The merger-starburst connection across cosmic times
(2022) In Monthly Notices of the Royal Astronomical Society 516(4). p.4922-4931- Abstract
The correspondence between galaxy major mergers and starburst activity is well established observationally and in simulations of low-redshift galaxies. However, the evolution of the properties of interactions and of the galaxies involved suggests that the starburst response of galaxies to merger events could vary across cosmic time. Using the vintergatan cosmological zoom-in simulation of a Milky Way-like galaxy, we show here that starbursts, i.e. episodes of fast star formation, are connected with the onset of tidal compression, itself induced by mergers. However, this compression becomes strong enough to trigger starbursts only after the formation of the galactic disc. As a consequence, starburst episodes are only found during a... (More)
The correspondence between galaxy major mergers and starburst activity is well established observationally and in simulations of low-redshift galaxies. However, the evolution of the properties of interactions and of the galaxies involved suggests that the starburst response of galaxies to merger events could vary across cosmic time. Using the vintergatan cosmological zoom-in simulation of a Milky Way-like galaxy, we show here that starbursts, i.e. episodes of fast star formation, are connected with the onset of tidal compression, itself induced by mergers. However, this compression becomes strong enough to trigger starbursts only after the formation of the galactic disc. As a consequence, starburst episodes are only found during a precise phase of galaxy evolution, after the formation of the disc and until the last major merger. As the depletion time quantifies the instantaneous star formation activity, while the specific star formation rate involves the integrated result of the past activity (via the stellar mass), starburst episodes do not necessarily coincide with elevated specific star formation rate. This suggests that not all starburst galaxies are outliers above the main sequence of galaxy formation.ok
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- author
- Renaud, Florent LU ; Segovia Otero, Alvaro LU and Agertz, Oscar LU
- organization
- publishing date
- 2022-11-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- galaxies: interactions, galaxies: starburst, methods: numerical
- in
- Monthly Notices of the Royal Astronomical Society
- volume
- 516
- issue
- 4
- pages
- 10 pages
- publisher
- Oxford University Press
- external identifiers
-
- scopus:85142752782
- ISSN
- 0035-8711
- DOI
- 10.1093/mnras/stac2557
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2022 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
- id
- dd5773b8-f93c-45cd-b11b-1026e68be2d2
- date added to LUP
- 2026-07-02 15:48:05
- date last changed
- 2026-07-02 15:48:23
@article{dd5773b8-f93c-45cd-b11b-1026e68be2d2,
abstract = {{<p>The correspondence between galaxy major mergers and starburst activity is well established observationally and in simulations of low-redshift galaxies. However, the evolution of the properties of interactions and of the galaxies involved suggests that the starburst response of galaxies to merger events could vary across cosmic time. Using the vintergatan cosmological zoom-in simulation of a Milky Way-like galaxy, we show here that starbursts, i.e. episodes of fast star formation, are connected with the onset of tidal compression, itself induced by mergers. However, this compression becomes strong enough to trigger starbursts only after the formation of the galactic disc. As a consequence, starburst episodes are only found during a precise phase of galaxy evolution, after the formation of the disc and until the last major merger. As the depletion time quantifies the instantaneous star formation activity, while the specific star formation rate involves the integrated result of the past activity (via the stellar mass), starburst episodes do not necessarily coincide with elevated specific star formation rate. This suggests that not all starburst galaxies are outliers above the main sequence of galaxy formation.ok</p>}},
author = {{Renaud, Florent and Segovia Otero, Alvaro and Agertz, Oscar}},
issn = {{0035-8711}},
keywords = {{galaxies: interactions; galaxies: starburst; methods: numerical}},
language = {{eng}},
month = {{11}},
number = {{4}},
pages = {{4922--4931}},
publisher = {{Oxford University Press}},
series = {{Monthly Notices of the Royal Astronomical Society}},
title = {{The merger-starburst connection across cosmic times}},
url = {{http://dx.doi.org/10.1093/mnras/stac2557}},
doi = {{10.1093/mnras/stac2557}},
volume = {{516}},
year = {{2022}},
}