|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'501'711
Articles rated: 2609
20 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
PSR B0329+54: Substructure in the scatter-broadened image discovered with RadioAstron on baselines of up to 235,000 km | | M.V. Popov
; A.S. Andrianov
; N. Bartel
; C.R. Gwinn
; M.D. Johnson
; B.C. Joshi
; N.S. Kardashev
; R. Karuppusamy
; Y.Y. Kovalev
; M. Kramer
; A.G. Rudnitskii
; E.R. Safutdinov
; V.I. Shishov
; T.V. Smirnova
; V.A. Soglasnov
; J.A. Zensus
; V.I. Zhuravlev
; | | Date: |
19 Jan 2015 | | Abstract: | We studied scattering properties of the pulsar PSR B0329+54 with a
ground-space radio interferometer RadioAstron which included the 10-m Space
Radio Telescope, the 110-m Green Bank Telescope, the 14x25-m Westerbork
Synthesis Radio Telescope, and the 64-m Kalyazin Radio Telescope. The
observations were performed at 324 MHz on baselines of up to 235,000 km in
November 2012 and January 2014. At short ground-space baselines of less than
about 20,000 km, the visibility amplitude decreases with the projected baseline
length, providing a direct measurement of the diameter of the scattering disk
of 4.7$pm$0.9 mas. The size of the diffraction spot near Earth is
15,000$pm$3,000 km. At longer baselines of up to 235,000 km, where no
interferometric detection of the scattering disk would be expected, significant
visibilities were observed with amplitudes scattered around a constant value.
These detections result in a discovery of a substructure in the completely
resolved scatter-broadened image of the pointlike source, PSR B0329+54. They
fully attribute to properties of the interstellar medium. The visibility
function at the longest ground-space baselines in the delay domain consists of
many isolated unresolved spikes, in agreement with the amplitude-modulated
noise model. Within the assumption of turbulent as well as large-scale
irregularities in the plasma of the interstellar medium, we estimate that the
effective scattering screen lies 0.35$pm$0.10 of the distance from Earth
toward the pulsar. | | Source: | arXiv, 1501.4449 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER