the remnants of supernovae and particle acceleration in ...€¦ · the remnants of supernovae !...
TRANSCRIPT
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the remnants of supernovae !and particle acceleration!
in the fermi era
4th fermi symposium monterey, ca
daniel castro (mit)
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remnants of supernovae supernova remnants black holes pulsars pulsar wind nebulae
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remnants of supernovae supernova remnants black holes pulsars pulsar wind nebulae
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remnants of supernovae supernova remnants - part I black holes pulsars pulsar wind nebulae – part 2 (very short!)
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remnants of supernovae supernova remnants - part I
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outline why do we care about the connection between SNRs and cosmic rays? what evidence is there that SNRs accelerate cosmic rays? what are the open questions being addressed today? what are we working on right now? where are we going?
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i. why? why should we care about the connection between SNRs and cosmic rays?
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i. why?
• origin • ɣ-ray background • particle acceleration • SNR evolution
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i. why?
• origin • ɣ-ray background • particle acceleration • SNR evolution
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i. why?
• origin • ɣ-ray background • particle acceleration • SNR evolution
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i. why?
caprioli 2012 + upcoming talk
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i. why?
• origin • ɣ-ray background • particle acceleration • SNR evolution see e.g., castro+ 2011
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ii. evidence what evidence is there that SNRs accelerate cosmic rays?
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ii. evidence
• non-thermal X-rays • ɣ-ray emission • dynamical properties • structure
koyama+ 1995
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ii. evidence
• non-thermal X-rays • ɣ-ray emission • dynamical properties • structure
rx j1713.7-3936
rcw 86
sn 1006
vela jr.
TeV keV
hinton & hofmann 2009
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ii. evidence
• non-thermal X-rays • ɣ-ray emission • dynamical properties • structure
rx j1713.7-3936
rcw 86
sn 1006
vela jr.
hinton & hofmann 2009 uchiyama+ 2002 sschenbach 1998
vink+ 2006 aharonian+ 2006, 2007,2008
naumann-godo+ 2006
keV TeV
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ii. evidence
• non-thermal X-rays • ɣ-ray emission • dynamical properties • structure
LAT SNR catalog: upcoming talk by terry brandt
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ii. evidence
• non-thermal X-rays • ɣ-ray emission • dynamical properties • structure
hughes+ 2000
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ii. evidence
helder+ 2009
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ii. evidence
• non-thermal X-rays • ɣ-ray emission • dynamical properties • structure
4 5 6 7 8radius (pc)
1x10-26
1x10-25
1x10-24
0.01
0.1
1de
nsity
(g.c
m-3
)
num
ber d
ensi
ty (c
m-3
)
pre-shockISM
shockedISM
shockedejecta
unshockedejecta
RS CD FS
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ii. evidence
• non-thermal X-rays • ɣ-ray emission • dynamical properties • structure
warren+ 2005
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ii. evidence
• non-thermal X-rays • ɣ-ray emission • dynamical properties • structure
warren+ 2005
warren+ 2005
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ii. evidence
• non-thermal X-rays • ɣ-ray emission • dynamical properties • structure • non-thermal X-rays
uchiyama+ 2007
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iii. open questions what are the open questions being addressed today?
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iii. hadronic or leptonic what mechanism produces the ɣ-ray emission from SNRs?
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iii. hadronic or leptonic
abdo+ 2011 ellison+ 2010
rx j1713.7-3946
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iii. hadronic or leptonic
inoue+ 2012
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iii. hadronic or leptonic
giuliani+ 2012 – AGILE 50 MeV – 10 GeV observations of w44
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iii. magnetic field amplification how does the magnetic field get amplified by particle acceleration and escape in SNRs?
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evidence .spectral curvature in radio emission (a little iffy) .broad-band fits of synchrotron emission between radio and non-thermal X-rays .sharp X-ray edges .rapid variability of nonthermal X-ray emission from bright filaments in SNRs
iii. magnetic field amplification
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iii. escape and diffusion what is the spectrum of accelerated particles which escape the SNR shock? how do these particles diffuse through the ISM and CSM? can we observe signatures of escape in ɣ-ray emission near SNRs?
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iii. escape and diffusion
see: • uchiyama (poster) – w44 • cardillo (poster) – propagation • schuppan+ 2012 – ionization
ellison & bykov+ 2011
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iii. molecular clouds what happens when SNR shocks interact with dense clouds of material?
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iii. molecular clouds
Molecular Cloud
SNR Shock
SNR Interior
Shocked Cloud Material
Clumps
• castro & slane (2010,2012): - w30 + ctb 37a + g349.7-0.5 + 3c391 - w41 + ctb 33 + msh 17-39 - x-ray density << ɣ-ray density
see also: • uchiyama+ 2010 – reacceleration • inoue+ 2010 – diffusion • schuppan+ 2012 – ionization • cohen (poster) – fermi-lat analysis • de Palma (poster) – also fermi-lat analysis
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iv. current & future research
what are we working on right now? where are we going?
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iv. ctb 109
0.03
0.025
0.02
0.015
0.0104:00 02:00 23:00:00 22:58:00
15:00
59:00:00
45:00
58:30:00
Right ascension
Dec
linat
ion
castro+ 2012
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iv. ctb 109
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iv. ctb 109
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iv. our research where we are going…
• time evolution of emission • correlation between morphology and ɣ-rays • high-res X-ray spectra (MCs & CRs)
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iv. time evolution of emission
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iv. time evolution of emission
dermer & powale 2012
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iv. time evolution of emission
2x103 4x103 6x103 8x103 1x104
Age (years)
2x10-9
3x10-9
4x10-9
5x10-9
6x10-9
F X (e
rg c
m-2
s-1)
castro+ 2011
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iv. morphology and ɣ-rays ell
iptic
ity /
elong
atio
n
mirror asymmetry
lopez+ 2011
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iv. high-res X-ray spectra
hwang+ 2005
Micro-X Science Instrument
Power / Telemetry
S19 Guidance
ACS
ORSA
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iv. high-res X-ray spectra
1energy (keV)
chandra-acis
micro-x
underlying
0.5 2hwang+ 2005
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iv. high-res X-ray spectra
why should you care? - puppis A is interacting with
a dense cloud at BEK (hwang+ 2005)
- detected with Fermi-LAT (hewitt+ 2012, see poster)
- katsuda+ (2012) found enhanced f/r ratios in xmm-newton RGS x-ray spectra of BEK
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iv. high-res X-ray spectra
0.2 0.4 0.6 0.8 1 1.2 1.4
020
0040
0060
00
Energy (keV)
Flux
(cou
nts/
s/ke
V)
Puppis A “BEK” regionMicro-X 300 s simulationbased on VNEI + CX !tto Chandra ACIS data
Model shows best-!tVNEI-only for Chandra
1.31 1.32 1.33 1.34 1.35 1.36Energy (keV)
Mg XItriplet
VNEI has excess resonance line
...and is missinghigh-n Ne X lines
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iv. recent/upcoming instruments
- NuStar + Astro-H – hard x-rays = constraints on sed
- Astro-H + Micro-X – x-ray micro-calorimeters = detailed nature of shocked dense material
- CTA – more effective area, coverage to 10s of GeV (more SNRs + better sed)
- ALMA – possibly synchrotron continuum + ionized molecular material
- JWST – synchrotron continuum? a lot more?
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remnants of supernovae pulsar wind nebulae – part 2 (very short!)
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outline why do we care about pulsar wind nebulae? what are the open questions being addressed today?
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i. why? • pulsars
• particle acceleration
• SN & environment
• ɣ-ray sources • flares
ackermann+ 2011
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ii. open questions
• the Crab, the Crab, the Crab
• population studies of ɣ-ray PWNe
• how many of the unidentified GeV and TeV sources are PWNe?
• reverse shock compression?
slane+ 2010, slane+ 2012, temim+ 2012
see Josh Lande’s poster
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ii. open questions
talks: - Romain Rousseau - Fermi LAT Observations of TeV PWNe Candidates at GeV Energies - Lola Falletti - Observation of the Mouse Pulsar Region with the Fermi-LAT Telescope - Takayuki Saito - Observations of the Crab Pulsar and Nebula with the MAGIC Telescopes - Eduardo Striani - The Surprising Crab Nebula posters: - Ioanna Arka - Gamma rays by synchrotron radiation in pulsar winds - Joshua Lande - Search for Pulsar Wind Nebulae in the Off-Peak Regions of Pulsars in the
Second Fermi LAT Pulsar Catalog - Amanda Weinstein - Methods of establishing correlation between extended GeV and TeV emission - Colleen Wilson-Hodge - Hard X-ray Variations in the Crab Nebula - Elizabeth Hays - Studies of Crab variability in simulated Fermi LAT data
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the end