<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Céline and Mordecai,<div class=""><br class=""></div><div class="">Thanks for referring to us Mordecai!</div><div class=""><br class=""></div><div class="">It’s true, we have a radiative transfer model in FLASH based on a tree (Wünsch+2021, Wünsch+2018).</div><div class="">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.</div><div class=""><br class=""></div><div class="">Best,</div><div class="">Steffi<br class=""><div class=""><div class=""><div><div class=""><div>===============================<br class="">Prof. Dr. Stefanie Walch-Gassner<br class="">I. Physikalisches Institut<br class="">Universität zu Köln<br class="">Zülpicher Straße 77<br class="">50937 Köln<br class="">Germany<br class=""><a href="mailto:walch@ph1.uni-koeln.de" class="">email: walch@ph1.uni-koeln.de</a><br class="">phone: +49 (0) 221 4703497</div><div class=""><br class=""></div></div><blockquote type="cite" class=""><div class="">On 24. Jun 2021, at 17:13, Mordecai-Mark Mac Low <<a href="mailto:mordecai@amnh.org" class="">mordecai@amnh.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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<div class="">Date: Thu, 24 Jun 2021 12:13:21 +0000<br class="">
From: Celine Hue <<a href="mailto:celine.hue@weizmann.ac.il" class="">celine.hue@weizmann.ac.il</a>><br class="">
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Dear Flash users,<br class="">
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?<br class="">
Thank you a lot<br class="">
C?line<br class="">
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Dear Céline,</div>
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<div class="">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 <a href="https://torch-sf.bitbucket.io/" class="">https://torch-sf.bitbucket.io/</a>,
and we invite users to join our mailing list and weekly users-group meeting on Zoom as well.</div>
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<div class="">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.</div>
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<div class="">Best,</div>
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<div class="">Mordecai-Mark Mac Low</div>
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--<br class="">
Mordecai-Mark Mac Low (he/him) <span class="Apple-tab-span" style="white-space: pre;">
</span>Curator-in-Charge & Professor<br class="">
+1-212-496-3443 <span class="Apple-tab-span" style="white-space: pre;"> </span>
Department of Astrophysics<br class="">
+1-212-769-5007 (fax) <span class="Apple-tab-span" style="white-space: pre;"> </span>
American Museum of Natural History<br class="">
mmaclow (Skype, Hangout) <span class="Apple-tab-span" style="white-space: pre;">
</span>79th St at CPW, NY, NY, 10024-5192, USA</div>
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