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H. Jermak
Liverpool John Moores University
45Publications
8H-index
183Citations
Publications 51
Newest
We present a multiwavelength study of the flat-spectrum radio quasar CTA 102 during 2013-2017. We use radio-to-optical data obtained by the Whole Earth Blazar Telescope, 15 GHz data from the Owens Valley Radio Observatory, 91 and 103 GHz data from the Atacama Large Millimeter Array, near-infrared data from the Rapid Eye Monitor telescope, as well as data from the Swift (optical-UV and X-rays) and Fermi (\gammarays) satellites to study flux and spectral variability and the correlation between ...
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#1C. M. Raiteri (INAF)H-Index: 40
#2Massimo Villata (INAF)H-Index: 10
Last.O. VinceH-Index: 8
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#1F. D'Ammando (INAF)H-Index: 5
#2C. M. Raiteri (INAF)H-Index: 9
Last.M. G. Mingaliev (Kazan: Kazan Federal University)H-Index: 10
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#1Vinesh Maguire-Rajpaul (University of Cambridge)
#2H. Jermak (LJMU: Liverpool John Moores University)H-Index: 8
Last.Stacey Habergham-Mawson (LJMU: Liverpool John Moores University)
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#1Mauri Valtonen (UTU: University of Turku)
#2S. Zo (UP: Pedagogical University)H-Index: 17
Last.Seppo Laine (California Institute of Technology)H-Index: 27
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In the binary black hole model of OJ 287, the secondary black hole orbits a much more massive primary, and impacts on the primary accretion disk at predictable times. We update the parameters of the disk, the viscosity, α, and the mass accretion rate, m. We find α = 0.26±0.1 and m=0.08±0.04 in Eddington units. The former value is consistent with Coroniti, and the latter with Marscher & Jorstad. Predictions are made for the 2019 July 30 superflare in OJ 287. We expect that it will take place simu...
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#1Lankeswar DeyH-Index: 2
Last.Stefanie KomossaH-Index: 21
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The bright blazar OJ 287 is the best-known candidate for hosting a nanohertz gravitational wave (GW) emitting supermassive binary black hole (SMBBH) in the present observable universe. The binary black hole (BBH) central engine model, proposed by Lehto and Valtonen in 1996, was influenced by the two distinct periodicities inferred from the optical light curve of OJ 287. The current improved model employs an accurate general relativistic description to track the trajectory of the secondary black ...
1 Citations
#1Justyn R. Maund (University of Sheffield)H-Index: 39
#2Iain A. Steele (LJMU: Liverpool John Moores University)H-Index: 46
Last.Klaas Wiersema (Warw.: University of Warwick)H-Index: 37
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The origin of the luminosity of superluminous supernovae (SLSNe) is an unresolved mystery, and a number of very different physical scenarios (including energy injection from magnetars, collision with a dense circumstellar medium and pair instability-induced explosions) have been invoked. The application of polarimetry to normal SNe has been shown to probe the three-dimensional structure of exploding stars, providing clues to the nature of the explosion mechanism. We report imaging linear polarim...
1 CitationsSource
#1C. M. Gutiérrez (CSIC: Spanish National Research Council)H-Index: 1
#2Donald M. Arnold (LJMU: Liverpool John Moores University)H-Index: 41
Last.M. Torres (CSIC: Spanish National Research Council)
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#1Max Ludwig Ahnen (ETH Zurich)H-Index: 12
#2Stefano AnsoldiH-Index: 24
Last.Matthew G. Baring (Rice University)H-Index: 40
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A multiwavelength campaign was organized to take place between March and July of 2012. Excellent temporal coverage was obtained with more than 25 instruments, including the MAGIC, FACT and VERITAS Cherenkov telescopes, the instruments on board the Swift and Fermi spacecraft, and the telescopes operated by the GASP-WEBT collaboration. Mrk 501 showed a very high energy (VHE) gamma-ray flux above 0.2 TeV of \sim.5 times the Crab Nebula flux (CU) for most of the campaign. The highest activity occ...
4 CitationsSource
#1Max Ludwig Ahnen (ETH Zurich)H-Index: 12
#2Stefano Ansoldi (University of Udine)H-Index: 24
Last.J. A. Zensus (MPG: Max Planck Society)H-Index: 43
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The BL Lac object S5~0716+714, a highly variable blazar, underwent an impressive outburst in January 2015 (Phase A), followed by minor activity in February (Phase B). The MAGIC observations were triggered by the optical flux observed in Phase A, corresponding to the brightest ever reported state of the source in the R-band. The comprehensive dataset collected is investigated in order to shed light on the mechanism of the broadband emission. Multi-wavelength light curves have been studied togethe...
1 CitationsSource
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