X-rays from Massive Star Fo ｒ ming Region (YSO) ？ Sgr B2 、 Arches, Mon R2 Herbig Ae/Be stars

Sgr B2 Cluster of Massive Stars. No10: Associated to UC HII regions No13: No association to UC HII regions No13 No10

ｋT～10(4.1-30) N H ～4.0( ) Lx~ 13 x10 32 erg/s ｋT～4.8(> 1.1) N H ～4.0( )10 ２３ Lx~8 x10 32 erg/s Total Lx~10 33 erg/s  Each Lx ～ erg/s No10: Strong iron line (Abundance ~5M ◎ ) No13: Weak iron line

Arches Cluster ● IR ； No21, 23, 26: High mass (Initial mass > 100M ◎ ) ● Radio ； AR1, 4

Name kT N H L x (keV) (10 23 Hcm -2 ) (10 33 erg s -1 ) ( ) 6.9( ) 2.8( ) 21(AR4) 1.3( ) 9.3( ) 3.9( ) 23(AR1) 1.6( ) 9.9( ) 5.0( ) Irradiation by the Arches X-ray Total luminosity ~10 35 ergs/s 10 time larger than the present value. One possibility is that the Arches cluster may be brighter in the past.

Mon R2 Cloud 2.5 M ◎ More massive than B H-K K

kT ～ keV, L x ～ erg/s Rapid variability NamekT N H Lx (keV) (10 22 Hcm -2 ) (10 31 erg/s) IRS 1SW 1.9( ) 4.7( )1 ( ) a S 2.6( ) 6.0( )0.6( ) IRS ( > 2.0) 9.1(5.7-17) 0.6( )

X-ray Properties with Chandra

ASCA detection of Herbig Ae/Be Stars Detection rate ~40% (>10 30 ergs/s)

Temperature vs Wind Velocity of Herbig Ae/Be 2~3keV

MWC 297 : O9 - B1.5 N H ～ 2.4×10 22 (Av =10 agree with optical) Temperature Excursion kT= 2.7keV  6.7keV  3.2 keV 2.7keV 6.7keV 3.2keV

Temperature Excursion of Individual Herbig Ae/Be Quiescent (●), Flare (□), Decay ( △ )

Unified View of X-ray emission from Stars

Ｕｎｉｆｉ ed Picture of X-rays From Stars 10 6 yrs