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THE FIRST FERMI MUL...
THE FIRST FERMI MULTIFREQUENCY CAMPAIGN ON BL LACERTAE : CHARACTERIZING THE LOW-ACTIVITY STATE OF THE EPONYMOUS BLAZAR
- Article/chapterEnglish2011
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LIBRIS-ID:oai:DiVA.org:su-69111
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-69111URI
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https://doi.org/10.1088/0004-637X/730/2/101DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-32665URI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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authorCount :181
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QC 20110518
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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 components 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 the correlation of gamma rays with the optical flux monitored from the ground in 18 months. The SED may be described by a single-zone or a two-zone synchrotron self-Compton (SSC) model, but a hybrid SSC plus external radiation Compton model seems to be preferred based on the observed variability and the fact that it provides a fit closest to equipartition.
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Ackermann, M.
(author)
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Ajello, M.
(author)
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Antolini, E.
(author)
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Baldini, L.
(author)
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Ballet, J.
(author)
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Barbiellini, G.
(author)
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Bastieri, D.
(author)
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Bechtol, K.
(author)
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Bellazzini, R.
(author)
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Berenji, B.
(author)
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Blandford, R. D.
(author)
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Bonamente, E.
(author)
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Borgland, A. W.
(author)
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Bregeon, J.
(author)
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Brez, A.
(author)
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Brigida, M.
(author)
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Bruel, P.
(author)
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Buehler, R.
(author)
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Buson, S.
(author)
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Caliandro, G. A.
(author)
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Cameron, R. A.
(author)
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Cannon, A.
(author)
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Caraveo, P. A.
(author)
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Carrigan, S.
(author)
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Casandjian, J. M.
(author)
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Cecchi, C.
(author)
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Celik, Oe
(author)
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Charles, E.
(author)
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Chekhtman, A.
(author)
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Cheung, C. C.
(author)
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Chiang, J.
(author)
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Ciprini, S.
(author)
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Claus, R.
(author)
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Cohen-Tanugi, J.
(author)
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Conrad, JanStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)conrad
(author)
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Costamante, L.
(author)
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Cutini, S.
(author)
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Dermer, C. D.
(author)
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de Palma, F.
(author)
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Donato, D.
(author)
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do Couto e Silva, E.
(author)
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Drell, P. S.
(author)
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Dubois, R.
(author)
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Escande, L.
(author)
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Favuzzi, C.
(author)
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Fegan, S. J.
(author)
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Finke, J.
(author)
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Focke, W. B.
(author)
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Fortin, P.
(author)
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Frailis, M.
(author)
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Fukazawa, Y.
(author)
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Funk, S.
(author)
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Fusco, P.
(author)
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Gargano, F.
(author)
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Gasparrini, D.
(author)
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Gehrels, N.
(author)
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Germani, S.
(author)
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Giglietto, N.
(author)
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Giordano, F.
(author)
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Giroletti, M.
(author)
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Glanzman, T.
(author)
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Godfrey, G.
(author)
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Grenier, I. A.
(author)
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Guiriec, S.
(author)
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Hadasch, D.
(author)
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Hayashida, M.
(author)
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Hays, E.
(author)
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Hughes, R. E.
(author)
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Itoh, R.
(author)
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Johannesson, G.
(author)
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Johnson, A. S.
(author)
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Johnson, W. N.
(author)
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Kamae, T.
(author)
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Katagiri, H.
(author)
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Kataoka, J.
(author)
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Knoedlseder, J.
(author)
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Kuss, M.
(author)
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Lande, J.
(author)
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Larsson, StefanStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)slars
(author)
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Latronico, L.
(author)
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Lee, S. -H
(author)
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Garde, Maja LlenaStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)mgarde
(author)
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Longo, F.
(author)
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Loparco, F.
(author)
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Lott, B.
(author)
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Lovellette, M. N.
(author)
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Lubrano, P.
(author)
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Makeev, A.
(author)
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Mazziotta, M. N.
(author)
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McEnery, J. E.
(author)
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Mehault, J.
(author)
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Michelson, P. F.
(author)
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Mizuno, T.
(author)
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Monte, C.
(author)
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Monzani, M. E.
(author)
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Morselli, A.
(author)
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Moskalenko, I. V.
(author)
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Murgia, S.
(author)
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Nakamori, T.
(author)
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Naumann-Godo, M.
(author)
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Nishino, S.
(author)
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Nolan, P. L.
(author)
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Norris, J. P.
(author)
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Nuss, E.
(author)
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Ohsugi, T.
(author)
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Okumura, A.
(author)
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Omodei, N.
(author)
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Orlando, E.
(author)
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Ormes, J. F.
(author)
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Ozaki, M.
(author)
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Paneque, D.
(author)
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Panetta, J. H.
(author)
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Parent, D.
(author)
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Pelassa, V.
(author)
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Pepe, M.
(author)
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Pesce-Rollins, M.
(author)
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Piron, F.
(author)
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Porter, T. A.
(author)
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Raino, S.
(author)
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Rando, R.
(author)
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Razzano, M.
(author)
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Reimer, A.
(author)
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Reimer, O.
(author)
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Ritz, S.
(author)
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Roth, M.
(author)
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Sadrozinski, H. F. -W
(author)
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Sanchez, D.
(author)
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Sander, A.
(author)
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Schinzel, F. K.
(author)
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Sgro, C.
(author)
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Siskind, E. J.
(author)
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Smith, P. D.
(author)
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Sokolovsky, K. V.
(author)
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Spandre, G.
(author)
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Spinelli, P.
(author)
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Strickman, M. S.
(author)
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Suson, D. J.
(author)
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Takahashi, H.
(author)
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Tanaka, T.
(author)
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Thayer, J. B.
(author)
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Thayer, J. G.
(author)
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Thompson, D. J.
(author)
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Tibaldo, L.
(author)
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Torres, D. F.
(author)
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Tosti, G.
(author)
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Tramacere, A.
(author)
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Uehara, T.
(author)
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Usher, T. L.
(author)
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Vandenbroucke, J.
(author)
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Vasileiou, V.
(author)
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Vilchez, N.
(author)
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Vitale, V.
(author)
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Waite, A. P.
(author)
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Wallace, E.
(author)
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Wang, P.
(author)
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Winer, B. L.
(author)
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Wood, K. S.
(author)
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SUBYang, Z.
(author)
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Ylinen, TomiKTH,Fysik(Swepub:kth)u1vmovqg
(author)
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Ziegler, M.
(author)
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Berdyugin, A.
(author)
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Boettcher, M.
(author)
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Carraminana, A.
(author)
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Carrasco, L.
(author)
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de la Fuente, E.
(author)
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Diltz, C.
(author)
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Hovatta, T.
(author)
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Kadenius, V.
(author)
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Kovalev, Y. Y.
(author)
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Lahteenmaki, A.
(author)
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Lindfors, E.
(author)
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Marscher, A. P.
(author)
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Nilsson, K.
(author)
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Pereira, D.
(author)
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Reinthal, R.
(author)
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Roustazadeh, P.
(author)
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Savolainen, T.
(author)
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Sillanpaa, A.
(author)
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Takalo, L. O.
(author)
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Tornikoski, M.
(author)
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et al, et al
(author)
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Stockholms universitetFysikum
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In:Astrophysical Journal730:2, s. 101-0004-637X1538-4357
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Abdo, A. A.
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Ackermann, M.
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Ajello, M.
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Antolini, E.
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Baldini, L.
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Ballet, J.
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Barbiellini, G.
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Bastieri, D.
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Bechtol, K.
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Blandford, R. D.
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Bonamente, E.
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Borgland, A. W.
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Bregeon, J.
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Brez, A.
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Brigida, M.
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Bruel, P.
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Buehler, R.
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Buson, S.
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Caliandro, G. A.
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Casandjian, J. M ...
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Fusco, P.
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Gasparrini, D.
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Germani, S.
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Giglietto, N.
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Giordano, F.
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Giroletti, M.
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Glanzman, T.
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Godfrey, G.
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Grenier, I. A.
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Guiriec, S.
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Hadasch, D.
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Hays, E.
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Hughes, R. E.
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Itoh, R.
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Johannesson, G.
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Johnson, A. S.
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Michelson, P. F.
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Mizuno, T.
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Omodei, N.
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Orlando, E.
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Ormes, J. F.
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Ozaki, M.
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Waite, A. P.
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Wallace, E.
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Wang, P.
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Winer, B. L.
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Wood, K. S.
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SUBYang, Z.
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Ylinen, Tomi
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Ziegler, M.
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Berdyugin, A.
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Boettcher, M.
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Carraminana, A.
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Carrasco, L.
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de la Fuente, E.
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Diltz, C.
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Hovatta, T.
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Kadenius, V.
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Kovalev, Y. Y.
-
Lahteenmaki, A.
-
Lindfors, E.
-
Marscher, A. P.
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Nilsson, K.
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Pereira, D.
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Reinthal, R.
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Roustazadeh, P.
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Savolainen, T.
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Sillanpaa, A.
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Takalo, L. O.
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et al, et al
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