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

2/15% Introduc)on:+GCDX+ Fe*6.7*keV � (Nobukawa+*12) � 100*pc* � *0.7° � Hot*plasma*( � 7×10 7 K):*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 *

3/15% Introduc)on:+GCDX+ 1.*NIR*imaging* 2.*NIR*polarimetry* →Stellar*density* →MagneSc*field* ← old *giants*↔*CVs* MagneSc*confinement* *(Yasui,*Nagatomo) � (Nishiyama+*09,*10,*13) � Hot*plasma*( � 7×10 7 K):*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 *

4/15% NIR+Stellar+Density+Map+ IRSF/SIRIUS*observaSons*(Nishiyama+*06) � J:**1.2*μm** H:*1.6*μm** Ks:2.2*μm � 6°*=*840*pc � Galac.c%La.tude%[deg] � Num.%of%Stars%[arcmin )2 ] � Nuclear** Nuclear*bulge � star*cluster � GalacSc*bulge � ExSncSon*corrected* Stellar*number*density � +3 � +2 � +1 � )1 � 0 � )2 � )3 � Galac.c%Longitude%[deg] �

5/15% NIR+Stellar+Density+Map+ 50 � 6.7keV*intensity * [10 −7 *photons*sec H1 ** Num.*of*Stars* 200 � (Koyama+*07,*Uchiyama+11) � cm H2 *arcmin H2 ] � [arcmin H2 ] � Fe XXV intensity The number of stars 100 � 10 � 6.7*keV* GalacSc*Bulge** 50 � 5 � (1°*<*| ℓ *|*<*8°) � Stellar** 20 � 2 � number** 10 � 1 � NormalizaSon � density � +8° � +6° � +4° � +2° � 0° � −2° � GalacSc*Longitude �

6/15% NIR+Stellar+Density+Map+ 50 � 6.7keV*intensity * [10 −7 *photons*sec H1 ** Num.*of*Stars* 200 � (Koyama+*07,*Uchiyama+11) � cm H2 *arcmin H2 ] � [arcmin H2 ] � Fe XXV intensity The number of stars 100 � 10 � 6.7*keV* GalacSc*Bulge** 50 � 5 � (1°*<*| ℓ *|*<*8°) � Stellar** 20 � 2 � number** 10 � 1 � X*(6.7keV)* NormalizaSon � density � 50.0 Fe XXV intensity IR*(star) � +8° � +6° � +4° � +2° � 0° � −2° � The number of stars 20.0 GalacSc*Longitude � 10.0 5.0 Nuclear*Bulge** 2.0 (| ℓ *|*<*1°) � 1.0 0.5

7/15% NIR+Stellar+Density+Map+ ContribuSon* 1.4 � 100*%* of*old*stars* @Gal.bulge � to*6.7*keV* 1.0 � (IR/X) � 50.0 0.6 � � 50*%* Fe XXV intensity The number of stars @Nuc.*bulge � 20.0 � 20*%@NSC � 0.2 � 10.0 +2° � 0° � −2° � 5.0 GalacSc*Longitude � Nuclear*Bulge** 2.0 (| ℓ *|*<*1°) � 1.0 0.5

8/15% Short+Summary+ *Hot*( � 7×10 7 K)*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* 50.0 *** ! * � 20*H*50%*@*<*200*pc* Fe XXV intensity The number of stars 200 20.0 How*is*plasma*bound?* 100 10.0 50 What*input*huge*energy? � 5.0 20 2.0 MagneSc*Confinement*of*Hot*Plasma* 10 1.0 (Makishima+*94H96,*Tanuma+99) � 5 0.5 +2 � +1 � 0 � )1 � )2 � Galac.c%Longitude%[deg] �

9/15% Magne)c+Field+in+the+GC+ NIR* Polarimetry *(IRSF/SIRPOL,* Nishiyama+*09,*10 ) � J:**1.2*μm** 2°*=*280*pc � H:*1.6*μm** Ks:2.2*μm � 3°*=*420*pc � Unpolarized B Polarization ! Star Light in optical/NIR ! … dust extinction ! Dust Grain Transmitted

10/15% Magne)c+Field+in+the+GC+ � 560,000 (2.2 μ m, δ P < 1.0%) $ 2°* � *280*pc � 3°* � *420*pc �

11/15% Magne)c+Field+in+the+GC+ 0.5% Ks polarization map 3 � × 2 � ( P / δ P ≥ 2) � 2°* � *280*pc � 3°* � *420*pc �

12/15% Magne)c+Field+in+the+GC+ MF direction[°] Ks polarization map 3 � × 2 � Histogram of $ MF direction � -0.4° < b < +0.4° � Toroidal Field � parallel to $ the plane � �� ��� ���� 0 �� 90 ��

13/15% Magne)c+Field+in+the+GC+ MF direction[°] Ks polarization map 3 � × 2 � Histogram of $ Poloidal Field � MF direction � -0.4° < b < +0.4° � Toroidal Field � � perpendicular $ to the plane � Poloidal Field � �� ��� ���� 0 �� 90 ��

14/15% Magne)c+Field+in+the+GC+ Ks polarization map 3 � × 2 � Poloidal Field � -0.4° < b < +0.4° � Toroidal Field � Poloidal Field � Sofue*&** Fujimoto*87 * 0 �� 90 ��

15/15% Summary+ *Hot*( � 7×10 7 K)*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* 100*pc*=*0°.7 � *** ! � 20*H*50%*@*<200*pc* <2>*NIR*polarimetry* +2 � )1 � +1 � 0 � )2 � Galac.c%Longitude%[deg] � * ! *toroidal*magneSc*field** * " *MagneSc*confinement** * **of*the*Hot*plasma* * (Nishiyama+*09,*10,*13) �