Workshop on Blazar Variability across the Electromagnetic Spectrum

It has been known for a long time that blazars are variable, both on short (minutes to days) and long (weeks to years) timescales. Various models exist to explain the mechanisms causing variability, and disentangling them has also been particularly hard. A wide variety of tools are used to define and characterize variability, with varying limitations depending on the analysis method and observation uniformity. We plan to have several wavelength-dependent review talks about variability of blazars, ranging from radio to Very High Energy wavelengths, with a special emphasis on Atmospheric Cherenkov Telescope results - and possibly from GLAST - where the timescales have been the shortest. A better view of their fluctuations and power spectra, flare asymmetries in lightcurves, their possible intrinsic or extrinsic origin, as well as different talks on analysis methods strengths and limitations. The main objective of the meeting is to have a view across the spectrum of what the relevant characteristics are (timescales, power distributions), their correlations, the caveats of their assessment, and what underlying physics can realistically be probed with the current generation of instruments.

Sessions
Session1: The blazar paradigm
Session 2: The soft side
Session 3: The hard side
Session 4: Analysis tools
Session 5: Mechanisms at play and their inherent variability
Session 6: Future instruments and measurements
Poster

Session1: The blazar paradigm

Blazars: the broadband observational point of view PoS(BLAZARS2008)001 A. Celotti

Implications of VHE emission in Gamma-Ray AGN PoS(BLAZARS2008)002 pdf A. Levinson

Pair cascades in AGN PoS(BLAZARS2008)003 J. Poutanen

Can short variability time scales be reconciled with hadronic emission PoS(BLAZARS2008)004 K. Mannheim

Session 2: The soft side

VLBA observations of Blazars PoS(BLAZARS2008)005 pdf S. Jorstad

VLBI polarisation variability and implications for jet models PoS(BLAZARS2008)006 D. GABUZDA

Total intensity radio variations in blazars PoS(BLAZARS2008)007 pdf E. Valtaoja

Variability of blazars in the IR-optical-UV energy bands: observational facts PoS(BLAZARS2008)008 G. Tosti

Thermal AGN signatures in blazars PoS(BLAZARS2008)009 pdf E. Perlman

Session 3: The hard side

Long-term X-ray variability in Blazars and its multiwaveband context PoS(BLAZARS2008)010 pdf A. Marscher

GeV gamma-ray variability PoS(BLAZARS2008)011 J. McEnery

Variability of VHE gamma-ray blazars PoS(BLAZARS2008)012 W. Benbow

TeV/X-ray correlated variability in blazars (optical, radio) PoS(BLAZARS2008)013 pdf R. Wagner

Session 4: Analysis tools

Explaining X-ray Variability in Blazars PoS(BLAZARS2008)014 pdf I. McHardy

Characterizing X-ray variability of blazars PoS(BLAZARS2008)015 pdf J. Kataoka

The emission of blazars in VHE gamma-rays viewed as a random stationary process: the case of PKS 2155-304 PoS(BLAZARS2008)016 pdf B. Degrange

Session 5: Mechanisms at play and their inherent variability

Particle acceleration, shocks, reconnection... PoS(BLAZARS2008)017 J. Kirk

A unified time-dependent view of relativistic jets PoS(BLAZARS2008)018 G. Henri

Multiwavelength synchrotron/Compton spectral analysis of TeV blazars and FSRQs: a new approach PoS(BLAZARS2008)019 pdf C. Dermer

Radiative outputs of blazars PoS(BLAZARS2008)020 R. Moderski

Variability and propagation effects PoS(BLAZARS2008)021 S. Wagner

Unification scenarios: the case of M87 PoS(BLAZARS2008)022 pdf H. Sol

Session 6: Future instruments and measurements

The next generation of X-ray sensitive observatories and their potential for blazar variability studies PoS(BLAZARS2008)023 G. Madejski

Strengths and limitations of Atmospheric Cherenkov Telescopes (ACTs) - Present and Future - for transient VHE sources PoS(BLAZARS2008)024 M. Punch

What have we learned? Outstanding questions... PoS(BLAZARS2008)025 pdf P. Kaaret

Poster

ESO VLT optical spectroscopy of BL Lac objects PoS(BLAZARS2008)026 pdf A. Treves

Probing the Jet Physics of TeV Blazars PoS(BLAZARS2008)027 pdf U. Barres de Almeida

M87 PoS(BLAZARS2008)028 pdf K. Berger, D. Mazin, D. Tescaro and R. Wagner

Multi band optical micro variability of BL Lac objects PoS(BLAZARS2008)029 pdf E.P. Christopoulou, E.M Xilouris, P Boumis and I.E. Papadakis

OJ 287 colors during a multifrequency campaign PoS(BLAZARS2008)030 pdf S. Ciprini

L Band (20cm) Radio Analysis of WARPS Galaxy Clusters PoS(BLAZARS2008)031 C. Coffey

Optical Variability Monitoring for Gamma ray Blazars: preliminary results PoS(BLAZARS2008)032 pdf J.A. Combi, I. Andruchow, S.A. Cellone, G.E. Romero, J. Martí , A. Munoz- Arjonilla and J. Sanchez-Sutil

AGILE detection of a strong gamma ray flare from the blazar S5 0716 714 during September-October 2007 PoS(BLAZARS2008)033 pdf F. D'Ammando, A.W. Chen, M. Villata, C.M. Raiteri, V. Vittorini, A. Bulgarelli, I. Donnarumma, A. Giuliani, F. Longo, L. Pacciani, G. Pucella, M. Tavani and S. Vercellone

injection of electron with red noise light curve PoS(BLAZARS2008)034 pdf D. Sanchez

Optical polarization variability in TeV BL Lacs PoS(BLAZARS2008)035 pdf T. Dominici, Z. Abraham, A. Pereyra and A.M. Magalhães

Multi wavelenth observations of PG 1553 113 PoS(BLAZARS2008)036 pdf attachments D. Dorner

Infrared polarimetry of 3C454 3 during a flare PoS(BLAZARS2008)037 pdf G. Dubus and S. Chaty

The nonlinear long term X ray variability of Mrk 421 PoS(BLAZARS2008)038 pdf D. Emmanoulopoulos

The AGN Monitoring Program with the Whipple 10m Observatory PoS(BLAZARS2008)039 pdf L. Fortson and J. Kildea

Variability on Decaparsec scales of a number of BL Lac objects PoS(BLAZARS2008)040 pdf R. Hallahan and D. GABUZDA

Long term radio variability of AGN PoS(BLAZARS2008)041 pdf T. Hovatta, M. Tornikoski, H.J. Lehto, E. Nieppola, E. Valtaoja, M. Lainela, I. Torniainen, A. Lahteenmaki, M.F. Aller and H.D. Aller

Observations of blazars by the ESA INTEGRAL satellite PoS(BLAZARS2008)042 pdf R. Hudec

VRIJHK photometry of PKS 0537-441 and PKS 2155-304 in 2006-2008 PoS(BLAZARS2008)043 pdf D. Impiombato

X ray spectral variability of TeV Blazars PoS(BLAZARS2008)044 pdf S. Kaufmann and S. Wagner

The ten years optical study of ESS and TeV samples of BL Lacertae objects PoS(BLAZARS2008)045 O. Kurtanidze

discovery of VHE gamma rays from RGB J0152 017 PoS(BLAZARS2008)046 pdf J.P. Lenain, D. Nedbal, M. Raue, S. Kaufmann, L. Gérard, M. Hauser and B. Giebels

Optically Triggered Target of Opportunity Observations with the MAGIC Telescope PoS(BLAZARS2008)047 pdf E. Lindfors

Roma BZCAT: a Multifrequency Blazar catalogue PoS(BLAZARS2008)048 pdf A. Maselli

The Timescales of the Optical Variability of 3C454 3 PoS(BLAZARS2008)049 H.R. Miller

Stability of magnetized spine sheath relativistic jets PoS(BLAZARS2008)050 pdf Y. Mizuno

Blazar sequence: the effect of Doppler correction PoS(BLAZARS2008)052 pdf E. Nieppola

Radiation from relativistic jets PoS(BLAZARS2008)053 pdf K.I. Nishikawa and Y. Mizuno

Observation of Gamma Ray Variability of 3C 273 with AGILE during the MWL campaign of Dec 2007 PoS(BLAZARS2008)054 pdf L. Pacciani, I. Donnarumma, V. Vittorini, F. D'Ammando, G. Pucella, M. Tavani, D. Impiombato, M.T. Fiocchi, G. Stratta, F. Verrecchia, A. Bulgarelli, A. Chen, A. Giuliani, S. Vercellone, F. Longo, G. Barbiellini, M. Feroci, E. Costa, P. Soffitta, E. Del Monte, Y. Evangelista, F. Lazzarotto, I. Lapshov, M. Rapisarda and G. Di Cocco

Last results from the WEBT and GASP PoS(BLAZARS2008)055 pdf C.M. Raiteri and M. Villata

XMM Newton Observations of Low Energy Peaked BL Lac Objects PoS(BLAZARS2008)056 pdf J. Randall

VERITAS Observations of Mrk 421 with Simultaneous Coverage in the X ray Band PoS(BLAZARS2008)057 pdf L. Reyes

Possible variability signatures of Supermassive Binary Black Holes in Blazars PoS(BLAZARS2008)058 pdf F.M. Rieger

Swift Observations of emission line radio loud AGN PoS(BLAZARS2008)059 R. Sambruna

Multicolor polarimetric observation of 15 min variability in S5 0716 714 PoS(BLAZARS2008)060 pdf M. Sasada

Suzaku observation of TeV blazar 1ES 1218 304: clues on particle acceleration in an extreme TeV blazar PoS(BLAZARS2008)061 pdf R. Sato

Large amplitude intraday variability in 1156 295 observed during a VLBI experiment PoS(BLAZARS2008)062 pdf T. Savolainen and Y. Kovalev

Suzaku observation of the OJ 287, Quiescence and Predicted flare in 2007 PoS(BLAZARS2008)063 pdf H. Seta

Mkn 501 Binary black holes as source of Variability PoS(BLAZARS2008)064 F. Spanier

Lobster Eye X ray Monitor and Blazars PoS(BLAZARS2008)065 pdf I. Sujova

Temporal Variability Study of the BL Lac object PKS2155 304 with H E S S PoS(BLAZARS2008)066 pdf G. Superina

Hard X ray observation of Fornax A west lobe with Suzaku PoS(BLAZARS2008)067 MAKOTO TASHIRO

A time dependent inhomogeneous stratified jet model applied to TeV blazar PKS 2155 304 PoS(BLAZARS2008)068 B. Timothé

Longterm multi wavelength variability of 3C 273 PoS(BLAZARS2008)069 pdf M. Turler, S. Soldi, S. Paltani and T.J.L. Courvoisier

Simultaneous optical infrared polarimetry of blazars with TRISPEC/KANATA PoS(BLAZARS2008)070 pdf M. Uemura

Modelling the Delayed Emission in the 2005 Mkn 501 Flare PoS(BLAZARS2008)071 pdf R. Wagner and W. Bednarek

The Perugia variability monitoring of blazars PoS(BLAZARS2008)072 pdf S. Ciprini

Analytical and numerical time-dependent modelling of SSC blazars variability PoS(BLAZARS2008)073 pdf S. Ciprini

Long term VHE gamma ray monitoring of bright blazars with a dedicated Cherenkov telescope PoS(BLAZARS2008)074 pdf T. Bretz, M. Backes, I. Braun and D. Dorner

The International High Energy Astrophysics Multiwavelength Coordination Wiki PoS(BLAZARS2008)075 L. Fortson

Very long term observations of blazars candidates for supermassive black hole binaries PoS(BLAZARS2008)076 pdf R. Hudec

Multifrequency observation of VLBL objects PoS(BLAZARS2008)077 pdf A. Maselli

Communicate with the PoS Editorial Office