A new window on galaxyevolution
Joaquín Armijo, Carlton Baugh, Peder Norberg

Canadian-France Redshift Survey

Luminosity function

Star formation rate densityGalaxy evolution(see Madau & Dickinson
2014 for a review)
Lilly+ (1996)

Mapping galaxies to trace their evolutionzCOSMOS (i<22.5) 1.7 sq. deg• zCOSMOS (2006) observed about 20k i-band
selected galaxies (i<22.5).

• Connection between galaxy evolution andlarge-scale environments.

zMapping galaxies to trace their evolution

DESI BGS(r < 19.8)
zCOSMOS(i < 22.5)

14k sq. deg.

1.7 sq. deg

DESI LRG,ELG(zfiber<21.5, g<23.5,Also color cuts)

Mapping galaxies to trace their evolution

GAMA(r < 19.8)
zCOSMOS(i < 22.5)

200 sq. deg.

1.7 sq. deg

VIPERS(46% spectroscopic sampling) 24 sq. deg(i<22.5)

Mapping galaxies to trace their evolution

GAMA(r < 19.8)
zCOSMOS(i < 22.5)

200 sq. deg.

1.7 sq. deg

PAUS(i<23)

60 sq. deg.

VIPERS(i<22.5)

24 sq. deg

Photometric redshift survey

Stothert+ (2018)

The Physics Of The Accelerating Universe Survey (PAUS)

The PAUS collaboration: ICE, IFAE (Barcelona), Durham, UCL, Leiden

The Physics Of The Accelerating Universe Survey (PAUS)
40 Narrow bands• 40 x130Å-wide NB filters covering 45008500 Å.

• Provide low-resolution spectra (Δλ/λ ~ 2%,or R ~ 50)• Expected photometric galaxy
redshift accuracy of σ(z) ~ 0.0035×(1+z)

Stothert+ (2018)

The Physics Of The Accelerating Universe Survey (PAUS)

Most recent production (last week)

Sources with 40 NBs• PAUS has covered 45 sq. deg. in 196
nights (50% lost to poor weather)

The PAUS collaboration: ICE, IFAE (Barcelona), Durham, UCL, Leiden

Photometric redshift accuracy
Aim: 0.35% error on photo-z
50% best data

• Photo-z performance validated on theCOSMOS field.

• Photo-z precision σ(z)/(1 + z) ~ 0.001
for a high-quality selection, driven by
the identification of emission lines.
• Precision required to study clustering ofgalaxies.

Photometric redshift accuracy
𝜎68 : 68% confidence region

i-bandOutliers:

Δ𝑧> 0.02
1+𝑧

i-bandEriksen+ (2018)

Photometric redshift quality validation• PAUS has covered 45 sq. deg.
• PAUS has covered 45 sq. deg.
in 196 nights (50% lost to poor
COSMOS field data
in 196 nights (50% lost to poorweather)weather)Data:

good quality

bad quality

good quality

bad quality

PAUS redshift distribution(r < 19.8)(r < 17.5)(i < 23.0)(i < 22.5)

Almost 10 times bigger than othersurveys in a comparable redshift
range

Stothert+ (2018)

The galaxy luminosity function

Faber+ (2007)

The galaxy luminosity function

K-correction needed!

Faber+ (2007)

PAUS-Blue Magnitude

Narrow band limits

Stothert+ (2018)

PAUS-Blue Magnitude
PAUS data
The NBs cover a range
between 4500-8500 Å andcan be used to construct an
artificial blue band forgalaxies at 0.11 < z < 0.9 .

Raw magnitude distribution

𝑀𝐵𝑙𝑢𝑒 − 5 log ℎ

PAUS mock𝑀𝑖 − 5 log ℎPAUS mock

𝑀𝐵𝑙𝑢𝑒 − 5 log ℎ

Raw magnitude distribution

𝑀𝑖 − 5 log ℎAs the selection of galaxies in PAUS is made in the i-band, this must beaccounted when we compute the luminosity function in the b band.

PAUS mock

𝑀𝐵𝑙𝑢𝑒 − 5 log ℎ

Raw magnitude distribution

𝑀𝑖 − 5 log ℎAs the selection of galaxies in PAUS is made in the i-band, this must be
accounted when we compute the luminosity function in the b band.

Preliminary PAUS results data COSMOS field
PAUS dataFuture work
• Check that the blue magnitude defined in PAUS agrees with the blue broad band
definition.
• Compute the luminosity function in the PAUS-Blue restframe magnitude considering
the i-band selection.
• Add uncertainties on mock lightcone redshift to see the impact on the Luminosityfunction.

Summary and Conclusion• Galaxy surveys as zCOSMOS, GAMA, VIPERS and PAUS trace the galaxy evolution
at the second half of cosmic history.
• The PAU survey aims to observe photo-z with 0.35% errors. Such uncertainties
need to be tested on the mock lightcones.
• A restframe Blue magnitude is defined in PAUS to observe the evolution of thecosmic star formation rate density.
• The luminosity function in the i-band is used to select galaxies and obtain the blueband luminosity function.

Thank you !

K(z)PAUS i-band luminosity functionzPhotometric redshift quality validation
COSMOS field data

Data:

good quality

bad quality

good quality

bad quality

Mock light-cones
PAUS mock lightcone

Stothert+ (2018)