The Halo Occupation Distribution of H-alpha emitters Carlton Baugh - - PowerPoint PPT Presentation

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Jul 27, 2023 333 likes •466 views

The Halo Occupation Distribution of H-alpha emitters Carlton Baugh Institute for Computational Cosmology Durham University Predicting H- a flux Compute number of Lyman continuum photons Depends on metallicity stars are produced with

SLIDE 1

The Halo Occupation Distribution

f H-alpha emitters

Carlton Baugh Institute for Computational Cosmology Durham University

SLIDE 2

Predicting H-a flux

Compute number of Lyman

continuum photons

Depends on metallicity stars

are produced with

x1.5 variation over range

close to solar

Canonical conversion:

Kennicutt 1983

SLIDE 3

Predicting H-a flux

Compute number of Lyman

continuum photons

Depends on metallicity stars

are produced with

x1.5 variation over range

close to solar

Canonical conversion:

Kennicutt 1983

SLIDE 4

Predicting H-a flux

Variations due to metallicity with which stars are formed and SF history

SLIDE 5

Direct estimate now includes Dust extinction (as per continuum) Typically, 1 magnitude of extinction is assumed in observational work.

SLIDE 6

Direct estimate now includes Dust extinction (as per continuum) Typically, 1 magnitude of extinction is assumed in observational work.

SLIDE 7

Evolution of the LF

Observed LF: HiZELS Sobral et al. 2012

SLIDE 8

HOD of H-a emitters at z=2.23

370 emitters, ~2sq deg z=2.23 Geach et al. 2012 arXiv:1206.4052

SLIDE 9

HOD z=0.40 Euclid flux limit

Black: total
Blue: central
Red: satellite

SLIDE 10

HOD z=0.84 Euclid flux limit

SLIDE 11

HOD z=1.4 Euclid flux limit

SLIDE 12

HOD z=2.23 Euclid flux limit

SLIDE 13

Summary

H-alpha luminosity depends on Lyman

continuum photons

Number of Lyman continuum photons

depends on metallicity & SF history

Using solar conversion factor can lead to large

errors

Also need to include dust extinction
HOD for Euclid flux limits: N<<1