The LOFAR Tied-Array All-Sky Survey: Timing of 35 radio pulsars and an overview of the properties of the LOFAR pulsar discoveries
Journal article, 2023
The LOFAR Tied-Array All-Sky Survey (LOTAAS) is the most sensitive untargeted radio pulsar survey performed at low radio frequencies (119-151 MHz) to date and has discovered 76 new radio pulsars, including the 23.5-s pulsar J0250+5854, which up until recently was the slowest spinning radio pulsar known. In this paper, we report on the timing solutions of 35 pulsars discovered by LOTAAS, which include a nulling pulsar and a mildly recycled pulsar, and thereby complete the full timing analysis of the LOTAAS pulsar discoveries. We give an overview of the findings from the full LOTAAS sample of 76 pulsars, discussing their pulse profiles, radio spectra, and timing parameters. We found that the pulse profiles of some of the pulsars show profile variations in time or frequency, and while some pulsars show signs of scattering, a large majority display no pulse broadening. The LOTAAS discoveries have on average steeper radio spectra and longer spin periods (1.4×), as well as lower spin-down rates (3.1×) compared to the known pulsar population. We discuss the cause of these differences and attribute them to a combination of selection effects of the LOTAAS survey as well as previous pulsar surveys, though we cannot rule out that older pulsars tend to have steeper radio spectra.
Pulsars: general
Author
E. Van Der Wateren
Netherlands Institute for Radio Astronomy (ASTRON)
Radboud University
C. G. Bassa
Netherlands Institute for Radio Astronomy (ASTRON)
S. Cooper
University of Manchester
J. M. Grieβmeier
Université Paris PSL
University of Orléans
B. W. Stappers
University of Manchester
J. W. T. Hessels
Netherlands Institute for Radio Astronomy (ASTRON)
Anton Pannekoek Institute for Astronomy
V. I. Kondratiev
Netherlands Institute for Radio Astronomy (ASTRON)
D. Michilli
Massachusetts Institute of Technology (MIT)
C. M. Tan
McGill University
C. Tiburzi
Istituto nazionale di astrofisica (INAF)
P. Weltevrede
University of Manchester
A. S. Bak Nielsen
Max Planck Society
Bielefeld University
Tobia Carozzi
Chalmers, Space, Earth and Environment, Onsala Space Observatory
B. Ciardi
Max Planck Society
I. Cognard
Université Paris PSL
University of Orléans
R. -J. Dettmar
Ruhr-Universität Bochum
A. Karastergiou
University of Oxford
M.A. Kramer
Max Planck Society
University of Manchester
J. Künsemöller
Bielefeld University
S. Osłowski
Manly Astrophysics
M. Serylak
University of the Western Cape
SKA Organisation
C. Vocks
Leibniz Institute for Astrophysics Potsdam
O. Wucknitz
Max Planck Society
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 669 A160Subject Categories
Astronomy, Astrophysics and Cosmology
Atom and Molecular Physics and Optics
Other Physics Topics
DOI
10.1051/0004-6361/202245122