Introduc)on:+GCDX+ Fe*6.7*keV (Nobukawa+*12) 100*pc* *0.7 - - PowerPoint PPT Presentation

Introduc)on:+GCDX+

(Nobukawa+*12)

100*pc**0.7° Fe*6.7*keV Hot*plasma*(7×107K):*What*is*the*origin?

1.*Point*source* *H*Spectrum(Cataclysmic*Var.*(CV)*etc.;*Wang+02,*Muno+04)* * 2.*Diffuse*interstellar*plasma* *H*EW,*line*raSo,*Profile*(Koyama+*07,09,*Uchiyama+*11,13)*

*

However,*sound*speed*>>*escape*velocity* *!*gravitaSonally*NOT+bound* 2/15%

Introduc)on:+GCDX+

1.*Point*source* *H*Spectrum(Cataclysmic*Var.*(CV)*etc.;*Wang+02,*Muno+04)* *

Hot*plasma*(7×107K):*What*is*the*origin?

2.*Diffuse*interstellar*plasma* *H*EW,*line*raSo,*Profile*(Koyama+*07,09,*Uchiyama+*11,13)*

1.*NIR*imaging* →Stellar*density* ←old*giants*↔*CVs* *(Yasui,*Nagatomo) 2.*NIR*polarimetry* →MagneSc*field* MagneSc*confinement*

(Nishiyama+*09,*10,*13)

However,*sound*speed*>>*escape*velocity* *!*gravitaSonally*NOT+bound* 3/15%

NIR+Stellar+Density+Map+

+3 +2 +1 )2 )3 )1 Galac.c%Longitude%[deg] Galac.c%La.tude%[deg] Num.%of%Stars%[arcmin)2]

ExSncSon*corrected* Stellar*number*density 6°*=*840*pc

J:**1.2*μm** H:*1.6*μm** Ks:2.2*μm Nuclear*bulge Nuclear** star*cluster GalacSc*bulge

IRSF/SIRIUS*observaSons*(Nishiyama+*06)

4/15%

Fe XXV intensity The number of stars

6.7*keV* [10−7*photons*secH1** cmH2*arcminH2]

NormalizaSon

Num.*of*Stars* [arcminH2] 0° +2° +4° +6° +8° −2° GalacSc*Longitude

200 100 50 20 10 50 10 1 5 2

6.7keV*intensity*

(Koyama+*07,*Uchiyama+11)

Stellar** number** density

NIR+Stellar+Density+Map+

GalacSc*Bulge** (1°*<*|ℓ*|*<*8°)

5/15%

Fe XXV intensity The number of stars

6.7*keV* [10−7*photons*secH1** cmH2*arcminH2]

NormalizaSon

Num.*of*Stars* [arcminH2] 0° +2° +4° +6° +8° −2° GalacSc*Longitude

200 100 50 20 10 50 10 1 5 2

6.7keV*intensity*

(Koyama+*07,*Uchiyama+11)

Stellar** number** density

NIR+Stellar+Density+Map+

0.5 1.0 2.0 5.0 10.0 20.0 50.0 Fe XXV intensity The number of stars

GalacSc*Bulge** (1°*<*|ℓ*|*<*8°)

X*(6.7keV)* IR*(star)

6/15%

Nuclear*Bulge** (|ℓ*|*<*1°)

0.5 1.0 2.0 5.0 10.0 20.0 50.0 Fe XXV intensity The number of stars

NIR+Stellar+Density+Map+

ContribuSon*

• f*old*stars*

to*6.7*keV* (IR/X)

1.0 0.2 0.6 1.4100*%*

@Gal.bulge 50*%* @Nuc.*bulge 20*%@NSC

0° +2° −2° GalacSc*Longitude

Nuclear*Bulge** (|ℓ*|*<*1°)

7/15%

0.5 1.0 2.0 5.0 10.0 20.0 50.0 5 10 20 50 100 200 Fe XXV intensity The number of stars

+2 +1 0 )2 )1

Galac.c%Longitude%[deg]

*Hot*(7×107K)*plasma*observed*in*XHray*at*GC* <1>*NIR*imaging*observaSons*(Yasui+*in*prep)* *6.7*keV*profile*↔*Old*stellar*populaSon* *●*clear*excess*of*6.7*keV* ***!*truly*diffuse*plasma* *●*contribuSon*from*old*stellar*populaSon* ***!*20*H*50%*@*<*200*pc*

Short+Summary+

How*is*plasma*bound?* What*input*huge*energy?

MagneSc*Confinement*of*Hot*Plasma*

(Makishima+*94H96,*Tanuma+99)

8/15%

Polarization! in optical/NIR! … dust extinction! Dust Grain B

Transmitted

Unpolarized Star Light

Magne)c+Field+in+the+GC+

J:**1.2*μm** H:*1.6*μm** Ks:2.2*μm 2°*=*280*pc 3°*=*420*pc

NIR*Polarimetry*(IRSF/SIRPOL,*Nishiyama+*09,*10)

9/15%

Magne)c+Field+in+the+GC+ 3°**420*pc 2°**280*pc

10/15%

560,000 (2.2μm, δP < 1.0%)$

Ks polarization map 3×2 (P/δP ≥ 2)

3°**420*pc 2°**280*pc

0.5%

Magne)c+Field+in+the+GC+

11/15%

Ks polarization map 3×2

90

• MF direction[°]

Histogram of $ MF direction

• 0.4° < b < +0.4°

parallel to $ the plane

Magne)c+Field+in+the+GC+

Toroidal Field

12/15%

• 0.4° < b < +0.4°

Toroidal Field

Ks polarization map 3×2

90

• MF direction[°]

Histogram of $ MF direction perpendicular$ to the plane

Magne)c+Field+in+the+GC+

Poloidal Field Poloidal Field

13/15%

• 0.4° < b < +0.4°

Toroidal Field

Ks polarization map 3×2

90

Magne)c+Field+in+the+GC+

Poloidal Field Poloidal Field

14/15% Sofue*&** Fujimoto*87*

100*pc*=*0°.7

+2 +1 0 )2 )1

Galac.c%Longitude%[deg]

Summary+

*Hot*(7×107K)*plasma*in*XHray*at*Galac)c+Center+ <1>*NIR*imaging*observaSons*(Yasui,*Nagatomo)* *6.7*keV*line*emission*↔*Old*stellar*populaSon* *●*clear*excess*of*6.7*keV* ***!*truly*diffuse*plasma* *●*contribuSon*from*old+stellar*populaSon* ***!20*H*50%*@*<200*pc* <2>*NIR*polarimetry* *!*toroidal*magneSc*field** *"*MagneSc*confinement** * **of*the*Hot*plasma* *(Nishiyama+*09,*10,*13)

15/15%