Degeneracy in One Dimensional Quantum Systems: Dynamically ...
The SN – GRB - NSpersonal.psu.edu/nnp/sn_grb04.pdfMészáros, Tata sngrb 04 An explosive...
Transcript of The SN – GRB - NSpersonal.psu.edu/nnp/sn_grb04.pdfMészáros, Tata sngrb 04 An explosive...
Mészáros, Tata sngrb 04
TheSN – GRB - NS
Connection
Peter MészárosPennsylvania State University &
Institute for Advanced Study, Princeton
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An explosive ancestry… leading to varying degrees of degeneracy :
SN – GRB – NS• Gamma Ray Bursts (GRB)ôBlack hole (BH)
ôSupernova (SN) ô collapsar, …• Magnetars, pulsars (neutron stars: NS), white dwarfs (WD)• And what they lead to…:
→ UHE g, UHE n (ultra-high energy g-ray,neutrinos)→ Ultra-high energy cosmic rays (UHECR) (GZK), → Gravitational Waves (GW) (KHz, mHz, mHz…)→ Electromagnetic (EM) flares : g, X, UV/O, sub-mm, R
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Subramanian Chandrasekhar
• Explained WD as compact cores supported by degeneracy pressure of electrons
• Leading the way to later understanding of NS as more massive cores supported by deg.press. of neutrons;
• and understanding of BH , for even larger masses
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GRB Sky & Temporal Distrib.
• Cosmological (isotropic) distribut.
• Out to z t 4.5 (20?)• ~ 1/day @ z d few• ~ 1/3 “short” (<2s)→ NS mergers/mag?
• ~ 2/3 “long” (>2s)→ massive coll/SN?
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GeV gemission from
GRB, PSR,SNR,
other galactic, extragalactic
&un-id sources• GeV: space obs. (SAS-2, HEAO-A4, Kvant….)• EGRET spark chamber: 5 GRB, 6 PSR & 60 blazars @d10GeV• + ~25 other Unidentified EGRET g-ray sources
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SNCommon physical classification:
• Thermonuclear runaway explosion, on accreting WD; progenitor: Mød 10 MŸ
→ Type Ia• Core collapse to NS (or BH)
+envelope ejection; progenitor: Mø t 10 MŸ
→ Type IIType Ib, Ic
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Ia
(Cardall ’03)
IbIcII
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Core collapse SN
Cardall 03 & U.Tenn
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Core-collapse SN bounce, shock &thermal n (10-30 MeV) production
( Cardall 03 & Terascale Supernova Initiative)
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SN spectral class:
•Type Ia: opt. brightest at max. light, and : good standard candles !→ supernova project: cosmology,
accel. U, dark energy… SNAP, etc•Type Ib, Ic, II (i.e. core collapse SNe):not very good standard candles…
but : very interesting ..! fl NS, BH..and GRB !
Filipenko 1997
•Type I: absence of H features- Ia: strong Si feature- Ib: no/weak Si, strong He- Ic: no/weak Si, no/weak He
•Type II: obvious H features- IIp: t 2MŸ H-env, H-abs. features- IIL: d 2MŸ H-env, weak H-abs.feat- IIn: no/weak H abs, narrow H emiss
L.C.: a) shock-heated envelopeb) 56Co → 56Fe radioact. tail
SN photometric class:
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Mremn.vs.
Møms
• Non-rotating single ms ø
• Mass-loss simplified
• Metallicitydependence?
• Core rotation, binary evol’n?
• etc
(from Heger, et al 03)
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Remnant Type vs. Init. Mass & Z
Heger et al aph/0212469
At higher mass,
high metallic flhigh wind massloss ∂ Z1/2 ;stronger afterH-env. is lost
flHe core incr.smaller
flRemnant incr. lessmassive
At low metallic.Mass lossUnimportant,BH boundarydet. by initialStellar mass
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Remn. Type & envelope (or lack) fl SN type vs. Init. Mass & Z
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Core rot.flCollapsar/Jet SN types
• Assumes
high
core
rotation
•Presence of JET fl collapsar or anisotrop. SN: •Occurs if can assume large core rotation, e.g. from magn instabin single ø, or binary evol, etc•Anisotr. SN: obs.•Evidence from opt pol (few %) (both SN & GRB)•May help also understandanomalies in nucleosy, etc
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“Hypernova” fl Anisotropic SNIb/c?
• Nomoto, Woosley, Fryer, Heger et al.: degree of anisotropy (and He core mass) may influence ejected 56Ni mass (hence strength of optical display)
• Viewing angle infleunce observed velocity of ejection (and inferred Eiso )
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Remnant type vs. redshift(tentative)
SN Ib/c
SN pair
BH
NS
• Fraction of massive stars leading to various SN and compact remnant types Ø follows from given Z-z dep.
• Implications: at high z, incr.
potential for- UV/X/g
ionizing flux- CRs, n’s, GW- seed accr BH
(→AGNs)- GRB, XR/IR
transients
Heger, Fryer etal, astroph/0212469
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NS/MGRNS remnant fivarious outcomes:
• “Normal” B (d1013 G):-Young gamma/radio PSR-ms recycled PSR-Isolated neutron stars (XR,..)-Accreting X-ray pulsar
• “Higher” B (t1013 G)-“Anomalous” X-ray pulsar/AXP-Magnetar: SGR (… GRB ?)fl various interesting effects?
vacuum polariz.,photon splitting…
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• Isolated pulsars: ~ 1300 known• Binary radio PSRs: ( many in
GCs,..); of particular interest for Gen.Relat., GW, mass det., etc
• XR surface emission: thermal spectrum – of interest for radius determinatio; not uniform (some pulsation); also a non-thermal PL component, ascribed to magnetospheric emission (more pulsed than thermal); extends down to O/IR
• Binary XRP: ~100, dozens w. cyclotron lines (e.g. XTE); of interest for field measurement. But : bright, Ø not best Chandra, XMM targets; recent advances have been in faint objects
• XMM: detected in binary XRPsXR lines at low energies, ascribed to metals in acc.disk
PSR/XRP
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PSR• Radio to gamma emission: • polar or outer gaps?fl GLAST should tell
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XRP
Cyclotron lines: XTE (Coburn et al, 02, ApJ 580, 394);
Inferred B compatible with spin up/down obs & young/ middle aged PSR surface fields .. (but..)
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Isolated X-ray PSRs• 1E1207: XR lines lines at
0.7, 1.4, 2.1 (coinc. w.instrline), maybe 2.8 keV → ?
• Bignami et al: cyclotron harmonics, indicate lower than usual field?
• Pavlov et al: single PSR, low surf temp and field, so oscill. strenght of higher harm too low to explain harmonics. Could be He in strong field ?(magn. levels quite π unmagn.)
• Several middle aged (10Kyr-Myr) isolated PSR show such lines;
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PSR Nebulae & MHD winds• PSR winds: seen by
Chandra in t20 PSR nebulae (t30 at other wavelenghts)
• Crab wind: outer wisps move (also opt)
• › Vela PSR: Chandra measures jet motion, especially interesting faint “outer jet”
Pavlov, GG, Teter, M.A, Kargaltsev, O, Sanwal, D, 2003,ApJ, 591, 1157 "The variable jet of the Vela pulsar"
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SGR/MGR sim.(courtesy NASA) • SGRs: leading explanation
is MGR (NS w. Bt1013 G)• AXP: probably not powered
by accretion: No companion seen, and O/IR spectrum does not fit disk Ø may be that AXP ~MGR ?(but: no compelling MGR explanation for O/IR sp)
• Also, two AXPs have now been seen to burst
• SGR X-ray sp. in quiesc is same as AXP, fl AXP ¨SGR
• March 5 SGR: used to have harder quiesc sp than AXPs, recently softened, looks ~ AXP NS/MGR
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QED effects on XR polarization modes
Even for B~1012 G, but particularly for BtBQ=m2 c3/ @e = 4.413 x 1013 G, at a critical freq (X/g) where vacuum effects cancel plasma effects Ø the polariz normal modes, as they go through the critical region, retain the same handedness, but change from para to perp (E resp B) ; in old plasma lit. the mode “does not change”, in some new lit. it “does change” identity.
(Ozel, Lai,….Pavlov, Meszaros..):
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Short(tg d 2 s)
Long(tgt 2 s)
GRB:→ (current paradigm)
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“long” GRB from “collapsars”
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Collapsar GRB (cont.)
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GRB: basic numbers
• Distance: 0.1 d z d4.5 → D ~ 10 28 cm • Fluence: ~10-4 -10-7 erg/cm2
~ 1 ph/cm2
• Energy output: 1053 (Ω/4π) D228.5 F-5 erg
jet: Ω ~ 10-2 – 10-1 → E γ,tot ~ 1051 erg
E γ,tot ~ LΘ x 1010 year ~ Lgal x 1 year• Rate(GRB) ~ 1/day → 10-6(Ω/2π)-1 /yr/gal
(whereas Rate [SN] ~ 107 /yr ~ 1/s at z d1)
∫= dtfluxF .
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BH + accr. Torus Jet• Both collapsar or merger → BH+accr.torus→fireball
• Massive rot. ø: sideways pressure confines/channel outflow → fireball Jet
• Nuclear density hot torus→ can have nn→e± jet
• Hot infall →convective dynamo → B~1015 G, twisted (thread BH?)→Alfvénic or e±pγ jet
• (Note: magnetar might do similar)
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Explosion FIREBALL• E γ t 1051 Ω-2 D2
28.5 F-5 erg • R0 ~ c t0 ~ 107 t-3 cm
Huge energy in very small volume • τγγ ~ (Eγ/R3
0mec2)σTR0 >> 1 → Fireball: e±,γ,p relativistic gas
• Lγ~Eγ/t0 >> LEdd → expanding (v~c) fireball(Cavallo & Rees, 1978 MN 183:359)
• Observe Eγ> 10 GeV …but γγ→e±, degrade 10 GeV →0.5 MeV? Eγ Et >2(mec2)2/(1-cosΘ)~4(mec2)2/Θ2
Ultrarelativistic flow → Γ t Θ-1 ~ 102
(Fenimore etal 93; Baring & Harding 94)
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Jet (outside the star) → shocks• Shocks expected in any
unsteady supersonic outflow (esp. in a non-vacuum environment)
• Internal shocks: fast shells catch up slower shells (unsteady flow)
• External Shock: flow slows down as plows into external medium
• NOTE: “external” and “internal” shocks might be expected also while jet is inside star, as well as after it is outside the star.If inside: gs do not escape (but n can)if outside: gs do escape (and n too)
ò“Internal” shocks
“external” shock →
reverse forward
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Non-thermal gs: Internal & External Shocksin optically thin medium outside progenitor:SHORT & LONG-TERM BEHAVIOR
• Lorentz factor Γ first grows Γ∂ r, then coasts Γ∂constant, until …
• Outside the star, after jet is opt. thin: Internal shocks: ri~1012cm→γ-rays (burst, t~sec)
• Externals shocks start at re ~1016cm, progressively weaken as it decelerates
PREDICTION :• External forward shock spectrum
softens in time: X-ray, optical, radio …→long fading afterglow !(t ~ min, hr, day, month)
• External reverse shock (less relativistic):Optical → quick fading ( t ~ mins)(Meszaros & Rees 1997 ApJ 476,232)
Γ
rrc ri re
Shocks solve radiative inefficiency problem (reconvert bulk kin. en. into random en. → radiation)
Int
Ext
Rø
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External Forward & Reverse ShockSynchroton & IC spectrum
← Forward shock IC (GeV g )
←Forward shock synchrotron(X,g)
← Reverse shock synchrotron (O)
Meszaros, Rees, Papathanassiou ’94, ApJ 432, 578
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GRB 970228 : BeppoSAXDiscovery of an afterglow
• X-ray location:2-3 arcmin →raster
• →optical (arcsec) & radio location
• Can identify host galaxy, redshift
• located atcosmological dist.
NEW ERA!Feb 28 March 3
F_x ~3E-12 erg.cm2/keV/s , decr. By 1/20
(Costa et al 1997, Nature 387:783)
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GRB afterglow blast wave model
• Simplest case: adiabatic forward shock synchrotron rad’n from shock-accel. non-thermal e-
• F(n,t) ∂ n-b t -a
• a = (3/2) b• Parameters E0, ee, eB,
(b=(p-1)/2)GRB 970228 as blast wave:
Wijers, Rees & Meszarosl 97 MNRAS 288:L51 fit to
Mészáros, Rees 97 ApJ 476:232 model
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Snapshot Afterglow Fits• Simplest case:
tcool(γm)>texp, where N(γ)∂γp for γ>γm (i.e. γc(ool) >γm)
• 3 breaks: na(bs), nm, nc • Fn∂n2 (n5/2) ; n<na ;
∂n1/3 ; na<n<nm ;∂n-(p-1)/2 ; nm<n<nc∂n-p/2 ; n>nc
(Mészáros, Rees & Wijers ’98 ApJ499:301)
Sari, Piran, Narayan ’98 ApJ(Let) 497:L17)
Break frequency decreases in time (at rate dep. on whether ext medium homog. or wind (e.g. r∂r -2 )
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Scintillation & Afterglow Limb Brightening
• Radio scintillations:→”sizes” Dr~1016 cm
at distance r~1017 cm• But: equal-arrival timesurfaces are “pears”,edges “younger/bright”→limb-brightening,obs. size < distance
(ÆWaxman 98; Sari 98; Panaitescu-Meszaros 98)
≠ (Granot et al, 99)
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GRB Afterglow Radio Detections
GRB970508
Frail, Kulkarni et al 01fireball model & calorimetry
Waxman, Kulkarni, Frail 99:Scintillations → (small) size !
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Shock Photon Spectrum• Non-thermal power law
spectrum, both in int. and ext. shocks, due to
• Synchrotron, peak at ~200 keV (or ~ eV?)
• Inv. Compton, peak ~ GeV (or ~200 keV ?
• Sy peak location, ratio Sy/IC dep. on Bsh , ge,m
• Peak softens with time• Ratio Sy/IC decr w. time
E
E2NE
Sy
IC
t
tF
E
E
X,OR g
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Fast Opt. Transients: ROTSE
• Robotic Optical Transient Search Experiment (Akerlof, etal, 99, Nat 398, 400)
• Cannon f/1.8 35mm cams coupled to CCD
• fast slew (3s anywhere)• Detected bright, prompt
(15s after trigger) optical flash in GRB990123
• Succesor experiments: ROTSE III, Super-LOTIS, RAPTOR, KAIT, TAROT, NEAT, Faulkes,REM, etc.
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Prompt Optical Flashes
• GRB 990123 → bright (9th mag) prompt opt. transient (Akerlof etal 99)
– 1st 10 min: decay steeper than forw. shock • Interpreted as reverse external shock • (predicted : Meszaros&Rees ’97)
• 99-02: Great Desert:Lack of flashes, upper limits mv~12-15
• but: New generation robotic tels: ROTSE III, Super-LOTIS, RAPTOR, KAIT, TAROT, NEAT, Faulkes, REM; etc
• → new prompt optical flashes:GRB 021004, 021211: similar to GRB 990123
• → new “semi- prompt” flashes,( ROTSE IIIa (AU), ROTSE IIIb (TX) ):
GRB 030418, 30723 : π from GRB 990123 !→ t >211, 50 s resp, see forw. shock only?steep rise (ascribed to dusty stell. wind) mR ~ 17 at t~ 30 min, then PL -1.35 decay
(Rykoff etal astro-ph/0310501)
Akerlof etal ’99 ↑
Kulkarni et al ’99 ↑
nFn
n
Sy (rev)
Sy (forw)
0 X,g
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Light curve break: Jet Edge Effects
• Monochromatic break in light curve time power law
• expect G∂t-3/8, as long as qlight cone ~G-1 < qjet, (spherical approx is valid)
• “see” jet edge at G ~ qjet-1
• Before edge, Fn∂(r/G)2.In• After edge, Fn∂(rqjet)2.In ,
→ Fn steeper by G2∂t-3/4
• After edge, also side exp. → further steepen Fn∂t-p
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Jet Collimation& Energetics
Berger etal 03
• Jet opening angle inv. corr. w. Lg(iso)
• → Lg(corr) ~ const.• GRB030329: evid.
for 2-comp. jet: qg~5o < qradio ~17o
• Etotal = Eg+Ekin~ const.
(→ quasi-standard candle )
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Collapsar & SN :does one imply the other ?
• Core collapse of star w. Mt30 MŸ
→ BH + disk (if fast rot.core) → jet (MHD? baryonic? high G,
+ SNR envelope eject (?)• 3D hydro simulations (Newtonian
SR) show that baryonic jet w.high G can be formed/escape
• SNR: not seen numerically yet(but: several previous observational suggestions, e.g. late l.c. hump + reddening- and debate) ;
…… and more recently …
Collapsar & SN (ANIMATION!)
Credit: Derek Fox
& NASA Ø
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GRB 030329 ¤ SN 2003dh : Yes !
• Nearest “unequivocal” cosmological GRB: z=0.17
• GRB-SN association: “strong”• Fluence:10-4 erg cm-2 ,
among highest in BATSE,but Dtg~30s, nearby; Eg,iso~1050.5erg: ~typical,
• ESN2003dh,iso ~1052.3 erg ~ ESN1998bw,iso (¨grb980425)
vsn,ej~0.1c (→ “hypernova”)• GRB-SN imultaneous? at most:
d 2 days off-set (from opt. lightcurve)
( ï i.e. not a “supra-nova”)• But: might be 2-stage (<2 day
delay) ø- NS-BH collapse ?→n predictions may test this !
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Other GRB-SN• Earliest, most famous & debated
example: (Galama et al, 1998)
GRB980425-SN1998bw(Esn ~1052 erg, but z~0.008, Egrb,iso 1047 erg odd)
• Other possible examples (w/o SN sp.):“red bump” in lightcurve:
GRB980326 (Bloom 99), GRB970228 (Reichart99, Galama 00), GRB000911 (Lazzati 01), GRB991208 (Castro 01), GRB990712 (Sahu00), GRB011211 (Bloom 02), GRB020405 (Price 03)
• Red bump alternative model:dust sublimation or scattering?(Waxman-Draine 00, Esin-Blandford 00)
Possible, but SN spectrum now available in at least two cases
GRB021211 - SN 2002lt
(Dela Valle et al, 2003 AA 406, L33)
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END
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Fraction of massive stars leading to various SNe & GRB
Heger etal 03