Blazars: GeV-TeV connection · Location of VHE emission? Difficult inside BLR! Strong absorption...
Transcript of Blazars: GeV-TeV connection · Location of VHE emission? Difficult inside BLR! Strong absorption...
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Blazars: GeV-TeV connection
F.Tavecchio
INAF-OAB
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GeV-TeV connection in FSRQs
GeV-TeV connection in extreme HBL
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Foss
ati et
al.
1998
; Don
ato
et a
l. 20
01
CT
AGILE
Fermi
The “blazar sequence”
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Foss
ati et
al.
1998
; Don
ato
et a
l. 20
01
CT
AGILE
Fermi
The “blazar sequence”
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Abdo et al. 2011
Mkn 421Aleksic et al. 2012
Nice description of the HE bump
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Abdo et al. 2011
Mkn 421Aleksic et al. 2012
Nice description of the HE bump
Di!erent integration
times!
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GeV and TeV emission of FSRQ
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e-!
e-
e- !!
B
Dermer et al. 2009Ghisellini, FT 2009Sikora et al. 2009
Accretion disk
BLR
DU
ST
Y T
OR
US
Setting the stage
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Bonnoli et al. 2011
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Huge optical depth of BLR
FT & Mazin 2009
FT et al. 2012
GeV TeV
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The breakthrough: the FSRQ 1222+216
tdouble~10 min!
cm
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Location of VHE emission? Difficult inside BLR!
Strong absorption (E>30 GeV within BLR, E>1 TeV outside) (e.g. Liu et al. 2008, Reimer 2007, FT & Mazin 2009)
Decline of the IC scattering efficiency (e.g. Albert et al. 2008, FT & Ghisellini 2008)
General
Model dependent (not applicabile to
hadronic)
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RBLR
!
!b
RIR
Tavecchio et al. 2011
External emission?
“Standard” SED
Variable VHE
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Tavecchio et al. 2011
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e.g. Ghisellini et al. 2008, 2009
Giannios et al 2009
Marscher & Jorstad 2010
Possibilities to reconcile large d and rapid variability
Minijets from fast reconnection
Magnetocentrifugal acceleration
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Possibilities to reconcile large d and rapid variability
Minijets from fast reconnection
Magnetocentrifugal acceleration
Too high B? (>100 G, Nalewajko +2012)
E/B~26
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Possibilities to reconcile large d and rapid variability
Minijets from fast reconnection
Magnetocentrifugal acceleration
Large IC cooling!
Too high B? (>100 G, Nalewajko +2012)
E/B~26
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Possibilities to reconcile large d and rapid variability
Radiative
efficiency
Bromberg & Levinson 2009
"=0.27
2d, semianalitic calculations “Focusing”
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RMHD simulations by G. Bodo
Low cool. High Cool.
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Dermer et al. 2012
UHE Neutral beams?
neutrinos
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An “exotic” scenario: photon-axion oscillation
Tavecchio et al. 2012, submitted
Standard
Axions
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GeV and TeV emission of extreme HBL
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FT et al. 2009
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B>0
Effective B-field
The reprocessed flux is diluted within a larger
solid angle
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B>0!
FT et al. 2010
Neronov et al. 2010Dolag et al. 2010
Dermer et al. 2011
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Vovk et al. 2012
LAT 3 years!Reprocessed?
Direct?
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Bonnoli et al., in prep
A population of IGMF probes?
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SUMMARY
LBL-HBL: nice description of IC bump
(caveat: long LAT integration)
FSRQs: unexpected and challenging VHE emission:
need for more examples!
Extreme HBL: probes for EBL and EGMF