SZ measurements with existing data sets

SZ measurements with existing data sets

Stefania Amodeo

Cornell University

With Nick Battaglia (Cornell), Emmanuel Schaan (LBL), Simone Ferraro (LBL), Emily Moser (Cornell) and the ACT team

11th CMB-S4 Workshop, 13 August 2020

Sunyaev-Zel’dovich Effects

tSZ: hot gas

T (⌫)

T _CMB = f _⌫ ^T m _e c ²

Z

los

P _e dl

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kSZ: all ionized gas

T

T _CMB = Z

los

dl n _{e T} v c

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Emergence of kSZ detections

Also: Adam et al. (2017), Sayers et al. (2013, 2019) and others Hand et al. 2012

Planck 2016

Schaan et al. 2016

de Bernardis et al. 2017 Soergel et al. 2016

Hill et al. 2016

3-5σ

Baryon profiles with kSZ and tSZ cross-correlation measurements

CMB BOSS

(you are here)

BOSS CMASS spectroscopic galaxy catalog

tSZ: T decrement (includes dust thermal emission) kSZ: l.o.s. velocity - weighted T

“velocity reconstruction” method (Planck15, Schaan Ferraro+16)

Stack CMB temperature maps

at the galaxies’ positions + Aperture photometry filtering

Schaan, Ferraro, Amodeo, Battaglia +

PRELIMINA PRELIMINAR

Y

Schaan, Ferraro, Amodeo, Battaglia + ACT in prep.

7σ

11σ

polytropic index

non-thermal pressure

feedback efficiency

2-halo density norm.

2-halo pressure norm.

Combining kSZ and tSZ: non-thermal pressure and feedback

Polytropic gas model (Ostriker et al. 2005)

PRELIMINAR

Y 15% constraints on feedback

30% constraints on non-thermal pressure

Amodeo, Battaglia, Schaan, Ferraro + ACT in prep.

PRELIMINAR

Y

Density-weighted Electron Temperature

polytropic index

non-thermal pressure

feedback efficiency

2-halo density norm.

2-halo pressure norm.

Combining kSZ and tSZ: gas temperature profile

Polytropic gas model (Ostriker et al. 2005)

PRELIMINAR

Y

Amodeo, Battaglia, Schaan, Ferraro + ACT in prep.

PRELIMINAR

Y

kSZ and tSZ: gas density and pressure profiles Tests of cosmological simulations

Gas profiles in galaxy groups (~1-4 virial radii)

Less steep, more extended than the dark matter profile (NFW rejected at 96σ)

Hydro sims (Illustris, Battaglia) significantly lower at large radii

Sub-grid stellar and AGN feedback models implemented in sims do not go that far

Amodeo, Battaglia, Schaan, Ferraro + ACT in prep.

kSZ: baryon correction to galaxy-galaxy lensing modeling

(Leauthaud+17)

Amodeo, Battaglia, Schaan, Ferraro + ACT in prep.

Including baryons reduces

but does not fully reconcile the tension with measurements

“Lensing is low”

Joint tSZ and kSZ cross-correlation measurements are powerful probes of the CGM:

• Baryon profiles in low-density environments and out to the outskirts

• Feedback processes, non-thermal pressure, gas temperature

• Tests of hydrodynamical simulations

• Impact on galaxy-galaxy lensing modeling

Upcoming kSZ/tSZ from ACT : Amodeo+, Schaan+, Calafut+, Vavagiakis+

Conclusions