Physical drivers of galaxies' cold-gas content: exploring environmental and evolutionary effects with DARK SAGE

Adam R. H. Stevens, Toby Brown

Research output: Contribution to journalArticle

Abstract

We combine the latest spectrally stacked data of 21-cm emission from the Arecibo Legacy Fast ALFA survey with an updated version of the DARK SAGE semi-analytic model to investigate the relative contributions of secular and environmental astrophysical processes on shaping the HI fractions and quiescence of galaxies in the local Universe. We calibrate the model to match the observed mean HI fraction of all galaxies as a function of stellar mass. Without consideration of stellar feedback, disc instabilities and active galactic nuclei, we show how the slope and normalization of this relation would change significantly. We find DARK SAGE can reproduce the relative impact that halo mass is observed to have on satellites' HI fractions and quiescent fraction. However, the model satellites are systematically gas-poor. We discuss how this could be affected by satellite-central cross-contamination from the group-finding algorithm applied to the observed galaxies, but that it is not the full story. From our results, we suggest the anticorrelation between satellites' HI fractions and host halo mass, seen at fixed stellar mass and fixed specific star formation rate, can be attributed almost entirely to ram-pressure stripping of cold gas. Meanwhile, stripping of hot gas from around the satellites drives the correlation of quiescent fraction with halo mass at fixed stellar mass. Further detail in the modelling of galaxy discs' centres is required to solidify this result, however. We contextualize our results with those from other semi-analytic models and hydrodynamic simulations.

LanguageEnglish
Pages447-462
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume471
Issue number1
DOIs
StatePublished - Oct 2017

Cite this

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title = "Physical drivers of galaxies' cold-gas content: exploring environmental and evolutionary effects with DARK SAGE",
abstract = "We combine the latest spectrally stacked data of 21-cm emission from the Arecibo Legacy Fast ALFA survey with an updated version of the DARK SAGE semi-analytic model to investigate the relative contributions of secular and environmental astrophysical processes on shaping the HI fractions and quiescence of galaxies in the local Universe. We calibrate the model to match the observed mean HI fraction of all galaxies as a function of stellar mass. Without consideration of stellar feedback, disc instabilities and active galactic nuclei, we show how the slope and normalization of this relation would change significantly. We find DARK SAGE can reproduce the relative impact that halo mass is observed to have on satellites' HI fractions and quiescent fraction. However, the model satellites are systematically gas-poor. We discuss how this could be affected by satellite-central cross-contamination from the group-finding algorithm applied to the observed galaxies, but that it is not the full story. From our results, we suggest the anticorrelation between satellites' HI fractions and host halo mass, seen at fixed stellar mass and fixed specific star formation rate, can be attributed almost entirely to ram-pressure stripping of cold gas. Meanwhile, stripping of hot gas from around the satellites drives the correlation of quiescent fraction with halo mass at fixed stellar mass. Further detail in the modelling of galaxy discs' centres is required to solidify this result, however. We contextualize our results with those from other semi-analytic models and hydrodynamic simulations.",
keywords = "galaxies: evolution, galaxies: haloes, galaxies: interactions, galaxies: ISM-galaxies: star formation, TO-MOLECULAR TRANSITION, STAR-FORMING GALAXIES, ACTIVE GALACTIC NUCLEI, INITIAL MASS FUNCTION, IRAM LEGACY SURVEY, DIGITAL SKY SURVEY, HI DATA STACKING, RAM-PRESSURE, SCALING RELATIONS, ANGULAR-MOMENTUM",
author = "Stevens, {Adam R. H.} and Toby Brown",
year = "2017",
month = "10",
doi = "10.1093/mnras/stx1596",
language = "English",
volume = "471",
pages = "447--462",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "OXFORD UNIV PRESS UNITED KINGDOM",
number = "1",

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TY - JOUR

T1 - Physical drivers of galaxies' cold-gas content

T2 - Monthly Notices of the Royal Astronomical Society

AU - Stevens,Adam R. H.

AU - Brown,Toby

PY - 2017/10

Y1 - 2017/10

N2 - We combine the latest spectrally stacked data of 21-cm emission from the Arecibo Legacy Fast ALFA survey with an updated version of the DARK SAGE semi-analytic model to investigate the relative contributions of secular and environmental astrophysical processes on shaping the HI fractions and quiescence of galaxies in the local Universe. We calibrate the model to match the observed mean HI fraction of all galaxies as a function of stellar mass. Without consideration of stellar feedback, disc instabilities and active galactic nuclei, we show how the slope and normalization of this relation would change significantly. We find DARK SAGE can reproduce the relative impact that halo mass is observed to have on satellites' HI fractions and quiescent fraction. However, the model satellites are systematically gas-poor. We discuss how this could be affected by satellite-central cross-contamination from the group-finding algorithm applied to the observed galaxies, but that it is not the full story. From our results, we suggest the anticorrelation between satellites' HI fractions and host halo mass, seen at fixed stellar mass and fixed specific star formation rate, can be attributed almost entirely to ram-pressure stripping of cold gas. Meanwhile, stripping of hot gas from around the satellites drives the correlation of quiescent fraction with halo mass at fixed stellar mass. Further detail in the modelling of galaxy discs' centres is required to solidify this result, however. We contextualize our results with those from other semi-analytic models and hydrodynamic simulations.

AB - We combine the latest spectrally stacked data of 21-cm emission from the Arecibo Legacy Fast ALFA survey with an updated version of the DARK SAGE semi-analytic model to investigate the relative contributions of secular and environmental astrophysical processes on shaping the HI fractions and quiescence of galaxies in the local Universe. We calibrate the model to match the observed mean HI fraction of all galaxies as a function of stellar mass. Without consideration of stellar feedback, disc instabilities and active galactic nuclei, we show how the slope and normalization of this relation would change significantly. We find DARK SAGE can reproduce the relative impact that halo mass is observed to have on satellites' HI fractions and quiescent fraction. However, the model satellites are systematically gas-poor. We discuss how this could be affected by satellite-central cross-contamination from the group-finding algorithm applied to the observed galaxies, but that it is not the full story. From our results, we suggest the anticorrelation between satellites' HI fractions and host halo mass, seen at fixed stellar mass and fixed specific star formation rate, can be attributed almost entirely to ram-pressure stripping of cold gas. Meanwhile, stripping of hot gas from around the satellites drives the correlation of quiescent fraction with halo mass at fixed stellar mass. Further detail in the modelling of galaxy discs' centres is required to solidify this result, however. We contextualize our results with those from other semi-analytic models and hydrodynamic simulations.

KW - galaxies: evolution

KW - galaxies: haloes

KW - galaxies: interactions

KW - galaxies: ISM-galaxies: star formation

KW - TO-MOLECULAR TRANSITION

KW - STAR-FORMING GALAXIES

KW - ACTIVE GALACTIC NUCLEI

KW - INITIAL MASS FUNCTION

KW - IRAM LEGACY SURVEY

KW - DIGITAL SKY SURVEY

KW - HI DATA STACKING

KW - RAM-PRESSURE

KW - SCALING RELATIONS

KW - ANGULAR-MOMENTUM

U2 - 10.1093/mnras/stx1596

DO - 10.1093/mnras/stx1596

M3 - Article

VL - 471

SP - 447

EP - 462

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -