Results 91 to 100 of about 6,025 (156)

Continued Radio Monitoring of the Gamma Ray Burst 991208

, 2002
We present radio observations of the afterglow of the bright gamma-ray burst GRB 991208 at frequencies of 1.4, 4.9 and 8.5 GHz, taken between two weeks and 300 days after the burst.
D. A. Frail, E. Berger, G. B. Taylor, R. Sari, S. R. Kulkarni, Sagar R., T. J. Galama   +6 more
core   +1 more source

Pulsar Scattering as a Probe for Structures in the Interstellar Medium

The Astrophysical Journal
Due to the inhomogeneity of electron number density, radio waves emitted by pulsars undergo scattering as they pass through the interstellar medium (ISM).
Qiuyi He, Xun Shi, Guangxing Li
doaj   +1 more source

Interstellar scintillation of extragalactic radio sources

The Astrophysical Journal, 1975
Observations of 12 compact extragalactic sources were made at 2695 and 8085 MHz in order to detect weak intensity fluctuations caused by interstellar scintillation. Pulsar data are used to estimate the parameters of the interstellar medium needed to interpret the measured upper limits in terms of source angular diameters which are much larger than the
J. J. Condon, D. C. Backer
openaire   +1 more source

The Pulsar Science Collaboratory: Multiepoch Scintillation Studies of Pulsars

The Astrophysical Journal
We report on findings from scintillation analyses using high-cadence observations of eight canonical pulsars with observing baselines ranging from 1–3 yr.
Jacob E. Turner, Juan G. Lebron Medina, Zachary Zelensky, Kathleen A. Gustavson, Jeffrey Marx, Manvith Kothapalli, Luis D. Cruz Vega, Alexander Lee, Caryelis B. Figueroa, Daniel E. Reichart, Joshua B. Haislip, Vladimir V. Kouprianov, Steve White, Frank Ghigo, Sue Ann Heatherly, Maura A. McLaughlin   +15 more
doaj   +1 more source

Pulsar radio spectra and the interstellar scintillation [PDF]

International Astronomical Union Colloquium, 2000
Abstract A review of the pulsar radio spectra is continued. Two approches of the spectrum construction are considered. The influence of the interstellar stcintillations on the pulsar flux density measurements and spectra is examined. The description of new pulsar spectra catalog is made.
openaire   +1 more source

NE2025: An Updated Electron Density Model for the Galactic Interstellar Medium

The Astrophysical Journal
Free electrons in the Galactic interstellar medium (ISM) disperse and scatter coherent radio waves, by amounts that depend on the distance to the radio source.
Stella Koch Ocker, James M. Cordes
doaj   +1 more source

Long-term Monitoring of Scintillation in the Pulsar J0332+5434

The Astrophysical Journal
Changes in a pulsar’s scintillation characteristics over time can be a useful way to probe the properties of the interstellar medium. Monitoring the scintillation bandwidth can be useful for correcting for scattering delay in pulse arrival time, which ...
Grayce C. Brown, Sofia Z. Sheikh, Luigi F. Cruz, Wael Farah, Vishal Gajjar, Christian Gilbertson, Brandon Grimaldo, Michael T. Lam, Sofia L. Marquez, Maura McLaughlin, Alexander W. Pollak, Andrew Siemion, Gurmehar Singh   +12 more
doaj   +1 more source

Imaging without visibilities

Astronomy & Astrophysics
Context. The spatially coherent multipath propagation of pulsar radiation leads to a temporal and spectral interference patterns called scintillation.
Sprenger Tim, Shi Xun, Wucknitz Olaf, Main Robert A.   +3 more
doaj   +1 more source

Size of the Vela Pulsar's Radio Emission Region: 500 km

, 1996
We use interstellar scattering of the Vela pulsar to determine the size of its emission region. From interferometric phase variations on short baselines, we find that radio-wave scattering broadens the source by 3.4+/-0.3 milliarcseconds along the major ...
Backer D. C., Blandford R. D., C. R. Gwinn, C. S. Flanagan, Codona J. L., Cornwell T. J., D. L. Jauncey, D. L. Jones, D. P. Smits, E. A. King, J. E. J. Lovell, J. E. Reynolds, M. C. Britton, M. J. Ojeda, Melrose D. B., Milne D. K., Narayan R., P. M. McCulloch, R. A. Preston, Radhakrishnan V., Wilkinson P. N., Williamson I. P.   +21 more
core   +2 more sources

Transient Blurring of the Scintillation Arc of Pulsar B1737+13

The Astrophysical Journal
For many pulsars, the scattering structures responsible for scintillation are typically dominated by a single, thin screen along the line of sight, which persists for years or decades.
Yen-Hua Chen, Sammy Siegel, Daniel Baker, Ue-Li Pen, Dan Stinebring   +4 more
doaj   +1 more source