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Gamma-ray Large Area Space Telescope

This report presents findings from the science group on blazars and other active galactic nuclei (AGN) observed by the Gamma-ray Large Area Space Telescope. Topics include blazar studies, gamma-ray statistical properties, GLAST-detected blazars, extragalactic background light, and more. The report outlines anticipated papers, research objectives, simulation efforts, and participant contributions, aiming to advance understanding of these high-energy celestial phenomena.

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Gamma-ray Large Area Space Telescope

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  1. Gamma-ray Large Area Space Telescope Report on the “Blazar and Other AGN” Science Group Coordinators: P. Giommi & B. Lott

  2. Group members Grzegorz Madejski Enrico Massaro Julie McEnery Peter Michelson Guy Pelletier Carlotta Pittori Anita Reimer Thierry Reposeur Luis Reyes Steve Ritz Roger Romani Felix Ryde Antonio Saggion Jeff Scargle Eduardo do Couto e Silva David M Smith David A Smith Tadayuki Takahashi Greg Taylor Gino Tosti Rob Cameron Annalisa Celotti Alexandre Chekhtman Andrew Chen James Chiang Stefano Ciprini Lynn Cominsky Charles Dermer Jean Pascal Dezalay Yasushi Fukazawa Berrie Giebels Paolo Giommi J. Eric Grove Robert Hartman Tune Kamae Stefan Larsson Y. C. Lin Benoit Lott Pasquale Lubrano 39 people 25 attended at least one of the 4 VRVS +1 F2F meetings

  3. Table of anticipated papers year 1

  4. Blazar studies with the LAT 1st year and beyond 1. Blazar catalog, sample definition (identification) Association with known sources, identification via cross-correlation with radio, X-ray... catalogs, Statistical studies on the remaining subset 2. Gamma-ray statistical properties of the samples LogN-LogS, redshift distributions, luminosity function, cosmological evolution, population studies In addition to BL Lacs and FSRQs, Bright radio-galaxies and Radio-quiet AGNs Estimate of contribution of non-resolved blazars to the Extragalactic Diffuse Background 3. General properties of GLAST-detected blazars spectral and temporal properties: spectral index, spectral cutoffs, luminosity and spectral variability, duty cycle… Connection between g-ray activity and jet structure (VLBA) 4. Specific Properties of Individual Source (Multiwavelength campaigns) Study as a function of time: Epeak vs Flux, Epeak vs Index, Index vs Flux, spectral curvature, interband time lags… 5. Extragalactic Background Light It is anticipated that each topic will be the subject of (at least) one pre-launch paper.

  5. Towards an identification prescription for blazars Figure of Merit (fx,fR,aR) CGRaBS (~1000 sources) Romani et al. Blazar region aox-aro Multi-n blazar catalog Giommi et al.

  6. Multi Wavelength Observations • Pre-launch effort (more blazars expected than currently known) • - Multi-frequency blazar catalog (ASI) • CGRaBs: Candidate Gamma-Ray Blazars (Stanford) • “VIPS”: VLBA Imaging and Polarisation Survey • Completion of blazar catalog in southern hemisphere • (to be resubmitted) • Monitoring-ToO • Whole Earth Blazar Telescope • (1 telescope in Southern hemisphere…) • MW Campaigns • About 20 sources (preselected+ToO) • All wavelengths, from radio to TeV • - strategy • data policy • contacts!

  7. Sources of special interest (MW campaigns) This list is incomplete but growing! The scientific case for each of them must be spelled out.

  8. Blazar simulation effort Blazar simulation in the Science Tools environment: spectral_transient class in obssim (J. Chiang) any light curve can be input includes EBL attenuation (contributions from G. Tosti, J. McEnery, L. Reyes…) Real blazar catalogs (Romani’s, Giommi’s) are available as input to simulate a realistic sky. Blazar light curves (G. Tosti et al.) “Blazar sky” simulation (P. Giommi)

  9. Goals for DC2 1. Blazar catalog, sample definition Source Identification in collaboration with the Catalog Group 2. Gamma-ray statistical properties of the samples - LogN-LogS, redshift distributions, luminosity function - population studies: BL Lacs and FSRQs bright radio galaxies radio_quiet galaxies 3. General properties of GLAST-detected blazars - spectral index - spectral cutoffs - luminosity and spectral variability - duty cycle… 4. Specific Properties of Individual Source For the brightest sources: spectral evolution with time, flux non-simultaneous SEDs 5. Extragalactic Background Light Rough estimate of EBL density (if enough bright, high-redshift, high-energy sources…)

  10. DC2 participants from the Blazar perspective • SLAC: E. do Couto e Silva, G. Madejski, R. Cameron, B. Lott • Perugia: G. Tosti, P. Lubrano, S. Ciprini, A. Cucchiara, L. Furhmann • ASI: P. Giommi + 2 people • GSFC: L. Reyes • CENBG: Th. Reposeur 14 people at the moment

  11. Short-term activity (in addition to DC2) • Define the blazar identification prescription • Define and prioritize MW needs, develop strategy, establish contacts • Define list of “gold-plated” sources • Refine the strategy concerning EBL • Develop strategies and tools for variability analysis, transient detection • Revise and update Dermer & Davis estimates of blazar populations • Assess LAT capabilities from the blazar perspective (A. Buzzati, Eduardo’s student) Cen A z Reyes et al. Dermer & Davis

  12. Web pages Confluence page (password protected) Working space regular Web page must be refurbished soon (blazar community at large)

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