| | |
| | |
Stat |
Members: 3645 Articles: 2'502'364 Articles rated: 2609
23 April 2024 |
|
| | | |
|
Article overview
| |
|
The origins of post-starburst galaxies at z<0.05 | Milena M. Pawlik
; Layth Taj Aldeen
; Vivienne Wild
; Jairo Mendez-Abreu
; Natalia Lahén
; Peter H. Johansson
; Noelia Jimenez
; William Lucas
; Yirui Zheng
; C. Jakob Walcher
; Kate Rowlands
; | Date: |
6 Mar 2018 | Abstract: | Post-starburst galaxies can be identified via the presence of prominent
Hydrogen Balmer absorption lines in their spectra. We present a comprehensive
study of the origin of strong Balmer lines in a volume-limited sample of 189
galaxies with $0.01<z<0.05$, $log(mbox{M}_{star}/mbox{M}_{odot})>9.5$ and
projected axis ratio $b/a>0.32$. We explore their structural properties,
environments, emission lines and star formation histories, and compare them to
control samples of star-forming and quiescent galaxies, and simulated galaxy
mergers. Excluding contaminants, in which the strong Balmer lines are most
likely caused by dust-star geometry, we find evidence for three different
pathways through the post-starburst phase, with most events occurring in
intermediate-density environments: (1) a significant disruptive event, such as
a gas-rich major merger, causing a starburst and growth of a spheroidal
component, followed by quenching of the star formation (70% of post-starburst
galaxies at $9.5<log(mbox{M}_{star}/mbox{M}_{odot})<10.5$ and 60% at
$log(mbox{M}_{star}/mbox{M}_{odot})>10.5$); (2) at
$9.5<log(mbox{M}_{star}/mbox{M}_{odot})<10.5$, stochastic star formation
in blue-sequence galaxies, causing a weak burst and subsequent return to the
blue sequence (30%); (3) at $log(mbox{M}_{star}/mbox{M}_{odot})>10.5$,
cyclic evolution of quiescent galaxies which gradually move towards the
high-mass end of the red sequence through weak starbursts, possibly as a result
of a merger with a smaller gas-rich companion (40%). Our analysis suggests that
AGN are ’on’ for $50%$ of the duration of the post-starburst phase, meaning
that traditional samples of post-starburst galaxies with strict emission line
cuts will be at least $50%$ incomplete due to the exclusion of narrow-line AGN. | Source: | arXiv, 1803.2201 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |