Observational Evidence for Large-scale Gas Heating in a Galaxy Protocluster at z = 2.30

We report a z = 2.30 galaxy protocluster (COSTCO-I) in the COSMOS field, where the Ly α forest as seen in the CLAMATO IGM tomography survey does not show significant absorption. This departs from the transmission–density relationship (often dubbed the fluctuating Gunn–Peterson approximation; FGPA) u...
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Autor*in:	Chenze Dong [verfasserIn] Khee-Gan Lee [verfasserIn] Metin Ata [verfasserIn] Benjamin Horowitz [verfasserIn] Rieko Momose [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	Intergalactic medium Quasar absorption line spectroscopy High-redshift galaxy clusters N-body simulations Intracluster medium

Übergeordnetes Werk:	In: The Astrophysical Journal Letters - IOP Publishing, 2022, 945(2023), 2, p L28
Übergeordnetes Werk:	volume:945 ; year:2023 ; number:2, p L28

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3847/2041-8213/acba89

Katalog-ID:	DOAJ089155408

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callnumber-first	Q - Science
author	Chenze Dong
spellingShingle	Chenze Dong misc QB460-466 misc Intergalactic medium misc Quasar absorption line spectroscopy misc High-redshift galaxy clusters misc N-body simulations misc Intracluster medium misc Astrophysics Observational Evidence for Large-scale Gas Heating in a Galaxy Protocluster at z = 2.30
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topic_title	QB460-466 Observational Evidence for Large-scale Gas Heating in a Galaxy Protocluster at z = 2.30 Intergalactic medium Quasar absorption line spectroscopy High-redshift galaxy clusters N-body simulations Intracluster medium
topic	misc QB460-466 misc Intergalactic medium misc Quasar absorption line spectroscopy misc High-redshift galaxy clusters misc N-body simulations misc Intracluster medium misc Astrophysics
topic_unstemmed	misc QB460-466 misc Intergalactic medium misc Quasar absorption line spectroscopy misc High-redshift galaxy clusters misc N-body simulations misc Intracluster medium misc Astrophysics
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title	Observational Evidence for Large-scale Gas Heating in a Galaxy Protocluster at z = 2.30
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title_full	Observational Evidence for Large-scale Gas Heating in a Galaxy Protocluster at z = 2.30
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title_sort	observational evidence for large-scale gas heating in a galaxy protocluster at z = 2.30
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title_auth	Observational Evidence for Large-scale Gas Heating in a Galaxy Protocluster at z = 2.30
abstract	We report a z = 2.30 galaxy protocluster (COSTCO-I) in the COSMOS field, where the Ly α forest as seen in the CLAMATO IGM tomography survey does not show significant absorption. This departs from the transmission–density relationship (often dubbed the fluctuating Gunn–Peterson approximation; FGPA) usually expected to hold at this epoch, which would lead one to predict strong Ly α absorption at the overdensity. For comparison, we generate mock Ly α forest maps by applying the FGPA to constrained simulations of the COSMOS density field and create mocks that incorporate the effects of finite sight-line sampling, pixel noise, and Wiener filtering. Averaged over r = 15 h ^−1 Mpc around the protocluster, the observed Ly α forest is consistently more transparent in the real data than in the mocks, indicating a rejection of the null hypothesis that the gas in COSTCO-I follows the FGPA ( p = 0.0026, or 2.79 σ significance). It suggests that the large-scale gas associated with COSTCO-I is being heated above the expectations of the FGPA, which might be due to either large-scale AGN jet feedback or early gravitational shock heating. COSTCO-I is the first known large-scale region of the IGM that is observed to be transitioning from the optically thin photoionized regime at cosmic noon to eventually coalesce into an intracluster medium (ICM) by z = 0. Future observations of similar structures will shed light on the growth of the ICM and allow constraints on AGN feedback mechanisms.
abstractGer	We report a z = 2.30 galaxy protocluster (COSTCO-I) in the COSMOS field, where the Ly α forest as seen in the CLAMATO IGM tomography survey does not show significant absorption. This departs from the transmission–density relationship (often dubbed the fluctuating Gunn–Peterson approximation; FGPA) usually expected to hold at this epoch, which would lead one to predict strong Ly α absorption at the overdensity. For comparison, we generate mock Ly α forest maps by applying the FGPA to constrained simulations of the COSMOS density field and create mocks that incorporate the effects of finite sight-line sampling, pixel noise, and Wiener filtering. Averaged over r = 15 h ^−1 Mpc around the protocluster, the observed Ly α forest is consistently more transparent in the real data than in the mocks, indicating a rejection of the null hypothesis that the gas in COSTCO-I follows the FGPA ( p = 0.0026, or 2.79 σ significance). It suggests that the large-scale gas associated with COSTCO-I is being heated above the expectations of the FGPA, which might be due to either large-scale AGN jet feedback or early gravitational shock heating. COSTCO-I is the first known large-scale region of the IGM that is observed to be transitioning from the optically thin photoionized regime at cosmic noon to eventually coalesce into an intracluster medium (ICM) by z = 0. Future observations of similar structures will shed light on the growth of the ICM and allow constraints on AGN feedback mechanisms.
abstract_unstemmed	We report a z = 2.30 galaxy protocluster (COSTCO-I) in the COSMOS field, where the Ly α forest as seen in the CLAMATO IGM tomography survey does not show significant absorption. This departs from the transmission–density relationship (often dubbed the fluctuating Gunn–Peterson approximation; FGPA) usually expected to hold at this epoch, which would lead one to predict strong Ly α absorption at the overdensity. For comparison, we generate mock Ly α forest maps by applying the FGPA to constrained simulations of the COSMOS density field and create mocks that incorporate the effects of finite sight-line sampling, pixel noise, and Wiener filtering. Averaged over r = 15 h ^−1 Mpc around the protocluster, the observed Ly α forest is consistently more transparent in the real data than in the mocks, indicating a rejection of the null hypothesis that the gas in COSTCO-I follows the FGPA ( p = 0.0026, or 2.79 σ significance). It suggests that the large-scale gas associated with COSTCO-I is being heated above the expectations of the FGPA, which might be due to either large-scale AGN jet feedback or early gravitational shock heating. COSTCO-I is the first known large-scale region of the IGM that is observed to be transitioning from the optically thin photoionized regime at cosmic noon to eventually coalesce into an intracluster medium (ICM) by z = 0. Future observations of similar structures will shed light on the growth of the ICM and allow constraints on AGN feedback mechanisms.
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title_short	Observational Evidence for Large-scale Gas Heating in a Galaxy Protocluster at z = 2.30
url	https://doi.org/10.3847/2041-8213/acba89 https://doaj.org/article/b90386013d8d43a9a3ede40f4311f788 https://doaj.org/toc/2041-8205
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Observational Evidence for Large-scale Gas Heating in a Galaxy Protocluster at z = 2.30

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