Blazars: the gamma-ray view of AGILE

1. Blazars: the gamma-ray view of AGILE Filippo D’Ammando 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

2. AGILE flaring blazars and paper list 44th Reconstres de Moriond Filippo D’Ammando 4 February 2009

3. AGILEflaring blazarssky distribution Most of the sources lie in the Northern Hemisphere Several AGILE detection triggered by northern-based telescopes 44th Reconstres de Moriond Filippo D’Ammando 4 February 2009

4. 9 - 13 July 2007 First AGILE multi-λ campaign: 3C 279 Giuliani, D’Ammando, Vercellone, et al., A&A in press First extragalactic source detected by AGILE-GRID, monitored simultaneously in optical by REM telescope and in X-rays by Swift <Fg> = (210  38) 10-8 ph cm-2 s-1 E > 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 D’Ammando 4 February 2009

5. 23 August - 1 September 2007 PKS 1510 - 089 Pucella, Vittorini, D’Ammando, et al. 2008, A&A, 491, L21 <Fg> = (195  30) 10-8 ph cm-2 s-1 E >100 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 D’Ammando 4 February 2009

6. 17 - 21 March 2008 PKS 1510-089: a rapid gamma-ray flare in March 2008 D’Ammando 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 D’Ammando 4 February 2009

7. 4 - 23 September 2007 S5 0716+714 in September - October 2007 Chen, D’Ammando, Villata, et al. 2008, A&A, 489, L37 <Fg> = (97  15) 10-8 ph cm-2 s-1 E >100 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 > 3 x 1045 erg s-1) To fit the SED we use two SSC components 44th Reconstres de Moriond Filippo D’Ammando 4 February 2009

8. 23 October - 13 November 2007 Swift and AGILE simultaneous observations in October - November 2007 Giommi, Colafrancesco, Cutini, et al., 2008, A&A, 487, L49 <Fg> = ( 47 ± 11 ) 10-8 ph cm-2 s-1 E >100 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 D’Ammando 4 February 2009

9. 16 December 2007 – 8 January 2008 3C 273: simultaneous detection by GRID & SA Pacciani, Donnarumma, Vittorini, et al., A&A, 494, 49 <Fg> = (22  6) 10-8 ph cm-2 s-1 E >100 MeV Fg [peak] = (33 11) 10-8 ph cm-2s-1 E >100 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 D’Ammando 4 February 2009

10. 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 <Fg> = (280 ± 40) 10-8 ph cm-2 s-1 E >100 MeV Highest gamma-ray flux from this source (published … but see Fermi: ATel #1628) 44th Reconstres de Moriond Filippo D’Ammando 4 February 2009

11. MW Observations of 3C 454.3 in November 2007 10 November - 1 December 2007 Vercellone, Chen, Vittorini, et al. 2009, ApJ, 690, 1018 <Fg> = (170  13) 10-8 ph cm-2 s-1 E >100 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 D’Ammando 4 February 2009

12. 1 - 16 December 2007 3C 454.3: December 2007 campaign Donnarumma et al., in preparation Multi-λ campaign with the contribution of Spitzer, REM, WEBT, MITSuME, Swift, Suzaku and AGILE <Fg> ~ 250 x 10-8 ph cm-2s-1 E > 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 D’Ammando 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 D’Ammando 4 February 2009

14. Mrk 421: WEBT + AGILE + VERITAS + MAGIC = … 44th Reconstres de Moriond Filippo D’Ammando 4 February 2009

15. Mrk 421 from optical to TeV energies Donnarumma et al., 2009, ApJ 691, L13 <Fg> = (42 ± 13) 10-8 ph cm-2 s-1 E >100 MeV Swift/XRT: Flux (2 - 10 keV) = 2.6 x 10-9ph 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

16. 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 D’Ammando 4 February 2009

17. 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 D’Ammando 4 February 2009