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

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

doi:10.1093/mnras/stw2099

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

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We present a new HI 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 HI 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.

Original language	English
Pages (from-to)	21-31
Number of pages	11
Journal	Monthly Notices of the Royal Astronomical Society
Volume	464
Issue number	1
DOIs	https://doi.org/10.1093/mnras/stw2099
Publication status	Published - 1 Jan 2017

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title = "The shape of dark matter haloes - II. The GALACTUS HI modelling & fitting tool",

abstract = "We present a new HI 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 HI 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.",

keywords = "Galaxies: haloes, Galaxies: kinematics and dynamics, Galaxies: photometry, Galaxies: spiral, Galaxies: structure",

author = "Peters, {S. P.C.} and {van der Kruit}, {P. C.} and Allen, {R. J.} and Freeman, {K. C.}",

note = "Publisher Copyright: {\textcopyright} 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.",

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doi = "10.1093/mnras/stw2099",

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T1 - The shape of dark matter haloes - II. The GALACTUS HI modelling & fitting tool

AU - Peters, S. P.C.

AU - van der Kruit, P. C.

AU - Allen, R. J.

AU - Freeman, K. C.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - We present a new HI 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 HI 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.

AB - We present a new HI 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 HI 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.

KW - Galaxies: haloes

KW - Galaxies: kinematics and dynamics

KW - Galaxies: photometry

KW - Galaxies: spiral

KW - Galaxies: structure

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U2 - 10.1093/mnras/stw2099

DO - 10.1093/mnras/stw2099

M3 - Article

SN - 0035-8711

VL - 464

SP - 21

EP - 31

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

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

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