Dual-frequency single-pulse study of PSR B0950+08
Artikel i vetenskaplig tidskrift, 2022
PSR B0950+08 is a bright nonrecycled pulsar whose single-pulse fluence variability is reportedly large. Based on observations at two widely separated frequencies, 55 MHz (NenuFAR) and 1.4 GHz (Westerbork Synthesis Radio Telescope), we review the properties of these single pulses. We conclude that they are more similar to ordinary pulses of radio emission than to a special kind of short and bright giant pulses, observed from only a handful of pulsars. We argue that a temporal variation of the properties of the interstellar medium along the line of sight to this nearby pulsar, namely the fluctuating size of the decorrelation bandwidth of diffractive scintillation makes an important contribution to the observed single-pulse fluence variability. We further present interesting structures in the low-frequency single-pulse spectra that resemble the "sad trombones"seen in fast radio bursts (FRBs); although for PSR B0950+08 the upward frequency drift is also routinely present. We explain these spectral features with radius-to-frequency mapping, similar to the model developed by Wang et al. (2019, ApJ, 876, L15) for FRBs. Finally, we speculate that μs-scale fluence variability of the general pulsar population remains poorly known, and that its further study may bring important clues about the nature of FRBs.
Stars: neutron
Författare
A. V. Bilous
Netherlands Institute for Radio Astronomy (ASTRON)
J.M. Grießmeier
Universite d'Orleans
Station de Radioastronomie de Nançay
T. Pennucci
National Radio Astronomy Observatory
Eötvös Loránd University (ELTE)
Z. Wu
Universität Bielefeld
L. Bondonneau
Universite d'Orleans
Centre national de la recherche scientifique (CNRS)
V. Kondratiev
Netherlands Institute for Radio Astronomy (ASTRON)
Russian Academy of Sciences
J. van Leeuwen
Netherlands Institute for Radio Astronomy (ASTRON)
Anton Pannekoek Institute for Astronomy
Y. Maan
Netherlands Institute for Radio Astronomy (ASTRON)
National Centre for Radio Astrophysics India
L. Connor
California Institute of Technology (Caltech)
Anton Pannekoek Institute for Astronomy
L. C. Oostrum
Netherlands eScience Center
Anton Pannekoek Institute for Astronomy
Netherlands Institute for Radio Astronomy (ASTRON)
E. Petroff
McGill University
Anton Pannekoek Institute for Astronomy
J. P.W. Verbiest
Universität Bielefeld
Max-Planck-Gesellschaft
D. Vohl
Anton Pannekoek Institute for Astronomy
Netherlands Institute for Radio Astronomy (ASTRON)
J. W. Mckee
Institut canadien d'astrophysique théorique
G. Shaifullah
Universita' degli Studi di Milano-Bicocca
G. Theureau
Universite d'Orleans
LUTH - Laboratoire de l'Univers et de ses Theories
Station de Radioastronomie de Nançay
O. M. Ulyanov
National Academy of Sciences in Ukraine
B. Cecconi
Centre national de la recherche scientifique (CNRS)
A. H.W.M. Coolen
Netherlands Institute for Radio Astronomy (ASTRON)
S. Corbel
Station de Radioastronomie de Nançay
Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA)
Sieds Damstra
Netherlands Institute for Radio Astronomy (ASTRON)
H. Dénes
Netherlands Institute for Radio Astronomy (ASTRON)
J. N. Girard
Centre national de la recherche scientifique (CNRS)
B. Hut
Netherlands Institute for Radio Astronomy (ASTRON)
Marianna Ivashina
Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk
O. O. Konovalenko
National Academy of Sciences in Ukraine
A. M. Kutkin
Russian Academy of Sciences
Netherlands Institute for Radio Astronomy (ASTRON)
G. M. Loose
Netherlands Institute for Radio Astronomy (ASTRON)
H. Mulder
Netherlands Institute for Radio Astronomy (ASTRON)
Mark Ruiter
Netherlands Institute for Radio Astronomy (ASTRON)
R. Smits
Netherlands Institute for Radio Astronomy (ASTRON)
P. L. Tokarsky
National Academy of Sciences in Ukraine
N. Vermaas
Netherlands Institute for Radio Astronomy (ASTRON)
V. V. Zakharenko
National Academy of Sciences in Ukraine
P.M. Zarka
Centre national de la recherche scientifique (CNRS)
J. Ziemke
Netherlands Institute for Radio Astronomy (ASTRON)
Universitetet i Oslo
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 658 A143Ämneskategorier
Meteorologi och atmosfärforskning
Astronomi, astrofysik och kosmologi
Atom- och molekylfysik och optik
DOI
10.1051/0004-6361/202142242