Photodissociation of CO

This webpage is intended to be used in conjunction with the paper by Visser, van Dishoeck & Black (2009, A&A, 503, 323), which contains a detailed description of how the shielding functions presented below were derived and how they should be used. If you publish anything based on these data, please be sure to cite properly:

Visser, R., van Dishoeck, E.F., & Black, J.H. 2009, Astronomy & Astrophysics, 503, 323 [abstract, full-text PDF]

Shielding functions are available here for several sets of parameters. Doppler widths are given as 2-sigma widths.

[Download all shielding functions as an archive.]

1. Individual filenames in this archive are encoded according to: shield.A.B.C-D-E.dat. Where, A is the CO linewidth, B is the CO excitation temperature, and C, D and E/10 are the ¹²C/¹³C, ¹⁶O/¹⁸O, and ¹⁸C/¹⁷C ratios, respectively.
2. Each file contains shielding functions in grid forms for various ^xC^yO species. Each grid spans a range of shielding column densities of ¹²C¹⁶O and H₂. These ranges are listed before the grid arrays.