Forming the local starburst galaxy Haro 11 through hydrodynamical merger simulations
(2025) In Monthly Notices of the Royal Astronomical Society 543(4). p.3849-3866- Abstract
Haro 11 is a metal-poor, starburst galaxy believed to be the result of an ongoing merger, which is shaping the properties of the galaxy. In this study, we carry out a large suite of numerical simulations of a merger between two disc galaxies, to study possible origins of Haro 11 and understand under which conditions various features of the galaxy are formed. By varying galaxy parameters describing the orbital configurations, masses, and their inclination, we perform a total of ∼500 simulations. We demonstrate that a two-disc galaxy merger reproduces key, observed features of Haro 11, including its morphology, gas kinematics, star formation history, and stellar population ages and masses. In particular, we present a fiducial Haro 11... (More)
Haro 11 is a metal-poor, starburst galaxy believed to be the result of an ongoing merger, which is shaping the properties of the galaxy. In this study, we carry out a large suite of numerical simulations of a merger between two disc galaxies, to study possible origins of Haro 11 and understand under which conditions various features of the galaxy are formed. By varying galaxy parameters describing the orbital configurations, masses, and their inclination, we perform a total of ∼500 simulations. We demonstrate that a two-disc galaxy merger reproduces key, observed features of Haro 11, including its morphology, gas kinematics, star formation history, and stellar population ages and masses. In particular, we present a fiducial Haro 11 model that produces the single observed tidal tail, three stellar knots, and inner gas morphology and kinematics. The resulting orbit and galactic morphology are robust against small variations of the initial parameters. By performing mock observations, we compare with the results of observational data and discuss possible origins for various features. Furthermore, we present newly gathered observational data that confirms the presence of a stellar tidal tail with similar length and morphology as our simulations.
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- author
- Ejdetjärn, Timmy LU ; Agertz, Oscar LU ; Renaud, Florent LU ; Östlin, Göran ; Le Reste, Alexandra and Adamo, Angela
- organization
- publishing date
- 2025-11-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- galaxies: evolution, galaxies: individual (Haro 11), galaxies: interactions, galaxies: starburst, methods: numerical
- in
- Monthly Notices of the Royal Astronomical Society
- volume
- 543
- issue
- 4
- pages
- 18 pages
- publisher
- Oxford University Press
- external identifiers
-
- scopus:105019738371
- ISSN
- 0035-8711
- DOI
- 10.1093/mnras/staf1733
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © The Author(s) 2025. Published by Oxford University Press on behalf of Royal Astronomical Society.
- id
- 3208549d-027c-4b3a-8910-5898c4ab44b6
- date added to LUP
- 2025-12-16 10:55:42
- date last changed
- 2025-12-16 10:56:52
@article{3208549d-027c-4b3a-8910-5898c4ab44b6,
abstract = {{<p>Haro 11 is a metal-poor, starburst galaxy believed to be the result of an ongoing merger, which is shaping the properties of the galaxy. In this study, we carry out a large suite of numerical simulations of a merger between two disc galaxies, to study possible origins of Haro 11 and understand under which conditions various features of the galaxy are formed. By varying galaxy parameters describing the orbital configurations, masses, and their inclination, we perform a total of ∼500 simulations. We demonstrate that a two-disc galaxy merger reproduces key, observed features of Haro 11, including its morphology, gas kinematics, star formation history, and stellar population ages and masses. In particular, we present a fiducial Haro 11 model that produces the single observed tidal tail, three stellar knots, and inner gas morphology and kinematics. The resulting orbit and galactic morphology are robust against small variations of the initial parameters. By performing mock observations, we compare with the results of observational data and discuss possible origins for various features. Furthermore, we present newly gathered observational data that confirms the presence of a stellar tidal tail with similar length and morphology as our simulations.</p>}},
author = {{Ejdetjärn, Timmy and Agertz, Oscar and Renaud, Florent and Östlin, Göran and Le Reste, Alexandra and Adamo, Angela}},
issn = {{0035-8711}},
keywords = {{galaxies: evolution; galaxies: individual (Haro 11); galaxies: interactions; galaxies: starburst; methods: numerical}},
language = {{eng}},
month = {{11}},
number = {{4}},
pages = {{3849--3866}},
publisher = {{Oxford University Press}},
series = {{Monthly Notices of the Royal Astronomical Society}},
title = {{Forming the local starburst galaxy Haro 11 through hydrodynamical merger simulations}},
url = {{http://dx.doi.org/10.1093/mnras/staf1733}},
doi = {{10.1093/mnras/staf1733}},
volume = {{543}},
year = {{2025}},
}