Interacting galaxies in the IllustrisTNG simulations – V. Comparing the influence of star-forming versus passive companions
Abstract
ABSTRACT We study interacting galaxy pairs in the TNG100-1 and TNG300-1 cosmological simulations using previously generated closest companion samples. We study the specific star-formation rates (sSFRs) of massive ($$10^{10} \, {\rm M}_{\odot } \lt M_* \lt 10^{12} \, {\rm M}_{\odot }$$ ) galaxies at z ≤ 0.2 as a function of separation from the closest companion galaxy. We split our sample based on whether the companion galaxy is star-forming or passive. We find that galaxies with close star-forming companions have sSFRs that are enhanced (on average) by a factor of 2.9 ± 0.3 in TNG100-1 and 2.27 ± 0.06 in TNG300-1 compared to controls, with enhancements present out to separations of ∼300 kpc. Galaxies with passive companions in TNG300-1 exhibit mild sSFR suppression (∼12 per cent) at 100–300 kpc and small sSFR enhancements at separations below 50 kpc. sSFR suppression is strongest in pairs where the galaxy’s stellar mass is more than 2 times that of its passive companion. By generating a stellar mass-matched (‘twinned’) sample in TNG300-1, we show that differences in sSFR trends between companion types are not a result of intrinsic stellar mass differences in star-forming versus passive galaxies. We compare with an analogous sample of galaxy pairs from SDSS, finding consistent results between observations and simulations. Overall, we find that star-forming galaxies show enhanced sSFRs regardless of companion type, but that galaxies with close passive companions are more likely to be passive themselves.
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1973539
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 522 Journal Issue: 4; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Brown, Westley, Patton, David R., Ellison, Sara L., and Faria, Lawrence. Interacting galaxies in the IllustrisTNG simulations – V. Comparing the influence of star-forming versus passive companions. United Kingdom: N. p., 2023.
Web. doi:10.1093/mnras/stad1314.
Brown, Westley, Patton, David R., Ellison, Sara L., & Faria, Lawrence. Interacting galaxies in the IllustrisTNG simulations – V. Comparing the influence of star-forming versus passive companions. United Kingdom. https://doi.org/10.1093/mnras/stad1314
Brown, Westley, Patton, David R., Ellison, Sara L., and Faria, Lawrence. Thu .
"Interacting galaxies in the IllustrisTNG simulations – V. Comparing the influence of star-forming versus passive companions". United Kingdom. https://doi.org/10.1093/mnras/stad1314.
@article{osti_1973539,
title = {Interacting galaxies in the IllustrisTNG simulations – V. Comparing the influence of star-forming versus passive companions},
author = {Brown, Westley and Patton, David R. and Ellison, Sara L. and Faria, Lawrence},
abstractNote = {ABSTRACT We study interacting galaxy pairs in the TNG100-1 and TNG300-1 cosmological simulations using previously generated closest companion samples. We study the specific star-formation rates (sSFRs) of massive ($10^{10} \, {\rm M}_{\odot } \lt M_* \lt 10^{12} \, {\rm M}_{\odot }$ ) galaxies at z ≤ 0.2 as a function of separation from the closest companion galaxy. We split our sample based on whether the companion galaxy is star-forming or passive. We find that galaxies with close star-forming companions have sSFRs that are enhanced (on average) by a factor of 2.9 ± 0.3 in TNG100-1 and 2.27 ± 0.06 in TNG300-1 compared to controls, with enhancements present out to separations of ∼300 kpc. Galaxies with passive companions in TNG300-1 exhibit mild sSFR suppression (∼12 per cent) at 100–300 kpc and small sSFR enhancements at separations below 50 kpc. sSFR suppression is strongest in pairs where the galaxy’s stellar mass is more than 2 times that of its passive companion. By generating a stellar mass-matched (‘twinned’) sample in TNG300-1, we show that differences in sSFR trends between companion types are not a result of intrinsic stellar mass differences in star-forming versus passive galaxies. We compare with an analogous sample of galaxy pairs from SDSS, finding consistent results between observations and simulations. Overall, we find that star-forming galaxies show enhanced sSFRs regardless of companion type, but that galaxies with close passive companions are more likely to be passive themselves.},
doi = {10.1093/mnras/stad1314},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 4,
volume = 522,
place = {United Kingdom},
year = {Thu May 04 00:00:00 EDT 2023},
month = {Thu May 04 00:00:00 EDT 2023}
}
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