Some interesting Blazars observed by AGILE
Valerio Vittorini (INAF-IASF Roma)
on behalf of the AGILE Team
and A. Paggi, A. Cavaliere (Univ. Tor Vergata)
AGN model
Jet: jet-frame ( ) beamed, non thermal radiation
External: cosmological frame (z) radiation connected with accretion
Electron distribution ne(;b) and magnetic field Bproduce
Synchrotron + Inverse Compton (SSC)
External photons N’ext and ne(b) produce External Compton (EC)
Synchrotron
External Compton
Self-Compton
Contribution to the SED
tdel
Synchrotron
External Compton
Self-Compton
Variability patterns
rs=sF(s;t) / sF(s;t0)
rc=cF(c;t+tdel) / cF(c;t0+tdel)
tdel
Synchrotron
External Compton
Self-Compton
Variability pattern: 0716+714
SSC signature!!
tdel
The remarkable BL Lac 0716+714 (z=0.31) Sept - Oct 2007
• A very prominent BL Lac (S.Wagner et al. 1996; U. Bach et al. 2005)
• OVV
• Weak or absent disk component (no lines)
• BH mass uncertain, in the range 108-109 Msun
• detected by AGILE several times, including two of the strongest gamma-ray flare (so far) from a BL Lac
PKS 0716+714
AGILE-GRID, Sept. 2007
The remarkable BL Lac 0716+714 (z=0.31)
Sept - Oct 2007
1) rvs ropt argues for SSC.
2) We need two components to account for the -flare and the complex
multi-band variability (see also Giommi et al. 08).
3) The day duration constraints
R < 5e16 (/20) cm, whereas
the very intense and hard spectrum and
the relative peaks position in the SED
require a II component with b > 6e3and 15.
4) The total jet power in the jet-frame
P = LB + Lkin + Lrad
exceeds 3e45 erg s-1cm-2
.
Figs. by Chen et al. 2008
SED
Two components with
different and b. (black line is the sum)
Standard one-zone model
Vittorini et al. 2009 to appear in ApJ
1) the hardness of the -spectrum
2) the faint variability in hard-X ray accompanied by strong variations in the radio, optical and soft-X ray fluxes
Argue for a two-components model (see, e.g., Tavecchio & Ghisellini 2009)
4x1045erg s-1
…that rises to 1046erg s-1 in the one component model
This is to be compared with the limit set by the Blandford-Znajek (1977) mechanism to the power extraction from a rotating BH:
Mrk 421
BL Lac
W Comae0716
Radiated luminosities
Observed fluxes
Courtesy of A. Paggi
and A. Cavaliere
The remarkable FSRQ 3C 454 (z=0.859) Dec 2007
1) The wide, sinultaneous frequency coverageconstrains very well the model.
2) This state shows a moderate and soft IR-
optical bump with a strong and hard -ray
3) Low electron energies ( 300) are required by IR-Optical, UV and X-ray data, despite of the hard -ray spectrum
4) This requires a further component of hot (T 106 oK) seed photons entering on-side into the jet, maybe the hot corona
Donnarumma et al. 2009 to appear in ApJ
The remarkable BL Lac 0716+714 (z=0.31) Sept - Oct 2007
1) rvs ropt argues for SSC.
2) We need two components to account for the -flare and the complex multi-band variability (see also Giommi et al. 08).
3) The day duration constraints R < 5e16 (/20) cm, whereas
the very intense and hard spectrum and the relative peaks
position in the SED require a II component with b > 6e3 and 15.
4) with these ingredients the total jet power P = LB + Lkin + Lrad
exceeds 3e45 erg s-1cm-2 in the jet-frame.Figs. by Chen et al. 2008