The shape of dark matter haloes - II. The GALACTUS H I modelling & fitting tool

S. P. C. Peters, P. C. van der Kruit, R. J. Allen, K. C. Freeman

OnderzoeksoutputAcademicpeer review

4 Citaten (Scopus)
185 Downloads (Pure)


We present a new H I modelling tool called GALACTUS. The program has been designed to perform automated fits of disc-galaxy models to observations. It includes a treatment for the self-absorption of gas. The software has been released into the public domain. We describe the design philosophy and inner workings of the program. After this, we model the face-on galaxy NGC 2403 using both self-absorption and optically thin models, showing that self-absorption occurs even in face-on galaxies. These results are then used to model an edge-on galaxy. It is shown that the maximum surface brightness plateaus seen in Paper I of this series are indeed signs of self-absorption. The apparent H I mass of an edge-on galaxy can be drastically lower compared with that same galaxy seen face-on. The Tully-Fisher relation is found to be relatively free from self-absorption issues.
Originele taal-2English
Pagina's (van-tot)21-31
Aantal pagina's11
TijdschriftMonthly Notices of the Royal Astronomical Society
Nummer van het tijdschrift1
StatusPublished - jan-2017

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