Quasar-Lyman Forest Cross- Correlation from BOSS survey: Baryon - - PowerPoint PPT Presentation

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Nov 18, 2022 406 likes •635 views

Quasar-Lyman Forest Cross- Correlation from BOSS survey: Baryon Acoustic Oscillations Autor: 5/10/16 Hlion du Mas des Bourboux (CEA) Pheniics Doctoral School Days Outline Introduction to

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Autor: 5/10/16

Quasar-Lyman α Forest Cross- Correlation from BOSS survey: Baryon Acoustic Oscillations

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

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Autor: 5/10/16

Introduction to BAO cross-correlation
Matter density tracers
Simulations and data comparison

Outline

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

SLIDE 3

Autor: 5/10/16

Introduction to BAO cross-correlation
Matter density tracers
Simulations and data comparison

Outline

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

SLIDE 4

Autor: 5/10/16

Preface

What the theory gives for

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

BAO scale

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Preface

Multiply by a factor

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

BAO scale

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Autor: 5/10/16

Preface

Multiply by a factor

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

BAO scale

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Autor: 5/10/16

Modern Cosmology

Modern Cosmology model ΛCDM is very robust
But uses two unknown components: DE and DM

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

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Autor: 5/10/16

BAO and Cosmology

Oscillations of the baryon-photon plasma in potential well.

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

Detected in the CMB matter power spectrum.

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BAO and Cosmology

A way to understand the nature of DE and DM is to

know their density evolution

Baryonic Acoustic Oscillations allow to do so

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

SLIDE 10

Autor: 5/10/16

Introduction to BAO cross-correlation
Matter density tracers
Simulations and data comparison

Outline

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

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Quasar flux originates from the surrounding of a super-massive black hole Spectrum of a BOSS Quasar at redshift z = 3.35, the Universe was only 2 billion years old

Quasar

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

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Get redshift from emission lines A Quasar is a boolean matter density tracer

Quasar

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

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Absorption lines from Hydrogen continuum in the Intergalactic Medium (IGM) A Lyman-α pixel gives a continuous matter density tracer

Lyman-α forest

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

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Quasar: Lyman-α forest pixel:

Two matter density tracers

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

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Autor: 5/10/16

Introduction to BAO cross-correlation
Matter density tracers
Simulations and data comparison

Outline

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

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Autor: 5/10/16

Simulations

In order to study the robustness of the correlation

function:

– Covariance matrix – Bias in measures – Error bars of the measures

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

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Gaussian Random Field Simulations

IGM image provided by Julien Baur

QSO set on big Over-density Apply telescope properties Lyα forest along the line-of-sight

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

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Simulations and data

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

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Simulations and data

BAO scale

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

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Simulations and data

Lyα is an absorption => Correlation is negative

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

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Conclusion

BAO scale measurements give the DE and DM

density evolution.

Lyman-α forests and quasars give the furthest

measures of BAO scale.

I have developed simulations of the measure. They

allow to test its robustness.

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days

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Thank you for your attention

Hélion du Mas des Bourboux (CEA) Pheniics Doctoral School Days