Results 71 to 80 of about 736 (212)

Gravitational Interstellar Scintillation

, 2008
Gravitation could modulate the interstellar scintillation of pulsars in a way that is analogous to refractive interstellar scintillation (RISS). While RISS occurs when a large ionized cloud crosses the pulsar line-of-sight, gravitational interstellar scintillation (GISS) occurs when a compact gravitational deflector lies very near to that line-of-sight.
openaire   +2 more sources

Interstellar scintillation studies of pulsars and distribution of scattering plasma in the local interstellar medium [PDF]

, 2001
Pulsar scintillation measurements from the Ooty Radio Telescope (ORT) are used to investigate the distribution of scattering in the Local Interstellar Medium (LISM; region of ≤ 1 kpc of the Sun), specifically the region in and around the Local ...
Gupta, Yashwant, Rao, A. Pramesh, Preethi, P. B., Bhat, N. D. Ramesh   +3 more
core   +1 more source

SPICE: Scintillation Pipeline for Interferometric Candidate Extraction

The Astronomical Journal
We present Scintillation Pipeline for Interferometric Candidate Extraction (SPICE) an automated CASA-based pipeline developed to identify pulsar candidates in Giant Metrewave Radio Telescope (GMRT) and upgraded GMRT (uGMRT) data through their diffractive
Jitendra Salal, Shriharsh Tendulkar, Visweshwar Ram Marthi   +2 more
doaj   +1 more source

The Impact of Interstellar Scintillation on Astrometric VLBI [PDF]

, 2004
IVS 2004 General Meeting ProceedingsWe review the evidence demonstrating the interstellar scintillation (ISS) is the principal mechanism responsible for the intra-day variability (IDV) seen at cm wavelengths in many compact, flat-spectrum extra-galactic ...
Macquart, Jean-Pierre, Lovell, James, Titov, Oleg, Rickett, Barney J., Kedziora-Chudczer, Lucyna, Bignall, Hayley E., Ojha, Roopesh, Koyama, Yasuhiro, Fey, Alan L., Jauncey, David, Tzioumis, Anastasios K.   +10 more
core   +1 more source

Scintillation Properties of PSR B1133+16 Measured with Very Long Baseline Interferometry

The Astrophysical Journal
The scintillation of pulsars reveals the small-scale structure of the interstellar medium. A powerful technique for characterizing the scintillating structures (screens) combines analysis of scintillation arcs and very long baseline interferometry (VLBI).
Ashley M. Stock, Fardin Syed, Marten H. van Kerkwijk, Rebecca Lin, Franz Kirsten, Ue-Li Pen   +5 more
doaj   +1 more source

Refractive interstellar scintillation in 1741-038

The Astrophysical Journal, 1986
A year of VLA observations of the radio source 1741-038 show that it exhibits pronounced variability at 1.49, 15, and 22 GHz, and somewhat reduced activity at 4.9 GHz. We interpret the unusually strong 1.49 GHz variability as due to refractive interstellar scintillation, and the high-frequency variability as being intrinsic to the source.
R. M. Hjellming, Ramesh Narayan
openaire   +1 more source

The interstellar turbulent plasma spectrum in the direction to PSR B1642-03 from multi-frequency observations of interstellar scintillation [PDF]

, 2006
Multi-frequency observations of interstellar scintillation toward the pulsar PSR B1642-03 were analyzed to estimate the spectrum of interstellar plasma inhomogeneities in the direction of this pulsar. Using data over the frequency range from 103 MHz to 5 
W. Sieber, S. A. Tyul'bashev, A. Jessner, V. M. Malofeev, V. A. Potapov, T. V. Smirnova, V. I. Shishov, R. Wielebinski, D. R. Stinebring   +8 more
core   +1 more source

Refractive interstellar scintillation of pulsar intensities at 74 MHz [PDF]

, 1993
Results of daily observations of the flux of nine pulsars made with a large phased-array at 74 MHz from January 24, 1989 for 400 d are presented. Modulation indices and time scales are estimated for the variations.
Gupta, Y., Coles, W. A., Rickett, B. J.
core   +2 more sources

The NANOGrav 12.5 yr Data Set: Probing Interstellar Turbulence and Precision Pulsar Timing with PSR J1903+0327

The Astrophysical Journal
Free electrons in the interstellar medium refract and diffract radio waves along multiple paths, resulting in angular and temporal broadening of radio pulses that limits pulsar timing precision.
Abra Geiger, James M. Cordes, Michael T. Lam, Stella Koch Ocker, Shami Chatterjee, Zaven Arzoumanian, Ava L. Battaglia, Harsha Blumer, Paul R. Brook, Olivia A. Combs, H. Thankful Cromartie, Megan E. DeCesar, Paul B. Demorest, Timothy Dolch, Justin A. Ellis, Robert D. Ferdman, Elizabeth C. Ferrara, Emmanuel Fonseca, Nate Garver-Daniels, Peter A. Gentile, Deborah C. Good, Megan L. Jones, Duncan R. Lorimer, Jing Luo, Ryan S. Lynch, Maura A. McLaughlin, Cherry Ng, David J. Nice, Timothy T. Pennucci, Nihan S. Pol, Scott M. Ransom, Renée Spiewak, Ingrid H. Stairs, Kevin Stovall, Joseph K. Swiggum, Sarah J. Vigeland   +35 more
doaj   +1 more source

Precision orbital dynamics from interstellar scintillation arcs for PSR J0437-4715 [PDF]

, 2020
Intensity scintillations of radio pulsars are known to originate from interference between waves scattered by the electron density irregularities of interstellar plasma, often leading to parabolic arcs in the two-dimensional power spectrum of the ...
Dai, Shi (R20363), Dai, Shi, Hobbs, George B., Bailes, Matthew, Reardon, Daniel J., Zhu, Xing-Jiang, Zhu, Xingjiang, Bhat, ND Ramesh, Parthasarathy, Aditya, Manchester, Richard N., Coles, William A, Shannon, Ryan M, Russell, Christopher J., Hobbs, George B, Spiewak, Renee, Walker, Mark A., Reardon, Daniel J, Tuntsov, Artem V, Bhat, N. D. Ramesh, Wang, Jingbo, Manchester, Richard N, Zhang, Lei, Toomey, Lawrence, Coles, William A., Osłowski, Stefan, Russell, Christopher J, Shannon, Ryan M., Kerr, Matthew, Walker, Mark A, Tuntsov, Artem V., Oslowski, Stefan, van Straten, Willem   +31 more
core   +2 more sources