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Benchmarks for the Transport of Radiation through a DUSTy Medium

Benchmark VII: Star and Filament

This is a benchmark problem for continuum radiative transfer, including a cloud filament that is illuminated either by isotropic background or by a point source. See TRUST web page for detailed description of the benchmark problem.

Preliminary results

Below are plots for the results of CRT, AMR, and SOC programs. Each figure shows surface brightness for four wavelengths (panels of different colour), two view directions ('x' and 'z'), and three optical depths (three rows of frames).The models (1a, 1b, 2a, 2b), the codes, and the wavelengths are given in the figures.The number above each frame gives the average surface brightness (MJy/sr) calculated over the total map area.

 

CRT





 

AMR



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SOC







 

 

Old preliminary results.

Below are links for preliminary results. These are calculated using a uniform 128×128×128 grid and the maps are 300×300 pixels in size. Results are included here only as seen from the direction from the positive x-axis. The wavelengths (0.5569µm, 2.299µm, 107.78µm and 444.83µm) as well as the name of the test problem (1a, 1b, 2a, and 2b) are indicated in the file names. Files are given here for the optical depths of 5.0 and 20.0.

 


 

Below are some older results. Note that these maps use the wavelengths of 0.55µm, 2.2µm, 100µm, and 500µm instead of the exact wavelengths selected for the benchmark VII.

Results for a 643 uniform grid.

Case 1a: straight cylindrical filament illuminated by an isotropic background. The following images show the surface brightness for scattered light at 0.55µm and 2.20µm and for dust emission at 100µm and 500µm. Calculations are done using effective dust properties, ignoring transient heating of the dust particles. There are three separate images for cases where the 1.0µm optical depth perpendicular to the filament is either 5.0, 20.0, or 100.0. Within each image, the two rows correspond to different wavelengths and the columns to three orthogonal viewing directions.

Scattered light images for filaments with 1µm optical depths perpendicular to symmetry axis equal to 5.0, 20.0, and 100.0.

Images of dust emission for cases with 1µm optical depth 5.0, 20.0, and 100.

 

Case 1b: Straight filament illuminated by a single point source.

Images of scattered light (cases with 1µm optical depth 5.0, 20.0, and 100.0):

Images of dust emission. Images correspond to cases with 1µm optical depth 5.0, 20.0, and 100.0.

 

Case 2a: a spiraling filament illuminated by an isotropic background. The following images show the surface brightness for scattered light at 0.55µm and 2.20µm and for dust emission at 100µm and 500µm. Calculations are done using effective dust properties, ignoring transient heating of the dust particles. There are three separate images for cases where the 1.0µm optical depth perpendicular to the filament is either 5.0, 20.0, or 100.0.

Scattered radiation.

Emitted radiation.

 

Case 2b: a spiraling filament illuminated by a single point source. The following images show the surface brightness for scattered light at 0.55µm and 2.20µm and for dust emission at 100µm and 500µm. Calculations are done using effective dust properties, ignoring transient heating of the dust particles. There are three separate images for cases where the 1.0µm optical depth perpendicular to the filament is either 5.0, 20.0, or 100.0.

Scattered radiation.

Emitted radiation.

 

Data files

The following files contain some results calculated on a uniform 1283 grid.

    • Spectra towards the x direction at positions (y,z)=(0.0pc, 2.5pc) and (y,z)=(0.0, 7.5pc) (text files, note that these contain thermal emission only).
    • Images at 0.55µm, 2.2µm, 100µm and 500µm, towards the x-direction (FITS images).

 

 

 

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