Transcript 0716+714 sept07

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
External:
Jet:
cosmological frame (z)
radiation connected with accretion
jet-frame ( G )
beamed, non thermal radiation
Electron distribution
ne(g;gb)
and magnetic field
B
produce
Synchrotron + Inverse Compton (SSC)
External photons N’ext and
ne(g;gb)
produce
External Compton (EC)
Synchrotron
Self-Compton
tdel
Contribution
to the SED
External Compton
Synchrotron
Variability patterns
Self-Compton
tdel
External Compton
rs=esF(es;t) / esF(es;t0)
rc=ecF(ec;t+tdel) / ecF(ec;t0+tdel)
Synchrotron
Self-Compton
SSC signature!!
Variability pattern: 0716+714
tdel
External Compton
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) rg vs ropt argues for SSC.
2) We need two components to account
for the g-flare and the complex
multi-band variability
(see also Giommi et al. 08).
3) The day duration constraints
R < 5e16 (d/20) cm, whereas
the very intense and hard g spectrum and
the relative peaks position in the SED
require a II component with gb >
and G
6e3
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
1) the hardness of the g-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)
Standard one-zone model
Two components with
different G and gb.
(black line is the sum)
Vittorini et al. 2009 to appear in ApJ
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:
BL Lac
Mrk 421
Observed g fluxes
0716
W Comae
Radiated luminosities
Courtesy of A. Paggi
and A. Cavaliere
The remarkable FSRQ
3C 454
(z=0.859) Dec 2007
1) The wide, sinultaneous frequency coverage
constrains very well the model.
2) This state shows a moderate and soft IRoptical bump with a strong and hard g-ray
3) Low electron energies (g 300) are required
by IR-Optical, UV and X-ray data, despite of
the hard g-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) rg vs ropt argues for SSC.
2) We need two components to account for the g-flare and the
complex multi-band variability (see also Giommi et al. 08).
3) The day duration constraints R < 5e16 (d/20) cm, whereas
the very intense and hard g spectrum and the relative peaks
position in the SED require a II component with gb >
Figs. by Chen et al. 2008
6e3 and G 15.
4) with these ingredients the total jet power P = LB + Lkin + Lrad
exceeds 3e45 erg s-1cm-2 in the jet-frame.