Results 21 to 30 of about 40,021 (212)

The NANOGrav 12.5 yr Data Set: Observations and Narrowband Timing of 47 Millisecond Pulsars

open access: yesAstrophysical Journal Supplement Series, 2020
We present time-of-arrival (TOA) measurements and timing models of 47 millisecond pulsars observed from 2004 to 2017 at the Arecibo Observatory and the Green Bank Telescope by the North American Nanohertz Observatory for Gravitational Waves (NANOGrav ...
Md F. Alam   +69 more
semanticscholar   +1 more source

Microarcsecond VLBI Pulsar Astrometry with PSRπ II. Parallax Distances for 57 Pulsars [PDF]

open access: yesAstrophysical Journal, 2018
We present the results of PSRπ, a large astrometric project targeting radio pulsars using the Very Long Baseline Array (VLBA). From our astrometric database of 60 pulsars, we have obtained parallax-based distance measurements for all but 3, with a ...
A. Deller   +10 more
semanticscholar   +1 more source

Timing of young radio pulsars – I. Timing noise, periodic modulation, and proper motion [PDF]

open access: yesMonthly notices of the Royal Astronomical Society, 2019
The smooth spin-down of young pulsars is perturbed by two non-deterministic phenomenon, glitches, and timing noise. Although the timing noise provides insights into nuclear and plasma physics at extreme densities, it acts as a barrier to high-precision
A. Parthasarathy   +12 more
semanticscholar   +1 more source

THE NANOGRAV NINE-YEAR DATA SET: MASS AND GEOMETRIC MEASUREMENTS OF BINARY MILLISECOND PULSARS [PDF]

open access: yes, 2016
We analyze 24 binary radio pulsars in the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) nine-year data set. We make 14 significant measurements of the Shapiro delay, including new detections in four pulsar-binary systems (PSRs ...
E. Fonseca   +19 more
semanticscholar   +1 more source

Bunching Coherent Curvature Radiation in Three-dimensional Magnetic Field Geometry: Application to Pulsars and Fast Radio Bursts [PDF]

open access: yesAstrophysical Journal, 2017
The extremely high brightness temperatures of pulsars and fast radio bursts (FRBs) require their radiation mechanisms to be coherent. Coherent curvature radiation from bunches has been long discussed as the mechanism for radio pulsars and recently for ...
Yuanpei Yang, Bing Zhang
semanticscholar   +1 more source

Spectral properties of 441 radio pulsars [PDF]

open access: yes, 2017
We present a study of the spectral properties of 441 pulsars observed with the Parkes radio telescope near the centre frequencies of 728, 1382 and 3100 MHz.
F. Jankowski   +12 more
semanticscholar   +1 more source

Pulsars [PDF]

open access: yesPhysics Today, 1968
THE DISCOVERY OF PULSARS, or rapidly pulsating radio sources, was, like certain other historic events in astronomy, an accident. It is reminiscent of the unexpected detection of radio bursts from Jupiter by Bernard F. Burke and Kenneth L. Franklin, who were studying the Crab Nebula, and of the discovery of the cosmic fireball radiation by Arno A ...
Stephen P. Maran, A. G. W. Cameron
  +4 more sources

First search for gravitational waves from known pulsars with Advanced LIGO [PDF]

open access: yes, 2017
We present the result of searches for gravitational waves from 200 pulsars using data from the first observing run of the Advanced LIGO detectors. We find no significant evidence for a gravitational-wave signal from any of these pulsars, but we are able ...
The Ligo Scientific Collaboration   +499 more
semanticscholar   +1 more source

Lessons from HAWC pulsar wind nebulae observations: The diffusion constant is not a constant; pulsars remain the likeliest sources of the anomalous positron fraction; cosmic rays are trapped for long periods of time in pockets of inefficient diffusion [PDF]

open access: yesPhysical Review D, 2018
Author(s): Profumo, Stefano; Reynoso-Cordova, Javier; Kaaz, Nicholas; Silverman, Maya | Abstract: Recent TeV observations of nearby pulsars with the HAWC telescope have been interpreted as evidence that the diffusion of high-energy electrons and ...
S. Profumo   +3 more
semanticscholar   +1 more source

The observed velocity distribution of young pulsars [PDF]

open access: yes, 2017
We argue that comparison with observations of theoretical models for the velocity distribution of pulsars must be done directly with the observed quantities, i.e. parallax and the two components of proper motion.
F. Verbunt, A. Igoshev, E. Cator
semanticscholar   +1 more source

Home - About - Disclaimer - Privacy