Details

Autor(en) / Beteiligte

• Quispe, Janeth Valverde
• Acciari, V. A.
• Antonelli, L. A.
• U.BarresdeAlmeida, U.BarresdeAlmeida
• Berti, A.
• Besenrieder, J.
• Bhattacharyya, W.
• Bonnoli, G.
• Bosnjak, Z.
• Busetto, G.
• Carosi, R.
• Cerruti, M.
• Cikota, S.
• Colombo, E.
• Contreras, J. L.
• Cortina, J.
• Covino, S.
• D’Elia, V.
• Dazzi, F.
• Angelis, A. De
• Delgado, J.
• Fonseca, M. V.
• Font, L.
• Fukami, S.
• Lopez, R. J. Garcıa
• Garczarczyk, M.
• Gasparyan, S.
• Giglietto, N.
• Green, D.
• Hahn, A.
• Herrera, J.
• Hoang, J.
• Inada, T.
• Kajiwara, Y.
• Lamastra, A.
• Lopez-Oramas, A.
• Loporchio, S.
• Maggio, C.
• Mallamaci, M.
• Maneva, G.
• Manganaro, M.
• Mender, S.
• Minev, M.
• Mirzoyan, R.
• Moralejo, A.
• Moretti, E.
• Munar-Adrover, P.
• Neustroev, V.
• Nigro, C.
• Ninci, D.
• Ohtani, Y.
• Paoletti, R.
• Paredes, J. M.
• Pavletic, L.
• Perennes, C.
• Moroni, P. G . Prada
• Rhode, W.
• Righi, C.
• Rugliancich, A.
• Sahakyan, N.
• Saito, T.
• Sakurai, S.
• Schleicher, B.
• Sitarek, J.
• Strzys, M.
• Suda, Y.
• Suric, T.
• Takahashi, M.
• Temnikov, P.
• Teshima, M.
• Tosti, L.
• Truzzi, S.
• Scherpenberg, J. van
• Vanzo, G.
• Acosta, M. Vazquez
• Ventura, S.
• Verguilov, V.
• Vitale, V.
• Zaric, D.
• Beck, M.
• Biederbeck, N.
• Bruegge, K.
• Buss, J.
• Elsaesser, D.
• Iotov, R.
• Klinger, M.
• Neronov, A.
• Paravac, A.
• Theissen, F.
• Valverde, J.
• Horan, D.
• Giroletti, M.
• Verrecchia, F.
• Moody, J. W.
• Joner, M.
• Jorstad, S. G.
• Lahteenmaki, A.
• A.Y.Lien, A.Y.Lien

Titel

Multiwavelength Variability and Correlation Studies of Mrk 421 During Historically Low X-ray and Y-ray Activity in 2015–2016

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2020-12, Vol.504 (1)

Ort / Verlag

Goddard Space Flight Center: Oxford University Press

Erscheinungsjahr

2020

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We report a characterization of the multiband flux variability and correlations of the nearby (z=0.031) blazar Markarian 421(Mrk 421) using data from Mets ̈ahovi, Swift, Fermi-LAT, MAGIC, FACT, and other collaborations and instruments from 2014November till 2016 June. Mrk 421 did not show any prominent flaring activity, but exhibited periods of historically low activity above 1 TeV (F>1TeV<1.7×10−12ph cm−2s−1) and in the 2–10 keV (X-ray) band (F2−10 keV<3.6×10−11erg cm−2s−1),during which the Swift-BAT data suggest an additional spectral component beyond the regular synchrotron emission. The highest flux variability occurs in X-rays and very high-energy (E>0.1 TeV)γ-rays, which, despite the low activity, show a significant positive correlation with no time lag. The HRkeV and HRTeV show the harder-when-brighter trend observed in many blazars, but the trend flattens at the highest fluxes, which suggests a change in the processes dominating the blazar variability. Enlarging our dataset with data from years 2007 to 2014, we measured a positive correlation between the optical and the GeV emission over a range of about 60 d centred at time lag zero, and a positive correlation between the optical/GeV and the radio emission over a range of about 60 d centred at a time lag of 43+9−6d. This observation is consistent with the radio-bright zone being located about 0.2 parsec downstream from the optical/GeV emission regions of the jet. The flux distributions are better described with a lognormal function in most of the energy bands probed, indicating that the variability in Mrk 421 is likely produced by a multiplicative process.