x-rays from massive star fo r ming region (yso)
DESCRIPTION
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. k T ~ 10(4.1-30) N H ~ 4.0(1.9-8.8 ) - PowerPoint PPT PresentationTRANSCRIPT
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 regionsNo13: No association to UC HII regions
No13 No10
k T ~ 10(4.1-30)NH ~ 4.0(1.9-8.8)Lx~ 13 x1032erg/s
k T ~ 4.8(> 1.1)NH ~ 4.0(2.4-7.3)10 23
Lx~8 x1032 erg/s
Total Lx~1033 erg/s Each Lx ~ 1032 erg/sNo10: 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 NH L x (keV) (1023Hcm-2) (1033 erg s-1)
26 2.4(1.3-5.6) 6.9(4.5-11.2) 2.8(2.3-3.4)
21(AR4) 1.3(0.6-2.5) 9.3(5.6-15.5) 3.9(3.1-4.7)
23(AR1) 1.6(1.0-2.7) 9.9(6.514.8) 5.0(4.2-6.0)
Irradiation by the Arches X-rayTotal luminosity ~1035 ergs/s10 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 ~ 2 - 10 keV, Lx ~ 1031 erg/sRapid variability
Name kT NH Lx (keV) (1022Hcm-2) (1031erg/s)
IRS 1SW 1.9(1.3-2.8) 4.7(3.5-6.4) 1 (0.6-2.0)aS 2.6(1.6-6.2) 6.0(4.0-9.2) 0.6(0.4-1.6)
IRS 2 10.9( > 2.0) 9.1(5.7-17) 0.6(0.5-2.0)
X-ray Properties with Chandra
ASCA detection of Herbig Ae/Be Stars
Detection rate ~40%(>1030 ergs/s)
Temperature vs Wind Velocity of Herbig Ae/Be
2~3keV
MWC 297 : O9 - B1.5NH ~ 2.4×1022 (Av =10 agree with optical) Temperature ExcursionkT= 2.7keV 6.7keV 3.2 keV
2.7keV6.7keV
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 Stars106 yrs