First NuSTAR Observations of Mrk 501 within a Radio to TeV Multi-Instrument Campaign
Abstract
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, Mets\"ahovi 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.
Cite
@article{arxiv.1509.04936,
title = {First NuSTAR Observations of Mrk 501 within a Radio to TeV Multi-Instrument Campaign},
author = {A. Furniss and K. Noda and S. Boggs and J. Chiang and F. Christensen and W. Craig and P . Giommi and C. Hailey and F. Harisson and G. Madejski and K. Nalewajko and M. Perri and D. Stern and M. Urry and F. Verrecchia and W. Zhang and M. L. Ahnen and S. Ansoldi and L. A. Antonelli and P. Antoranz and A. Babic and B. Banerjee and P. Bangale and U. Barres de Almeida and J. A. Barrio and J. Becerra Gonzalez and W. Bednarek and E. Bernardini and B. Biasuzzi and A. Biland and O. Blanch and S. Bonnefoy and G. Bonnoli and F. Borracci and T. Bretz and E. Carmona and A. Carosi and A. Chatterjee and R. Clavero and P. Colin and E. Colombo and J. L. Contreras and J. Cortina and S. Covino and P. Da Vela and F. Dazzi and A. De Angelis and G. De Caneva and B. De Lotto and E. de Ona Wilhelmi and C. Delgado Mendez and F. Di Pierro and D. Dominis Prester and D. Dorner and M. Doro and S. Einecke and D. Eisenacher Glawion and D. Elsaesser and A. Fernandez-Barral and D. Fidalgo and M. V. Fonseca and L. Font and K. Frantzen and C. Fruck and D. Galindo and R. J. Garcia Lopez and M. Garczarczyk and D. Garrido Terrats and M. Gaug and P. Giammaria and N. Godinovic and A. Gonzalez Munoz and D. Guberman and Y. Hanabata and M. Hayashida and J. Herrera and J. Hose and D. Hrupec and G. Hughes and W. Idec and H. Kellermann and K. Kodani and Y. Konno and H. Kubo and J. Kushida and A. La Barbera and D. Lelas and N. Lewandowska and E. Lindfors and S. Lombardi and F. Longo and M. Lopez and R. Lopez-Coto and A. Lopez-Oramas and E. Lorenz and P. Majumdar and M. Makariev and K. Mallot and G. Maneva and M. Manganaro and K. Mannheim and L. Maraschi and B. Marcote and M. Mariotti and M. Martinez and D. Mazin and U. Menzel and J. M. Miranda and R. Mirzoyan and A. Moralejo and D. Nakajima and V. Neustroev and A. Niedzwiecki and M. Nievas Rosillo and K. Nilsson and K. Nishijima and R. Orito and A. Overkemping and S. Paiano and J. Palacio and M. Palatiello and D. Paneque and R. Paoletti and J. M. Paredes and X. Paredes-Fortuny and M. Persic and J. Poutanen and P. G. Prada Moroni and E. Prandini and I. Puljak and R. Reinthal and W. Rhode and M. Ribo and J. Rico and J. Rodriguez Garcia and T. Saito and K. Saito and K. Satalecka and V. Scapin and C. Schultz and T. Schweizer and S. N. Shore and A. Sillanpaa and J. Sitarek and I. Snidaric and D. Sobczynska and A. Stamerra and T. Steinbring and M. Strzys and L. Takalo and H. Takami and F. Tavecchio and P. Temnikov and T. Terzic and D. Tescaro and M. Teshima and J. Thaele and D. F. Torres and T. Toyama and A. Treves and V. Verguilov and I. Vovk and M. Will and R. Zanin and A. Archer and W. Benbow and R. Bird and J. Biteau and V. Bugaev and J. V Cardenzana and M. Cerruti and X. Chen and L. Ciupik and M. P. Connolly and W. Cui and H. J. Dickinson and J. Dumm and J. D. Eisch and A. Falcone and Q. Feng and J. P. Finley and H. Fleischhack and P. Fortin and L. Fortson and L. Gerard and G. H. Gillanders and S. Griffin and S. T. Griffiths and J. Grube and G. Gyuk and N. Haakansson and J. Holder and T. B. Humensky and C. A. Johnson and P. Kaaret and M. Kertzman and D. Kieda and M. Krause and F. Krennrich and M. J. Lang and T. T. Y. Lin and G. Maier and S. McArthur and A. McCann and K. Meagher and P. Moriarty and R. Mukherjee and D. Nieto and A. O'Faolain de Bhroithe and R. A. Ong and N. Park and D. Petry and M. Pohl and A. Popkow and K. Ragan and G. Ratliff and L. C. Reyes and P. T. Reynolds and G. T. Richards and E. Roache and M. Santander and G. H. Sembroski and K. Shahinyan and D. Staszak and I. Telezhinsky and J. V. Tucci and J. Tyler and V. V. Vassiliev and S. P. Wakely and O. M. Weiner and A. Weinstein and A. Wilhelm and D. A. Williams and B. Zitzer and O. Vince L. Fuhrmann and E. Angelakis and V. Karamanavis and I. Myserlis and T. P. Krichbaum and J. A. Zensus and H. Ungerechts and A. Sievers and R. Bachev and M. Bottcher and W. P. Chen and G. Damljanovic and C. Eswaraiah and T. Guver and T. Hovatta and Z. Hughes and S. . I. Ibryamov and M. D. Joner and B. Jordan and S. G. Jorstad and M. Joshi and J. Kataoka and O. M. Kurtanidze and S. O. Kurtanidze and A. Lahteenmaki and G. Latev and H. C. Lin and V. M. Larionov and A. A. Mokrushina and D. A. Morozova and M. G. Nikolashvili and C. M. Raiteri and V. Ramakrishnan and A. C. R. Readhead and A. C. Sadun and L. A. Sigua and E. H. Semkov and A. Strigachev and J. Tammi and M. Tornikoski and Y. V. Troitskaya I. S. Troitsky and M. Villata},
journal= {arXiv preprint arXiv:1509.04936},
year = {2015}
}
Comments
Accepted for publication in ApJ