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Galactic Big Bang :MW Explosion
Yoshiaki SOFUE2013
銀河系の大爆発
Radio X Rays
Gamma Ray
BHS Model
AstronomicalExplosions
The Sun
Stars
Galaxies
The Universe
How about the MW?
Galactic Big Bang?
The North Polar Spur:
SNR 説Prof. Oort’ suggestion, Spoelstra, Berkhuijsen, ROSAT PhD Thesis (SNR)….. et al.Even in Japan, Oda, Hayakawa, ...... et al
Hayakawa et al. 1977Galactic Radio Loops I, II, III, IV
1.Galaxies1.GalaxiesStarburstStarburst
Shell / Outflow Shell / Outflow
M82
NGC 253ROSAT 0.75 keVPietsch et al 1999
NGC 253NGC 253 NGC 3079 NGC 3079 NGC 891NGC 891 NGC 4258 NGC 4258
NGC 30790.75 keV
2. Galactic Center
Gas, Mag. Fields, Cosmic rays outflows.
3x3 deg (400 x 400 pc) at 3 cm NRO 45m (Sofue, Handa et al.)
Cold gases are quiet: ring, clouds 2x0.5 deg (300 x 60 pc) (BTL 7m Bally et al.)
North Polar SpurNorth Polar Spur 408 MHz408 MHz
408MHz RadioHaslam et al 1982
408 MHz ROSAT 0.75 keV
2. Bipolar Hyper 2. Bipolar Hyper Shell Model for Shell Model for
NPSNPS
Sofue 1977
Fast MHD (compression) wave
Sofue 1977
Sofue 1977
Sofue 1977
EE ~~ 101055-5655-56 ergs ergs ~~ 10104-5 4-5 SNSN t t ~ 10~ 106-76-7 yr yr
Shock wavesShock waves E E ~ 1/2 ~ 1/2 MvMv22 ~~ 4π/3 ρ4π/3 ρrr33vv22
ρρ ~~ 1010-3-3 H/cc H/cc (Halo)(Halo) rr ~~ 5 kpc5 kpc, , MM ~~ 101077MM◎◎
vv ~~ 200-300 km/s200-300 km/s T~ T~ 101077 K K→ → Soft X raysSoft X rays
Radial-rayadiabatic Shock Sakashita, Moellenhoff method
Bipolar Hyper Shell ModelBipolar Hyper Shell ModelSofue 1977, 1984 cf Tomiska, Ikeuchi 1988, Suchkov et al 1994
Numerical Hydrodynamics:Sofue & Habe 2013 (in prepa)
3. Simulationofof
ObservationsObservations
Radio synchrotron
RRadio emissivityadio emissivityB-CR equipartitionB-CR equipartition
εε∝∝ B Bγγ∝∝ ρραα
HI Disk & Arms
RadioNo arm
RadioArms
Obs. 408 MHz Obs.
Radio
408MHz RadioHaslam et al 1982
X-rays 0.25, 0.75, 1.5 keV Soft X-rays
XX-ray emissivity-ray emissivity BrehmsungBrehmsung εε∝∝ρρ22TT0.50.5
TransferTransfer:: Absorption bAbsorption by metals y metals in in HI DiskHI Disk
dI/ds=ε-κIdI/ds=ε-κI κds=dτ=nκds=dτ=nHHds/Nds/NH,0 H,0
X-ray Absorption X-ray Absorption κκ atat 0.25, 0.75, 1.50.25, 0.75, 1.5 keV keV
0.75 keV:0.75 keV: TauTau=1=1 for for
NNH,0H,0=3x10=3x1021 21 H cmH cm-2 -2 =1 kpc x=1 kpc x 1 H c1 H cmm-3-3
Sofue 1994 ApJL
Snowden et al. 1993
1.5 keVNo arm
0.75 keVNo arm
0.75 keVNo armCylinder/Cone
Soft X
0.25 kev
1.5 kev
0.75 kev
Arms
Galactic Big Bang15 Myr ago,1056 ergs.
Galxies: NGC 253
4. Implications4. Implications
MW Big Bang15 Myr ago,1055-56 ergs.
Implication Implication
Probing StarburstProbing Starburst Probing HI diskProbing HI disk Probing Gas HaloProbing Gas Halo Probing Halo-IGProbing Halo-IG Interface Interface Probing IProbing ICM, IGMCM, IGM PProbing Halo Windowrobing Halo Window
HI(red)+H2(green)HI(red)+H2(green)Nakanishi & SofueNakanishi & Sofue20062006
Galactic big bang in an intergalactic wind
5. The End of 40 yrs Debate
vs SNR hypothesis!
Fermi Bubble
Fermi Gamma rays1, 2, 5, 10 GeV
MW big bang model: 15 Myr ago, 1056 ergs.Sofue since 1970’
Radio X Rays
Gamma Ray
BHS Model
Radio+Gamma
X + Gamma
Gamma Ray
Further models to appear
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