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A search for spectral hysteresis and energy-dependent time lags from X-ray and TeV gamma-ray observations of Mrk 421


Abeysekara, A.U.; Archambault, S.; Archer, A.; Benbow, W.; Bird, R.; Buchovecky, M.; Buckley, J.H.; Bugaev, V.; Cardenzana, J.V; Cerruti, M. et al.
A search for spectral hysteresis and energy-dependent time lags from X-ray and TeV gamma-ray observations of Mrk 421 // The Astrophysical journal, 834 (2017), 1; 2-1 doi:10.3847/1538-4357/834/1/2 (međunarodna recenzija, članak, znanstveni)


Naslov
A search for spectral hysteresis and energy-dependent time lags from X-ray and TeV gamma-ray observations of Mrk 421

Autori
Abeysekara, A.U. ; Archambault, S. ; Archer, A. ; Benbow, W. ; Bird, R. ; Buchovecky, M. ; Buckley, J.H. ; Bugaev, V. ; Cardenzana, J.V ; Cerruti, M. ; Chen, X. ; Ciupik, L. ; Connolly, M.P. ; Cui, W. ; Eisch, J.D. ; Falcone, A. ; Feng, Q. ; Finley, J.P. ; Fleischhack, H. ; Flinders, A. ; Fortson, L. ; Furniss, A. ; Griffin, S. ; Håkansson, M.H.N. ; Hanna, D. ; Hervet, O. ; Holder, J. ; Humensky, T.B. ; Kaaret, P. ; Kar, P. ; Kertzman, M. ; Kieda, D. ; Krause, M. ; Kumar, S. ; Lang, M.J. ; Maier, G. ; McArthur, S. ; McCann, A. ; Meagher, K. ; Moriarty, P. ; Mukherjee, R. ; Nieto, D. ; Ong, S.O.R.A. ; Otte, A.N. ; Park, N. ; Pelassa, V. ; Pohl, M. ; Popkow, A. ; Pueschel, E. ; Ragan, K. ; Reynolds, P.T. ; Richards, G.T. ; Roache, E. ; Sadeh, I. ; Santander, M. ; Sembroski, G.H. ; Shahinyan, K. ; Staszak, D. ; Telezhinsky, I. ; Tucci, J.V. ; Tyler, J. ; Wakely, S.P. ; Weinstein, A. ; Wilhelm, A. ; Williams, D.A. ; Ahnen, M.L. ; Ansoldi, S. ; Antonelli, L.A. ; Antoranz, P. ; Arcaro, C. ; Babić, Ana ; Banerjee, B. ; Bangale, P. ; Almeida, Barres de U. ; Barrio, J.A. ; González, J. Becerra ; Bednarek, W. ; Bernardini, E. ; Berti, A. ; Biasuzzi, B. ; Biland, A. ; Blanch, O. ; Bonnefoy, S. ; Bonnoli, G. ; Borracci, F. ; Bretz, T. ; Carosi, R. ; Carosi, A. ; Chatterjee, A. ; Colin, P. ; Colombo, E. ; Contreras, J. L. ; Cortina, J. ; Covino, S. ; Cumani, P. ; Da Vela, P. ; Dazzi, F. ; De Angelis, A. ; De Lotto, B. ; de Oña Wilhelmi, E. ; Di Pierro, F. ; Doert, M. ; Domínguez, A. ; Dominis Prester, Dijana ; Dorner, D. ; Doro, M. ; Einecke, S. ; Glawion, D. Eisenacher ; Elsaesser, D. ; Engelkemeier, M. ; Ramazani, V. Fallah ; Fernández-Barral, A. ; Fidalgo, D. ; Fonseca, M. V. ; Font, L. ; Fruck, C. ; Galindo, D. ; López, García R.J. ; Garczarczyk, M. ; Gaug, M. ; Giammaria, P. ; Godinović, Nikola ; Gora, D. ; Guberman, D. ; Hadasch, D. ; Hahn, A. ; Hassan, T. ; Hayashida, M. ; Herrera, J. ; Hose, J. ; Hrupec, Dario ; Hughes, G. ; Idec, W. ; Kodani, K. ; Konno, Y. ; Kubo, H. ; Kushida, J. ; Lelas, Damir ; Lindfors, E. ; Lombardi, S. ; Longo, F. ; López, M. ; López-Coto, R. ; Majumdar, P. ; Makariev, M. ; Mallot, K. ; Maneva, G. ; Manganaro, M. ; Mannheim, K. ; Maraschi, L. ; Marcote, B. ; Mariotti, M. ; Martínez, M. ; Mazin, D. ; Menzel, U. ; Mirzoyan, R. ; Moralejo, A. ; Moretti, E. ; Nakajima, D. ; Neustroev, V. ; Niedzwiecki, A. ; Rosillo, M. Nievas ; Nilsson, K. ; Nishijima, K. ; Noda, K. ; Nogués, L. ; Nöthe, M. ; Paiano, S. ; Palacio, J. ; Palatiello, M. ; Paneque, D. ; Paoletti, R. ; Paredes, J.M. ; Paredes-Fortuny, X. ; Pedaletti, G. ; Peresano, M. ; Perri, L. ; Peršić, M. ; Poutanen, J. ; Moroni, Prada P.G. ; Prandini, E. ; Puljak, Ivica ; Garcia, J.R. ; Reichardt, I. ; Rhode, W. ; Ribó, M. ; Rico, J. ; Saito, T. ; Satalecka, K. ; Schroeder, S. ; Schweizer, T. ; Shore, S. N. ; Sillanpää, A. ; Sitarek, J. ; Šnidarić, Iva ; Sobczynska, D. ; Stamerra, A. ; Strzys, M. ; Surić, Tihomir ; Takalo, L. ; Tavecchio, F. ; Temnikov, P. ; Terzić, Tomislav ; Tescaro, D. ; Teshima, M. ; Torres, D.F. ; Torres-Albà, N. ; Toyama, T. ; Treves, A. ; Vanzo, G. ; Acosta, M. Vazquez ; Vovk, I. ; Ward, J.E. ; Will, M. ; Wu, M.H. ; Zanin, R. ; Hovatta, T. ; de la Calle Perez, I. ; Smith, P.S. ; Racero, E. ; Baloković, M. ; undefined, undefined ; undefined, undefined

Izvornik
The Astrophysical journal (0004-637X) 834 (2017), 1; 2-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Galaxies: active – BL Lacertae objects: individual: (Markarian 421) ; gamma rays: general ; radiation mechanisms: non-thermal

Sažetak
Blazars are variable emitters across all wavelengths over a wide range of timescales, from months down to minutes. It is therefore essential to observe blazars simultaneously at different wavelengths, especially in the X-ray and gamma-ray bands, where the broadband spectral energy distributions usually peak. In this work, we report on three "target-of-opportunity" (ToO) observations of Mrk 421, one of the brightest TeV blazars, triggered by a strong flaring event at TeV energies in 2014. These observations feature long, continuous, and simultaneous exposures with XMM-Newton (covering X-ray and optical/ultraviolet bands) and VERITAS (covering TeV gamma-ray band), along with contemporaneous observations from other gamma-ray facilities (MAGIC and Fermi-LAT) and a number of radio and optical facilities. Although neither rapid flares nor significant X-ray/TeV correlation are detected, these observations reveal subtle changes in the X-ray spectrum of the source over the course of a few days. We search the simultaneous X-ray and TeV data for spectral hysteresis patterns and time delays, which could provide insight into the emission mechanisms and the source properties (e.g. the radius of the emitting region, the strength of the magnetic field, and related timescales). The observed broadband spectra are consistent with a one-zone synchrotron self-Compton model. We find that the power spectral density distribution at >4×10−4 Hz from the X-ray data can be described by a power-law model with an index value between 1.2 and 1.8, and do not find evidence for a steepening of the power spectral index (often associated with a characteristic length scale) compared to the previously reported values at lower frequencies.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Ustanove
Fakultet elektrotehnike, strojarstva i brodogradnje, Split,
Fakultet elektrotehnike i računarstva, Zagreb,
Institut "Ruđer Bošković", Zagreb,
Sveučilište u Osijeku - Odjel za fiziku,
Sveučilište u Rijeci - Odjel za fiziku

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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