Distribution of interstellar plasma in the direction of PSR B0525+21 from data obtained on a ground–space interferometer
- Authors: Andrianov A.S.1, Smirnova T.V.2, Shishov V.I.2, Gwinn C.3, Popov M.V.1
- 
							Affiliations: 
							- Astro Space Center, Lebedev Physical Institute
- Pushchino Radio Astronomy Observatory, Astro Space Center
- University of California at Santa Barbara
 
- Issue: Vol 61, No 6 (2017)
- Pages: 513-520
- Section: Article
- URL: https://journals.rcsi.science/1063-7729/article/view/190816
- DOI: https://doi.org/10.1134/S1063772917060014
- ID: 190816
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Abstract
Observations on the RadioAstron ground–space interferometer with the participation of the Green Bank and Arecibo ground telescopes at 1668 MHz have enabled studies of the characteristics of the interstellar plasma in the direction of the pulsar PSR B0525+21. The maximum projected baseline for the ground–space interferometer was 233 600 km. The scintillations in these observations were strong, and the spectrum of inhomogeneties in the interstellar plasma was a power law with index n = 3.74, corresponding to a Kolmogorov spectrum. A new method for estimating the size of the scattering disk was applied to estimate the scattering angle (scattering disk radius) in the direction toward PSR B0525+21, θscat = 0.028 ± 0.002 milliarcsecond. The scattering in this direction occurs in a plasma layer located at a distance of 0.1Z from the pulsar, where Z is the distance from the pulsar to the observer. For the adopted distance Z = 1.6 kpc, the screen is located at a distance of 1.44 kpc from the observer.
About the authors
A. S. Andrianov
Astro Space Center, Lebedev Physical Institute
							Author for correspondence.
							Email: andrian@asc.rssi.ru
				                					                																			                												                	Russian Federation, 							Moscow, 117997						
T. V. Smirnova
Pushchino Radio Astronomy Observatory, Astro Space Center
														Email: andrian@asc.rssi.ru
				                					                																			                												                	Russian Federation, 							Pushchino						
V. I. Shishov
Pushchino Radio Astronomy Observatory, Astro Space Center
														Email: andrian@asc.rssi.ru
				                					                																			                												                	Russian Federation, 							Pushchino						
C. Gwinn
University of California at Santa Barbara
														Email: andrian@asc.rssi.ru
				                					                																			                												                	United States, 							Santa Barbara, California						
M. V. Popov
Astro Space Center, Lebedev Physical Institute
														Email: andrian@asc.rssi.ru
				                					                																			                												                	Russian Federation, 							Moscow, 117997						
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