2011ApJ...727..129A

Query : 2011ApJ...727..129A

2011ApJ...727..129A - Astrophys. J., 727, 129 (2011/February-1)

Insights into the high-energy γ-ray emission of Markarian 501 from extensive multifrequency observations in the Fermi era.

ABDO A.A., ACKERMANN M., AJELLO M., ALLAFORT A., BALDINI L., BALLET J., BARBIELLINI G., BARING M.G., BASTIERI D., BECHTOL K., BELLAZZINI R., BERENJI B., BLANDFORD R.D., BLOOM E.D., BONAMENTE E., BORGLAND A.W., BOUVIER A., BRANDT T.J., BREGEON J., BREZ A., BRIGIDA M., BRUEL P., BUEHLER R., BUSON S., CALIANDRO G.A., CAMERON R.A., CANNON A., CARAVEO P.A., CARRIGAN S., CASANDJIAN J.M., CAVAZZUTI E., CECCHI C., CELIK O., CHARLES E., CHEKHTMAN A., CHEUNG C.C., CHIANG J., CIPRINI S., CLAUS R., COHEN-TANUGI J., CONRAD J., CUTINI S., DERMER C.D., DE PALMA F., DO COUTO E SILVA E., DRELL P.S., DUBOIS R., DUMORA D., FAVUZZI C., FEGAN S.J., FERRARA E.C., FOCKE W.B., FORTIN P., FRAILIS M., FUHRMANN L., FUKAZAWA Y., FUNK S., FUSCO P., GARGANO F., GASPARRINI D., GEHRELS N., GERMANI S., GIGLIETTO N., GIORDANO F., GIROLETTI M., GLANZMAN T., GODFREY G., GRENIER I.A., GUILLEMOT L., GUIRIEC S., HAYASHIDA M., HAYS E., HORAN D., HUGHES R.E., JOHANNESSON G., JOHNSON A.S., JOHNSON W.N., KADLER M., KAMAE T., KATAGIRI H., KATAOKA J., KNODLSEDER J., KUSS M., LANDE J., LATRONICO L., LEE S.-H., LEMOINE-GOUMARD M., LONGO F., LOPARCO F., LOTT B., LOVELLETTE M.N., LUBRANO P., MADEJSKI G.M., MAKEEV A., MAX-MOERBECK W., MAZZIOTTA M.N., McENERY J.E., MEHAULT J., MICHELSON P.F., MITTHUMSIRI W., MIZUNO T., MOISEEV A.A., MONTE C., MONZANI M.E., MORSELLI A., MOSKALENKO I.V., MURGIA S., NAUMANN-GODO M., NISHINO S., NOLAN P.L., NORRIS J.P., NUSS E., OHSUGI T., OKUMURA A., OMODEI N., ORLANDO E., ORMES J.F., PANEQUE D., PANETTA J.H., PARENT D., PAVLIDOU V., PEARSON T.J., PELASSA V., PEPE M., PESCE-ROLLINS M., PIRON F., PORTER T.A., RAINO S., RANDO R., RAZZANO M., READHEAD A., REIMER A., REIMER O., RICHARDS J.L., RIPKEN J., RITZ S., ROTH M., SADROZINSKI H.F.-W., SANCHEZ D., SANDER A., SCARGLE J.D., SGRO C., SISKIND E.J., SMITH P.D., SPANDRE G., SPINELLI P., STAWARZ L., STEVENSON M., STRICKMAN M.S., SOKOLOVSKY K.V., SUSON D.J., TAKAHASHI H., TAKAHASHI T., TANAKA T., THAYER J.B., THAYER J.G., THOMPSON D.J., TIBALDO L., TORRES D.F., TOSTI G., TRAMACERE A., UCHIYAMA Y., USHER T.L., VANDENBROUCKE J., VASILEIOU V., VILCHEZ N., VITALE V., WAITE A.P., WANG P., WEHRLE A.E., WINER B.L., WOOD K.S., YANG Z., YLINEN T., ZENSUS J.A., ZIEGLER M. (The Fermi-LAT Collaboration), ALEKSIC J., ANTONELLI L.A., ANTORANZ P., BACKES M., BARRIO J.A., BECERRA GONZALEZ J., BEDNAREK W., BERDYUGIN A., BERGER K., BERNARDINI E., BILAND A., BLANCH O., BOCK R.K., BOLLER A., BONNOLI G., BORDAS P., BORLA TRIDON D., BOSCH-RAMON V., BOSE D., BRAUN I., BRETZ T., CAMARA M., CARMONA E., CAROSI A., COLIN P., COLOMBO E., CONTRERAS J.L., CORTINA J., COVINO S., DAZZI F., DE ANGELIS A., DE CEA DEL POZO E., DE LOTTO B., DE MARIA M., DE SABATA F., DELGADO MENDEZ C., DIAGO ORTEGA A., DOERT M., DOMINGUEZ A., DOMINIS PRESTER D., DORNER D., DORO M., ELSAESSER D., FERENC D., FONSECA M.V., FONT L., GARCIA LOPEZ R.J., GARCZARCZYK M., GAUG M., GIAVITTO G., GODINOVIC N., HADASCH D., HERRERO A., HILDEBRAND D., HOHNE-MONCH D., HOSE J., HRUPEC D., JOGLER T., KLEPSER S., KRAHENBUHL T., KRANICH D., KRAUSE J., LA BARBERA A., LEONARDO E., LINDFORS E., LOMBARDI S., LOPEZ M., LORENZ E., MAJUMDAR P., MAKARIEV E., MANEVA G., MANKUZHIYIL N., MANNHEIM K., MARASCHI L., MARIOTTI M., MARTINEZ M., MAZIN D., MEUCCI M., MIRANDA J.M., MIRZOYAN R., MIYAMOTO H., MOLDON J., MORALEJO A., NIETO D., NILSSON K., ORITO R., OYA I., PAOLETTI R., PAREDES J.M., PARTINI S., PASANEN M., PAUSS F., PEGNA R.G., PEREZ-TORRES M.A., PERSIC M., PERUZZO J., POCHON J., PRADA MORONI P.G., PRADA F., PRANDINI E., PUCHADES N., PULJAK I., REICHARDT I., REINTHAL R., RHODE W., RIBO M., RICO J., RISSI M., RUGAMER S., SAGGION A., SAITO K., SAITO T.Y., SALVATI M., SANCHEZ-CONDE M., SATALECKA K., SCALZOTTO V., SCAPIN V., SCHULTZ C., SCHWEIZER T., SHAYDUK M., SHORE S.N., SIERPOWSKA-BARTOSIK A., SILLANPAA A., SITAREK J., SOBCZYNSKA D., SPANIER F., SPIRO S., STAMERRA A., STEINKE B., STORZ J., STRAH N., STRUEBIG J.C., SURIC T., TAKALO L.O., TAVECCHIO F., TEMNIKOV P., TERZIC T., TESCARO D., TESHIMA M., VANKOV H., WAGNER R.M., WEITZEL Q., ZABALZA V., ZANDANEL F., ZANIN R. (The MAGIC Collaboration), ACCIARI V.A., ARLEN T., AUNE T., BENBOW W., BOLTUCH D., BRADBURY S.M., BUCKLEY J.H., BUGAEV V., CANNON A., CESARINI A., CIUPIK L., CUI W., DICKHERBER R., ERRANDO M., FALCONE A., FINLEY J.P., FINNEGAN G., FORTSON L., FURNISS A., GALANTE N., GALL D., GILLANDERS G.H., GODAMBE S., GRUBE J., GUENETTE R., GYUK G., HANNA D., HOLDER J., HUANG D., HUI C.M., HUMENSKY T.B., KAARET P., KARLSSON N., KERTZMAN M., KIEDA D., KONOPELKO A., KRAWCZYNSKI H., KRENNRICH F., LANG M.J., MAIER G., McARTHUR S., McCANN A., McCUTCHEON M., MORIARTY P., MUKHERJEE R., ONG R., OTTE A.N., PANDEL D., PERKINS J.S., PICHEL A., POHL M., QUINN J., RAGAN K., REYES L.C., REYNOLDS P.T., ROACHE E., ROSE H.J., ROVERO A.C., SCHROEDTER M., SEMBROSKI G.H., SENTURK G.D., STEELE D., SWORDY S.P., TESIC G., THEILING M., THIBADEAU S., VARLOTTA A., VINCENT S., WAKELY S.P., WARD J.E., WEEKES T.C., WEINSTEIN A., WEISGARBER T., WILLIAMS D.A., WOOD M., ZITZER B. (The VERITAS Collaboration), VILLATA M., RAITERI C.M., ALLER H.D., ALLER M.F., ARKHAROV A.A., BLINOV D.A., CALCIDESE P., CHEN W.P., EFIMOVA N.V., KIMERIDZE G., KONSTANTINOVA T.S., KOPATSKAYA E.N., KOPTELOVA E., KURTANIDZE O.M., KURTANIDZE S.O., LAHTEENMAKI A., LARIONOV V.M., LARIONOVA E.G., LARIONOVA L.V., LIGUSTRI R., MOROZOVA D.A., NIKOLASHVILI M.G., SIGUA L.A., TROITSKY I.S., ANGELAKIS E., CAPALBI M., CARRAMINANA A., CARRASCO L., CASSARO P., DE LA FUENTE E., GURWELL M.A., KOVALEV Y.Y., KOVALEV Yu.A., KRICHBAUM T.P., KRIMM H.A., LETO P., LISTER M.L., MACCAFERRI G., MOODY J.W., MORI Y., NESTORAS I., ORLATI A., PAGANI C., PACE C., PEARSON R., PERRI M., PINER B.G., PUSHKAREV A.B., ROS E., SADUN A.C., SAKAMOTO T., TORNIKOSKI M., YATSU Y. and ZOOK A.

Abstract (from CDS):

We report on the γ-ray activity of the blazar Mrk 501 during the first 480 days of Fermi operation. We find that the average Large Area Telescope (LAT) γ-ray spectrum of Mrk 501 can be well described by a single power-law function with a photon index of 1.78±0.03. While we observe relatively mild flux variations with the Fermi-LAT (within less than a factor of two), we detect remarkable spectral variability where the hardest observed spectral index within the LAT energy range is 1.52±0.14, and the softest one is 2.51±0.20. These unexpected spectral changes do not correlate with the measured flux variations above 0.3 GeV. In this paper, we also present the first results from the 4.5 month long multifrequency campaign (2009 March 15–August 1) on Mrk 501, which included the Very Long Baseline Array (VLBA), Swift, RXTE, MAGIC, and VERITAS, the F-GAMMA, GASP-WEBT, and other collaborations and instruments which provided excellent temporal and energy coverage of the source throughout the entire campaign. The extensive radio to TeV data set from this campaign provides us with the most detailed spectral energy distribution yet collected for this source during its relatively low activity. The average spectral energy distribution of Mrk 501 is well described by the standard one-zone synchrotron self-Compton (SSC) model. In the framework of this model, we find that the dominant emission region is characterized by a size ≲ 0.1 pc (comparable within a factor of few to the size of the partially resolved VLBA core at 15-43 GHz), and that the total jet power (≃1044 erg/s) constitutes only a small fraction (∼10–3) of the Eddington luminosity. The energy distribution of the freshly accelerated radiating electrons required to fit the time-averaged data has a broken power-law form in the energy range 0.3 GeV-10 TeV, with spectral indices 2.2 and 2.7 below and above the break energy of 20 GeV. We argue that such a form is consistent with a scenario in which the bulk of the energy dissipation within the dominant emission zone of Mrk 501 is due to relativistic, proton-mediated shocks. We find that the ultrarelativistic electrons and mildly relativistic protons within the blazar zone, if comparable in number, are in approximate energy equipartition, with their energy dominating the jet magnetic field energy by about two orders of magnitude.

Abstract Copyright: ∼

Journal keyword(s): acceleration of particles - BL Lacertae objects: general - BL Lacertae objects: individual: Mrk 501 - galaxies: active - gamma rays: general - radiation mechanisms: non-thermal

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
2 Z 184-50 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2841 1
3 4C 38.41 Bla 16 35 15.49297809 +38 08 04.5005995   18.14 17.97 17.25   ~ 906 1
4 3C 345 Bla 16 42 58.80997043 +39 48 36.9939552   16.81 16.59 16.84   ~ 1808 3
5 Z 225-7 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2304 2
6 6C 170807+432136 Bla 17 09 41.08658310 +43 18 44.5325307   19.99 19.25 19.67   ~ 113 2
7 7C 172226.89+400715.00 BLL 17 24 05.42881867 +40 04 36.4570720   21.90   19.75   ~ 106 1
8 7C 173240.70+385949.00 BLL 17 34 20.57853650 +38 57 51.4430945   19.5 19 19.00   ~ 232 1
9 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 3004 2

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