scholarly journals Pulse Properties of a few Southern Pulsars at 150 MHz

2000 ◽  
Vol 177 ◽  
pp. 171-172
Author(s):  
Nalini H. Issur ◽  
Avinash A. Deshpande
Keyword(s):  
Radio Telescope ◽  
Pulse Sequences ◽  
Single Pulse ◽  
Millisecond Pulsar ◽  
Preliminary Results

AbstractWe present 150 MHz observations of the bright millisecond pulsar J0437-4715, and pulsars J1453-6413 and J1752-2806, made with the Mauritius Radio Telescope (MRT). We use single-pulse sequences to derive some preliminary results on the pulse morphologies.

scholarly journals Multifrequency Study of Periodic Nulling and Subpulse Drifting in Pulsar J2048−1616

2021 ◽  
Vol 923 (2) ◽  
pp. 259
Author(s):  
Z. Wang ◽  
Z. G. Wen ◽  
J. P. Yuan ◽  
N. Wang ◽  
J. L. Chen ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Radio Telescope ◽  
Pulse Sequences ◽  
Single Pulse ◽  
Central Core ◽  
Central Component ◽  
Pulse Emission ◽  
Physical Mechanisms ◽  
The Core ◽  
Fluctuation Rate

Abstract We have carried out a detailed study of single-pulse emission from the pulsar J2048−1616 (B2045−16), observed at 732, 1369, and 3100 MHz frequencies using the Parkes 64 m radio telescope. The pulsar possesses three well-resolved emission components, with the central component resembling core emission. The single pulses show the presence of two distinct periodic modulations using fluctuation spectral analysis. About 12% nulls are found to create alternating bunches of nulls and bursts in a quasiperiodic manner with longer periodicities of 83, 28, and 14 rotational periods for simultaneous observations at 732 and 3100 MHz. At 1369 MHz, the quasiperiodic nulling is detected, as well, to modulate across the entire profile both in the core and conal components simultaneously with a fluctuation rate of about 50 rotational periods, and the nulling fraction is estimated to be around 10%. Additionally, the quasiperiodic modulations are significantly dependent on time. In addition to nulling, the pulsar also presents subpulse drifting in the single-pulse sequences with shorter periodicity. The subpulse drifting is presented in the conal components and is absent in the central core emission. The leading component is modulated in longitude with a period of three pulses. The trailing component remains phase stationary within the pulse window but periodically modulates in amplitude with a period of three pulses. Finally, possible physical mechanisms are discussed.

scholarly journals The SUrvey for pulsars and extragalactic radio bursts V: recent discoveries and full timing solutions

2020 ◽  
Vol 496 (4) ◽  
pp. 4836-4848 ◽  
Author(s):  
R Spiewak ◽  
C Flynn ◽  
S Johnston ◽  
E F Keane ◽  
M Bailes ◽  
...  
Keyword(s):  
Southern Hemisphere ◽  
Radio Telescope ◽  
Large Fraction ◽  
Single Pulse ◽  
Radio Bursts ◽  
Millisecond Pulsar ◽  
Folding Algorithm ◽  
Fourier Techniques

ABSTRACT The SUrvey for Pulsars and Extragalactic Radio Bursts ran from 2014 April to 2019 August, covering a large fraction of the Southern hemisphere at mid- to high-galactic latitudes and consisting of 9-min pointings taken with the 20-cm multibeam receiver on the Parkes Radio Telescope. Data up to 2017 September 21 have been searched using standard Fourier techniques, single-pulse searches, and Fast Folding Algorithm searches. We present 19 new discoveries, bringing the total to 27 discoveries in the programme, and we report the results of follow-up timing observations at Parkes for 26 of these pulsars, including the millisecond pulsar PSR J1421−4409; the faint, highly modulated, slow pulsar PSR J1646−1910; and the nulling pulsar PSR J1337−4441. We present new timing solutions for 23 pulsars, and we report flux densities, modulation indices, and polarization properties.

scholarly journals MRT Observations of the MSP J0437–4715 at 150 MHz

2004 ◽  
Vol 218 ◽  
pp. 345-346
Author(s):  
Nalini H. Issur ◽  
Avinash A. Deshpande
Keyword(s):  
Radio Telescope ◽  
Single Pulse ◽  
Millisecond Pulsar

We report some results based on 150 MHz observations of the millisecond pulsar J0437–4715 carried out using the Mauritius Radio Telescope (MRT). For the single pulse properties we also consider 327 MHz data from the Ooty Radio Telescope.

scholarly journals Unusual frequency dependence of the integrated profile of the millisecond pulsar PSR J2145-0705

1996 ◽  
Vol 160 ◽  
pp. 285-286
Author(s):  
A.D. Kuzmin ◽  
B.Ya. Losovski
Keyword(s):  
Frequency Dependence ◽  
Radio Telescope ◽  
High Frequency ◽  
Separation Method ◽  
Dependence Analysis ◽  
Millisecond Pulsar ◽  
Pulse Profile ◽  
Component Structure ◽  
Frequency Measurements ◽  
Gaussian Fit

We report on observations and frequency dependence analysis of the integrated profile of the millisecond pulsar PSR J2145-0705. Observations were performed at 102 MHz with the BSA radio telescope in Pushchino.To analyze the frequency dependence of the integrated profile we supplemented our data with high frequency measurements by Bailes et al. (unpublished). For frequency dependence analysis we used the Gaussian fit separation method of presentation the integrated pulse profile as a superposition of Gaussian-shaped individual components (Wu, Xu and Rankin 1992; Foster, Fairhead and Backer 1991). A good fit is provided by four component structure, suggested by Bailes et al. 1994.

scholarly journals IPS Observations at Miyun Station, BAO

2001 ◽  
Vol 203 ◽  
pp. 580-582
Author(s):  
X.Z. Zhang ◽  
J.H. Wu
Keyword(s):  
Radio Telescope ◽  
Data Reduction ◽  
Astronomical Observatory ◽  
Paper Briefly ◽  
Preliminary Results

IPS observations have recently begun at Miyun Station, Beijing Astronomical Observatory. This paper briefly describes the radio telescope at Miyun Station, discusses the observation and the data reduction procedures and presents the preliminary results of observations on IPS source 3C48.

scholarly journals Radio light-curve for WR 146 (HM19-3, WC6+O8.5), a colliding wind binary

1999 ◽  
Vol 193 ◽  
pp. 390-391
Author(s):  
Diah Y.A. Setia Gunawan ◽  
A. Ger de Bruyn ◽  
Karel A. van der Hucht ◽  
Peredur M. Williams
Keyword(s):  
Light Curve ◽  
Flux Density ◽  
Radio Telescope ◽  
Time Scale ◽  
Preliminary Results ◽  
Average Flux

We report preliminary results of monitoring the flux from the Wolf-Rayet object WR 146 with the Westerbork Synthesis Radio Telescope at 21 cm since 1989. We find the average flux density slowly rising in the period 1989–1997, with evidence of shorter time-scale variability.

scholarly journals IPS Observations at Miyun Station, BAO

2001 ◽  
Vol 182 ◽  
pp. 189-192 ◽  
Author(s):  
J. Wu ◽  
X. Zhang ◽  
Y. Zheng
Keyword(s):  
Radio Telescope ◽  
Data Reduction ◽  
Astronomical Observatory ◽  
Paper Briefly ◽  
Preliminary Results

AbstractIPS observations have recently begun at Miyun Station, Beijing Astronomical Observatory. This paper briefly describes the radio telescope at Miyun Station, discusses the observation and the data reduction procedures, and presents the preliminary results of observations on IPS source 3C48.

scholarly journals PAFINDER – Searching for FRBs and pulsars using Phased Array Feeds

2017 ◽  
Vol 13 (S337) ◽  
pp. 370-371
Author(s):  
Mateusz Malenta ◽  
Ewan Barr ◽  
Aaron Chippendale ◽  
Xinping Deng ◽  
Daniel George ◽  
...  
Keyword(s):  
Real Time ◽  
Radio Telescope ◽  
Phased Array ◽  
Single Pulse ◽  
Radio Bursts ◽  
Pulse Detection ◽  
Phased Array Feeds

AbstractThe challenges of detecting and localising Fast Radio Bursts in real time can be met with the use of Phased Array Feeds. One such system, capable of creating up to 36 simultaneous beams, is currently being commissioned at the Effelsberg radio telescope in Germany following testing at the 64 m Parkes radio telescope. The PAFINDER (Phased Array Feed FRB Finder) pipeline will be used with this receiver to enable real–time single–pulse detection and localisation.

scholarly journals H I Emission and Absorption in the Southern Galactic Plane Survey

2001 ◽  
Vol 18 (1) ◽  
pp. 84-90 ◽  
Author(s):  
N. M. McClure-Griffiths ◽  
John M. Dickey ◽  
B. M. Gaensler ◽  
A. J. Green ◽  
R. F. Haynes ◽  
...  
Keyword(s):  
Power Spectrum ◽  
Radio Telescope ◽  
Large Scale ◽  
Galactic Plane ◽  
Pilot Project ◽  
Small Scale ◽  
Preliminary Results ◽  
Test Region ◽  
Scale Structures ◽  
Spatial Power Spectrum

AbstractWe present preliminary results from the Southern Galactic Plane Survey (SGPS) Test Region and Parkes data. As part of the pilot project for the Southern Galactic Plane Survey, observations of a Test Region (325·5° ≤l ≤ 333·5°; −0·5° ≤ b ≤ 3·5°) were completed in December 1998. Single-dish observations of the full survey region (253° ≤ l ≤ 358 ° |b| ≤ 1°) with the Parkes Radio Telescope were completed in March 2000. We present a sample of SGPS H I data, with particular attention to the smallest-and largest-scale structures seen in absorption and emission, respectively. On the large scale, we detect many prominent H I shells. On the small scale, we note extremely compact, cold clouds seen in H I self-absorption. We explore how these two classes of objects probe opposite ends of the H I spatial power spectrum.

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