TY - JOUR
T1 - Resonant scattering of the O VII X-ray emission line in the circumgalactic medium of TNG50 galaxies
AU - Nelson, Dylan
AU - Byrohl, Chris
AU - Ogorzalek, Anna
AU - Markevitch, Maxim
AU - Khabibullin, Ildar
AU - Churazov, Eugene
AU - Zhuravleva, Irina
AU - Bogdan, Akos
AU - Chakraborty, Priyanka
AU - Kilbourne, Caroline
AU - Kraft, Ralph
AU - Pillepich, Annalisa
AU - Sarkar, Arnab
AU - Schellenberger, Gerrit
AU - Su, Yuanyuan
AU - Truong, Nhut
AU - Vladutescu-Zopp, Stephan
AU - Wijers, Nastasha
N1 - Publisher Copyright:
© 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2023/7/1
Y1 - 2023/7/1
N2 - We study the impact of resonantly scattered X-ray line emission on the observability of the hot circumgalactic medium (CGM) of galaxies. We apply a Monte Carlo radiative transfer post-processing analysis to the high-resolution TNG50 cosmological magnetohydrodynamical galaxy formation simulation. This allows us to model the resonant scattering of O VII(r) X-ray photons within the complex, multiphase, multiscale CGM. The resonant transition of the O VII He-like triplet is one of the brightest, and most promising, X-ray emission lines for detecting the hot CGM and measuring its physical properties. We focus on galaxies with stellar masses 10.0 < log (M*/M☉) < 11.0 at z ≃ 0. After constructing a model for O VII(r) emission from the central galaxy, as well as from CGM gas, we forward model these intrinsic photons to derive observable surface brightness maps. We find that scattering significantly boosts the observable O VII(r) surface brightness of the extended and diffuse CGM. This enhancement can be large - an order of magnitude on average at a distance of 200 projected kpc for high-mass M* = 1010.7 M☉ galaxies. The enhancement is larger for lower mass galaxies and can even reach a factor of 100, across the extended CGM. Galaxies with higher star formation rates, AGN luminosities, and central O VII(r) luminosities all have larger scattering enhancements, at fixed stellar mass. Our results suggest that next-generation X-ray spectroscopic missions, including XRISM, LEM, ATHENA, and HUBS - which aim to detect the hot CGM in emission - could specifically target haloes with significant enhancements due to resonant scattering.
AB - We study the impact of resonantly scattered X-ray line emission on the observability of the hot circumgalactic medium (CGM) of galaxies. We apply a Monte Carlo radiative transfer post-processing analysis to the high-resolution TNG50 cosmological magnetohydrodynamical galaxy formation simulation. This allows us to model the resonant scattering of O VII(r) X-ray photons within the complex, multiphase, multiscale CGM. The resonant transition of the O VII He-like triplet is one of the brightest, and most promising, X-ray emission lines for detecting the hot CGM and measuring its physical properties. We focus on galaxies with stellar masses 10.0 < log (M*/M☉) < 11.0 at z ≃ 0. After constructing a model for O VII(r) emission from the central galaxy, as well as from CGM gas, we forward model these intrinsic photons to derive observable surface brightness maps. We find that scattering significantly boosts the observable O VII(r) surface brightness of the extended and diffuse CGM. This enhancement can be large - an order of magnitude on average at a distance of 200 projected kpc for high-mass M* = 1010.7 M☉ galaxies. The enhancement is larger for lower mass galaxies and can even reach a factor of 100, across the extended CGM. Galaxies with higher star formation rates, AGN luminosities, and central O VII(r) luminosities all have larger scattering enhancements, at fixed stellar mass. Our results suggest that next-generation X-ray spectroscopic missions, including XRISM, LEM, ATHENA, and HUBS - which aim to detect the hot CGM in emission - could specifically target haloes with significant enhancements due to resonant scattering.
KW - galaxies: clusters: general
KW - galaxies: evolution
KW - galaxies: formation
KW - galaxies: haloes
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U2 - 10.1093/mnras/stad1195
DO - 10.1093/mnras/stad1195
M3 - Article
AN - SCOPUS:85159774875
SN - 0035-8711
VL - 522
SP - 3665
EP - 3678
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -