Diapositiva 1

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Blazars the gamma-ray view of AGILE
Filippo DAmmando
Università degli Studi di Roma Tor Vergata INAF
- Istituto di Astrofisica Spaziale e Fisica
Cosmica Roma
on behalf of the AGILE WG-AGN
44th Recontres de Moriond, 1 - 8 February 2009
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AGILE flaring blazars and paper list
44th Reconstres de Moriond
Filippo DAmmando
4 February 2009
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Most of the sources lie in the Northern
Hemisphere Several AGILE detection triggered by
northern-based telescopes
AGILE flaring blazars sky distribution
44th Reconstres de Moriond
Filippo DAmmando
4 February 2009
4
First AGILE multi-? campaign 3C 279
Giuliani, DAmmando, Vercellone, et al., AA in
press First extragalactic source detected by
AGILE-GRID, monitored simultaneously in optical
by REM telescope and in X-rays by Swift ltFggt
(210 ? 38) 10-8 ph cm-2 s-1 E gt 100
MeV Gamma-ray flux similar to the EGRET high
state Soft spectrum during a flaring episode,
could be an indication of a dominant contribution
of EDC emission compared to ECC emission model
44th Reconstres de Moriond
Filippo DAmmando
4 February 2009
5
PKS 1510 - 089
Pucella, Vittorini, DAmmando, et al. 2008, AA,
491, L21 ltFggt (195 ? 30) 10-8 ph cm-2 s-1 E
gt100 MeV Possible correlation between optical and
gamma-ray bands contemporaneous decrease in
fluxes The IC contribution from the BLR can
explain the observed hard gamma-ray spectrum
44th Reconstres de Moriond
Filippo DAmmando
4 February 2009
6
PKS 1510-089 a rapid gamma-ray flare in March
2008
DAmmando et al., in preparation Serendipitous
detection during an AGILE pointing towards the
Galactic Center 3 ToO by Swift/XRT the spectrum
becomes harder when the source is
brighter GASP-WEBT observed intense optical
activity between January and April 2008
44th Reconstres de Moriond
Filippo DAmmando
4 February 2009
7
S5 0716714 in September - October 2007
Chen, DAmmando, Villata, et al. 2008, AA, 489,
L37 ltFggt (97 ? 15) 10-8 ph cm-2 s-1 E gt100
MeV with a peak level of (193 ? 42) 10-8 ph cm-2
s-1 z 0.31 ? 0.08 (Nilsson et al., 2008) Total
power transported in the jet is extremely high (
Ltot gt 3 x 1045 erg s-1) To fit the SED we use
two SSC components
44th Reconstres de Moriond
Filippo DAmmando
4 February 2009
8
Swift and AGILE simultaneous observations in
October - November 2007
Giommi, Colafrancesco, Cutini, et al., 2008, AA,
487, L49 ltFggt ( 47 11 ) 10-8 ph cm-2 s-1 E
gt100 MeV The g-ray flux about a factor of 2 lower
than in September Strong variability in soft
X-ray, moderate at optical/UV and approximately
constant in hard X-ray The SED is consistent with
a two-component SSC model
44th Reconstres de Moriond
Filippo DAmmando
4 February 2009
9
3C 273 simultaneous detection by GRID SA

Pacciani, Donnarumma, Vittorini, et al., AA,
494, 49 ltFggt (22 ? 6) 10-8 ph cm-2 s-1 E
gt100 MeV Fg peak (33 ?11) 10-8 ph cm-2s-1 E
gt100 MeV Multi-l campaign REM, Swift, RXTE,
INTEGRAL and AGILE Indication of an
anti-correlated variability between X-rays and
gamma-rays SSC EC spectral variability
consistent with an acceleration episode of the
electron population
44th Reconstres de Moriond
Filippo DAmmando
4 February 2009
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3C 454.3 July 2007
24 - 30 July 2007
Vercellone, Chen, Giuliani, et al, 2008, ApJL,
676, 13 AGILE repointing the source during a
period of strongly enhanced optical emission ltFggt
(280 40) 10-8 ph cm-2 s-1 E gt100 MeV Highest
gamma-ray flux from this source (published but
see Fermi ATel 1628)
44th Reconstres de Moriond
Filippo DAmmando
4 February 2009
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Vercellone, Chen, Vittorini, et al. 2009, ApJ,
690, 1018 ltFggt (170 ? 13) 10-8 ph cm-2 s-1 E
gt100 MeV Emission in the optical range appears to
be correlated with that at gamma-ray energies
The gamma-ray emission is dominated by inverse
Compton scattering of the external photons from
the broad line region clouds
44th Reconstres de Moriond
Filippo DAmmando
4 February 2009
12
3C 454.3 December 2007 campaign
Donnarumma et al., in preparation Multi-?
campaign with the contribution of Spitzer, REM,
WEBT, MITSuME, Swift, Suzaku and AGILE ltFggt
250 x 10-8 ph cm-2 s-1 E gt 100 MeV The SED seems
to require external Compton of seed photons from
a hot corona with T 106 K
44th Reconstres de Moriond
Filippo DAmmando
4 February 2009
13
W Comae a ToO triggered by VERITAS

This source belongs to an AGILE Guest
Investigator E. Pian The results of a
multi-wavelength campaign involving WEBT, Swift,
AGILE and VERITAS will be published (Acciari et
al., in preparation)
44th Reconstres de Moriond
Filippo DAmmando
4 February 2009
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Mrk 421 WEBT AGILE VERITAS MAGIC
44th Reconstres de Moriond
Filippo DAmmando
4 February 2009
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Mrk 421 from optical to TeV energies
Donnarumma et al., 2009, ApJ 691, L13 ltFggt (42
13) 10-8 ph cm-2 s-1 E gt100 MeV Swift/XRT
Flux (2 - 10 keV) 2.6 x 10-9 ph cm-2
s-1 Possible correlated variability between
optical, X-rays and high-energy parts of the
spectrum SSC model hardening/softening of
electron energy distribution caused by particle
acceleration process
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Other papers in preparation

• PKS 0537-441 October 2008 flare
• 3C 454.3 One year of AGILE monitoring
• Detailed analysis of Virgo region
• Two articles on theoretical models for emission
  mechanisms in BL Lacs and FSRQs

44th Reconstres de Moriond
Filippo DAmmando
4 February 2009
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AGILE results on Blazars

• After 18 months, 7 flaring blazars detected by
  AGILE
• No blazar candidates flared above 100 MeV at a
  significance greater than 5-s (..but see Fermi
  GST)
• 6 other Blazars or Blazar candidates detected in
  the AGILE First Catalogue
• Multi-wavelength campaigns promptly activated
• 8 multi-l papers already out, several others
  very soon

44th Reconstres de Moriond
Filippo DAmmando
4 February 2009
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AGNs MW studies with AGILE
At the beginning of each observation block we
distribute the list of the AGNs in the field of
view of AGILE The AGILE pointing direction
and the sources within its field of view are
posted on the AGILE and ASDC web-sites http//agi
le.iasf-roma.inaf.it http//agile.asdc.asi.it You
can also contact the AGN WG coordinator for any
AGN request stefano_at_ifc.inaf.it