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The specific star formation rate function at different mass scales and quenching: A comparison between cosmological models and SDSS | | Antonios Katsianis
; Haojie Xu
; Xiaohu Yang
; Yu Luo
; Weiguang Cui
; Romeel Davé
; Claudia Del P. Lagos
; Xianzhong Zheng
; Ping Zhao
; | | Date: |
16 Oct 2020 | | Abstract: | We present the eddington bias corrected Specific Star Formation Rate Function
(sSFRF) at different stellar mass scales from a sub-sample of the Sloan Digital
Sky Survey Data Release DR7 (SDSS), which is considered complete both in terms
of stellar mass (${
m M_{star}}$) and star formation rate (SFR). The above
enable us to study qualitatively and quantitatively quenching, the distribution
of passive/star-forming galaxies and perform comparisons with the predictions
from state-of-the-art cosmological models, within the same ${
m M_{star}}$
and SFR limits. We find that at the low mass end (${
m M_{star}} = 10^{9.5} -
10^{10} , {
m M_{odot}}$) the sSFRF is mostly dominated by star-forming
objects. However, moving to the two more massive bins (${
m M_{star}} =
10^{10} - 10^{10.5} , {
m M_{odot}}$ and ${
m M_{star}} = 10^{10.5} -
10^{11} , {
m M_{odot}}$) a bi-modality with two peaks emerges. One peak
represents the star-forming population, while the other describes a rising
passive population. The bi-modal form of the sSFRFs is not reproduced by a
range of cosmological simulations (e.g. Illustris, EAGLE, Mufasa, IllustrisTNG)
which instead generate mostly the star-forming population, while a bi-modality
emerges in others (e.g. L-Galaxies, Shark, Simba). Our findings reflect the
need for the employed quenching schemes in state-of-the-art models to be
reconsidered, involving prescriptions that allow "quenched galaxies" to retain
a small level of SF activity (sSFR $=$ ${
m 10^{-11} {
m yr^{-1}}}$-${
m
10^{-12} {
m yr^{-1}}}$) and generate an adequate passive
population/bi-modality even at intermediate masses (${
m M_{star}} = 10^{10}
- 10^{10.5} , {
m M_{odot}}$). | | Source: | arXiv, 2010.08173 | | Services: | Forum | Review | PDF | Favorites | |
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