- ID:
- ivo://CDS.VizieR/J/A+A/469/607
- Title:
- Pulsar subpulse modulation properties at 92cm
- Short Name:
- J/A+A/469/607
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A large sample of pulsars has been observed to study their subpulse modulation at an observing wavelength (when achievable) of both 21 and 92 cm using the Westerbork Synthesis Radio Telescope. In this paper we present the 92-cm data and a comparison is made with the already published 21-cm results. The main goals are to determine what fraction of the pulsars have drifting subpulses, whether those pulsars share some physical properties and to find out if subpulse modulation properties are frequency dependent. We analysed 191 pulsars at 92-cm searching for subpulse modulation using fluctuation spectra. The sample of pulsars is as unbiased as possible towards any particular pulsar characteristics.
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Search Results
- ID:
- ivo://CDS.VizieR/J/A+A/445/243
- Title:
- Pulsar subpulse modulation properties at 21cm
- Short Name:
- J/A+A/445/243
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of a systematic, unbiased search for subpulse modulation of 187 pulsars performed with the Westerbork Synthesis Radio Telescope (WSRT) in the Netherlands at an observing wavelength of 21cm. Using new observations and archival WSRT data we have increased the list of pulsars that show the drifting subpulse phenomenon by 42, indicating that at least one in three pulsars exhibits this phenomenon. The real fraction of pulsars that show the drifting phenomenon is likely to be larger than 55%. The majority of the analysed pulsars show subpulse modulation (170), of which the majority were not previously known to show subpulse modulation and 30 show clear systematic drifting. The large number of new drifters we have found allows us, for the first time, to do meaningful statistics on the drifting phenomenon.
- ID:
- ivo://CDS.VizieR/J/MNRAS/328/855
- Title:
- Pulsar timing at UAO
- Short Name:
- J/MNRAS/328/855
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A pulsar timing system has been operating in the 18-cm band at the Urumqi Astronomical Observatory 25-m telescope since mid-1999. Frequency resolution allowing de-dispersion of the pulsar signals is provided by a 2x128x2.5MHz filterbank/digitizer system. Observations of 74 pulsars over more than 12 months have resulted in updated pulsar periods and period derivatives, as well as improved positions. Comparison with previous measurements showed that the changes in period and period derivative tend to have the same sign and to be correlated in amplitude. A model based on unseen glitches gives a good explanation of the observed changes, suggesting that long-term fluctuations in period and period derivatives are dominated by glitches. In 2000 July, we detected a glitch of relative amplitude {Delta}{nu}/{nu}~24x10^-9^in the Crab pulsar. The post-glitch decay appears similar to other large Crab glitches.
- ID:
- ivo://CDS.VizieR/J/A+A/492/923
- Title:
- Pulsar Timing for Fermi Gamma-ray Space Telescope
- Short Name:
- J/A+A/492/923
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We describe a comprehensive pulsar monitoring campaign for the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST). The detection and study of pulsars in gamma rays give insights into the populations of neutron stars and supernova rates in the Galaxy, into particle acceleration mechanisms in neutron star magnetospheres, and into the "engines" driving pulsar wind nebulae. LAT's unprecedented sensitivity between 20MeV and 300GeV together with its 2.4sr field-of-view makes detection of many gamma-ray pulsars likely, justifying the monitoring of over two hundred pulsars with large spin-down powers. To search for gamma-ray pulsations from most of these pulsars requires a set of phase-connected timing solutions spanning a year or more to properly align the sparse photon arrival times. We describe the choice of pulsars and the instruments involved in the campaign.
- ID:
- ivo://CDS.VizieR/J/AZh/87/238
- Title:
- Pulse profiles of radio pulsars at 102 and 111MHz
- Short Name:
- J/AZh/87/238
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Average profiles for 180, mostly faint, pulsars at 102 and 111MHz are presented. Pulse shapes have been obtained for the first time for most of the faint pulsars (about 50% of the total sample). A comparison with high-frequency data (mostly at 234, 408, 610, 925, and 1408MHz) demonstrates appreciable changes in the profile width and shape with frequency. For most pulsars, the number of components is preserved, but the intensities of individual components can change. As a rule, the profile width increases with decreasing frequency. The possible generation of emission at the cyclotron frequencies is considered.
- ID:
- ivo://CDS.VizieR/J/AZh/79/501
- Title:
- Radio luminosities of normal & millisecond pulsars
- Short Name:
- J/AZh/79/501
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of comparative statistical analysis of the integrated radio luminosities of normal and millisecond pulsars are presented. The analysis is based on our own measurements of the flux densities, spectra and integrated radio luminosities of the millisecond pulsars., as well as data from the literature used to determine the integrated radio luminosities for 545 pulsars.
- ID:
- ivo://CDS.VizieR/J/AZh/71/762
- Title:
- Radio luminosities of 232 pulsars
- Short Name:
- J/AZh/71/762
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Total radio luminosities of 232 pulsars are calculated using new data on mean spectra. For 88% of these pulsars, luminosities lie in the range 10^27^-10^30^erg/s. It is shown that pulsar luminosity remains constant over a period of a few million years. Mean radiation power increases with period P as P^0.5^. An increase in luminosity with the rotational energy loss rate is found.
- ID:
- ivo://CDS.VizieR/J/MNRAS/469/2313
- Title:
- Radio pulsars post-glitchs
- Short Name:
- J/MNRAS/469/2313
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Timing observations of rapidly rotating neutron stars revealed a great number of glitches, observed from both canonical radio pulsars and magnetars. Among them, 76 glitches have shown exponential relaxation(s) with characteristic decay times ranging from several days to a few months, followed by a more gradual recovery. Glitches displaying exponential relaxation with single or multiple decay time constants are analysed in terms of a model based on the interaction of the vortex lines with the toroidal arrangement of flux tubes in the outer core of the neutron star. Model results agree with the observed time-scales in general. Thus, the glitch phenomenon can be used to deduce valuable information about neutron star structure, in particular on the interior magnetic field configuration which is unaccessible from surface observations. One immediate conclusion is that the magnetar glitch data are best explained with a much cooler core and therefore require that direct Urca-type fast-cooling mechanisms should be effective for magnetars.
- ID:
- ivo://CDS.VizieR/J/A+A/439/433
- Title:
- RIJ photometry of stars around PSR B1718-19
- Short Name:
- J/A+A/439/433
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In our paper we present VLT-observations in R, I and J of the candidate companion of PSR B1718-19, and also make use of HST observations in F702W, previously presented in Van Kerkwijk et al., 2000ApJ...529..428V. We make available online our astrometry and photometry including error-bars. The field-size is approximately 34x34 arcsec (F702W), 80x80 arcsec (R & I), and 89x89 arcsec (J).
- ID:
- ivo://CDS.VizieR/J/ApJ/642/868
- Title:
- Rotation measures for 223 pulsars
- Short Name:
- J/ApJ/642/868
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The large-scale magnetic field of our Galaxy can be probed in three dimensions using Faraday rotation of pulsar signals. We report on the determination of 223 rotation measures from polarization observations of relatively distant southern pulsars made using the Parkes radio telescope.
