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H. Jermak
Liverpool John Moores University
44Publications
7H-index
137Citations
Publications 44
Newest
#1Vinesh Maguire-Rajpaul (University of Cambridge)
#2H. Jermak (LJMU: Liverpool John Moores University)H-Index: 7
Last.Stacey Habergham-Mawson (LJMU: Liverpool John Moores University)
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#1Mauri J. ValtonenH-Index: 26
#2S. ZoH-Index: 19
Last.M. ZejmoH-Index: 3
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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 \alphaand the mass accretion rate \dot m We find \alpha=0.26 \pm 0.1and \dot m = 0.08 \pm 0.04in Eddington units. The former value is consistent with Coroniti (1981) and the latter with Marscher and Jorstad (2011). Predictions are made for the 2019 July 30 superflare in...
#1Lankeswar DeyH-Index: 2
Last.V. PiirolaH-Index: 13
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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 ...
#1Justyn R. Maund (University of Sheffield)H-Index: 37
#2Iain A. Steele (LJMU: Liverpool John Moores University)H-Index: 45
Last.Klaas Wiersema (Warw.: University of Warwick)H-Index: 47
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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...
#1Cm Gutierrez (CSIC: Spanish National Research Council)H-Index: 1
#2Donald M. Arnold (LJMU: Liverpool John Moores University)H-Index: 37
Last.R. Rebolo (CSIC: Spanish National Research Council)H-Index: 71
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#1M. L. Ahnen (ETH Zurich)H-Index: 10
#2S. AnsoldiH-Index: 20
Last.J. Becerra-Gonzalez (ULL: University of La Laguna)H-Index: 1
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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...
#1M. L. Ahnen (ETH Zurich)H-Index: 10
#2S. AnsoldiH-Index: 20
Last.Juan Abel Barrio UñaH-Index: 46
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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...
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