a multi-wavelength view of the environment of z~6 qsosc. mazzucchelli extremely big eyes on the...

A Multi-Wavelength View of the Environment of z~6 QSOs

C. Mazzucchelli (ESO)E. Bañados1,2, B. Venemans2, R. Decarli3, E. P.

Farina2, F. Walter2, A.-C. Eilers2, X. Fan4

1Carnegie Observatories, 2Max Planck Institute for Astronomy, 3INAF-OAB, 4Steward Observatory

HZQSO Environments: Theoretical Predictions

C. Mazzucchelli Extremely Big Eyes on the Early Universe – 29 Jan 2019

Angulo+2012

Quasars at high redshift (z>6) are expected to be found in high density peaks of the dark matter distribution and to be surrounded by overdensities of galaxies

Quasars as signposts of the

first overdensities

Volonteri & Rees 2006, Springel+2005, Overzier+2009, Angulo+2012,Habouzit+2018

HZQSO Environments: Observations in the Literature


Overdensities

Morselli+2014

Stiavelli+2005,Kim+2009, Utsumi+2010, Husband+2013, Balmaverde+2017

J1030

No Overdensities

Simpson+2014

J1120

Willott+2005, Kim+2009,Decarli+2012 Banados+2013, Uchiyama+2017

Observational studies offer ambigous evidence so far

HZQSO Environments: Observations in the Literature


Overdensities

Morselli+2014

Stiavelli+2005,Kim+2009, Utsumi+2010, Husband+2013, Balmaverde+2017

J1030

No Overdensities

Simpson+2014

J1120

Willott+2005, Kim+2009,Decarli+2012 Banados+2013, Uchiyama+2017

Observational studies offer ambigous evidence so far

Mainly based onLyman Break Galaxies Δz~1

Lyman Alpha EmittersΔz~0.1

Narrow Band Study of a Quasar @ z=5.7


Simpson+2014

Search for Lya emitting galaxies around QSOs through Narrow Band Deep Imaging in clean atmospheric windows

Search for LAEs around a z~5.7 QSOs

Dunlop+2013FORS2 @ VLT

Mazzucchelli+2017a

6 LAEs LLya ~ 2-5 x 1042 [erg/s] SFR ~ 1-3 [Msun / yr]

PSOJ216-15

Comparison with Blank Fields : LAEs Number Counts


Blank Field: Ouchi+2008Blank Field: Hu+2010QSO @ z=5.7 : Bañados+2013Mazzucchelli+2017a

Comparison with Blank Fields : LAEs Number Counts


Simpson+2014

Blank Field: Ouchi+2008Blank Field: Hu+2010QSO @ z=5.7 : Bañados+2013Mazzucchelli+2017a

No evidence of enhancement of LAEs with respect to blank fields

Why No Overdensities?


● Cosmic Variance

● Ionizing radiation from the quasar prevents galaxy formation

● Surrounding galaxies are dust obscured

Utsumi+2010 → no galaxies with 3 pMpc from quasar

Yajima+2015 → evolved dust/obscured adjacent galaxies

only few fields inspected for LAEs

● Quasars at high redshift do not inhabit massive dark matter halo

Fanidakis+2013

Gas–Rich Companion Galaxies from ALMA


Simpson+2014

ALMA Cycle 3 Survey of Dust Continuum and [CII] Emission in 27 z~6 QSOs

Discovery of gas rich, dust obscured and highly star forming companion galaxies

Decarli,..,CM+2017,Nature

d~9-60 kpc L[CII]~109 Lsun LIR~1011 Lsun SFR>100 Msun/yr

Decarli,..,CM+2018, Venemans,..,CM+2018

Gas–Rich Companion Galaxies from ALMA


Simpson+2014

ALMA Cycle 3 Survey of Dust Continuum and [CII] Emission in 27 z~6 QSOs

Discovery of gas rich, dust obscured and highly star forming companion galaxies

d~9-60 kpc L[CII]~109 Lsun LIR~1011 Lsun SFR>100 Msun/yr

Highly overdense regions in the early

Universe

Decarli,..,CM+2018, Venemans,..,CM+2018

Decarli,..,CM+2017,Nature

Companion Galaxies : Follow-up Observations


Mazzucchelli+submR. A. (J2000)

Dec

l. (J

2000

)

J210

0PJ

231

J084

2PJ

167

F140W [3.6] [3.6] Res [4.5] Res[4.5]

HST/WFC3 Spitzer/IRAC

Companion Galaxies : Follow-up Observations


Mazzucchelli+subm

No Emission at S/N>3in the rest-frame OPT/NIR range

in 3/4 companions

R. A. (J2000)

Dec

l. (J

2000

)

J210

0PJ

231

J084

2PJ

167

F140W [3.6] [3.6] Res [4.5] Res[4.5]

HST/WFC3 Spitzer/IRAC

A Peculiar Case : PSOJ167-13


Continuum-subtracted [C II] 158 m ALMA 0.3” res + HST/WFC3 contours HST/WFC3 map + PSF SUB

Companion galaxy detected at 0.9” ~

5kpc and 270 km/s

Companion Galaxies : Spectral Energy Distribution


Observed Wavelength [μm]Observed Wavelength [μm]

Rest Frame Wavelength [μm]λL

umin

osity

[Lsu

n]

NGC6946

M82M51

Arp220

Mazzucchelli+subm

Companion Galaxies : Spectral Energy Distribution


SEDs consistent withArp 220 like galaxies

Observed Wavelength [μm]Observed Wavelength [μm]

Rest Frame Wavelength [μm]λL

umin

osity

[Lsu

n]

NGC6946

M82M51

Arp220

Mazzucchelli+subm

Companion Galaxies : Obscured Star Formation Fraction


Mazzucchelli+subm

Log Stellar Mass [Msun]

SFR

IR /

SFR

UV

+IR

What is Next?


What is Next? JWST View


1) Stellar Mass of the companions + QSO Host Galaxy

2) Hα Emission Line + SFR

3) Larger Scale Environment [2’ x 2’]

NIRCAM/JWST

JWST

Observed Wavelength [μm]

λLum

inos

ity [L

sun]

What is Next? JWST View


1) Stellar Mass of the companions + QSO Host Galaxy

2) Hα Emission Line + SFR

3) Larger Scale Environment [2’ x 2’]

NIRCAM/JWST

NIRSPEC/JWST IFU

Nebular Emission Lines [OII],[OIII],HβMorphology / kinematics [3”x3”]

What is Next? Persective from the ground


1) ELT / MICADO → BB + NB selection

What is Next? Persective from the ground


1) ELT / MICADO → BB + NB selection

2) ELT / MOSAIC → ~100 spec in 0.8-1.8 → ~10 IFU → diam ~7’ (FORS2/VLT)

GMT / GMACS → ~100 spec in 0.3-1. → diam ~20’

Conclusions


● No overdensities of LAEs around a z~5.7 QSO

● 3/4 ALMA detected companion galaxies around 20% of z~6 QSOs are gas-rich, heavily dust obscured and extremely star

forming

● Space (JWST) and Ground (ELTs) -based sinergies for the next decade observations

Slide 1Slide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Slide 23

a multi-wavelength view of the environment of z~6 qsosc. mazzucchelli extremely big eyes on the...

Documents