First NuSTAR Observations of Mrk 501 within a Radio to TeV Multi-Instrument Campaign
Creators: name: Furniss, A.
name: Noda, K.
name: Boggs, S.
name: Chiang, J.
name: Christensen, F.
name: Craig, W.
name: Giommi, P .
name: Hailey, C.
name: Harisson, F.
name: Madejski, G.
name: Nalewajko, K.
name: Perri, M.
name: Stern, D.
name: Urry, M.
name: Verrecchia, F.
name: Zhang, W.
name: Ahnen, M. L.
name: Ansoldi, S.
name: Antonelli, L. A.
name: Antoranz, P.
name: Babic, A.
name: Banerjee, B.
name: Bangale, P.
name: de Almeida, U. Barres
name: Barrio, J. A.
name: Gonzalez, J. Becerra
name: Bednarek, W.
name: Bernardini, E.
name: Biasuzzi, B.
name: Biland, A.
name: Blanch, O.
name: Bonnefoy, S.
name: Bonnoli, G.
name: Borracci, F.
name: Bretz, T.
name: Carmona, E.
name: Carosi, A.
name: Chatterjee, A.
name: Clavero, R.
name: Colin, P.
name: Colombo, E.
name: Contreras, J. L.
name: Cortina, J.
name: Covino, S.
name: Da Vela, P.
name: Dazzi, F.
name: De Angelis, A.
name: De Caneva, G.
name: De Lotto, B.
name: Wilhelmi, E. de Ona
name: Mendez, C. Delgado
name: Di Pierro, F.
name: Prester, D. Dominis
name: Dorner, D.
name: Doro, M.
name: Einecke, S.
name: Glawion, D. Eisenacher
name: Elsaesser, D.
name: Fernandez-Barral, A.
name: Fidalgo, D.
name: Fonseca, M. V.
name: Font, L.
name: Frantzen, K.
name: Fruck, C.
name: Galindo, D.
name: Lopez, R. J. Garcia
name: Garczarczyk, M.
name: Terrats, D. Garrido
name: Gaug, M.
name: Giammaria, P.
name: Godinovic, N.
name: Munoz, A. Gonzalez
name: Guberman, D.
name: Hanabata, Y.
name: Hayashida, M.
name: Herrera, J.
name: Hose, J.
name: Hrupec, D.
name: Hughes, G.
name: Idec, W.
name: Kellermann, H.
name: Kodani, K.
name: Konno, Y.
name: Kubo, H.
name: Kushida, J.
name: La Barbera, A.
name: Lelas, D.
name: Lewandowska, N.
name: Lindfors, E.
name: Lombardi, S.
name: Longo, F.
name: Lopez, M.
name: Lopez-Coto, R.
name: Lopez-Oramas, A.
name: Lorenz, E.
name: Majumdar, P.
name: Makariev, M.
name: Mallot, K.
name: Maneva, G.
name: Manganaro, M.
name: Mannheim, K.
name: Maraschi, L.
name: Marcote, B.
name: Mariotti, M.
name: Martinez, M.
name: Mazin, D.
name: Menzel, U.
name: Miranda, J. M.
name: Mirzoyan, R.
name: Moralejo, A.
name: Nakajima, D.
name: Neustroev, V.
name: Niedzwiecki, A.
name: Rosillo, M. Nievas
name: Nilsson, K.
name: Nishijima, K.
name: Orito, R.
name: Overkemping, A.
name: Paiano, S.
name: Palacio, J.
name: Palatiello, M.
name: Paneque, D.
name: Paoletti, R.
name: Paredes, J. M.
name: Paredes-Fortuny, X.
name: Persic, M.
name: Poutanen, J.
name: Moroni, P. G. Prada
name: Prandini, E.
name: Puljak, I.
name: Reinthal, R.
name: Rhode, W.
name: Ribo, M.
name: Rico, J.
name: Garcia, J. Rodriguez
name: Saito, T.
name: Saito, K.
name: Satalecka, K.
name: Scapin, V.
name: Schultz, C.
name: Schweizer, T.
name: Shore, S. N.
name: Sillanpaa, A.
name: Sitarek, J.
name: Snidaric, I.
name: Sobczynska, D.
name: Stamerra, A.
name: Steinbring, T.
name: Strzys, M.
name: Takalo, L.
name: Takami, H.
name: Tavecchio, F.
name: Temnikov, P.
name: Terzic, T.
name: Tescaro, D.
name: Teshima, M.
name: Thaele, J.
name: Torres, D. F.
name: Toyama, T.
name: Treves, A.
name: Verguilov, V.
name: Vovk, I.
name: Will, M.
name: Zanin, R.
name: Archer, A.
name: Benbow, W.
name: Bird, R.
name: Biteau, J.
name: Bugaev, V.
name: Cardenzana, J. V
name: Cerruti, M.
name: Chen, X.
name: Ciupik, L.
name: Connolly, M. P.
name: Cui, W.
name: Dickinson, H. J.
name: Dumm, J.
name: Eisch, J. D.
name: Falcone, A.
name: Feng, Q.
name: Finley, J. P.
name: Fleischhack, H.
name: Fortin, P.
name: Fortson, L.
name: Gerard, L.
name: Gillanders, G. H.
name: Griffin, S.
name: Griffiths, S. T.
name: Grube, J.
name: Gyuk, G.
name: Haakansson, N.
name: Holder, J.
name: Humensky, T. B.
name: Johnson, C. A.
name: Kaaret, P.
name: Kertzman, M.
name: Kieda, D.
name: Krause, M.
name: Krennrich, F.
name: Lang, M. J.
name: Lin, T. T. Y.
name: Maier, G.
name: McArthur, S.
name: McCann, A.
name: Meagher, K.
name: Moriarty, P.
name: Mukherjee, R.
name: Nieto, D.
name: de Bhroithe, A. O'Faolain
name: Ong, R. A.
name: Park, N.
name: Petry, D.
name: Pohl, M.
name: Popkow, A.
name: Ragan, K.
name: Ratliff, G.
name: Reyes, L. C.
name: Reynolds, P. T.
name: Richards, G. T.
name: Roache, E.
name: Santander, M.
name: Sembroski, G. H.
name: Shahinyan, K.
name: Staszak, D.
name: Telezhinsky, I.
name: Tucci, J. V.
name: Tyler, J.
name: Vassiliev, V. V.
name: Wakely, S. P.
name: Weiner, O. M.
name: Weinstein, A.
name: Wilhelm, A.
name: Williams, D. A.
name: Zitzer, B.
name: Fuhrmann, O. Vince L.
name: Angelakis, E.
name: Karamanavis, V.
name: Myserlis, I.
name: Krichbaum, T. P.
name: Zensus, J. A.
name: Ungerechts, H.
name: Sievers, A.
name: Bachev, R.
name: Bottcher, M.
name: Chen, W. P.
name: Damljanovic, G.
name: Eswaraiah, C.
name: Guver, T.
name: Hovatta, T.
name: Hughes, Z.
name: Ibryamov, S. . I.
name: Joner, M. D.
name: Jordan, B.
name: Jorstad, S. G.
name: Joshi, M.
name: Kataoka, J.
name: Kurtanidze, O. M.
name: Kurtanidze, S. O.
name: Lahteenmaki, A.
name: Latev, G.
name: Lin, H. C.
name: Larionov, V. M.
name: Mokrushina, A. A.
name: Morozova, D. A.
name: Nikolashvili, M. G.
name: Raiteri, C. M.
name: Ramakrishnan, V.
name: Readhead, A. C. R.
name: Sadun, A. C.
name: Sigua, L. A.
name: Semkov, E. H.
name: Strigachev, A.
name: Tammi, J.
name: Tornikoski, M.
name: Troitsky, Y. V. Troitskaya I. S.
name: Villata, M.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 1 April and 10 August 2013, including the first detailed characterization of the synchrotron peak with Swift and NuSTAR. During the campaign, the nearby BL Lac object was observed in both a quiescent and an elevated state. The broadband campaign includes observations with NuSTAR, MAGIC, VERITAS, the Fermi Large Area Telescope (LAT), Swift X-ray Telescope and UV Optical Telescope, various ground-based optical instruments, including the GASP-WEBT program, as well as radio observations by OVRO, Metsähovi and the F-Gamma consortium. Some of the MAGIC observations were affected by a sand layer from the Saharan desert, and had to be corrected using event-by-event corrections derived with a LIDAR (LIght Detection And Ranging) facility. This is the first time that LIDAR information is used to produce a physics result with Cherenkov Telescope data taken during adverse atmospheric conditions, and hence sets a precedent for the current and future ground-based gamma-ray instruments. The NuSTAR instrument provides unprecedented sensitivity in hard X-rays, showing the source to display a spectral energy distribution between 3 and 79 keV consistent with a log-parabolic spectrum and hard X-ray variability on hour timescales. None (of the four extended NuSTAR observations) shows evidence of the onset of inverse-Compton emission at hard X-ray energies. We apply a single-zone equilibrium synchrotron self-Compton model to five simultaneous broadband spectral energy distributions. We find that the synchrotron self-Compton model can reproduce the observed broadband states through a decrease in the magnetic field strength coinciding with an increase in the luminosity and hardness of the relativistic leptons responsible for the high-energy emission.
description: Accepted for publication in ApJ