expanding velocity random velocity (shock) : temperature of ion ( t i) is
DESCRIPTION
Expanding velocity Random velocity (shock) : temperature of Ion ( T i) is higher than electron (Te ). Ion temperature, T i. Ionization temeprature: T z. Study of SNR Canonical Scenario of Dynamical Evolution This determines the shell-like morphology and thermal - PowerPoint PPT PresentationTRANSCRIPT
Expanding velocity
Random velocity (shock)
: temperature of Ion (Ti) is
higher than electron (Te)
Study of SNRCanonical Scenario of DynamicalEvolution
This determines the shell-like morphology
and thermal spectrum
Ion temperature, Ti
Enegy transfer
Ionization temeprature: Tz
mv2 = 3kT
NEI (Te > Tz) CIE (Te=Tz)
Electron temperature: Te
Key Project Make a New Scenario of Thermal Plasma in MM-SNRs. This is not theory-oriented, but observation-oriented project : Spectrum Survey of bright MM-SNRs
1. Shell-like SNR Canonical evolution of dynamics : Canonical model & analysis: NEI, PSHOCK Many proposals, Observations & Papers 2. Mixed Morphology (MM) SNR No Canonical Model No analysis method A few observations
Thin thermal spectra = 2 Type of SNRs
○ Are Spectra of MM-SNR Suzaku Legacy ? Yes, because1.A few Observation sUnexpected facts may be found ( Observation-Oriented study = DNA of X -ray Astronomy)2.Suzaku has Low background, High energy resolution and Large effective area.
Radiative Recombination Continuum (RRC: 1-st time for Collisional Ionized Plasma) Over-ionized Plasma ( Recombining Plasma: RP):
vs ( Ionizing Plasma :IP=NEI)
Paradigm isSSS (Einstein)
RP may provide a New Science of Suzaku
○ What progress would be in RP ? Hint: RP-detected MM-SNRs ( IC443, W44, W28, W49B, G359.1-0.5) are all TeV/GeV Sources
Spectrum of W28-Center (Sawada et al.) kTe=kTz= 0.90 keV kTe=0.47, kTz=0.96
RRC has large Impacts on the Abundances
RRC
Bremss
Relaiable abundances Proper model of the Plasma Line and RRC based diagnosis is essential (not bremss) Revise the abundances using Suzaku (in particular, those in MM-SNR) Path Finder of Astro-H
CIE model RP model
In RP, Radiative Recombination Continuum (RRC) is Dominant.kTe : low -> emissivity of collisional excitation : small. bremss : small Abundancess: large On the other hand, Line flux is increased by cascade after recombination Abundances : small
G359.1-0.5
1-CIE kT e Ab(Si) Ab(S) 0.77 2.3 2.5
RP Model0.29 12 17 0.77 (kTz)
G359.1
ASCA: Shell-like MM SNR
Suzaku A few MM -SNR ,Compared to Shell-like SNRs
Added a few MM-SNR with AO5Then, what does Suzaku change from ASCA ?kTe , Abundances
RP Region
Kawasaki et al.
IP (NEI)
List of RP SNRs and our Progress of the RP Analysis
W44 W28
IC443Brems+lines
G359.1-0.51CIE+Ly+RRCs
W49BICIE+Ly+RRC
Upper: 1CIELower: Full RP
Our mission is to search for these some events.We provide observational evidence to search for the some events.
Science of Recombining Plasma
Ionizing Plasma (IP) traces standard evolution of shock dynamics Canonical model : Shell-like, NEI, PSHOCKRecombining Plasma (RP) remembers some events in the early phase of MM-SNR.
RP is not Local but Glo b al
W49B
IC443
○ Initial photo ionization such as GRB ? f > 1050 erg (Same order of UV photons in HII region)
○ Rarefaction in initial phase ○ Related to the particle accelaration (CR) ?
Tz/Te mapall > 1
CSMn ~ 大
ISMn ~小
log t (year)
Initial rarefactionHigh density CSM: Te=Tz break out to low density ISM adiabatic cooling Te decrease○ Sudden increase shock velocity ( >normal case) Max Energy (∝ v2 ) Low density (ISM ) suppress the Coulomb interaction with thermal particles more efficient acceleration
log
r
(pc)
1 2 3
1
0
Itoh & Masai
Diffusive Shock Acceleration model does not reach to the Knee Energy( The problem of Cosmic Ray Acceleration )The rarefaction Scinario may solve this problem ?
Big solar flare : RP is associated with Hard X-ray T
z
Te
Time (~ 1000 sec ) (Kato and Masai)
Te
Hard X
Tz
event
Memory
Normalized by nt , A few thousand years for SNRs
CIE
GeV ・ TeV/RP : What is a key ? May be Supra Thermal ( = CR Injector)
0.5keV
Supra Thermal (2 keV) : Highly Ionize
Flu
x
X-ray EnergyIonization of Si
Recombination
Only a few % can make RRC, R P
off-diagonal model Astro-H
: CR Injector GeV/TeVStrong Injector for MM-SNR
+2keV
What will the RP Science tell us ? Possible answers are;
Cosmic Ray Injector Supra Thermal RP GeV, TeV astronomy
T e are separately determined by RRC and Bremss Abundances Search for hidden h ard components
Information of Line and RRC is essential for the Plasma Diagnosis Path Finder for Astro-H
(Yamaguchi et al., submitted to ApJ
| |
G344
StrongAl !
3C397
G344
Tycho
Very strongCr-line (and Ni) !
Unexpectd discovery may not be only RP
Unbiased MM-SNR study will make the Suzaku legacy
Obserbation-oriented science which is the DNA of X-ray astronomy
(Nature may be much more imaginative than we are)
There must be unknown Gold Mines .
Lets search for Gold Mines !
Target List (priority order) from the ASCA results-----------------------------------------------------------------------------------------------Name kTe He-α(Si)* Size(arcmin) Obs(ksec) &
------------------------------------------------------------------------------------------------
G349.7+0.2+ \ 1.1 0.13 3 160Kes 79+ 0.7 0.5 10 50 G292.0+1.8 0.5 0.5 12×8 40G350.1-0.3 1.46 0.3 4 70G290.1-0.8 0.63 0.2 19×14 110Kes27 0.55 0.2 21 120G272.2-3.2 0.73 0.15 15 150 G337.2-0.7 0.85 0.08 6 200 $$
--------------------------------------------------------------------------------------------- * peak values of Si Heα (unit is arbitrary) from ASCA, For comparison, the Heα flux in W49B is ~1. + maser source \ GeV source $$Truncated to 2/3
& Observation time is estimated by the simulation assuming that RP spectrum is Tz/Te = 1.4 (typical) and that CIE model is rejected with > 3σ level.
e.g. Simulation for Kes 79 (50 ksec: Upper Left) & G337.2-0.7 (200 ksec: Lower Left and Right.)
Te (keV) 0.635 (0.626 -- 0.645)
Tz (keV) 0.635 (0.626 -- 0.645)
Tz/Te ---
Z_Si (solar) 1.23 (1.17 -- 1.29)
Z_S (solar) 1.39 (1.32 -- 1.47)
Z_Ar (solar) 1.11 (0.843 -- 1.38)
chi2/dof 572.43/418 = 1.40
Te (keV) 0.495 (0.477 -- 0.514)
Tz (keV) 0.713 (0.675 -- 0.750)
Tz/Te 1.44 (1.38 -- 1.49)
Z_Si (solar) 1.82 (1.71 -- 1.93)
Z_S (solar) 2.25 (2.05 -- 2.45)
Z_Ar (solar) 2.19 (1.64 -- 2.79)
chi2/dof 447.50/417 = 1.07
RP
CIE: Kes 79
CIE: G337.2
CIE
The End
Path Finder for Astro-H= Physics of high Temperature Space Plasma ( Pure Plasma )
kTe
kT
z
0.3 kTe 1.2
1.2
kTz
0.3
z/w
e.g. : z/w is not only for density diagnosisPlasma is more fantastic
Diagnosis with degenerated Kα Line Energy Diagnosis with resolved lines ( New Science )Excitation (w) vsCascade, Recombination line (z) : RP
e.g.1.Suzaku can plot data on the kTe-kTz plane.The center energy of He-like Kα should be give by fine structure2. If it deviates , then the plasma has bulk motion, or non/Supra-thermal components or Else ?These are the subjects of Astro-HSuzaku is the path-finder
Fe Kα < 6.7 keV
Ionizing Plasma k Te=3 keV kTz=1 keVCas A
Recombining Plasmak Te=1keVkTz=3 keVW49B
(1) Initial condition kTz >>kTe Canonical SNR Photo-ionization by GRB and Afterglow: W49B (2) Canonical SNR, kTe is cooled down by thermal conduction to clouds. (3) Explosion in a dense CSM (high kT CIE plasma) break-out to the ISM kTe cooling by adiabatic expansion. (4) Ionization by supra /non-thermal electrons (big solar flares: a RP phenomena and a hard X-ray tail ). Hard X-ray is hidden behind the continuum . All the RP-detected SNRs (5 MM-SNRs) are TeV/GeV sources .
--------------------------------------------------------------------------------------Name kTe He-α(Si) * (Fe)* --------------------------------------------------------------------------------------Kes 79 0.7 0.5G272.2-3.2 0.73 0.15G290.1-0.8 0.63 0.2G292.0+1.8 0.5+1.5 0.5 G309.2-0.6 1.96 0.07Kes27 0.4-0.7 0.2G337.2-0.7 0.85 0.06 G349.7+0.2 1.1 0.13 0.003G350.1-0.3 1.46 0.3 0.0015G352.7-0.1 1.6 0.05 0.001--------------------------------------------------------------------------------------Caption: * peak values of Heα (Si) and Fe (unit is arbitrary), For comparison, W49B are 0.55 (Heα, Si) and 0.15 (Fe). With XIS, these values become 2 time(for Si) and 10 times (for Fe) larger. ------------------------------------------------------------------------------------
Thse are the ASCA pictureSuzaku make revolution on the ASCA picture
And move on Astro-HWhich is Line+ RRC based Plasma Diagnosis
-------------------------------------------------------------------------------------Name kTe1 kTz kTe2 TeV GeV
--------------------------------------------------------------------------------------------RP detected------
W28 0.47 0.96 Y YW44 0.55 0.71 Y YW49B 1.5 2.7 Y YIC443 0.6 1-1.2 Y YG359.1-0.5 0.29 0.77 Y ----possibly detected------ G346.6-0.2 0.7 1.0 ----Non-detection of RP ------G344.7-0.1 0.95 5.0G348.5+0.1 0.4 0.9 Y YG355.6-0.0 0.6 3C397 ?3C391 ?----------------------------------------------------------------------------------------Captions: “Y” marks in the row of TeV, GeV, OH and MC
Back: Proper ProjectBlue: Sub ProductRed :AO5
IP