters should be observed?

·  how to select such a sample?

·  what science questions can we address?

Moderators: Graham Smith, Hans Böhringer and Henk Hoekstra

 

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Friday 23 April 2010

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09:30 - 10:00            

10:00 - 10:30             

10:30 - 11:00        Coffee/tea break

11:00 - 12:30             

 

12:30 - 13:30        Lunch@Huygens Restaurant + Informal discussion

                               (Gorlaeus Restaurant is closed)

 

13:30 - 14:30        Final discussion:

·  should we set up a global collaboration?

·  produce a list of issues that need to be addressed in order to convince the community that masses can be measured accurately

·  closing remarks

 

=== end of workshop ===

 

 

 



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