Orion HST

Information about Cloudy

The Cloudy software package

The main Cloudy web site is http://trac.nublado.org/ It has instructions for how to download the code and its data, and how to build a working executable. You will need to have access to a working version of the code.

The remainder of this page gives addiitional information. The code lives in a subversion (usually called "svn") source code control system repository. The svn software is described here: http://en.wikipedia.org/wiki/Subversion_(software)

You can view the Cloudy svn repository here:

The Cloudy user group web site is
is a place where users can ask questions.

Community use of Cloudy

I ask that users cite Cloudy's documentation when the code is used in a publication. Today about 250 papers cite Cloudy each year. These ADS citations are one way to masure the code's use. There have been four main references over the years and all together these have roughly 3400 citations.

Originally, I askd that users cite Hazy, the documentation included in the code's download. This link gives links to the roughly 1100 papers that cited Hazy.

Later, I asked that users cite Ferland et al. (1998), a review article published in PASP. This link produces a rank-ordered list of the most highly cited ADS astronomy research papers published in 1998. In mid-2017 it had roughly 1800 citations and was the 7th most cited paper. (The following Astronomy research journals are included in this ranking: ApJ, ApJL, ApJS, A&A, AJ, MNRAS, PASP, Rev Mex.)

The 2013 release, called C13, is described by Ferland et al. (2013). This link produces a rank-ordered list of the most highly cited ADS papers published in 2013. In mid 2017 this paper had roughly 460 citations and was the 11th most cited paper.

The 2017 release, called C17, is described by Ferland et al. (2017).

Astrophysical applications of Cloudy

Osterbrock & Ferland 2006, Astrophysics of Gaseous Nebulae and Active Galactic Nuclei, 2nd edition (AGN3). This is a graduate text that covers emission lines in nebulae and Active Nuclei.

Ferland 2003, ARA&A, 41, 517, Quantitative Spectroscopy of Photoionized Clouds A review of the status of the field and the outstanding research problems.

Hamann & Ferland, ARA&A, 37, 487, Elemental Abundances in Quasistellar Objects: Star Formation and Galactic Nuclear Evolution at High Redshifts. This applies Cloudy to measure abundances from the strong lines seen in Active Nuclei and finds a luminosity - metallicity correlation.

Ferland 2001, PASP, 113, 41, Physical Conditions in the Orion H II Region A review of the current status and problems for the Orion Nebula, the brightest and nearest H II region.