Almost every galaxy hosts a BH 99% are silent 1% are active 0.1% have jets Extragalactic jets: a new perspective G. Ghisellini in coll. with F. Tavecchio INAF-OABrera
FRI-FRII & Blazars
Synchro Inverse Compton (also possible hadronic models) Radio IR Opt UV X MeV GeV Blazars: Spectral Energy Distribution
Fossati et al. 1998; Donato et al The “blazar sequence” FSRQs BL Lacs LBL and HBL
Fossati et al. 1998; Donato et al peak B 2
By modeling, we find physical parameters in the comoving frame. peak is the energy of electrons emitting at the peak of the SED EGRET blazars TeV BL Lacs
Low power slow cooling large peak Big power fast cooling small peak
Power of jets in blazars …and X-ray cavities, Allen+, 2006, Balmaverde+, 2008
Power of jets in blazars Tavecchio Celotti, GG 2001
Power of jets in blazars
P r = radiation P e = relat. electrons P p = protons P B = B-field R The power of blazar jets R diss ~10 17 cm
Ghisellini, Foschini, Tavecchio, Pian 2007 AGILE! 3C Swift
If one p per e- Relat. electrons Magnetic Field Radiation Celotti & Ghisellini 2007 High power P o w e r f u l j e t s a r e n o t m a g n e t i c a l l y d o m i n a t e d Celotti GG 2008
Celotti GG 2008, Maraschi et al P jet 10x 100x
Disk accretion rate (Eddington units) L disk P jet L disk P jet Jet power vs disk Lum. e-p decoupling Photon trapping BL Lacs, FSRQ, QSO GRBs
Pause Jet power is large. More than L diskJet power is large. More than L disk Matter dominated. Not many pairsMatter dominated. Not many pairs P B is smallP B is small Powerful jets must be radiatively inefficientPowerful jets must be radiatively inefficient Powerful jets do not deceleratePowerful jets do not decelerate
A new blazar sequence Old one: based on 1 parameter: the observed luminosity Now: info on mass and accretion rate (spin? not yet) Info on jet power vs disk luminosity Info on location of dissipation: must be at some distance from BH. One zone is dominant (internal shocks?)
The key ideas R diss proportional to M BH R BLR proportional to (L disk ) U BLR =cost For L disk /L Edd < L c no BLR (BL Lacs) 1/2
Ledlow & Owen Ghisellini & Celotti 2001
The key ideas R diss proportional to M BH R BLR proportional to (L disk ) U BLR =cost For L disk /L Edd < L c no BLR (BL Lacs) P B = B P jet B propto R -1 P e = e P jet 1/2
P B = B P jet B propto R -1 P e = e P jet Celotti & Ghisellini 2008
The key ideas R diss proportional to M BH R BLR proportional to (L disk ) U BLR =cost For L disk /L Edd < L c no BLR (BL Lacs) P B = B P jet B propto R -1 P e = e P jet peak propto U -1 ; U -1/2 1/2
The key ideas R diss proportional to M BH R BLR proportional to (L disk ) For L disk /L Edd < L c no BLR (BL Lacs) P B = B P jet P e = e P jet peak propto U -1 ; U -1/2 The key ansatz P jet always proportional to M 1/2
M2 M2 M2 M2 M ADAF (Narayan et al.) P jet propto L disk 1/2
Simple consequences R diss propto M; R BLR propto (L disk ) 1/2R diss propto M; R BLR propto (L disk ) 1/2 BLR Low M, High L disk Red quasar High M, Low L disk Blue quasar
Simple consequences Small M, small P jet, large B, redSmall M, small P jet, large B, red BLR U BLR ~ the same Large U B
Synchrotron peak frequency
Inverse Compton peak frequency
Compton dominance
Give me M BH and L disk (or L BLR ) and I will tell you the SED of the jet and its power Reproducing the “old” sequence
Conclusions P jet > L diskP jet > L disk Jets are matter dominatedJets are matter dominated Link between M, M and observed SEDLink between M, M and observed SED “Blue” FSRQs may exist“Blue” FSRQs may exist “Red” low power FSRQs may exist“Red” low power FSRQs may exist Implications about evolutionImplications about evolution GLAST + Swift + M + L disk (or L BLR )GLAST + Swift + M + L disk (or L BLR )
Fossati et al. 1998; Donato et al AGILE GLAST CT Swift