All Outputs (82)

Dual-frequency single-pulse study of PSR B0950+08 (2022)
Journal Article
Bilous, A. V., Grießmeier, J. M., Pennucci, T., Wu, Z., Bondonneau, L., Kondratiev, V., …Ziemke, J. (2022). Dual-frequency single-pulse study of PSR B0950+08. Astronomy and Astrophysics, 658, Article A143. https://doi.org/10.1051/0004-6361/202142242

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 prop... Read More about Dual-frequency single-pulse study of PSR B0950+08.

The International Pulsar Timing Array second data release: Search for an isotropic gravitational wave background (2022)
Journal Article
Antoniadis, J., Arzoumanian, Z., Babak, S., Bailes, M., Bak Nielsen, A. S., Baker, P. T., …Shaifullah, G. (2022). The International Pulsar Timing Array second data release: Search for an isotropic gravitational wave background. Monthly notices of the Royal Astronomical Society, 510(4), 4873-4887. https://doi.org/10.1093/mnras/stab3418

We searched for an isotropic stochastic gravitational wave background in the second data release of the International Pulsar Timing Array, a global collaboration synthesizing decadal-length pulsar-timing campaigns in North America, Europe, and Austra... Read More about The International Pulsar Timing Array second data release: Search for an isotropic gravitational wave background.

Modelling annual scintillation arc variations in PSR J1643-1224 using the Large European Array for Pulsars (2022)
Journal Article
Mall, G., Main, R. A., Antoniadis, J., Bassa, C. G., Burgay, M., Chen, S., …Zhu, W. W. (2022). Modelling annual scintillation arc variations in PSR J1643-1224 using the Large European Array for Pulsars. Monthly notices of the Royal Astronomical Society, 511(1), 1104-1114. https://doi.org/10.1093/mnras/stac096

In this work, we study variations in the parabolic scintillation arcs of the binary millisecond pulsar PSR J1643-1224 over five years using the Large European Array for Pulsars (LEAP). The two-dimensional (2D) power spectrum of scintillation, called... Read More about Modelling annual scintillation arc variations in PSR J1643-1224 using the Large European Array for Pulsars.

Localizing FRBs through VLBI with the Algonquin Radio Observatory 10 m Telescope (2022)
Journal Article
Cassanelli, T., Leung, C., Rahman, M., Vanderlinde, K., Mena-Parra, J., Cary, S., …Tendulkar, S. P. (2022). Localizing FRBs through VLBI with the Algonquin Radio Observatory 10 m Telescope. Astronomical Journal, 163(2), Article 65. https://doi.org/10.3847/1538-3881/ac3d2f

The Canadian Hydrogen Intensity Mapping Experiment (CHIME)/FRB experiment has detected thousands of fast radio bursts (FRBs) due to its sensitivity and wide field of view; however, its low angular resolution prevents it from localizing events to thei... Read More about Localizing FRBs through VLBI with the Algonquin Radio Observatory 10 m Telescope.

Study of 72 Pulsars Discovered in the PALFA Survey: Timing Analysis, Glitch Activity, Emission Variability, and a Pulsar in an Eccentric Binary (2022)
Journal Article
Parent, E., Sewalls, H., Freire, P. C., Matheny, T., Lyne, A. G., Perera, B. B., …Zhu, W. W. (2022). Study of 72 Pulsars Discovered in the PALFA Survey: Timing Analysis, Glitch Activity, Emission Variability, and a Pulsar in an Eccentric Binary. The Astrophysical journal, 924(2), Article 135. https://doi.org/10.3847/1538-4357/ac375d

We present new discoveries and results from long-term timing of 72 pulsars discovered in the Pulsar Arecibo L-band Feed Array (PALFA) survey, including precise determination of astrometric and spin parameters, and flux density and scatter broadening... Read More about Study of 72 Pulsars Discovered in the PALFA Survey: Timing Analysis, Glitch Activity, Emission Variability, and a Pulsar in an Eccentric Binary.

Common-red-signal analysis with 24-yr high-precision timing of the European Pulsar Timing Array: inferences in the stochastic gravitational-wave background search (2021)
Journal Article
Chen, S., Caballero, R. N., Guo, Y. J., Chalumeau, A., Liu, K., Shaifullah, G., …Xu, H. (2021). Common-red-signal analysis with 24-yr high-precision timing of the European Pulsar Timing Array: inferences in the stochastic gravitational-wave background search. Monthly notices of the Royal Astronomical Society, 508(4), 4970-4993. https://doi.org/10.1093/mnras/stab2833

We present results from the search for a stochastic gravitational-wave background (GWB) as predicted by the theory of General Relativity using six radio millisecond pulsars from the Data Release 2 (DR2) of the European Pulsar Timing Array (EPTA) cove... Read More about Common-red-signal analysis with 24-yr high-precision timing of the European Pulsar Timing Array: inferences in the stochastic gravitational-wave background search.

Removal and replacement of interference in tied-array radio pulsar observations using the spectral kurtosis estimator (2021)
Journal Article
Purver, M., Bassa, C. G., Cognard, I., Janssen, G. H., Karuppusamy, R., Kramer, M., …Stappers, B. W. (2022). Removal and replacement of interference in tied-array radio pulsar observations using the spectral kurtosis estimator. Monthly notices of the Royal Astronomical Society, 510(2), 1597-1611. https://doi.org/10.1093/mnras/stab3434

We describe how to implement the spectral kurtosis method of interference removal (zapping) on a digitized signal of averaged power values. Spectral kurtosis is a hypothesis test, analogous to the t-test, with a null hypothesis that the amplitudes fr... Read More about Removal and replacement of interference in tied-array radio pulsar observations using the spectral kurtosis estimator.

Noise analysis in the European Pulsar Timing Array data release 2 and its implications on the gravitational-wave background search (2021)
Journal Article
Chalumeau, A., Babak, S., Petiteau, A., Chen, S., Samajdar, A., Caballero, R. N., …Xu, H. (2022). Noise analysis in the European Pulsar Timing Array data release 2 and its implications on the gravitational-wave background search. Monthly notices of the Royal Astronomical Society, 509(4), 5538-5558. https://doi.org/10.1093/mnras/stab3283

The European Pulsar Timing Array (EPTA) collaboration has recently released an extended data set for six pulsars (DR2) and reported evidence for a common red noise signal. Here we present a noise analysis for each of the six pulsars. We consider seve... Read More about Noise analysis in the European Pulsar Timing Array data release 2 and its implications on the gravitational-wave background search.

PSR J2222-0137: I. Improved physical parameters for the system (2021)
Journal Article
Guo, Y. J., Freire, P. C., Guillemot, L., Kramer, M., Zhu, W. W., Wex, N., …Theureau, G. (2021). PSR J2222-0137: I. Improved physical parameters for the system. Astronomy and Astrophysics, 654, Article A16. https://doi.org/10.1051/0004-6361/202141450

Context. The PSR J2222-0137 binary system has a set of features that make it a unique laboratory for tests of gravity theories. Aims. To fully exploit the system's potential for these tests, we aim to improve the measurements of its physical paramete... Read More about PSR J2222-0137: I. Improved physical parameters for the system.

Strong-field gravity tests with the double pulsar (2021)
Journal Article
Kramer, M., Stairs, I. H., Manchester, R. N., Wex, N., Deller, A. T., Coles, W. A., …Theureau, G. (2021). Strong-field gravity tests with the double pulsar. Physical Review X, 11(4), Article 041050. https://doi.org/10.1103/PhysRevX.11.041050

Continued timing observations of the double pulsar PSR J0737-3039A/B, which consists of two active radio pulsars (A and B) that orbit each other with a period of 2.45 h in a mildly eccentric (e=0.088) binary system, have led to large improvements in... Read More about Strong-field gravity tests with the double pulsar.

Profile changes associated with dispersion measure events in PSR J1713+0747 (2021)
Journal Article
Lin, F. X., Lin, H. H., Luo, J., Main, R., McKee, J., Pen, U. L., …van Kerkwijk, M. H. (2021). Profile changes associated with dispersion measure events in PSR J1713+0747. Monthly notices of the Royal Astronomical Society, 508(1), 1115-1127. https://doi.org/10.1093/mnras/stab2529

Propagation effects in the interstellar medium and intrinsic profile changes can cause variability in the timing of pulsars, which limits the accuracy of fundamental science done via pulsar timing. One of the best timing pulsars, PSR J1713+0747, has... Read More about Profile changes associated with dispersion measure events in PSR J1713+0747.

Pulsars with NenuFAR: Backend and pipelines (2021)
Journal Article
Bondonneau, L., Grießmeier, J. M., Theureau, G., Cognard, I., Brionne, M., Kondratiev, V., …Tasse, C. (2021). Pulsars with NenuFAR: Backend and pipelines. Astronomy and Astrophysics, 652, https://doi.org/10.1051/0004-6361/202039339

Context. NenuFAR (New extension in Nançay upgrading LOFAR) is a new radio telescope developed and built on the site of the Nançay Radio Observatory. It is designed to observe the largely unexplored frequency window from 10 to 85 MHz, offering a high... Read More about Pulsars with NenuFAR: Backend and pipelines.

A multi-approach and multi-scale platform to model CD4+ T cells responding to infections (2021)
Journal Article
Wertheim, K. Y., Puniya, B. L., La Fleur, A., Shah, A. R., Barberis, M., & Helikar, T. (2021). A multi-approach and multi-scale platform to model CD4+ T cells responding to infections. PLoS Computational Biology, 17(8), Article e1009209. https://doi.org/10.1371/journal.pcbi.1009209

Immune responses rely on a complex adaptive system in which the body and infections interact at multiple scales and in different compartments. We developed a modular model of CD4+ T cells, which uses four modeling approaches to integrate processes at... Read More about A multi-approach and multi-scale platform to model CD4+ T cells responding to infections.

Refined mass and geometric measurements of the high-mass PSR J0740+6620 (2021)
Journal Article
Fonseca, E., Cromartie, H. T., Pennucci, T. T., Ray, P. S., Kirichenko, A. Y., Ransom, S. M., …Zhu, W. W. (2021). Refined mass and geometric measurements of the high-mass PSR J0740+6620. Astrophysical journal. Letters, 915(1), Article L12. https://doi.org/10.3847/2041-8213/ac03b8

We report results from continued timing observations of PSR J0740+6620, a high-mass, 2.8 ms radio pulsar in orbit with a likely ultracool white dwarf companion. Our data set consists of combined pulse arrival-time measurements made with the 100 m Gre... Read More about Refined mass and geometric measurements of the high-mass PSR J0740+6620.

The CHIME Pulsar Project: System Overview (2021)
Journal Article
Amiri, M., Bandura, K. M., Boyle, P. J., Brar, C., Cliche, J. F., Crowter, K., …Wang, X. (2021). The CHIME Pulsar Project: System Overview. Astrophysical Journal Supplement, 255(1), Article 5. https://doi.org/10.3847/1538-4365/abfdcb

We present the design, implementation, and performance of the digital pulsar observing system constructed for the Canadian Hydrogen Intensity Mapping Experiment (CHIME). Using accelerated computing, this system processes independent, digitally steere... Read More about The CHIME Pulsar Project: System Overview.

Unravelling the physics of multiphase AGN winds through emission line tracers (2021)
Journal Article
Richings, A. J., Faucher-Giguère, C. A., & Stern, J. (2021). Unravelling the physics of multiphase AGN winds through emission line tracers. Monthly notices of the Royal Astronomical Society, 503(2), 1568-1585. https://doi.org/10.1093/mnras/stab556

Observations of emission lines in active galactic nuclei (AGNs) often find fast (∼1000 km s−1) outflows extending to kiloparsec scales, seen in ionized, neutral atomic and molecular gas. In this work we present radiative transfer calculations of emis... Read More about Unravelling the physics of multiphase AGN winds through emission line tracers.

Project ThaiPASS: international outreach blending astronomy and Python (2021)
Journal Article
Keegans, J. D., Stancliffe, R. J., Bilton, L. E., Cashmore, C. R., Gibson, B. K., Kristensen, M. T., …Chongchitnan, S. (2021). Project ThaiPASS: international outreach blending astronomy and Python. Physics Education, 56(3), Article 035001. https://doi.org/10.1088/1361-6552/abdae7

We present our outreach program, the Thailand–UK Python+Astronomy Summer School (ThaiPASS), a collaborative project comprising UK and Thai institutions and assess its impact and possible application to schools in the United Kingdom. Since its incepti... Read More about Project ThaiPASS: international outreach blending astronomy and Python.

Dispersion measure variability for 36 millisecond pulsars at 150 MHz with LOFAR (2020)
Journal Article
Donner, J. Y., Verbiest, J. P., Tiburzi, C., Osłowski, S., Künsemöller, J., Bak Nielsen, A. S., …Vocks, C. (2020). Dispersion measure variability for 36 millisecond pulsars at 150 MHz with LOFAR. Astronomy and Astrophysics, 644, Article A153. https://doi.org/10.1051/0004-6361/202039517

Context. Radio pulses from pulsars are affected by plasma dispersion, which results in a frequency-dependent propagation delay. Variations in the magnitude of this effect lead to an additional source of red noise in pulsar timing experiments, includi... Read More about Dispersion measure variability for 36 millisecond pulsars at 150 MHz with LOFAR.

PRIMAGE project: predictive in silico multiscale analytics to support childhood cancer personalised evaluation empowered by imaging biomarkers (2020)
Journal Article
Martí-Bonmatí, L., Alberich-Bayarri, Á., Ladenstein, R., Blanquer, I., Segrelles, J. D., Cerdá-Alberich, L., …Neri, E. (2020). PRIMAGE project: predictive in silico multiscale analytics to support childhood cancer personalised evaluation empowered by imaging biomarkers. European Radiology Experimental, 4(1), https://doi.org/10.1186/s41747-020-00150-9

PRIMAGE is one of the largest and more ambitious research projects dealing with medical imaging, artificial intelligence and cancer treatment in children. It is a 4-year European Commission-financed project that has 16 European partners in the consor... Read More about PRIMAGE project: predictive in silico multiscale analytics to support childhood cancer personalised evaluation empowered by imaging biomarkers.

The changing circumgalactic medium over the last 10 Gyr-I. Physical and dynamical properties (2020)
Journal Article
Huscher, E., Oppenheimer, B. D., Lonardi, A., Crain, R. A., Richings, A. J., & Schaye, J. (2021). The changing circumgalactic medium over the last 10 Gyr-I. Physical and dynamical properties. Monthly notices of the Royal Astronomical Society, 500(1), 1476-1490. https://doi.org/10.1093/mnras/staa3203

We present an analysis of the physical and dynamical states of two sets of EAGLE zoom simulations of galaxy haloes, one at high redshift (z = 2-3) and the other at low redshift (z = 0), with masses of ≈10^12 M. Our focus is how the circumgalactic med... Read More about The changing circumgalactic medium over the last 10 Gyr-I. Physical and dynamical properties.