Journal articles
Wide-band, low-frequency pulse profiles of 100 radio pulsars with LOFAR
M. Pilia
1
J.W.T. Hessels
1
B.W Stappers
2
V.I. Kondratiev
1
M Kramer
3
J van Leeuwen
4
P Weltevrede
2
A Lyne
2
K Zagkouris
5
T.E. Hassall
6
A.V. Bilous
7
R.P. Breton
6
H Falcke
1
Jean-Mathias Grießmeier
8, 9
E Keane
10
A Karastergiou
11
M Kuniyoshi
12
A Noutsos
12
S. Osłowski
13
M. Serylak
14
C. Sobey
1
S ter Veen
1
A Alexov
15
A Anderson
16
A Asgekar
1
A Avruch
17
M Bell
18
M Bentum
1
G Bernardi
19
L. Bîrzan
20
A Bonafede
21
B Breitling
22
J Broderick
5
M Brüggen
23
C Ciardi
24
Stéphane Corbel
25, 9
D de Geus
1
A de Jong
26
A Deller
1
S Duscha
1
J Eislöffel
27
R Fallows
28
R Fender
29
C Ferrari
30
W Frieswijk
1
M.A Garrett
1
A Gunst
1
J.P. Hamaker
1
H Heald
1
A Horneffer
12
P Jonker
17
J Juette
31
G Kuper
1
P Maat
1
M Mann
32
S Markoff
4
R Mcfadden
1
D. Mckay-Bukowski
33
C Miller-Jones
34
A Nelles
35
H. Paas
36
M Pandey-Pommier
37
M. Pietka
5
P Pizzo
1
P Polatidis
37
R Reich
12
R Röttgering
20
A. Rowlinson
38
S Schwarz
39
O Smirnov
40
S Steinmetz
41
S Stewart
42
S Swinbank
43
Michel Tagger
8
Y Tang
44
C Tasse
45
S Thoudam
46
C Toribio
1
A van der Horst
4
R Vermeulen
1
C Vocks
32
R van Weeren
17
R.A.M.J Wijers
47
R Wijnands
4
S Wijnholds
1
O Wucknitz
48
P Zarka
45
H Falcke 1
Author
Jean-Mathias Grießmeier 8, 9
Author Employer institution : Université d'Orléans IdHAL : jean-mathias-griessmeier arXiv : https://arxiv.org/a/griessmeier IdRef : https://www.idref.fr/235780871 ORCID : https://orcid.org/0000-0003-3362-7996 VIAF : https://viaf.org/viaf/20837572 ISNI : http://isni.org/isni/0000000020640428
E E Keane 10
Author
a A Karastergiou 11
Author
S J Swinbank 43
Author
Michel Tagger 8
Author IdHAL : michel-tagger ResearcherId : http://www.researcherid.com/rid/O-6615-2014 IdRef : https://www.idref.fr/097156310 ORCID : https://orcid.org/0000-0003-2962-3220
Y Tang 44
Author
C C Tasse 45
Author
1
ASTRON - Netherlands Institute for Radio Astronomy (Oude Hoogeveensedijk 4, 7991 PD Dwingeloo / PO Box 2, 7990 AA Dwingeloo - Netherlands)
2
Jodrell Bank Centre for Astrophysics (M13 9PL;Manchester - United Kingdom)
- University of Manchester [Manchester] (Oxford Rd, Manchester M13 9PL - United Kingdom)
3
VUMC - Vrije Universiteit Medical Centre (PO Box 7057 1007 MB Amsterdam - Netherlands)
- VU - Vrije Universiteit Amsterdam [Amsterdam] (De Boelelaan 1105 1081 HV Amsterdam - Netherlands)
4
AI PANNEKOEK - Astronomical Institute Anton Pannekoek (PO Box 94249, 1090 GE Amsterdam - Netherlands)
- UvA - University of Amsterdam [Amsterdam] (Spui 21 1012 WX Amsterdam - Netherlands)
5
Oxford Astrophysics (Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK - United Kingdom)
- University of Oxford [Oxford] (Wellington Square, Oxford OX1 2JD - United Kingdom)
6
School of Physics and Astronomy [Southampton] (Highfield, Southampton SO17 1BJ - United Kingdom)
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7
IMAPP - Institute for Mathematics, Astrophysics and Particle Physics (P.O. Box 9010, 6500 GL Nijmegen - Netherlands)
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20
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22
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23
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Structural Dynamics and Acoustics (Netherlands)
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Abstract : Context. LOFAR offers the unique capability of observing pulsars across the 10−240 MHz frequency range with a fractional bandwidth of roughly 50%. This spectral range is well suited for studying the frequency evolution of pulse profile morphology caused by both intrinsic and extrinsic effects such as changing emission altitude in the pulsar magnetosphere or scatter broadening by the interstellar medium, respectively. Aims. The magnitude of most of these effects increases rapidly towards low frequencies. LOFAR can thus address a number of open questions about the nature of radio pulsar emission and its propagation through the interstellar medium. Methods. We present the average pulse profiles of 100 pulsars observed in the two LOFAR frequency bands: high band (120–167 MHz, 100 profiles) and low band (15–62 MHz, 26 profiles). We compare them with Westerbork Synthesis Radio Telescope (WSRT) and Lovell Telescope observations at higher frequencies (350 and 1400 MHz) to study the profile evolution. The profiles were aligned in absolute phase by folding with a new set of timing solutions from the Lovell Telescope, which we present along with precise dispersion measures obtained with LOFAR. Results. We find that the profile evolution with decreasing radio frequency does not follow a specific trend; depending on the geometry of the pulsar, new components can enter into or be hidden from view. Nonetheless, in general our observations confirm the widening of pulsar profiles at low frequencies, as expected from radius-to-frequency mapping or birefringence theories.
Keywords :
stars: neutron
pulsars: general
Document type :
Journal articles
Domain :
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Submitted on : Tuesday, February 14, 2017 - 10:56:24 AM
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Contributor : Nathalie Rouchon <>
Submitted on : Tuesday, February 14, 2017 - 10:56:24 AM
Last modification on : Tuesday, February 16, 2021 - 10:10:09 AM
Long-term archiving on: : Monday, May 15, 2017 - 1:12:00 PM
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Identifiers
- HAL Id : insu-01467174, version 1
- DOI : 10.1051/0004-6361/201425196
- ARXIV : 1509.06396
- BIBCODE : 2016A&A...586A..92P
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Citation
M. Pilia, J.W.T. Hessels, B.W Stappers, V.I. Kondratiev, M Kramer, et al.. Wide-band, low-frequency pulse profiles of 100 radio pulsars with LOFAR. Astronomy and Astrophysics - A&A, EDP Sciences, 2016, 586 (A92), 34 p. ⟨10.1051/0004-6361/201425196⟩. ⟨insu-01467174⟩
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