- 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.
Number of results to display per page
Search Results
- 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/A+A/291/155
- Title:
- Rotating neutron stars models. I.
- Short Name:
- J/A+A/291/155
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- (no description available)
- ID:
- ivo://CDS.VizieR/J/A+AS/108/455
- Title:
- Rotating neutron stars models. II.
- Short Name:
- J/A+AS/108/455
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- (no description available)
- 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.
- ID:
- ivo://CDS.VizieR/J/A+A/513/A65
- Title:
- Rotation measures in the fourth Galactic quadrant
- Short Name:
- J/A+A/513/A65
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have re-examined the published rotation measures (RMs) of extragalactic point sources and pulsars with |b|<3{deg} to study the magnetic field in the fourth Galactic quadrant. We reduced the influence of structure in electron density as much as possible by excluding objects for which H{alpha}-data indicate large fluctuations in n_e_ somewhere along the line of sight. We also excluded objects for which the RM may have been significantly "corrupted" by an intervening supernova remnant. We modelled RM(l), the longitude dependence of RM of the unaffected extragalactic sources and pulsars. We assumed several geometries for the large-scale field. All but one of those are based on logarithmic spiral arms (with various pitch angles and widths), while one has circular symmetry. We also made different assumptions about the large-scale n_e_-distribution.
- ID:
- ivo://CDS.VizieR/J/ApJ/736/138
- Title:
- RXTE observations of 4U 0142+61
- Short Name:
- J/ApJ/736/138
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- After at least six years of quiescence, anomalous X-ray pulsar (AXP) 4U 0142+61 entered an active phase in 2006 March that lasted several months and included six X-ray bursts as well as many changes in the persistent X-ray emission. The bursts, the first seen from this AXP in >11yr of Rossi X-Ray Timing Explorer monitoring, all occurred in the interval between 2006 April 6 and 2007 February 7. The burst durations ranged from (0.4-1.8)x10^3^s. The first five burst spectra are well modeled by blackbodies, with temperatures kT~2-9keV. However, the sixth burst had a complicated spectrum that is well characterized by a blackbody plus two emission features whose amplitude varied throughout the burst. The most prominent feature was at 14.0keV. Upon entry into the active phase, the pulsar showed a significant change in pulse morphology and a likely timing glitch. The glitch had a total frequency jump of (1.9+/-0.4)x10^-7^Hz, which recovered with a decay time of 17+/-2 days by more than the initial jump, implying a net spin-down of the pulsar. Within the framework of the magnetar model, the net spin-down of the star could be explained by regions of the superfluid that rotate slower than the rest. The bursts, flux enhancements, and pulse morphology changes can be explained as arising from crustal deformations due to stresses imposed by the highly twisted internal magnetic field. However, unlike other AXP outbursts, we cannot account for a major twist being implanted in the magnetosphere.
- ID:
- ivo://CDS.VizieR/J/MNRAS/462/4371
- Title:
- Sample of faint X-ray pulsators
- Short Name:
- J/MNRAS/462/4371
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report on the discovery of 41 new pulsating sources in the data of the Chandra Advanced CCD Imaging Spectrometer, which is sensitive to X-ray photons in the 0.3-10 keV band. The archival data of the first 15 yr of Chandra observations were retrieved and analysed by means of fast Fourier transforms, employing a peak-detection algorithm able to screen candidate signals in an automatic fashion. We carried out the search for new X-ray pulsators in light curves with more than 50 photons, for a total of about 190000 light curves out of about 430000 extracted. With these numbers, the ChAndra Timing Survey at Brera And Roma astronomical observatories (CATS @ BAR) - as we called the project - represents the largest ever systematic search for coherent signals in the classic X-ray band. More than 50 per cent of the signals were confirmed by further Chandra (for those sources with two or more pointings), XMM-Newton or ROSAT data. The period distribution of the new X-ray pulsators above ~2000s resembles that of cataclysmic variables, while there is a paucity of sources with shorter period and low fluxes. Since there is not an obvious bias against these detections, a possible interpretation is in terms of a magnetic gating mechanism in accreting neutron stars. Finally, we note that CATS @ BAR is a living project and the detection algorithm will continue to be routinely applied to the new Chandra data as they become public. Based on the results obtained so far, we expect to discover about three new pulsators every year.
- ID:
- ivo://CDS.VizieR/J/AZh/84/685
- Title:
- Scattering of pulsar radio emission
- Short Name:
- J/AZh/84/685
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Measurements of the broadening of pulsar pulses by scattering in the interstellar medium are presented for a complete sample of 100 pulsars with Galactic longitudes from 6{deg} to 311{deg} and distances to three kiloparsec. The dependences of the scattering on the dispersion measure (tau_sc_(DM){prop.to}DM^alpha^), frequency (tau_sc_(nu){prop.to}nu^-gamma^), Galactic longitude, and distance to the pulsar are analyzed.
- ID:
- ivo://CDS.VizieR/J/ApJ/869/66
- Title:
- Search for extraterrestrial intelligence with ATA
- Short Name:
- J/ApJ/869/66
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report a novel radio autocorrelation search for extraterrestrial intelligence. For selected frequencies across the terrestrial microwave window (1-10GHz), observations were conducted at the Allen Telescope Array to identify artificial non-sinusoidal periodic signals with radio bandwidths greater than 4Hz, which are capable of carrying substantial messages with symbol rates from 4 to 10^6^Hz. Out of 243 observations, about half (101) were directed toward sources with known continuum flux >~1Jy over the sampled bandwidth (quasars, pulsars, supernova remnants, and masers), based on the hypothesis that they might harbor heretofore undiscovered natural or artificial repetitive, phase or frequency modulation. The rest of the observations were directed mostly toward exoplanet stars with no previously discovered continuum flux. No signals attributable to extraterrestrial technology were found in this study. We conclude that the maximum probability that future observations like the ones described here will reveal repetitively modulated emissions is less than 5% for continuum sources and exoplanets alike. The paper concludes by describing a new approach to expanding this survey to many more targets and much greater sensitivity using archived data from interferometers all over the world.
