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