Powderday: Dust Radiative Transfer for Galaxy Simulations
Abstract
We present Powderday, a flexible, fast, open-source dust radiative transfer package designed to interface with galaxy formation simulations. Powderday builds on FSPS population synthesis models, Hyperion dust radiative transfer, and employs yt to interface between different software packages. We include our stellar population synthesis modeling on the fly, which allows for significant run-time flexibility in the assumed stellar physics. We include a model for nebular line emission that can employ either precomputed Cloudy lookup tables (for efficiency), or direct photoionization calculations for all young stars (for flexibility). The dust content follows either observationally-motivated prescriptions, direct modeling from galaxy formation simulations, or a novel approach that includes the dust content via learning-based algorithms from the SIMBA cosmological galaxy formation simulation. AGN can additionally be included via a range of prescriptions. The output of these models are broadband SEDs, as well as filter-convolved images. Powderday is designed to eliminate last-mile efforts by researchers that employ different hydrodynamic galaxy formation models, and seamlessly interfaces with GIZMO, AREPO, GASOLINE, CHANGA, and ENZO. We demonstrate the capabilities of the code via three applications: a model for the star formation rate (SFR) - infrared luminosity relation in galaxies (including the impact of AGN); the impact of circumstellar dust around AGB stars on the mid-infrared emission from galaxy SEDs; and the impact of galaxy inclination angle on dust attenuation laws.
Cite
@article{arxiv.2006.10757,
title = {Powderday: Dust Radiative Transfer for Galaxy Simulations},
author = {Desika Narayanan and Matthew J. Turk and Thomas Robitaille and Ashley J. Kelly and B. Connor McClellan and Ray S. Sharma and Prerak Garg and Matthew Abruzzo and Ena Choi and Charlie Conroy and Benjamin D. Johnson and Benjamin Kimock and Qi Li and Christopher C. Lovell and Sidney Lower and George C. Privon and Jonathan Roberts and Snigdaa Sethuram and Gregory F. Snyder and Robert Thompson and John H. Wise},
journal= {arXiv preprint arXiv:2006.10757},
year = {2021}
}
Comments
Submitted to ApJ; comments welcome