scholarly journals Two years of pulsar observations with the ultra-wide-band receiver on the Parkes radio telescope

2021 ◽  
Vol 502 (1) ◽  
pp. 1253-1262
Author(s):  
Simon Johnston ◽  
C Sobey ◽  
S Dai ◽  
M Keith ◽  
M Kerr ◽  
...  
Keyword(s):  
Supernova Remnant ◽  
Narrow Band ◽  
Band System ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Galactic Centre ◽  
Dispersion Measure ◽  
Density Measurements ◽  
Rotation Measure ◽  
Strong Mode

ABSTRACT The major programme for observing young, non-recycled pulsars with the Parkes telescope has transitioned from a narrow-band system to an ultra-wide-band system capable of observing between 704 and 4032 MHz. We report here on the initial 2 yr of observations with this receiver. Results include dispersion measure (DM) and Faraday rotation measure (RM) variability with time, determined with higher precision than hitherto, flux density measurements and the discovery of several nulling and mode changing pulsars. PSR J1703−4851 is shown to be one of a small subclass of pulsars that has a weak and a strong mode which alternate rapidly in time. PSR J1114−6100 has the fourth highest |RM| of any known pulsar despite its location far from the Galactic Centre. PSR J1825−1446 shows variations in both DM and RM likely due to its motion behind a foreground supernova remnant.

scholarly journals On the magnetoionic environments of fast radio bursts

2020 ◽  
Vol 499 (1) ◽  
pp. 355-361 ◽  
Author(s):  
Wei-Yang Wang ◽  
Bing Zhang ◽  
Xuelei Chen ◽  
Renxin Xu
Keyword(s):  
Magnetic Field ◽  
Mean Value ◽  
Line Of Sight ◽  
Galactic Centre ◽  
Dispersion Measure ◽  
Radio Bursts ◽  
Host Galaxies ◽  
Surface Magnetic Field ◽  
Rotation Measure ◽  
The Mean

ABSTRACT Observations of the Faraday rotation measure, combined with the dispersion measure, can be used to infer the magnetoionic environment of a radio source. We investigate the magnetoionic environments of fast radio bursts (FRBs) by deriving their estimated average magnetic field strengths along the line of sight 〈B∥〉 in their host galaxies and comparing them with those of Galactic pulsars and magnetars. We find that for those FRBs with RM measurements, the mean 〈B∥〉 are $1.77^{+9.01}_{-1.48}\, \rm \mu G$ and $1.74^{+14.82}_{-1.55}\, \rm \mu G$ using two different methods, which is slightly larger but not inconsistent with the distribution of Galactic pulsars, $1.00^{+1.51}_{-0.60}\, \rm \mu G$. Only six Galactic magnetars have estimated 〈B∥〉. Excluding PSR J1745–2900 that has an anomalously high value due to its proximity with the Galactic Centre, the other five sources have a mean value of $1.70\, \rm \mu G$, which is statistically consistent with the 〈B∥〉 distributions of both Galactic pulsars and FRBs. There is no apparent trend of evolution of magnetar 〈B∥〉 as a function of age or surface magnetic field strength. Galactic pulsars and magnetars close to the Galactic Centre have relatively larger 〈B∥〉 values than other pulsars/magnetars. We discuss the implications of these results for the magnetoionic environments of FRB 121102 within the context of magnetar model and the model invoking a supermassive black hole, and for the origin of FRBs in general.

Novel rapid acquisition method for ultra-wide band system

2009 ◽  
Vol 29 (9) ◽  
pp. 2435-2436
Author(s):  
Xiu-zhen WANG ◽  
Zheng-qi ZHENG ◽  
Ying-ni JIN ◽  
Yan-bo ZHANG
Keyword(s):  
Band System ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Rapid Acquisition ◽  
Acquisition Method

Power Consumption Analysis of a Bluetooth over Ultra Wide Band System

2007 ◽  
Author(s):  
Alexandre Lewicki ◽  
Javier Del Prado Pavon ◽  
Jo Degraef ◽  
Jacky Talayssat ◽  
Gilles Jacquemod
Keyword(s):  
Power Consumption ◽  
Band System ◽  
Wide Band ◽  
Ultra Wide Band
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