3D-PDR is a three-dimensional photodissociation region code written in Fortran. It uses the Sundials package (written in C) to solve the set of ordinary differential equations and it is the successor of UCL_PDR, a one-dimensional PDR code written at UCL. Using the HEALpix ray-tracing scheme, 3D-PDR solves a three-dimensional escape probability routine and evaluates the attenuation of the far-ultraviolet radiation in the PDR and the propagation of FIR/submm emission lines out of the PDR.

The code is parallelized (OpenMP) and can be applied to 1D and 3D problems. The GitHub package includes: the 3D-PDR code, three different chemical networks (33, 58, and 128 species) and molecular data, the Sundials solver, and a set of various 1D uniform density clouds and a uniform density spherical distribution to test the 3D version of the code. To `make' 3D-PDR, you will first need to install the Sundials package and link 3D-PDR with the ODE solver. Please see the manual for instructions on how to do this step-by-step.

3D-PDR works with the gfortran version 4.8.4 and the ifort version 14.0.4. Later compiler versions may require adjustments in the code.

### Usage

You are free to download and use the code for your work provided that you will cite the paper by Bisbas T.G. et al., 2012, MNRAS, 427, 2100

### Authors and Contributors

Main author: Thomas G. Bisbas (@tbisbas).

Contributors: Serena Viti, Michael J. Barlow, Jeremy Yates, Tom Bell.

The development of the code has been funded by STFC grants ST/H001794/1 and ST/J001511/1.

### Published papers using 3D-PDR

A number of papers have been using 3D-PDR for studying Photodissociation Regions in 1D and 3D:

- Bisbas T.G., Tanaka, K.E.I., Tan, J.C. et al., (2017)
- Bisbas T.G., van Dishoeck E.W., Papadopoulos P.P. et al., (2017)
- Bothwell M.S., Aguirre J.E., Aravena M., et al., (2017)
- Accurso G., Saintoge A., Bisbas T.G. and Viti S., (2016)
- Facchini S., Clarke C. and Bisbas T.G. (2016)
- Bisbas T.G., Haworth T.J., Barlow M.J., et al., (2015)
- Bisbas T.G., Papadopoulos P.P. and Viti S., (2015)
- Gaches B.A.L., Offner S.S.R., Rosolowsky E.W. and Bisbas T.G., (2015)
- Offner S.S.R., Bisbas T.G., Bell T.A. and Viti S. (2014)
- Bisbas T.G., Bell T.A., Viti S., et al., (2014)
- Offner S.S.R., Bisbas T.G., Viti S. and Bell T.A. (2013)

### Support or Contact

Included in the repository is a PDF manual. Any further questions can be directed to tbisbas at ufl.edu