Results 91 to 100 of about 79,833 (199)
Lensing Point-spread Function of Coherent Astrophysical Sources and Nontrivial Wave Effects
The Astrophysical JournalMost research on astrophysical lensing has been conducted using the geometric optics framework, where there exists a clear concept of lensing images. However, wave optics effects can be important for coherent sources, e.g., pulsars, fast radio bursts ...
Xun Shi
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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
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The Astrophysical Journal LettersWe report a direct measurement of the electron density turbulence parameter C _1 , enabled by 550–750 MHz baseband observations with the upgraded Giant Metrewave Radio Telescope.
Visweshwar Ram Marthi, Yogesh Maan
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Pulsar Scattering as a Probe for Structures in the Interstellar Medium
The Astrophysical JournalDue 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
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The Pulsar Science Collaboratory: Multiepoch Scintillation Studies of Pulsars
The Astrophysical JournalWe 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 +15 more
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Interstellar scintillation as a cosmological probe: Prospects and challenges [PDF]
, 2012 The discovery that interstellar scintillation (ISS) is suppressed for compact radiosources at z 2 has enabled ISS surveys to be used as cosmological probes.
J. Koay (23314963) +9 more
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NE2025: An Updated Electron Density Model for the Galactic Interstellar Medium
The Astrophysical JournalFree 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
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Long-term Monitoring of Scintillation in the Pulsar J0332+5434
The Astrophysical JournalChanges 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 +12 more
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Interstellar scintillation of three nearby pulsars with FAST
Journal of High Energy AstrophysicsInterstellar scintillation probes the properties of the ionized interstellar medium as well as the dynamical behavior of pulsars themselves. Using the Five-hundred-meter Aperture Spherical Radio Telescope, we obtained hour-long observations of PSRs~J0837+0610, J1136+1551, and J1239+2453.
Ying-Ying Ren +7 more
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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.
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