[santacruzgalaxy-list] Fwd: Working group XIII discussion at AGORA workshop

[Ji-hoon Kim]

Dear AGORA Colleagues, 

In addition to the planned breakout sessions in the 3rd Workshop, we will have another one focusing on the imminent topics for the science-oriented Working Group XIII - BH Accretion and Feedback (4:00 pm PDT, Aug. 16).  Many thanks to Alex Hobbs (ETH) for organizing and leading this discussion.  At the end of this discussion, we will try to propose SMBH model(s) for the use in subsequent AGORA simulations and comparisons. 

Please see the latest Workshop program (https://sites.google.com/site/santacruzcomparisonproject/workshops/3rd-workshop) and the attached email from Alex for more information.  Feel free to join us if interested.  The SeeVogh information was included in my earlier announcement.  

Sincerely,
Ji-hoon Kim for the LOC



-------------------------------------------------------------------------
Ji-hoon Kim
Postdoctoral Scholar in Astrophysics at Caltech
www.jihoonkim.org 
me at jihoonkim.org / 1(650)714-2879 
-------------------------------------------------------------------------






Begin forwarded message:

> From: Alexander Hobbs <ahobbs at phys.ethz.ch>
> Subject: Re: Working group XIII discussion at AGORA workshop
> Date: August 15, 2014 at 5:28:22 AM PDT
> To: tabel at stanford.edu, cdegraf at phys.huji.ac.il, fabrice.durier at gmail.com, phopkins at astro.berkeley.edu, kashia at physics.unlv.edu, kellerbw at mcmaster.ca, Lucio Mayer <lucio at phys.ethz.ch>, daisuke.nagai at yale.edu, Rick Newton <newton at jb.man.ac.uk>, oshea at msu.edu, chris.power at icrar.org, "justin.inglis.read" <justin.inglis.read at gmail.com>, Romain Teyssier <romain.teyssier at gmail.com>
> Cc: Ji-hoon Kim <me at jihoonkim.org>
> 
> Hello again,
> 
> Ok it seems that no-one has a problem with the time slot so we will confirm that with Ji-hoon. For the discussion we will go over what was decided at the last AGORA workshop (however there was only two of us so it is fairer to include more of you this time!) and make sure everyone agrees. Then there is some voting on various decision items to be done. A quick summary of the plan is:
> 
> ----------
> 
> Main action items for discussion/vote:
> 
> For the simulations we will
> 
> (i) choose ONE accretion model for isolated discs, implement it across all codes & run simulation
> (ii) choose ONE accretion model for cosmological runs, implement it across all codes & run simulation
> (iii) choose preferred accretion model(s) in each code, implement it & run simulation
> 
> So to start with, we will all use the same BH accretion model, which will be the result of a vote. This model may be different (or the same) for the isolated discs and the cosmological runs (in my talk I argue for using different models because with the isolated discs we can be at a much higher resolution). Subsequent to these runs being performed, each member will be able to choose their preferred accretion model and re-run the simulation. It is hoped that this last task will involve several different models, overlapping across codes, so that interesting comparisons can be made.
> 
> Before action items (i) & (ii), however, it is recommended that everyone in the group reads the following papers in detail (if you haven't already) in order to make an informed decision about the accretion model (also see AGORA working group XIII talk):
> 
> http://adsabs.harvard.edu/abs/2013MNRAS.431.2513W
> http://arxiv.org/abs/1304.0443
> http://adsabs.harvard.edu/abs/2013MNRAS.432.3401G
> http://adsabs.harvard.edu/abs/2014MNRAS.443.1125T
> 
> plus the original papers for each model as referenced in my talk. The models in my talk from last workshop are not an exhaustive list, since subsequent relevant models may have been developed since. I will try to add any promising new ones and briefly summarise each one. If anyone knows of a particular model that they think would be useful then you are very welcome to mention and summarise it and we will add it to the voting list.
> 
> Other points discussed + open questions:
> 
> If the BH accretion model chosen for the isolated disks is indeed a different one to the cosmo runs, we should probably also run an isolated disk with the SAME model as in the cosmo runs, to see how it scales to the very highest resolution.
> We need to decide upon a (basic) list of what data will be saved when accretion occurs in the simulations. I will create a space on the Wiki for people to post suggestions.
> We need to decide upon the mode of feedback (thermal vs. kinetc) which again can be different between the isolated disks and the cosmo runs. We also need to make sure that the implementation of the feedback will be consistent between SPH and grid codes.
> 
> For the cosmo runs only, we
> 
> (i) need to decide upon a merger strategy
> (ii) need to decide upon a BH seeding strategy
> (iii) need to decide whether we will fix the BH to the centre of the potential to prevent wandering (which can lead to numerical artifacts)
> 
> ----------
> 
> If anyone has any questions before the session feel free to email me, otherwise, I will see you on the SeeVogh hangout!
> 
> Cheers,
> Alex
> 
> 
> On 13 Aug 2014, at 23:17, Alexander Hobbs <ahobbs at phys.ethz.ch> wrote:
> 
>> Dear Working group XIII,
>> 
>> The 3rd AGORA workshop approaches and we have been scheduled for a breakout session on Saturday 16th August, in the last slot of the day between 16.00 and 17.30 (Santa Cruz time which I believe is PDT). I will be sending some more information through about the discussion plan for this session, but in the meantime I would like everyone who is planning to attend/tune in to check that this time slot is acceptable. If anyone has a very strong feeling about changing the time slot, please let myself and Ji-hoon know.
>> 
>> Many thanks,
>> Alex
>> 
>> 
>> —
>> Alexander Hobbs
>> ETH Zürich


-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.ucsc.edu/pipermail/santacruzgalaxy-list/attachments/20140815/6c640b99/attachment.html