Exploring Junctions of Filamentary Structure with SUZAKU

Hajime Kawahara (TMU)

~ 80 % of Baryons is still missing

Stars in Galaxies

~ 10 %

Hot gases in Galaxy

Clusters ~ 10 %

FOV is so small

70 Mpc

Simulated Universe ( Takei+ 2011)

Assuming @z=0.1

Galaxy clusters

Detectable by Low sensitivity sky surveys

Field of View of High sensitivity Satellites

Suzaku search for emission from missing baryons

Nearby of a massive cluster

Akamatsu+2011

Middle of two massive clusters

Mitsuishi+2011

No missing baryon was found.

SDSS galaxy map

RA

DEC

Points: SDSS spectroscopic galaxiesCurves: DisPerSE : filament extractor Sousbie 2011, Sousbie, Pichon, & Kawahara 2011

Kawahara+ApJL 2011

z

Massive ClusterA2142

Rosat All Sky Survey

The referee might need courage to accept the observation of “blank fields”

$ 30 billion (total)/ 5 years x 80 ksec

= $ 0.15 million for “blank field” !

Thank you very much for accepting

Massive ClusterA2142

Rosat All Sky Survey

Kawahara, Yoshitake,Nishimichi & Sousbie ApJL, 727, L38 (2011)

X-ray Brightness 0.5-5 keV (104 cnt/s/cm2/sr)Hardness Ratio H=0.4-1.1,S=1.1-2.0 keV Optical image (DSS)

1.64+0.35−0.11 (STAT) ±0.05 (SYS) keV

3.91+1.06-0.75(STAT) ±0.28 (SYS) keV

Merging group Suzaku J1552+2739

Anderson+2009

500 kpc

redshift

Bullet cluster

Suzaku J1552+2739

A1750A2142 A1758

Massive ClusterA2142 Merging Galaxy Group

Suzaku J1552+2739

9 keV

1.6 keV

Suzaku J1552+2739 is not WHIM ( < 1 keV )But was Missing Baryon

In 2011 (Suzaku AO-6 period)

How to select the targets ?

In 2011 (AO6)DisPerSe + SDSS DR7

3D Structure

X-ray Map (RASS) BCG like galaxy

Sekiya, HK + in prep

Junction 1 Junction 2 Junction 3

T ~ 0.7 keV T ~ 1.3 keV T ~ 0.7 keV ?

Preliminary results of 3 new junctions

Hardness Ratio (0.5-1 & 1-5 keV)

XMM

If observing good positions, even current satellites can glance the low-T missing world of the Universe

Star: major merger

Conclusions

local universe

ROSAT

Chandra