Multiwavelength observations of Mrk 501 in 2008

MAGIC Collaboration: J. Aleksi\'c (1) , S. Ansoldi (2) , L. A. Antonelli (3) , P. Antoranz (4) , A. Babic (5) , P. Bangale (6) , U. Barres de Almeida (6) , J. A. Barrio (7)

show 525 more authors

J. Becerra Gonz\'alez (8) W. Bednarek (9) K. Berger (8) E. Bernardini (10) A. Biland (11) O. Blanch (1) R. K. Bock (6) S. Bonnefoy (7) G. Bonnoli (3) F. Borracci (6) T. Bretz (12 25) E. Carmona (13) A. Carosi (3) D. Carreto Fidalgo (12) P. Colin (6) E. Colombo (8) J. L. Contreras (7) J. Cortina (1) S. Covino (3) P. Da Vela (4) F. Dazzi (2) A. De Angelis (2) G. De Caneva (10) B. De Lotto (2) C. Delgado Mendez (13) M. Doert (14) A. Dom\'inguez (15 26) D. Dominis Prester (5) D. Dorner (12) M. Doro (16) S. Einecke (14) D. Eisenacher (12) D. Elsaesser (12) E. Farina (17) D. Ferenc (5) M. V. Fonseca (7) L. Font (18) K. Frantzen (14) C. Fruck (6) R. J. Garc\'ia L\'opez (8) M. Garczarczyk (10) D. Garrido Terrats (18) M. Gaug (18) G. Giavitto (1) N. Godinovi\'c (5) A. Gonz\'alez Mu\~noz (1) S. R. Gozzini (10) A. Hadamek (14) D. Hadasch (19) A. Herrero (8) D. Hildebrand (11) J. Hose (6) D. Hrupec (5) W. Idec (9) V. Kadenius (20) H. Kellermann (6) M. L. Knoetig (11) J. Krause (6) J. Kushida (21) A. La Barbera (3) D. Lelas (5) N. Lewandowska (12) E. Lindfors (20 27) S. Lombardi (3) M. L\'opez (7) R. L\'opez-Coto (1) A. L\'opez-Oramas (1) E. Lorenz (6) I. Lozano (7) M. Makariev (22) K. Mallot (10) G. Maneva (22) N. Mankuzhiyil (2 *) K. Mannheim (12) L. Maraschi (3) B. Marcote (23) M. Mariotti (16) M. Mart\'inez (1) D. Mazin (6) U. Menzel (6) M. Meucci (4) J. M. Miranda (4) R. Mirzoyan (6) A. Moralejo (1) P. Munar-Adrover (23) D. Nakajima (21) A. Niedzwiecki (9) K. Nilsson (20 N. Nowak (6) R. Orito (21) A. Overkemping (14) S. Paiano (16) M. Palatiello (2) D. Paneque (6 R. Paoletti (4) J. M. Paredes (23) X. Paredes-Fortuny (23) S. Partini (4) M. Persic (2 28) F. Prada (15 29) P. G. Prada Moroni (24) E. Prandini (16) S. Preziuso (4) I. Puljak (5) R. Reinthal (20) W. Rhode (14) M. Rib\'o (23) J. Rico (1) J. Rodriguez Garcia (6) S. R\"ugamer (12) A. Saggion (16) T. Saito (21) K. Saito (21) M. Salvati (3) K. Satalecka (7 V. Scalzotto (16) V. Scapin (7) C. Schultz (16) T. Schweizer (6) S. N. Shore (24) A. Sillanp\"a\"a (20) J. Sitarek (1) I. Snidaric (5) D. Sobczynska (9) F. Spanier (12) V. Stamatescu (1) A. Stamerra (3) T. Steinbring (12) J. Storz (12) S. Sun (6) T. Suri\'c (5) L. Takalo (20) F. Tavecchio (3) P. Temnikov (22) T. Terzi\'c (5) D. Tescaro (8) M. Teshima (6) J. Thaele (14) O. Tibolla (12) D. F. Torres (19) T. Toyama (6) A. Treves (17) M. Uellenbeck (14) P. Vogler (11) R. M. Wagner (6 30) F. Zandanel (15 31) R. Zanin (23) VERITAS Collaboration: B. Behera (10) M. Beilicke (32) W. Benbow (33) K. Berger (34) R. Bird (35) A. Bouvier (36) V. Bugaev (32) M. Cerruti (33) X. Chen (37 L. Ciupik (38) E. Collins-Hughes (35) W. Cui (39) C. Duke (40) J. Dumm (41) A. Falcone (42) S. Federici (31 37) Q. Feng (39) J. P. Finley (39) L. Fortson (41) A. Furniss (36) N. Galante (33) G. H. Gillanders (43) S. Griffin (44) S. T. Griffiths (45) J. Grube (38) G. Gyuk (38) D. Hanna (44) J. Holder (34) C. A. Johnson (36) P. Kaaret (45) M. Kertzman (46) D. Kieda (47) H. Krawczynski (32) M. J. Lang (43) A. S Madhavan (48) G. Maier (10) P. Majumdar (49 50) K. Meagher (51) P. Moriarty (52) R. Mukherjee (53) D. Nieto (54) A. O'Faol\'ain de Bhr\'oithe (35) R. A. Ong (49) A. N. Otte (51) A. Pichel (55) M. Pohl (37 A. Popkow (49) H. Prokoph (10) J. Quinn (35) J. Rajotte (44) G. Ratliff (38) L. C. Reyes (56) P. T. Reynolds (57) G. T. Richards (51) E. Roache (33) G. H. Sembroski (39) K. Shahinyan (41) F. Sheidaei (47) A. W. Smith (47) D. Staszak (44) I. Telezhinsky (37 M. Theiling (39) J. Tyler (44) A. Varlotta (39) S. Vincent (10) S. P. Wakely (58) T. C. Weekes (33) R. Welsing (10) D. A. Williams (36) A. Zajczyk (32) B. Zitzer (59) External Collaborators: M. Villata (60) C. M. Raiteri (60) M. Ajello (61) M. Perri (62) H. D. Aller (63) M. F. Aller (63) V. M. Larionov (64 65 66) N. V. Efimova (64 65) T. S. Konstantinova (64) E. N. Kopatskaya (64) W. P. Chen (67) E. Koptelova (67 68) H. Y. Hsiao (67) O. M. Kurtanidze (69 70 79) M. G. Nikolashvili (69) G. N. Kimeridze (69) B. Jordan (71) P. Leto (72) C. S. Buemi (72) C. Trigilio (72) G. Umana (72) A. Lahtenmaki (73) E. Nieppola (73 74) M. Tornikoski (73) J. Sainio (20) M. Giroletti (75) A. Cesarini (76) L. Fuhrmann (77) Yu. A. Kovalev (78) Y. Y. Kovalev (77 78) ((1) IFAE Edifici Cn. Campus UAB E-08193 Bellaterra Spain (2) Universit\`a di Udine INFN Trieste I-33100 Udine Italy (3) INAF National Institute for Astrophysics I-00136 Rome (4) Universit\`a di Siena INFN Pisa I-53100 Siena (5) Croatian MAGIC Consortium Rudjer Boskovic Institute University of Rijeka University of Split HR-10000 Zagreb Croatia (6) Max-Planck-Institut f\"ur Physik D-80805 M\"unchen Germany (7) Universidad Complutense E-28040 Madrid (8) Inst. de Astrof\'isica de Canarias E-38200 La Laguna Tenerife (9) University of Lodz PL-90236 Lodz Poland (10) Deutsches Elektronen-Synchrotron (DESY) D-15738 Zeuthen (11) ETH Zurich CH-8093 Zurich Switzerland (12) Universit\"at W\"urzburg D-97074 W\"urzburg (13) Centro de Investigaciones Energ\'eticas Medioambientales y Tecnol\'ogicas (14) Technische Universit\"at Dortmund D-44221 Dortmund (15) Inst. de Astrof\'isica de Andaluc\'ia (CSIC) E-18080 Granada (16) Universit\`a di Padova INFN I-35131 Padova (17) Universit\`a dell'Insubria Como I-22100 Como (18) Unitat de F\'isica de les Radiacions Departament de F\'isica CERES-IEEC Universitat Aut\`onoma de Barcelona (19) Institut de Ci\`encies de l'Espai (IEEC-CSIC) (20) Finnish MAGIC Consortium Tuorla Observatory University of Turku Department of Physics University of Oulu Finland (21) Japanese MAGIC Consortium Division of Physics Astronomy Kyoto University Japan (22) Inst. for Nucl. Research Nucl. Energy BG-1784 Sofia Bulgaria (23) Universitat de Barcelona (ICC/IEEC) E-08028 Barcelona (24) Universit\`a di Pisa I-56126 Pisa (25) now at Ecole polytechnique f\'ed\'erale de Lausanne (EPFL) Lausanne (26) now at Department of Physics \& Astronomy UC Riverside CA 92521 USA (27) now at Finnish Centre for Astronomy with ESO (FINCA) Turku (28) also at INAF-Trieste (29) also at Instituto de Fisica Teorica UAM/CSIC E-28049 Madrid (30) Now at Stockholms universitet Oskar Klein Centre for Cosmoparticle Physics (31) now at GRAPPA Institute University of Amsterdam 1098XH (32) Department of Physics Washington University St. Louis MO 63130 (33) Fred Lawrence Whipple Observatory Harvard-Smithsonian Center for Astrophysics Amado AZ 85645 (34) Department of Physics the Bartol Research Institute University of Delaware Newark DE 19716 (35) School of Physics University College Dublin Belfield Dublin 4 Ireland (36) Santa Cruz Institute for Particle Physics University of California Santa Cruz CA 95064 (37) Institute of Physics University of Potsdam 14476 Potsdam-Golm (38) Astronomy Department Adler Planetarium Astronomy Museum Chicago IL 60605 (39) Department of Physics Purdue University West Lafayette IN 47907 (40) Department of Physics Grinnell College Grinnell IA 50112-1690 (41) School of Physics University of Minnesota Minneapolis MN 55455 (42) Department of Astronomy Astrophysics 525 Davey Lab Pennsylvania State University University Park PA 16802 (43) School of Physics National University of Ireland Galway University Road Galway (44) Physics Department McGill University Montreal QC H3A 2T8 Canada (45) Department of Physics University of Iowa Van Allen Hall Iowa City IA 52242 (46) Department of Physics DePauw University Greencastle IN 46135-0037 (47) Department of Physics University of Utah Salt Lake City UT 84112 (48) Department of Physics Iowa State University Ames IA 50011 (49) Department of Physics Los Angeles CA 90095 (50) Saha Institute of Nuclear Physics Kolkata 700064 India (51) School of Physics Center for Relativistic Astrophysics Georgia Institute of Technology 837 State Street NW Atlanta GA 30332-0430 (52) Department of Life Physical Sciences Galway-Mayo Institute of Technology Dublin Road (53) Department of Physics Barnard College Columbia University NY 10027 (54) Physics Department New York (55) Instituto de Astronomia y Fisica del Espacio Casilla de Correo 67 - Sucursal 28 (C1428ZAA) Ciudad Aut\'onoma de Buenos Aires Argentina (56) Physics Department California Polytechnic State University San Luis Obispo CA 94307 (57) Department of Applied Physics Instrumentation Cork Institute of Technology Bishopstown Cork (58) Enrico Fermi Institute University of Chicago IL 60637 (59) Argonne National Laboratory 9700 S. Cass Avenue Argonne IL 60439 (60) INAF Osservatorio Astronomico di Torino I-10025 Pino Torinese (TO) (61) Space Sciences Laboratory 7 Gauss Way Berkeley CA 94720-7450 (62) ASI-Science Data Center Via del Politecnico I-00133 Rome (63) Department of Astronomy University of Michigan Ann Arbor MI 48109-1042 (64) Astron. Inst. St.-Petersburg State Univ. Russia (65) Pulkovo Observatory St.-Petersburg (66) Isaac Newton Institute of Chile St.-Petersburg Branch (67) Graduate Institute of Astronomy National Central University 300 Jhongda Rd. Jhongli 32001 Taiwan (68) Moscow M.V. Lomonosov State University Sternberg Astronomical Institute (69) Abastumani Observatory Mt. Kanobili 0301 Abastumani Georgia (70) Landessternwarte Zentrum f\"ur Astronomie der Universit\"at (71) School of Cosmic Physics Dublin Institute for Advanced Studies (72) INAF - Osservatorio Astrofisico di Catania (73) Aalto University Mets\"ahovi Radio Observatory Mets\"ahovintie 114 FIN-02540 Kylm\"al\"a Finland (74) Finnish Centre for Astronomy with ESO (FINCA) University of Turku V\"ais\"al\"antie 20 FIN-21500 Piikki\"o Finland (75) INAF Istituto di Radioastronomia 40129 Bologna (76) University of Trento I38050 Povo Trento (77) Max-Planck-Institut f\"ur Radioastronomie Auf dem H\"ugel 69 53121 Bonn (78) Astro Space Center of the Lebedev Physical Institute 117997 (79) Engelhardt Astronomical Observatory Kazan Federal University Tatarstan Russia)

Authors on Pith no claims yet

classification 🌌 astro-ph.HE

keywords duringactivityemissionflaringcampaignfluxinstrumentsbeen

0 comments

read the original abstract

Mrk 501 is one of the brightest blazars at TeV energies and has been extensively studied since its first VHE detection in 1996. Our goal is to characterize in detail the source gamma-ray emission, together with the radio-to-X-ray emission, during the non-flaring (low) activity, which is less often studied than the occasional flaring (high) activity. We organized a multiwavelength (MW) campaign on Mrk 501 between March and May 2008. This multi-instrument effort included the most sensitive VHE gamma-ray instruments in the northern hemisphere, namely the imaging atmospheric Cherenkov telescopes MAGIC and VERITAS, as well as Swift, RXTE, the F-GAMMA, GASP-WEBT, and other collaborations and instruments. Mrk 501 was found to be in a low state of activity during the campaign, with a VHE flux in the range of 10%-20% of the Crab nebula flux. Nevertheless, significant flux variations were detected with various instruments, with a trend of increasing variability with energy. The broadband spectral energy distribution during the two different emission states of the campaign can be adequately described within the homogeneous one-zone synchrotron self-Compton model, with the (slightly) higher state described by an increase in the electron number density. This agrees with previous studies of the broadband emission of this source during flaring and non-flaring states. We report for the first time a tentative X-ray-to-VHE correlation during a low VHE activity. Although marginally significant, this positive correlation between X-ray and VHE, which has been reported many times during flaring activity, suggests that the mechanisms that dominate the X-ray/VHE emission during non-flaring-activity are not substantially different from those that are responsible for the emission during flaring activity.

This paper has not been read by Pith yet.

discussion (0)

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

Tracking down the broadband polarimetric properties of PG 1553+113
astro-ph.HE 2026-05 unverdicted novelty 4.0

New IXPE X-ray polarimetry and optical monitoring of PG 1553+113 reveal variable polarization and a large EVPA swing, supporting jet models with related but non-co-spatial X-ray and optical emission regions.