Publications (54)
A glitch in the millisecond pulsar J0613-0200
J. W. McKee, G. H. Janssen, B. W. Stappers +17
We present evidence for a small glitch in the spin evolution of the millisecond pulsar J06130200, using the EPTA Data Release 1.0, combined with Jodrell Bank analogue filterbank…
Searches for signatures of ultra-light axion dark matter in polarimetry data of the European Pulsar Timing Array
N. K. Porayko, P. Usynina, J. Terol-Calvo +74
Ultra-light axion-like particles (ALPs) can be a viable solution to the dark matter problem. The scalar field associated with ALPs, coupled to the electromagnetic field, acts as an…
The second data release from the European Pulsar Timing Array: VI. Challenging the ultralight dark matter paradigm
Clemente Smarra, Boris Goncharov, Enrico Barausse +68
Pulsar Timing Array experiments probe the presence of possible scalar or pseudoscalar ultralight dark matter particles through decade-long timing of an ensemble of galactic millise…
The second data release from the European Pulsar Timing Array: IV. Implications for massive black holes, dark matter and the early Universe
J. Antoniadis, P. Arumugam, S. Arumugam +111
The European Pulsar Timing Array (EPTA) and Indian Pulsar Timing Array (InPTA) collaborations have measured a low-frequency common signal in the combination of their second and fir…
Charge densities above pulsar polar caps
A. Jessner, H. Lesch, T. Kunzl
The ability of the neutron star surface to supply all or only part of the charges filling the pulsar magnetosphere is crucial for the physics prevailing within it, with direct cons…
Simultaneous single-pulse observations of radio pulsars: I. The polarization characteristics of PSR B0329+54
A. Karastergiou, A. von Hoensbroech, M. Kramer +6
We present the first results from a programme of multi-frequency simultaneous single pulse observations carried out as part of the European Pulsar Network. We detail the main data…
A current circuit model of pulsar radio emission
Th. Kunzl, H. Lesch, A. Jessner
We present the outline of a new model for the coherent radio emission of pulsars that succeeds in reproducing the energetics and brightness temperatures of the observed radio emiss…
High-precision timing of 42 millisecond pulsars with the European Pulsar Timing Array
G. Desvignes, R. N. Caballero, L. Lentati +40
We report on the high-precision timing of 42 radio millisecond pulsars (MSPs) observed by the European Pulsar Timing Array (EPTA). This EPTA Data Release 1.0 extends up to mid-2014…
International Colloquium "Scattering and Scintillation in Radio Astronomy" was held on June 19-23, 2006 in Pushchino, Moscow region, Russia
V. I. Shishov, W. A. Coles, B. J. Rickett +52
Topics of the Colloquium: a) Interplanetary scintillation b) Interstellar scintillation c) Modeling and physical origin of the interplanetary and the interstellar plasma turbulence…
A millisecond pulsar in an extremely wide binary system
C. G. Bassa, G. H. Janssen, B. W. Stappers +30
We report on 22 yrs of radio timing observations of the millisecond pulsar J10240719 by the telescopes participating in the European Pulsar Timing Array (EPTA). These observatio…
Polarization characteristics of the Crab pulsar's giant radio pulses at HFCs phases
A. Slowikowska, A. Jessner, B. Klein +1
We discuss our recent discovery of the giant radio emission from the Crab pulsar at its high frequency components (HFCs) phases and show the polarization characteristic of these pu…
The geometry of PSR B0031-07
R. Smits, D. Mitra, B. Stappers +4
Here we present the results from an analysis of a multifrequency simultaneous observation of PSR B003107. We have constructed a geometrical model, based on an empirical relation…
Simultaneous multi-frequency single-pulse properties of AXP XTE J1810-197
M. Serylak, B. W. Stappers, P. Weltevrede +6
We have used the 76-m Lovell, 94-m equivalent WSRT and 100-m Effelsberg radio telescopes to investigate the simultaneous single-pulse properties of the radio emitting magnetar AXP…
On the Possibility of Curvature Radiation from Radio Pulsars
H. Lesch, A. Jessner, M. Kramer +1
We consider the widespread hypothesis that coherent curvature radiation is responsible for the radio emission of pulsars. The comparison of energy conservation and the published da…
Radio spectrum of the AXP J1810-197 and of its profile components
K. Lazaridis, A. Jessner, M. Kramer +5
As part of a European Pulsar Network (EPN) multi-telescope observing campaign, we performed simultaneous multi-frequency observations at 1.4, 4.9 and 8.4 GHz during July 2006 and q…
The Geometry of PSR B0031-07
J. M. Smits, D. Mitra, B. W. Stappers +4
PSR B0031-07 is well known to exhibit three different modes of drifting sub-pulses (mode A, B and C). It has recently been shown that in a multifrequency observation, consisting of…
Pulsar Physics at Low Frequencies
J. A. Eilek, T. H. Hankins, A. Jessner
Recent work has made it clear that the ``standard model'' of pulsar radio emission cannot be the full answer. Some fundamental assumptions about the magnetic field and plasma flow…
The second data release from the European Pulsar Timing Array I. The dataset and timing analysis
J. Antoniadis, S. Babak, A. -S. Bak Nielsen +66
Pulsar timing arrays offer a probe of the low-frequency gravitational wave spectrum (1 - 100 nanohertz), which is intimately connected to a number of markers that can uniquely trac…
Flux-density spectral analysis for several pulsars and two newly-identified gigahertz-peaked spectra
M. Dembska, J. Kijak, A. Jessner +3
In this paper we present results from flux density measurements for 21 pulsars over a wide frequency range, using the Giant Metrewave Radio Telescope (GMRT) and the Effelsberg tele…
A flexible format for exchanging pulsar data
D. R. Lorimer, A. Jessner, J. H. Seiradakis +6
We describe a data format currently in use amongst European institutions for exchanging and archiving pulsar data. The format is designed to be as flexible as possible with regard…
The second data release from the European Pulsar Timing Array V. Search for continuous gravitational wave signals
J. Antoniadis, P. Arumugam, S. Arumugam +97
We present the results of a search for continuous gravitational wave signals (CGWs) in the second data release (DR2) of the European Pulsar Timing Array (EPTA) collaboration. The m…
Long term monitoring of mode switching for PSR B0329+54
J. L. Chen, H. G. Wang, N. Wang +5
The mode switching phenomenon of PSR B0329+54 is investigated based on the long-term monitoring from September 2003 to April 2009 made with the Urumqi 25m radio telescope at 1540 M…
The second data release from the European Pulsar Timing Array III. Search for gravitational wave signals
J. Antoniadis, P. Arumugam, S. Arumugam +95
We present the results of the search for an isotropic stochastic gravitational wave background (GWB) at nanohertz frequencies using the second data release of the European Pulsar T…
The characteristics of millisecond pulsar emission: II. Polarimetry
K. M. Xilouris, M. Kramer, A. Jessner +5
We have made polarimetric monitoring observations of millisecond pulsars visible from the northern hemisphere at 1410 MHz. Their emission properties are compared with those of norm…
Natural Limits for Currents in Charge Separated Pulsar Magnetospheres
A. Jessner, H. Lesch, T. Kunzl
Rough estimates and upper limits on current and particle densities form the basis of most of the canonical pulsar models. Whereas the surface of the rotating neutron star is capabl…
The second data release from the European Pulsar Timing Array II. Customised pulsar noise models for spatially correlated gravitational waves
J. Antoniadis, P. Arumugam, S. Arumugam +95
The nanohertz gravitational wave background (GWB) is expected to be an aggregate signal of an ensemble of gravitational waves emitted predominantly by a large population of coalesc…
Spectrum management and compatibility studies with Python
B. Winkel, A. Jessner
We developed the pycraf Python package, which provides functions and procedures for various tasks related to spectrum-management compatibility studies. This includes an implementat…
Observations of pulsars at 9 millimetres
O. Loehmer, A. Jessner, M. Kramer +2
The behaviour of the pulsar spectrum at high radio frequencies can provide decisive information about the nature of the radio emission mechanism. We report recent observations of a…
The international pulsar timing array project: using pulsars as a gravitational wave detector
G. Hobbs, A. Archibald, Z. Arzoumanian +55
The International Pulsar Timing Array project combines observations of pulsars from both Northern and Southern hemisphere observatories with the main aim of detecting ultra-low fre…
The Effelsberg Search for Pulsars in the Galactic Centre
M. Kramer, B. Klein, D. R. Lorimer +3
We report the status of a search for pulsars in the Galactic Centre, using a completely revised and improved high-sensitivity double-horn system at 4.85-GHz. We also present calcul…
Comparing recent PTA results on the nanohertz stochastic gravitational wave background
The International Pulsar Timing Array Collaboration, G. Agazie, J. Antoniadis +242
The Australian, Chinese, European, Indian, and North American pulsar timing array (PTA) collaborations recently reported, at varying levels, evidence for the presence of a nanohert…
The binary pulsar PSR J1811-1736: evidence of a low amplitude supernova kick
A. Corongiu, M. Kramer, B. W. Stappers +5
Aims: The binary pulsar PSR J1811-1736 has been identified, since its discovery, as a member of a double neutron star system. Observations of such binary pulsars allow the measurem…
Giant Radio Pulses from the Crab Pulsar
A. Jessner, A. Slowikowska, B. Klein +4
Individual giant radio pulses (GRPs) from the Crab pulsar last only a few microseconds. However, during that time they rank among the brightest objects in the radio sky reaching pe…
Pulse to pulse flux density modulation from pulsars at 8.35 GHz
O. Maron, M. Serylak, J. Kijak +3
Aims. To investigate the flux density modulation from pulsars and the existence of specific behaviour of modulation index versus frequency. Methods. Several pulsars have been obser…
Pulsars with gigahertz-peaked spectra
J. Kijak, W. Lewandowski, O. Maron +2
We investigate a high frequency turn-over effect in radio spectra for pulsars with positive or flat spectral index. Using GMRT and Effelsberg observatory, we estimated the flux den…
Microwave plasma emission of a flare on AD Leo
A. V. Stepanov, B. Kliem, V. V. Zaitsev +5
An intense radio flare on the dMe star AD Leo, observed with the Effelsberg radio telescope and spectrally resolved in a band of 480 MHz centred at 4.85 GHz is analysed. A lower li…
Orbital variability of the PSR J2051-0827 Binary System
O. Doroshenko, O. Loehmer, M. Kramer +4
We have carried out high-precision timing measurements of the binary millisecond pulsar PSR J20510827 with the Effelsberg 100-m radio telescope of the Max-Planck-Institut für R…
Polarized radio emission from a magnetar
M. Kramer, B. W. Stappers, A. Jessner +2
We present polarization observations of the radio emitting magnetar AXP J1810-197. Using simultaneous multi-frequency observations performed at 1.4, 4.9 and 8.4 GHz, we obtained po…
Evidence for gravitational quadrupole moment variations in the companion of PSR J2051-0827
K. Lazaridis, J. P. W. Verbiest, T. M. Tauris +11
We have conducted radio timing observations of the eclipsing millisecond binary pulsar J2051-0827 with the European Pulsar Timing Array network of telescopes and the Parkes radio t…
An Asteroid Belt Interpretation for the Timing Variations of the Millisecond Pulsar B1937+21
R. M. Shannon, J. M. Cordes, T. S. Metcalfe +10
Pulsar timing observations have revealed companions to neutron stars that include other neutron stars, white dwarfs, main-sequence stars, and planets. We demonstrate that the corre…
Multi-telescope timing of PSR J1518+4904
G. H. Janssen, B. W. Stappers, M. Kramer +5
PSR J1518+4904 is one of only 9 known double neutron star systems. These systems are highly valuable for measuring the masses of neutron stars, measuring the effects of gravity, an…
Generic tests of the existence of the gravitational dipole radiation and the variation of the gravitational constant
K. Lazaridis, N. Wex, A. Jessner +10
We present results from the high precision timing analysis of the pulsar-white dwarf (WD) binary PSR J1012+5307 using 15 years of multi-telescope data. Observations were performed…
Placing limits on the stochastic gravitational-wave background using European Pulsar Timing Array data
R. van Haasteren, Y. Levin, G. H. Janssen +16
Direct detection of low-frequency gravitational waves ( Hz) is the main goal of pulsar timing array (PTA) projects. One of the main targets for the PTAs is to me…
Practical approaches to analyzing PTA data: Cosmic strings with six pulsars
Hippolyte Quelquejay Leclere, Pierre Auclair, Stanislav Babak +69
We search for a stochastic gravitational wave background (SGWB) generated by a network of cosmic strings using six millisecond pulsars from Data Release 2 (DR2) of the European Pul…
21-year timing of the black-widow pulsar J2051-0827
G. Shaifullah, J. P. W. Verbiest, P. C. C. Freire +23
Timing results for the black-widow pulsar J2051-0827 are presented, using a 21-year dataset from four European Pulsar Timing Array telescopes and the Parkes radio telescope. This d…
The characteristics of millisecond pulsar emission: I. Spectra, pulse shapes and the beaming fraction
M. Kramer, K. M. Xilouris, D. Lorimer +5
We have monitored a large sample of millisecond pulsars using the 100-m Effelsberg radio telescope in order to compare their radio emission properties to the slowly rotating popula…
Unintended electromagnetic radiation from Starlink satellites detected with LOFAR between 110 and 188 MHz
F. Di Vruno, B. Winkel, C. G. Bassa +4
We report on observations of 68 satellites belonging to the SpaceX Starlink constellation with the LOFAR radio telescope. Radiation associated with Starlink satellites was detected…
A 1400-MHz pilot search for young pulsars
D. R. Lorimer, M. Kramer, P. Mueller +4
We have used the Effelsberg 100-m radio telescope to conduct a 1400-MHz ( 21-cm) search for young and rapidly rotating radio pulsars along a 2 deg strip of the northern Gal…
The Parallax, Mass and Age of the PSR J2145-0750 binary system
O. Loehmer, M. Kramer, T. Driebe +3
We present results of timing measurements of the binary millisecond pulsar PSR J2145-0750. Combining timing data obtained with the Effelsberg and Lovell radio telescopes we measure…
Analysis of single pulse radio flux measurements of PSR B1133+16 at 4.85 and 8.35 GHz
K. Krzeszowski, O. Maron, A. SÅowikowska +2
We show the results of microsecond resolution radio data analysis focused on flux measurements of single pulses of PSR B1133+16. The data were recorded at 4.85 GHz and 8.35 GHz wit…
Tests of Gravitational Symmetries with Pulsar Binary J1713+0747
W. W. Zhu, G. Desvignes, N. Wex +50
Symmetries play an important role in modern theories of gravity. The strong equivalence principle (SEP) constitutes a collection of gravitational symmetries which are all implement…
The characteristics of millisecond pulsar emission: III.From low to high frequencies
M. Kramer, C. Lange, D. R. Lorimer +4
In this paper we present the first observations of a large sample of millisecond pulsars at frequencies of 2.7 GHz and 4.9 GHz. Our new flux measurements extend the known spectra f…
Comparison of giant radio pulses in young pulsars and millisecond pulsars
A. Slowikowska, A. Jessner, G. Kanbach +1
Pulse-to-pulse intensity variations are a common property of pulsar radio emission. For some of the objects single pulses are often 10-times stronger than their average pulse. The…
Flicker noise pulsar radio spectra
K. Krzeszowski, O. Maron, A. SÅowikowska +1
We present new results of fitting 108 spectra of radio pulsars with the flicker noise model proposed by Loehmer et al. (2008) and compare them with the spectral indices of power-la…