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pro vyhledávání: '"Katz, J. I."'
Autor:
Katz, J. I.
Li {\it et al.\/} (2024) reported a 4.605 day period in the repeating FRB 20121102A in addition to the previously reported 157 day modulation of its activity. This note suggests that the shorter period is the orbital period of a mass-transferring sta
Externí odkaz:
http://arxiv.org/abs/2405.03721
Autor:
Katz, J. I.
A microshot from FRB 20220912A \citep{H23} satisfies the uncertainty relation $\Delta \omega \Delta t \ge 1$ by a factor of only $\lessapprox 3$. A Crab pulsar nanoshot \citep{HE07} exceeds this bound by a similar factor. The number of orthogonal pla
Externí odkaz:
http://arxiv.org/abs/2310.06173
Autor:
Katz, J. I.
Increasing marine haze and clouds has been considered as a possible means of increasing the Earth's albedo. This would reduce Solar heating and global warming, counteracting the effects of the anthropogenic increase in greenhouse gases. One proposed
Externí odkaz:
http://arxiv.org/abs/2310.08029
Autor:
Katz, J. I.
The activity of at least one repeating Fast Radio Burst (FRB) source is periodically modulated. If this modulation is the result of precession of the rotation axis and throat of an accretion disc around a black hole, driven by a companion that is als
Externí odkaz:
http://arxiv.org/abs/2306.01877
Autor:
Katz, J. I.
Many astronomical phenomena, including Fast Radio Bursts and Soft Gamma Repeaters, consist of brief, separated, seemingly aperiodic events. The intervals between these events vary randomly, but there are epochs of greater activity, with shorter mean
Externí odkaz:
http://arxiv.org/abs/2303.05578
Autor:
Katz, J. I.
Quasars and microquasars both contain accreting black holes and power nonthermal radio sources but differ in more than their scales: Quasars are proportionally much more efficient accelerators of energetic electrons. The radio luminosity of the doubl
Externí odkaz:
http://arxiv.org/abs/2302.00738
Autor:
Katz, J. I., Krassner, J.
Little is known about the radio astronomical universe at frequencies below 10 MHz because such radiation does not penetrate the ionosphere. A cubesat-based observatory for the 1--10 MHz band could be rapidly and economically deployed in low earth orb
Externí odkaz:
http://arxiv.org/abs/2209.07591
Autor:
Katz, J. I.
Repeating Fast Radio Bursts show temporal symmetry breaking on millisecond time scales (the "sad trombone"). On a time scale of days the repetitions of FRB 180916B occur at frequency-dependent phases of its 16.3 d period. Some models predict that all
Externí odkaz:
http://arxiv.org/abs/2209.01700
Autor:
Katz, J. I.
Publikováno v:
Open Journal of Astrophysics 7 (2024)
This paper argues that repeating and apparently non-repeating Fast Radio Bursts are distinct classes of events produced by distinct classes of sources. I review the evidence for that division, and then discusses the statistics of these classes. They
Externí odkaz:
http://arxiv.org/abs/2207.13241
Autor:
Katz, J. I.
Recent CHIME/FRB observations of the periodic repeating FRB 180916B have produced a homogeneous sample of 44 bursts. These permit a redetermination of the modulation period and phase window, in agreement with earlier results. If the periodicity resul
Externí odkaz:
http://arxiv.org/abs/2205.15385