Quenching of star formation from a lack of inflowing gas to galaxies

REQUIEM-2D: A diversity of formation pathways in a sample of spatially-resolved massive quiescent galaxies at z~2

“…In both sources, the dust emission is unresolved in the ∼1-1. 5 ALMA data (Whitaker et al 2021). While this resolution is significantly coarser than our spatially resolved bins, the fact that the emission is pointlike implies that there is some information about the spatial distribution of the 1.3 mm flux in the existing data.…”

“…Spectrophotometric observations, that include UV to far IR data, are extensively used to study quiescent galaxies at z 1 (e.g., Geier et al 2013;Hill et al 2016;Belli et al 2017;Toft et al 2017;Abramson et al 2018;Ebeling et al 2018;Newman et al 2018;Morishita et al 2018Morishita et al , 2019Belli et al 2019Belli et al , 2021Estrada-Carpenter et al 2019Jafariyazani et al 2020;Setton et al 2020;Man et al 2021;Tacchella et al 2021;Whitaker et al 2013Whitaker et al , 2021. These studies imply a diversity among the progenitors, including compact galaxies that form stars centrally (e.g., Williams et al 2014) and rotationally supported larger star-forming galaxies (e.g., Wisnioski et al 2015).…”

“…Quiescent galaxies are thought to form via either "slow" or "fast" channels, leading to different colors, formation time-scales and the ages of the stellar populations (e.g., Belli et al 2019). The cold gas content of quiescent galaxies has also been studied to some extent, revealing a medley of values for the inferred depletion timescales and gas to stellar-mass ratios (e.g., Belli et al 2021;Bezanson et al 2019;Man et al 2021;Spilker et al 2018;Suess et al 2017;Whitaker et al 2021;Williams et al 2021). These early studies find cases that support both fast depletion of the cold gas and/or reduced star-formation efficiency associated with the quiescent population.…”

Models That Link and Suggest Data about Elementary Particles, Dark Matter, and the Cosmos

“…People report the notion that some galaxies seem to stop forming stars. (See reference [64] and reference [65].) Such so-called quenching might take place within three billion years after the big Bang, might associate with a relative lack of hydrogen atoms, and might pertain to half of a certain type of galaxy.…”

“…Such so-called quenching might take place within three billion years after the big Bang, might associate with a relative lack of hydrogen atoms, and might pertain to half of a certain type of galaxy. (See reference [65].) Reference [66] discusses a galaxy that seems to have stopped accruing both ordinary matter and dark matter about four billion years after the Big Bang.…”