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

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

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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SLIDE 1

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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SLIDE 2

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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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

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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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SLIDE 5

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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SLIDE 6

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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SLIDE 7

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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SLIDE 8

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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SLIDE 9

Autor: 5/10/16

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

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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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SLIDE 11

Autor: 5/10/16

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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SLIDE 12

Autor: 5/10/16

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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SLIDE 13

Autor: 5/10/16

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

Lyman-α forest

Lyman-α forest

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

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SLIDE 14

Autor: 5/10/16

Quasar: Lyman-α forest pixel:

Two matter density tracers

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

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SLIDE 15

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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SLIDE 16

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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SLIDE 17

Autor: 5/10/16

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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SLIDE 18

Autor: 5/10/16

Simulations and data

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

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SLIDE 19

Autor: 5/10/16

Simulations and data

BAO scale

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

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SLIDE 20

Autor: 5/10/16

Simulations and data

Lyα is an absorption => Correlation is negative

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

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SLIDE 21

Autor: 5/10/16

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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SLIDE 22

Autor: 5/10/16

Thank you for your attention

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