| dc.contributor.author | A. ABDO, A. |  | 
| dc.contributor.author | ACKERMANN, Markus |  | 
| dc.contributor.author | AJELLO, Marco |  | 
| dc.contributor.author | ANTOLINI, E. |  | 
| dc.contributor.author | BALDINI, Luca |  | 
| hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] |  | 
| dc.contributor.author | BALLET, Jean |  | 
| dc.contributor.author | BARBIELLINI, Guido |  | 
| dc.contributor.author | BASTIERI, D. |  | 
| dc.contributor.author | BECHTOL, K. |  | 
| dc.contributor.author | BELLAZZINI, R. |  | 
| dc.contributor.author | BERENJI, B. |  | 
| dc.contributor.author | D. BLANDFORD, R. |  | 
| dc.contributor.author | BONAMENTE, E. |  | 
| dc.contributor.author | W. BORGLAND, A. |  | 
| dc.contributor.author | BREGEON, J. |  | 
| dc.contributor.author | BREZ, A. |  | 
| dc.contributor.author | BRIGIDA, M. |  | 
| hal.structure.identifier | Laboratoire Leprince-Ringuet [LLR] |  | 
| dc.contributor.author | BRUEL, Pascal |  | 
| dc.contributor.author | BUEHLER, R. |  | 
| dc.contributor.author | BUSON, S. |  | 
| dc.contributor.author | A. CALIANDRO, G. |  | 
| dc.contributor.author | A. CAMERON, R. |  | 
| dc.contributor.author | CANNON, A. |  | 
| dc.contributor.author | CARAVEO, P. A. |  | 
| dc.contributor.author | CARRIGAN, S. |  | 
| hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] |  | 
| dc.contributor.author | M. CASANDJIAN, J. |  | 
| dc.contributor.author | CECCHI, C. |  | 
| dc.contributor.author | ÇELIK, Ö. |  | 
| dc.contributor.author | CHARLES, E. |  | 
| dc.contributor.author | CHEKHTMAN, A. |  | 
| dc.contributor.author | C. CHEUNG, C. |  | 
| dc.contributor.author | CHIANG, J. |  | 
| dc.contributor.author | CIPRINI, S. |  | 
| dc.contributor.author | CLAUS, R. |  | 
| hal.structure.identifier | Laboratoire de Physique Théorique et Astroparticules [LPTA] |  | 
| dc.contributor.author | COHEN-TANUGI, J. |  | 
| dc.contributor.author | CONRAD, J. |  | 
| dc.contributor.author | COSTAMANTE, L. |  | 
| dc.contributor.author | CUTINI, S. |  | 
| dc.contributor.author | D. DERMER, C. |  | 
| dc.contributor.author | DE PALMA, F. |  | 
| dc.contributor.author | DONATO, D. |  | 
| dc.contributor.author | DO COUTO E SILVA, E. |  | 
| dc.contributor.author | S. DRELL, P. |  | 
| dc.contributor.author | DUBOIS, R. |  | 
| hal.structure.identifier | Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG] |  | 
| dc.contributor.author | ESCANDE, L. |  | 
| dc.contributor.author | FAVUZZI, C. |  | 
| hal.structure.identifier | Laboratoire Leprince-Ringuet [LLR] |  | 
| dc.contributor.author | J. FEGAN, S. |  | 
| dc.contributor.author | FINKE, J. |  | 
| dc.contributor.author | B. FOCKE, W. |  | 
| hal.structure.identifier | Laboratoire Leprince-Ringuet [LLR] |  | 
| dc.contributor.author | FORTIN, P. |  | 
| dc.contributor.author | FRAILIS, M. |  | 
| dc.contributor.author | FUKAZAWA, Y. |  | 
| dc.contributor.author | FUNK, S. |  | 
| dc.contributor.author | FUSCO, P. |  | 
| dc.contributor.author | GARGANO, F. |  | 
| dc.contributor.author | GASPARRINI, D. |  | 
| dc.contributor.author | GEHRELS, N. |  | 
| dc.contributor.author | GERMANI, S. |  | 
| dc.contributor.author | GIGLIETTO, N. |  | 
| dc.contributor.author | GIORDANO, F. |  | 
| dc.contributor.author | GIROLETTI, M. |  | 
| dc.contributor.author | GLANZMAN, T. |  | 
| dc.contributor.author | GODFREY, G. |  | 
| hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] |  | 
| dc.contributor.author | A. GRENIER, I. |  | 
| dc.contributor.author | GUIRIEC, S. |  | 
| dc.contributor.author | HADASCH, D. |  | 
| dc.contributor.author | HAYASHIDA, M. |  | 
| dc.contributor.author | HAYS, E. |  | 
| dc.contributor.author | E. HUGHES, R. |  | 
| dc.contributor.author | ITOH, R. |  | 
| dc.contributor.author | JÓHANNESSON, G. |  | 
| dc.contributor.author | S. JOHNSON, A. |  | 
| dc.contributor.author | N. JOHNSON, W. |  | 
| dc.contributor.author | KAMAE, T. |  | 
| dc.contributor.author | KATAGIRI, H. |  | 
| dc.contributor.author | KATAOKA, J. |  | 
| hal.structure.identifier | Centre d'étude spatiale des rayonnements [CESR] |  | 
| dc.contributor.author | KNÖDLSEDER, Jürgen |  | 
| dc.contributor.author | KUSS, M. |  | 
| dc.contributor.author | LANDE, J. |  | 
| dc.contributor.author | LARSSON, S. |  | 
| dc.contributor.author | LATRONICO, L. |  | 
| dc.contributor.author | LEE, S.-H. |  | 
| dc.contributor.author | LLENA GARDE, M. |  | 
| dc.contributor.author | LONGO, F. |  | 
| dc.contributor.author | LOPARCO, F. |  | 
| hal.structure.identifier | Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG] |  | 
| dc.contributor.author | LOTT, B. |  | 
| dc.contributor.author | N. LOVELLETTE, M. |  | 
| dc.contributor.author | LUBRANO, P. |  | 
| dc.contributor.author | MAKEEV, A. |  | 
| dc.contributor.author | N. MAZZIOTTA, M. |  | 
| dc.contributor.author | E. MCENERY, J. |  | 
| hal.structure.identifier | Laboratoire de Physique Théorique et Astroparticules [LPTA] |  | 
| dc.contributor.author | MEHAULT, J. |  | 
| dc.contributor.author | F. MICHELSON, P. |  | 
| dc.contributor.author | MIZUNO, T. |  | 
| dc.contributor.author | MONTE, C. |  | 
| dc.contributor.author | E. MONZANI, M. |  | 
| dc.contributor.author | MORSELLI, A. |  | 
| dc.contributor.author | V. MOSKALENKO, I. |  | 
| dc.contributor.author | MURGIA, S. |  | 
| dc.contributor.author | NAKAMORI, T. |  | 
| hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] |  | 
| dc.contributor.author | NAUMANN-GODO, M. |  | 
| dc.contributor.author | NISHINO, S. |  | 
| dc.contributor.author | L. NOLAN, P. |  | 
| dc.contributor.author | P. NORRIS, J. |  | 
| hal.structure.identifier | Laboratoire de Physique Théorique et Astroparticules [LPTA] |  | 
| dc.contributor.author | NUSS, E. |  | 
| dc.contributor.author | OHSUGI, T. |  | 
| dc.contributor.author | OKUMURA, A. |  | 
| dc.contributor.author | OMODEI, N. |  | 
| dc.contributor.author | ORLANDO, E. |  | 
| dc.contributor.author | F. ORMES, J. |  | 
| dc.contributor.author | OZAKI, M. |  | 
| dc.contributor.author | PANEQUE, D. |  | 
| dc.contributor.author | H. PANETTA, J. |  | 
| hal.structure.identifier | Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG] |  | 
| dc.contributor.author | PARENT, D. |  | 
| hal.structure.identifier | Laboratoire de Physique Théorique et Astroparticules [LPTA] |  | 
| dc.contributor.author | PELASSA, V. |  | 
| dc.contributor.author | PEPE, M. |  | 
| dc.contributor.author | PESCE-ROLLINS, M. |  | 
| hal.structure.identifier | Laboratoire de Physique Théorique et Astroparticules [LPTA] |  | 
| dc.contributor.author | PIRON, F. |  | 
| dc.contributor.author | PORTER, T.A. |  | 
| dc.contributor.author | RAINÒ, S. |  | 
| dc.contributor.author | RANDO, R. |  | 
| dc.contributor.author | RAZZANO, M. |  | 
| dc.contributor.author | REIMER, A. |  | 
| dc.contributor.author | REIMER, O. |  | 
| dc.contributor.author | RITZ, S. |  | 
| dc.contributor.author | ROTH, M. |  | 
| dc.contributor.author | F.-W. SADROZINSKI, H. |  | 
| hal.structure.identifier | Laboratoire Leprince-Ringuet [LLR] |  | 
| dc.contributor.author | SANCHEZ, D. |  | 
| dc.contributor.author | SANDER, A. |  | 
| dc.contributor.author | K. SCHINZEL, F. |  | 
| dc.contributor.author | SGRÒ, C. |  | 
| dc.contributor.author | J. SISKIND, E. |  | 
| dc.contributor.author | D. SMITH, P. |  | 
| dc.contributor.author | V. SOKOLOVSKY, K. |  | 
| dc.contributor.author | SPANDRE, G. |  | 
| dc.contributor.author | SPINELLI, P. |  | 
| dc.contributor.author | S. STRICKMAN, M. |  | 
| dc.contributor.author | J. SUSON, D. |  | 
| dc.contributor.author | TAKAHASHI, H. |  | 
| dc.contributor.author | TANAKA, T. |  | 
| dc.contributor.author | B. THAYER, J. |  | 
| dc.contributor.author | G. THAYER, J. |  | 
| dc.contributor.author | J. THOMPSON, D. |  | 
| hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] |  | 
| dc.contributor.author | TIBALDO, L. |  | 
| dc.contributor.author | F. TORRES, D. |  | 
| dc.contributor.author | TOSTI, G. |  | 
| dc.contributor.author | TRAMACERE, A. |  | 
| dc.contributor.author | UEHARA, T. |  | 
| dc.contributor.author | L. USHER, T. |  | 
| dc.contributor.author | VANDENBROUCKE, J. |  | 
| dc.contributor.author | VASILEIOU, V. |  | 
| hal.structure.identifier | Centre d'étude spatiale des rayonnements [CESR] |  | 
| dc.contributor.author | VILCHEZ, N. |  | 
| dc.contributor.author | VITALE, V. |  | 
| dc.contributor.author | P. WAITE, A. |  | 
| dc.contributor.author | WALLACE, E. |  | 
| dc.contributor.author | WANG, P. |  | 
| dc.contributor.author | L. WINER, B. |  | 
| dc.contributor.author | S. WOOD, K. |  | 
| dc.contributor.author | YANG, Z. |  | 
| dc.contributor.author | YLINEN, T. |  | 
| dc.contributor.author | ZIEGLER, M. |  | 
| dc.contributor.author | BERDYUGIN, A. |  | 
| dc.contributor.author | BOETTCHER, M. |  | 
| dc.contributor.author | CARRAMIÑANA, A. |  | 
| dc.contributor.author | CARRASCO, L. |  | 
| dc.contributor.author | DE LA FUENTE, E. |  | 
| dc.contributor.author | DILTZ, C. |  | 
| dc.contributor.author | HOVATTA, T. |  | 
| dc.contributor.author | KADENIUS, V. |  | 
| dc.contributor.author | KOVALEV, Y.Y. |  | 
| dc.contributor.author | LÄHTEENMÄKI, A. |  | 
| dc.contributor.author | LINDFORS, E. |  | 
| dc.contributor.author | P. MARSCHER, A. |  | 
| dc.contributor.author | NILSSON, K. |  | 
| dc.contributor.author | PEREIRA, D. |  | 
| dc.contributor.author | REINTHAL, R. |  | 
| dc.contributor.author | ROUSTAZADEH, P. |  | 
| dc.contributor.author | SAVOLAINEN, T. |  | 
| dc.contributor.author | SILLANPÄÄ, A. |  | 
| dc.contributor.author | O. TAKALO, L. |  | 
| dc.contributor.author | TORNIKOSKI, M. |  | 
| dc.date.issued | 2011-04-01 |  | 
| dc.identifier.issn | 0004-637X |  | 
| dc.description.abstractEn | We report on observations of BL Lacertae during the first 18 months of Fermi-LAT science operations and present results from a 48-day multifrequency coordinated campaign from 2008 August 19 to 2008 October 7. The radio to gamma-ray behavior of BL Lac is unveiled during a low activity state thanks to the coordinated observations of radio-band (Metsahovi and VLBA), near-IR/optical (Tuorla, Steward, OAGH and MDM) and X-ray (RXTE and Swift) observatories. No variability was resolved in gamma-rays during the campaign, and the brightness level was 15 times lower than the level of the 1997 EGRET outburst. Moderate and uncorrelated variability has been detected in UV and X-rays. The X-ray spectrum is found to be concave indicating the transition region between the low and high energy component of the spectral energy distribution (SED). VLBA observation detected a synchrotron spectrum self-absorption turnover in the innermost part of the radio jet appearing to be elongated and inhomogeneous, and constrained the average magnetic field there to be less than 3 G. Over the following months BL Lac appeared variable in gamma-rays, showing flares (in 2009 April and 2010 January). There is no evidence for correlation of the gamma-rays with the optical flux monitored from the ground in 18 months. The SED may be described by a single zone or two zone synchrotron self-Compton (SSC) model, but a hybrid SSC plus external radiation Compton (ERC) model seems preferred based on the observed variability and the fact that it provides a fit closest to equipartition. |  | 
| dc.language.iso | en |  | 
| dc.publisher | American Astronomical Society |  | 
| dc.subject.en | BL Lacertae objects: general |  | 
| dc.subject.en | BL Lacertae objects: individual (BL Lacertae) |  | 
| dc.subject.en | galaxies: jets |  | 
| dc.subject.en | gamma rays: galaxies |  | 
| dc.subject.en | radiation mechanisms: non-thermal |  | 
| dc.subject.en | X-rays: galaxies |  | 
| dc.title.en | The first Fermi multifrequency campaign on BL Lacertae: characterizing the low-activity state of the eponymous blazar |  | 
| dc.type | Article de revue |  | 
| dc.identifier.doi | 10.1088/0004-637X/730/2/101 |  | 
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph]/Phénomènes cosmiques de haute energie [astro-ph.HE] |  | 
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Phénomènes cosmiques de haute energie [astro-ph.HE] |  | 
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO] |  | 
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO] |  | 
| dc.identifier.arxiv | 1101.5905 |  | 
| bordeaux.journal | The Astrophysical Journal |  | 
| bordeaux.page | 101 |  | 
| bordeaux.volume | 730 |  | 
| bordeaux.peerReviewed | oui |  | 
| hal.identifier | in2p3-00587827 |  | 
| hal.version | 1 |  | 
| hal.popular | non |  | 
| hal.audience | Non spécifiée |  | 
| hal.origin.link | https://hal.archives-ouvertes.fr//in2p3-00587827v1 |  | 
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=The%20Astrophysical%20Journal&rft.date=2011-04-01&rft.volume=730&rft.spage=101&rft.epage=101&rft.eissn=0004-637X&rft.issn=0004-637X&rft.au=A.%20ABDO,%20A.&ACKERMANN,%20Markus&AJELLO,%20Marco&ANTOLINI,%20E.&BALDINI,%20Luca&rft.genre=article |  |