[FLASH-USERS] photoionization in FLASH

[Celine Hue]

Thank you very much for the informations! I wasn’t so well informed that so many progresses has been done with FLASH, it should be written in the User Guide :)!! I pretty would like to help write the corresponding parts for future users if needed. By the way, it should be a good idea to have a GitHub for Flash developers? I am pretty sure that I am not the first person who had got this idea. Or maybe there are some specific reasons that it hasn’t been done. Would like to help if needed.

On 24 Jun 2021, at 18:55, Prof. Dr. Stefanie Walch-Gassner <walch at ph1.uni-koeln.de<mailto:walch at ph1.uni-koeln.de>> wrote:

Hi Céline and Mordecai,

Thanks for referring to us Mordecai!

It’s true, we have a radiative transfer model in FLASH based on a tree (Wünsch+2021, Wünsch+2018).
The module is available for the simple implementation of isothermal ionised gas by request. In this case just email me and I’ll get you in touch with Richard Wünsch.

Best,
Steffi
===============================
Prof. Dr. Stefanie Walch-Gassner
I. Physikalisches Institut
Universität zu Köln
Zülpicher Straße 77
50937 Köln
Germany
email: walch at ph1.uni-koeln.de<mailto:walch at ph1.uni-koeln.de>
phone: +49 (0) 221 4703497

On 24. Jun 2021, at 17:13, Mordecai-Mark Mac Low <mordecai at amnh.org<mailto:mordecai at amnh.org>> wrote:

Date: Thu, 24 Jun 2021 12:13:21 +0000
From: Celine Hue <celine.hue at weizmann.ac.il<mailto:celine.hue at weizmann.ac.il>>

Dear Flash users,
I am writing to ask about the ways to simulation photoionizations in FLASH. I have gone through the user guide, it seems that the actual ionization methods implemented in FLASH are by collision temperatures. Is there any modules about photoionization? Or, is there someone have experiences about how to implement it?
Thank you a lot
C?line

Dear Céline,

The MORAY method of ray-tracing for photoionization relying on HEALPIX pixellation of the sphere (Wise & Abel 2009) was implemented into Flash in the FERVENT module (Baczynski et al. 2015).  A simplified version of this algorithm (only following H photoionization) is included in the TORCH framework, which integrates Flash into the Astrophysical Multipurpose Software Environment (AMUSE) alongside N-body and stellar evolution codes (Wall et al. 2019, 2020).  Torch is publicly available at https://torch-sf.bitbucket.io/, and we invite users to join our mailing list and weekly users-group meeting on Zoom as well.

Another approach implemented into Flash by the SILCC group (Walch et al. 2015) was TreeCol (Clark, Glover, et al. 2012).  This was described as TreeRay by Wünsch et al. (2021), which I would certainly recommend as useful reading and insight into what may be available to use.

Best,

Mordecai-Mark Mac Low



--
Mordecai-Mark Mac Low (he/him)  Curator-in-Charge & Professor
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