|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Radio emission evolution, polarimetry and multifrequency single pulse analysis of the radio magnetar PSR J1622-4950 | | L. Levin
; M. Bailes
; S. D. Bates
; N. D. R. Bhat
; M. Burgay
; S. Burke-Spolaor
; N. D'Amico
; S. Johnston
; M. J. Keith
; M. Kramer
; S. Milia
; A. Possenti
; B. Stappers
; W. van Straten
; | | Date: |
10 Apr 2012 | | Abstract: | Here we report on observations of the radio magnetar PSR J1622-4950 at
frequencies from 1.4 to 17 GHz. We show that although its flux density is
varying up to a factor of ~10 within a few days, it has on average decreased by
a factor of 2 over the last 700 days. At the same time, timing analysis
indicates a trend of decreasing spin-down rate over our entire data set, again
of about a factor of 2 over 700 days, but also an erratic variability in the
spin-down rate within this time span. Integrated pulse profiles are often close
to 100 per cent linearly polarized, but large variations in both the profile
shape and fractional polarization are regularly observed. Furthermore, the
behaviour of the position angle of the linear polarization is very complex -
offsets in both the absolute position angle and the phase of the position angle
sweep are often seen and the occasional presence of orthogonal mode jumps
further complicates the picture. However, model fitting indicates that the
magnetic and rotation axes are close to aligned. Finally, a single pulse
analysis has been carried out at four observing frequencies, demonstrating that
the wide pulse profile is built up of narrow spikes of emission, with widths
that scale inversely with observing frequency. All three of the known radio
magnetars seem to have similar characteristics, with highly polarized emission,
time-variable flux density and pulse profiles, and with spectral indices close
to zero. | | Source: | arXiv, 1204.2045 | | 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