1 / 15

AGILE Observations of Interesting Blazars: AGN Model and Variability Patterns

This study presents AGILE observations of notable blazars focusing on the AGN model in a cosmological frame, discussing radiation mechanisms like Synchrotron, Inverse Compton, and External Compton. It also analyzes variability patterns and components contributing to the spectral energy distribution. The findings highlight the need for a two-component model to explain complex variability, g-flares, and jet powers exceeding 3e45 erg s-1cm-2. Various blazars like BL Lac0716+714 and FSRQ 3C 454 are examined in detail.

ira-levy
Download Presentation

AGILE Observations of Interesting Blazars: AGN Model and Variability Patterns

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 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)

  2. AGN model External: cosmological frame (z) radiation connected with accretion Jet: jet-frame ( G ) beamed, non thermal radiation Electron distributionne(g;gb)and magnetic fieldB produce Synchrotron + Inverse Compton (SSC) External photons N’ext and ne(g;gb)produce External Compton (EC)

  3. Self-Compton Synchrotron tdel Contribution to the SED External Compton

  4. Self-Compton Synchrotron tdel Variability patterns rs=esF(es;t) / esF(es;t0) rc=ecF(ec;t+tdel) / ecF(ec;t0+tdel) External Compton

  5. Self-Compton Synchrotron SSC signature!! Variability pattern: 0716+714 tdel External Compton

  6. The remarkable BL Lac0716+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

  7. PKS 0716+714

  8. AGILE-GRID, Sept. 2007

  9. The remarkable BL Lac0716+714(z=0.31) Sept - Oct 2007 1) rg vs roptargues 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 withgb > 6e3 and G 15. 4)The total jet power in the jet-frame P = LB + Lkin + Lrad exceeds3e45 erg s-1cm-2 . Figs. by Chen et al. 2008

  10. 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 differentGandgb. (black line is the sum) Vittorini et al. 2009 to appear in ApJ

  11. 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: Observed g fluxes BL Lac Mrk 421 0716 W Comae Courtesy of A. Paggi and A. Cavaliere Radiated luminosities

  12. 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 IR-optical 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 106oK) seed photons entering on-side into the jet, maybe the hot corona Donnarumma et al. 2009 to appear in ApJ

  13. The remarkable BL Lac0716+714(z=0.31) Sept - Oct 2007 1)rg vs roptargues 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 constraintsR < 5e16 (d/20) cm, whereas the very intense and hard g spectrum and the relative peaks position in the SED require a II component withgb > 6e3 and G 15. 4) with these ingredients the total jet power P = LB + Lkin + Lrad exceeds3e45 erg s-1cm-2 in the jet-frame. Figs. by Chen et al. 2008

More Related