Model Galaxy Formation in Quasar Proximity Zones during Reionization - - PowerPoint PPT Presentation

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Nov 29, 2023 118 likes •356 views

I use Blue Waters to Model Galaxy Formation in Quasar Proximity Zones during Reionization Huanqing Chen UChicago Science Team: Faintest Galaxies in the JWST Era PI: Nick Gnedin Reionization NASA/ESA Big Problem: What Drives Reionization?

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Model Galaxy Formation in Quasar Proximity Zones during Reionization

Huanqing Chen UChicago

I use Blue Waters to

Science Team: Faintest Galaxies in the JWST Era PI: Nick Gnedin

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Reionization

NASA/ESA

Big Problem: What Drives Reionization?

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Galaxies in Reionization

G. Illingworth,
R. Bouwens

& the HUDF09 Team

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New Flagship JWST: Probing Fainter Galaxies

Hubble JWST WF UD Mason+15

NASA

Studying reionization is the primary science goal of JWST.

Fainter

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Matsuoka+18

Quasars in Cosmic Reionization

Quasars are ultra luminous Active Galactic Nuclei What drives reionization? Galaxies: Faint Many Quasars: Bright Few

NASA, ESA, X. Fan (UA)

Mysteries of the First Quasars: Life time? ---> photons per quasar Host halo? ---> total number of quasars

Brighter Quasar Galaxy Number

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Current Observation

Need to study quasar-galaxy coevolution!

Underdensity? Quasar Field Random Field

Ota+18 Ota+18

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Computational Challenge

Large Dynamical Range: Quasar proximity zone: ~ 30 Mpc To resolve galaxy: ~100 pc Use ART Code (Adaptive Refinement Tree) 1024 root grids 7 levels of refinement

Quasar Field

Ota+18

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Dark matter
Gas dynamics
Dark matter
Gas dynamics
Atomic processes
Dark matter
Gas dynamics
Atomic processes
Radiative transfer

Computational Challenge

Dark matter

Different Physical Processes:

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Dark matter
Gas dynamics
Atomic processes
Radiative transfer
Star formation &

stellar feedback

Computational Challenge

>20,000 node-hours per simulation ~ 1TB per snapshot

Different Physical Processes:

We Need Bluewaters!

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3D Simulation

60 cMpc 60 kpc No Quasar Low L Quasar High L Quasar

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Star Formation History without Quasar

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Stars Form Earlier in Overdense Region

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Quasar Radiation Suppresses Star Formation

Quasar turns on

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Imprints on Luminosity Function

Quasar radiation does not affect the bright end Quasar radiation suppresses the faint end by ≲50%, Much smaller than the field-to- field variation

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Summary

Future flagship JWST will observing fainter galaxies in reionization
Mysteries of first galaxies, first quasars and their coevolution are

waiting to be solved

3D cosmological simulations help us understand galaxy formation in

quasar proximity zones

○ Star formation history varies with distance to quasar ○ Quasar radiation suppresses star formation in low mass halos ○ Quasar radiation leaves a small imprint on the galaxy luminosity function

Lots of fun ahead

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Non-linear Luminosity Dependence

(x10)

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Quasar Impact

Immediate Suppression in Low Stellar Mass Halos

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Synthetic Observable: Luminosity Function

<80% suppression on the fainter end, smaller than the field-to-field variation

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Intrinsic Variation in Star Formation Histories

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Immediate Suppression in Low Ms Halos

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Non-linear Luminosity Dependence

(x10)