Do galaxies die? Different views from simulations and observations in the Local Universe

Do galaxies die? Different views from simulations and observations in the Local Universe. Corcho-Caballero, P., Ascasibar, Y., & Scannapieco, C. arXiv e-prints, 2105:arXiv:2105.05298, May, 2021.

Paper abstract bibtex

For years, the extragalactic community has divided galaxies in two distinct populations. One of them, featuring blue colours, is actively forming stars, while the other is made up of "red-and-dead" objects with negligible star formation. Yet, are these galaxies really dead? Here we would like to highlight that, as previously reported by several independent groups, state-of-the-art cosmological numerical simulations predict the existence of a large number of quenched galaxies that have not formed any star over the last few Gyr. In contrast, observational measurements of large galaxy samples in the nearby Universe suggest that even the most passive systems still form stars at some residual level close to \$sSFR{\textbackslash}sim10{\textasciicircum}\{-12\}{\textasciitilde}{\textbackslash}text\{yr\}{\textasciicircum}\{-1\}\$. Unfortunately, extremely low star formation poses a challenge for both approaches. We conclude that, at present, the fraction of truly dead galaxies is still an important open question that must be addressed in order to understand galaxy formation and evolution.

@article{corcho-caballero_galaxies_2021,
	title = {Do galaxies die? {Different} views from simulations and observations in the {Local} {Universe}},
	volume = {2105},
	shorttitle = {Do galaxies die?},
	url = {http://adsabs.harvard.edu/abs/2021arXiv210505298C},
	abstract = {For years, the extragalactic community has divided galaxies in two 
distinct populations. One of them, featuring blue colours, is actively
forming stars, while the other is made up of "red-and-dead" objects with
negligible star formation. Yet, are these galaxies really dead? Here we
would like to highlight that, as previously reported by several
independent groups, state-of-the-art cosmological numerical simulations
predict the existence of a large number of quenched galaxies that have
not formed any star over the last few Gyr. In contrast, observational
measurements of large galaxy samples in the nearby Universe suggest that
even the most passive systems still form stars at some residual level
close to \$sSFR{\textbackslash}sim10{\textasciicircum}\{-12\}{\textasciitilde}{\textbackslash}text\{yr\}{\textasciicircum}\{-1\}\$. Unfortunately, extremely low
star formation poses a challenge for both approaches. We conclude that,
at present, the fraction of truly dead galaxies is still an important
open question that must be addressed in order to understand galaxy
formation and evolution.},
	urldate = {2021-05-16},
	journal = {arXiv e-prints},
	author = {Corcho-Caballero, Pablo and Ascasibar, Yago and Scannapieco, Cecilia},
	month = may,
	year = {2021},
	keywords = {Astrophysics - Astrophysics of Galaxies},
	pages = {arXiv:2105.05298},
}

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