Conveners
Pulsars: Pulsars II
- Bronislaw Rudak (Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences)
Millisecond pulsars (MSPs) are old pulsars which have been spun-up to incredible rotation rates by the accretion of matter from an orbiting companion star. Their extreme properties and long-term stability make them valuable objects for a wide variety of fundamental astrophysics. In recent years, the rate of new MSP discoveries has increased dramatically, owing in large part to the "treasure...
Fermi has detected over 200 pulsars above 100 MeV. In a previous work, using 3 years of LAT data (1FHL catalog) we reported that 28 of these pulsars show emission above 10 GeV; only three of these, however, were millisecond pulsars. The recently-released Third Catalog of Hard Fermi-LAT Sources (3FHL) contains over 1500 sources showing emission above 10 GeV, 17 of which are associated with...
With a growing number of gamma-ray emitting millisecond pulsars (MSPs) discovered by Fermi and by combining multi-wavelength observing facilities, it is now possible to study their properties as a population. One of the successes is the discovery of gamma-ray emitting compact MSP binaries known as black-widow and redback systems and this opens a new window to study pulsars and their evolution....
A new theory of the gamma-ray flares from the Crab Nebula is presented, in which the trigger is a sudden drop in the mass-loading of the pulsar wind. The current required to maintain wave activity in the wind is then carried by very few particles of high Lorentz factor. On impacting the Nebula, these particles produce a tightly beamed, high luminosity burst of hard gamma-rays, which reproduces...
Cosmic-ray positrons are charged antiparticles that strike Earth’s atmosphere isotropically. At energies below several GeV they are produced by cosmic-ray protons interacting with nearby interstellar matter. At higher energies, an unexpected and unexplained excess above the proton-induced background has been detected by several satellites, including PAMELA, AMS-02 and Fermi. Due to energy...
We present the results of the analysis of 8 years of Fermi-LAT data of the pulsar/pulsar wind nebula complex PSRJ0205+6449/3C 58. Using a contemporaneous ephemeris, we carried out a detailed analysis of PSRJ0205+6449 both during its off-peak and on-peak phase intervals. 3C 58 is significantly detected during the off-peak phase interval. Hints for a possible flare from 3C 58 are identified. We...
We present the results of the analysis of 13 gamma-ray pulsars discovered in the Einstein@Home blind search survey using Fermi Large Area Telescope (LAT) Pass 8 data. The 13 new gamma-ray pulsars were discovered by searching 118 unassociated LAT sources from the third LAT source catalog (3FGL), selected using the Gaussian Mixture Model (GMM) machine learning algorithm on the basis of their...
We have performed a statistical analysis to compare the populations of radio-quiet gamma-ray pulsars and non-recycled radio-loud gamma-ray pulsars. We found a number of physical properties of these two populations are different such as the magnetic field at the light cylinder, the gamma-ray to x-ray flux ratio, and their gamma-ray spectral curvature. Such differences can shed light on the...
The pulsed radiation from PSR B0833-45 (Vela) has a phased-averaged spectral
energy distribution of an apparently simple structure across a wide energy range.
However, in narrow energy bands the pulses reveal astonishing complexity of
the directional pattern of the radiation. We present the results of a 3D modeling
of the Vela radiation properties in the outer-gap scenario.
We show...
