8 papers
Transient X-ray Sources as Extremely Eccentric Mass-Transfer Binaries with Compact Companions
Jonathan I. Katz, Michael A. Nowak
It has long been suggested that X-ray transients are produced at periastron of stellar-compact object binaries with eccentric orbits. Recoil of matter evaporated from the star by X…
Triaxial Magnetars as Sources of Fast Radio Bursts
J. I. Katz
Some of the mysterious temporal properties of Fast Radio Bursts (FRB) may be explained if they are produced by dynamically triaxial magnetars. If the bursts are narrowly collimated…
Searching for Periodicity in FRB 20240114A
J. I. Katz
FRB 20240114A is extraordinarily active, and therefore presents an opportunity to search for the periodicity predicted by magnetar models of Fast Radio Bursts (FRB). Zhang, et al.…
Collimation of Fast Radio Burster 20201124A; Repeaters vs. Apparent Non-Repeaters
J. I. Katz
The recent report of a period in the active repeating Fast Radio Burster 20201124A and of its spindown rate place bounds on the solid angle of its emission on the basis of energeti…
Comparative Statistics of Solar Flares and Flare Stars
J. I. Katz, M. Bharmal, M. Ju +1
The distribution of interval times between recurrent discrete events, such as Solar and stellar flares, reflects their underlying dynamics. Log-normal functions provide good fits t…
Photon Interval Statistics Measure Rapid Variability
J. I. Katz, M. Nowak
Modern X-ray and gamma-ray observatories time-tag detected photons. The distribution of intervals between successive photons may reveal variations of the flux on time scales too sh…
Orbital and Precession Periods in Repeating FRB 20121102A
J. I. Katz
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 th…
Radiation Modes in FRB 20220912A Microshots and a Crab PSR nanoshot
J. I. Katz
A microshot from FRB 20220912A \citep{H23} satisfies the uncertainty relation by a factor of only . A Crab pulsar nanoshot \citep{HE07} exceeds this bou…