Simultaneous multi-wavelength campaign on PKS 2005-489 in a high state
Abstract
The high-frequency peaked BL Lac object PKS 2005-489 was the target of a multi-wavelength campaign with simultaneous observations in the TeV gamma-ray (H.E.S.S.), GeV gamma-ray (Fermi/LAT), X-ray (RXTE, Swift), UV (Swift) and optical (ATOM, Swift) bands. This campaign was carried out during a high flux state in the synchrotron regime. The flux in the optical and X-ray bands reached the level of the historical maxima. The hard GeV spectrum observed with Fermi/LAT connects well to the very high energy (VHE, E>100GeV) spectrum measured with H.E.S.S. with a peak energy between ~5 and 500 GeV. Compared to observations with contemporaneous coverage in the VHE and X-ray bands in 2004, the X-ray flux was ~50 times higher during the 2009 campaign while the TeV gamma-ray flux shows marginal variation over the years. The spectral energy distribution during this multi-wavelength campaign was fit by a one zone synchrotron self-Compton model with a well determined cutoff in X-rays. The parameters of a one zone SSC model are inconsistent with variability time scales. The variability behaviour over years with the large changes in synchrotron emission and small changes in the inverse Compton emission does not warrant an interpretation within a one-zone SSC model despite an apparently satisfying fit to the broadband data in 2009.
Keywords
Cite
@article{arxiv.1111.3331,
title = {Simultaneous multi-wavelength campaign on PKS 2005-489 in a high state},
author = {The H. E. S. S. Collaboration and the Fermi LAT Collaboration and : and A. Abramowski and F. Acero and F. Aharonian and A. G. Akhperjanian and G. Anton and A. Barnacka and U. Barres de Almeida and A. R. Bazer-Bachi and Y. Becherini and J. Becker and B. Behera and K. Bernlöhr and A. Bochow and C. Boisson and J. Bolmont and P. Bordas and V. Borrel and J. Brucker and F. Brun and P. Brun and T. Bulik and I. Büsching and S. Casanova and M. Cerruti and P. M. Chadwick and A. Charbonnier and R. C. G. Chaves and A. Cheesebrough and L. -M. Chounet and A. C. Clapson and G. Coignet and J. Conrad and M. Dalton and M. K. Daniel and I. D. Davids and B. Degrange and C. Deil and H. J. Dickinson and A. Djannati-Ataï and W. Domainko and L. O'C. Drury and F. Dubois and G. Dubus and J. Dyks and M. Dyrda and K. Egberts and P. Eger and P. Espigat and L. Fallon and C. Farnier and S. Fegan and F. Feinstein and M. V. Fernandes and A. Fiasson and G. Fontaine and A. Förster and M. Füßling and S. Gabici and Y. A. Gallant and H. Gast and L. Gérard and D. Gerbig and B. Giebels and J. F. Glicenstein and B. Glück and P. Goret and D. Göring and J. D. Hague and D. Hampf and M. Hauser and S. Heinz and G. Heinzelmann and G. Henri and G. Hermann and J. A. Hinton and A. Hoffmann and W. Hofmann and P. Hofverberg and D. Horns and A. Jacholkowska and O. C. de Jager and C. Jahn and M. Jamrozy and I. Jung and M. A. Kastendieck and K. Katarzyński and U. Katz and S. Kaufmann and D. Keogh and M. Kerschhaggl and D. Khangulyan and B. Khélifi and D. Klochkov and W. Kluźniak and T. Kneiske and Nu. Komin and K. Kosack and R. Kossakowski and H. Laffon and G. Lamanna and J. -P. Lenain and D. Lennarz and T. Lohse and A. Lopatin and C. -C. Lu and V. Marandon and A. Marcowith and J. Masbou and D. Maurin and N. Maxted and T. J. L. McComb and M. C. Medina and J. Méhault and N. Nguyen and R. Moderski and E. Moulin and M. Naumann-Godo and M. de Naurois and D. Nedbal and D. Nekrassov and B. Nicholas and J. Niemiec and S. J. Nolan and S. Ohm and J-F. Olive and E. de Oña Wilhelmi and B. Opitz and M. Ostrowski and M. Panter and M. Paz Arribas and G. Pedaletti and G. Pelletier and P. -O. Petrucci and S. Pita and G. Pühlhofer and M. Punch and A. Quirrenbach and M. Raue and S. M. Rayner and A. Reimer and O. Reimer and M. Renaud and R. de los Reyes and F. Rieger and J. Ripken and L. Rob and S. Rosier-Lees and G. Rowell and B. Rudak and C. B. Rulten and J. Ruppel and F. Ryde and V. Sahakian and A. Santangelo and R. Schlickeiser and F. M. Schöck and A. Schönwald and U. Schwanke and S. Schwarzburg and S. Schwemmer and A. Shalchi and M. Sikora and J. L. Skilton and H. Sol and G. Spengler and Ł. Stawarz and R. Steenkamp and C. Stegmann and F. Stinzing and I. Sushch and A. Szostek and P. H. Tam and J. -P. Tavernet and R. Terrier and O. Tibolla and M. Tluczykont and K. Valerius and C. van Eldik and G. Vasileiadis and C. Venter and J. P. Vialle and A. Viana and P. Vincent and M. Vivier and H. J. Völk and F. Volpe and S. Vorobiov and M. Vorster and S. J. Wagner and M. Ward and A. Wierzcholska and A. Zajczyk and A. A. Zdziarski and A. Zech and H. -S. Zechlin and A. A. Abdo and M. Ackermann and M. Ajello and L. Baldini and J. Ballet and G. Barbiellini and D. Bastieri and K. Bechtol and R. Bellazzini and B. Berenji and R. D. Blandford and E. Bonamente and A. W. Borgland and J. Bregeon and A. Brez and M. Brigida and P. Bruel and R. Buehler and S. Buson and G. A. Caliandro and R. A. Cameron and A. Cannon and P. A. Caraveo and S. Carrigan and J. M. Casandjian and E. Cavazzuti and C. Cecchi and Ö. Çelik and A. Chekhtman and C. C. Cheung and J. Chiang and S. Ciprini and R. Claus and J. Cohen-Tanugi and S. Cutini and C. D. Dermer and F. de Palma and E. do Couto e Silva and P. S. Drell and R. Dubois and D. Dumora and L. Escande and C. Favuzzi and E. C. Ferrara and W. B. Focke and P. Fortin and M. Frailis and Y. Fukazawa and P. Fusco and F. Gargano and D. Gasparrini and N. Gehrels and S. Germani and N. Giglietto and P. Giommi and F. Giordano and M. Giroletti and T. Glanzman and G. Godfrey and I. A. Grenier and J. E. Grove and S. Guiriec and D. Hadasch and E. Hays and D. Horan and R. E. Hughes and G. Jóhannesson and A. S. Johnson and W. N. Johnson and T. Kamae and H. Katagiri and J. Kataoka and J. Knödlseder and M. Kuss and J. Lande and L. Latronico and S. -H. Lee and F. Longo and F. Loparco and B. Lott and M. N. Lovellette and P. Lubrano and G. M. Madejski and A. Makeev and M. N. Mazziotta and W. McConville and J. E. McEnery and P. F. Michelson and T. Mizuno and C. Monte and M. E. Monzani and A. Morselli and I. V. Moskalenko and S. Murgia and T. Nakamori and S. Nishino and P. L. Nolan and J. P. Norris and E. Nuss and T. Ohsugi and A. Okumura and N. Omodei and E. Orlando and J. F. Ormes and M. Ozaki and D. Paneque and J. H. Panetta and D. Parent and V. Pelassa and M. Pepe and M. Pesce-Rollins and F. Piron and T. A. Porter and S. Rainò and R. Rando and M. Razzano and H. F. -W. Sadrozinski and D. Sanchez and A. Sander and C. Sgrò and E. J. Siskind and P. D. Smith and G. Spandre and P. Spinelli and M. S. Strickman and D. J. Suson and H. Takahashi and T. Takahashi and T. Tanaka and J. B. Thayer and J. G. Thayer and D. J. Thompson and L. Tibaldo and D. F. Torres and G. Tosti and A. Tramacere and E. Troja and T. Uehara and T. L. Usher and J. Vandenbroucke and G. Vianello and N. Vilchez and V. Vitale and A. P. Waite and P. Wang and B. L. Winer and K. S. Wood and Z. Yang and T. Ylinen and M. Ziegler},
journal= {arXiv preprint arXiv:1111.3331},
year = {2012}
}
Comments
published in A&A, 9pages, 4figures. Due to some style difficulties using the standard style file with the long author list, the abstract has been included manually. A version with the correct style can be found in the website http://www.lsw.uni-heidelberg.de/users/skaufman/publications/aa16170-10published.pdf