Results 111 to 120 of about 6,025 (156)

Refractive interstellar scintillation of radio sources

The Astrophysical Journal, 1986
On propose une theorie simplifiee pour le phenomene de scintillation interstellaire refractive et on l'examine en tant qu'interpretation possible des variations observees pour de nombreuses ...
openaire   +1 more source

Prospects for Identifying Pulsar Candidates in Radio Surveys Using Scintillation

The Astrophysical Journal
In our previous paper, we developed a technique for identifying pulsar candidates in interferometric radio images using their distinctive scintillation signatures.
Jitendra Salal, Shriharsh P. Tendulkar, Visweshwar Ram Marthi   +2 more
doaj   +1 more source

Modeling the Morphology of Fast Radio Bursts and Radio Pulsars with fitburst

The Astrophysical Journal Supplement Series
We present a framework for modeling astrophysical pulses from radio pulsars and fast radio bursts (FRBs). This framework, called fitburst , generates synthetic representations of dynamic spectra that are functions of several physical and heuristic ...
E. Fonseca, Z. Pleunis, D. Breitman, K. R. Sand, B. Kharel, P. J. Boyle, C. Brar, U. Giri, V. M. Kaspi, K. W. Masui, B. W. Meyers, C. Patel, P. Scholz, K. Smith   +13 more
doaj   +1 more source

Different Polarized Components of the Quasar 3C 286 Revealed by FAST

The Astrophysical Journal
3C 286, a well-known radio calibrator, exhibits stability in both total flux density and polarization parameters. However, its stable and luminous interstellar radio signal may encounter interplanetary scintillation (IPS) due to density irregularities in
Pengfu Tian, Xiao Chen, Wen Yang, Wei Wang   +3 more
doaj   +1 more source

Implications for Galactic Electron Density Structure from Pulsar Sightlines Intersecting H ii Regions

The Astrophysical Journal
Recent radio surveys have revealed pulsars with dispersion and scattering delays induced by ionized gas that are larger than the rest of the observed pulsar population, in some cases with electron column densities (or dispersion measures, DMs) larger ...
Stella Koch Ocker, Loren D. Anderson, T. Joseph W. Lazio, James M. Cordes, Vikram Ravi   +4 more
doaj   +1 more source

Interstellar scintillation is an indicator of astrometric stability

, 2013
We examine the relationship between astrometric stability and astrophysical properties in flat-spectrum radio-loud quasars making up the celestial reference frame. We use position determinations from geodetic VLBI measurements, and develop a new metric for source position stability.
Schaap, Robert, Shabala, Stanislav, Ellingsen, Simon, Titov, Oleg, Lovell, Jim   +4 more
openaire   +2 more sources

Shocks, Compressible Perturbations, and Intermittency in the Very Local Interstellar Medium: Voyager 1 and 2 Observations and Numerical Modeling

The Astrophysical Journal
The Voyager spacecraft (V1 and V2) provide unique in situ measurements of perturbations propagating beyond the heliopause through the very local interstellar medium (VLISM), including the shocks and pressure fronts whose origin is debated. In particular,
Federico Fraternale, Nikolai V. Pogorelov, Ratan Bera, Leonard F. Burlaga, Maciej Bzowski   +4 more
doaj   +1 more source

Radio Burst Phenomenology of AD Leonis and Associated Signatures of Propagation Effects

The Astrophysical Journal
We present the high-resolution radio dynamic spectra of AD Leonis (AD Leo) between 1.0 and 1.5 GHz taken by the Five-hundred-meter Aperture Spherical radio Telescope on 2023 December 1.
Jiale Zhang, Harish K. Vedantham, Joseph R. Callingham, Hui Tian   +3 more
doaj   +1 more source

Direct Very Long Baseline Interferometry Detection of Interstellar Turbulence Imprint on a Quasar: TXS 2005+403

The Astrophysical Journal Letters
We report the first unambiguous detection of refractive substructure in an active galactic nucleus (AGN) using ground-based very long baseline interferometry (VLBI).
A. V. Plavin, A. B. Pushkarev, Y. Y. Kovalev   +2 more
doaj   +1 more source

Detecting Dark Objects with Plasma Microlensing by Their Gravitational Wakes

The Astrophysical Journal
A moving mass makes a gravitational wake in the partially ionized interstellar medium, which acts as a lens for radio-frequency light. Consequently, plasma microlensing could complement gravitational microlensing in the search for invisible massive ...
M. Sten Delos
doaj   +1 more source