All Outputs (21)

Practical approaches to analyzing PTA data: Cosmic strings with six pulsars (2023)
Journal Article
Quelquejay Leclere, H., Auclair, P., Babak, S., Chalumeau, A., Steer, D. A., Antoniadis, J., …Wu, Z. (2023). Practical approaches to analyzing PTA data: Cosmic strings with six pulsars. Physical Review D, 108(12), Article 123527. https://doi.org/10.1103/PhysRevD.108.123527

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 Pulsar Timing Array (EPTA). We perform a Bayesian analysis considering tw... Read More about Practical approaches to analyzing PTA data: Cosmic strings with six pulsars.

Search for gravitational wave signals from known pulsars in LIGO-Virgo O3 data using the 5n -vector ensemble method (2023)
Journal Article
D'Onofrio, L., De Rosa, R., Palomba, C., Leaci, P., Piccinni, O. J., Sequino, V., …Stappers, B. (2023). Search for gravitational wave signals from known pulsars in LIGO-Virgo O3 data using the 5n -vector ensemble method. Physical Review D, 108(12), Article 122002. https://doi.org/10.1103/PhysRevD.108.122002

The 5n-vector ensemble method is a multiple test for the targeted search of continuous gravitational waves from an ensemble of known pulsars. This method can improve the detection probability by combining the results from individually undetectable pu... Read More about Search for gravitational wave signals from known pulsars in LIGO-Virgo O3 data using the 5n -vector ensemble method.

Constraining the magnetic field geometry of the millisecond pulsar PSRJ0030+0451 from joint radio, thermal X-ray, and γ-ray emission (2023)
Journal Article
Pétri, J., Guillot, S., Guillemot, L., Cognard, I., Theureau, G., Grießmeier, J. M., …Zarka, P. (2023). Constraining the magnetic field geometry of the millisecond pulsar PSRJ0030+0451 from joint radio, thermal X-ray, and γ-ray emission. Astronomy and Astrophysics, 680, Article A93. https://doi.org/10.1051/0004-6361/202346913

Context. With the advent of multi-wavelength electromagnetic observations of neutron stars - spanning many decades in photon energies - from radio wavelengths up to X-rays and γ-rays, it has become possible to significantly constrain the geometry and... Read More about Constraining the magnetic field geometry of the millisecond pulsar PSRJ0030+0451 from joint radio, thermal X-ray, and γ-ray emission.

How to Detect an Astrophysical Nanohertz Gravitational Wave Background (2023)
Journal Article
Bécsy, B., Cornish, N. J., Meyers, P. M., Kelley, L. Z., Agazie, G., Anumarlapudi, A., …Young, O. (2023). How to Detect an Astrophysical Nanohertz Gravitational Wave Background. The Astrophysical journal, 959(1), Article 9. https://doi.org/10.3847/1538-4357/ad09e4

Analyses of pulsar timing data have provided evidence for a stochastic gravitational wave background in the nanohertz frequency band. The most plausible source of this background is the superposition of signals from millions of supermassive black hol... Read More about How to Detect an Astrophysical Nanohertz Gravitational Wave Background.

Pulsar scintillation through thick and thin: bow shocks, bubbles, and the broader interstellar medium (2023)
Journal Article
Ocker, S. K., Cordes, J. M., Chatterjee, S., Stinebring, D. R., Dolch, T., Giannakopoulos, C., …Reardon, D. J. (2024). Pulsar scintillation through thick and thin: bow shocks, bubbles, and the broader interstellar medium. Monthly notices of the Royal Astronomical Society, 527(3), 7568-7587. https://doi.org/10.1093/mnras/stad3683

Observations of pulsar scintillation are among the few astrophysical probes of very small-scale ( au) phenomena in the interstellar medium (ISM). In particular, characterization of scintillation arcs, including their curvature and intensity distribut... Read More about Pulsar scintillation through thick and thin: bow shocks, bubbles, and the broader interstellar medium.

The black widow pulsar J1641+8049 in the optical, radio, and X-rays (2023)
Journal Article
Kirichenko, A. Y., Zharikov, S. V., Karpova, A. V., Fonseca, E., Zyuzin, D. A., Shibanov, Y. A., …Swiggum, J. K. (2024). The black widow pulsar J1641+8049 in the optical, radio, and X-rays. Monthly notices of the Royal Astronomical Society, 527(3), 4563-4572. https://doi.org/10.1093/mnras/stad3391

PSR J1641+8049 is a 2 ms black widow pulsar with the 2.2 h orbital period detected in the radio and γ -rays. We performed new phase-resolved multiband photometry of PSR J1641+8049 using the OSIRIS instrument at the Gran Telescopio Canarias. The obtai... Read More about The black widow pulsar J1641+8049 in the optical, radio, and X-rays.

Second Data Release from the European Pulsar Timing Array: Challenging the Ultralight Dark Matter Paradigm (2023)
Journal Article
Smarra, C., Goncharov, B., Barausse, E., Antoniadis, J., Babak, S., Bak Nielsen, A., …European Pulsar Timing Array. (2023). Second Data Release from the European Pulsar Timing Array: Challenging the Ultralight Dark Matter Paradigm. Physical review letters, 131(17), Article 171001. https://doi.org/10.1103/PhysRevLett.131.171001

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 millisecond radio pulsars. With the second data release of the European Pulsa... Read More about Second Data Release from the European Pulsar Timing Array: Challenging the Ultralight Dark Matter Paradigm.

The second data release from the European Pulsar Timing Array: III. Search for gravitational wave signals (2023)
Journal Article
EPTA Collaboration and InPTA Collaboration:, Antoniadis, J., Arumugam, P., Arumugam, S., Babak, S., Bagchi, M., …Wu, Z. (2023). The second data release from the European Pulsar Timing Array: III. Search for gravitational wave signals. Astronomy and Astrophysics, 678, Article A50. https://doi.org/10.1051/0004-6361/202346844

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 Timing Array (EPTA) for 25 millisecond pulsars and a combination with t... Read More about The second data release from the European Pulsar Timing Array: III. Search for gravitational wave signals.

The NANOGrav 15 yr Data Set: Search for Anisotropy in the Gravitational-wave Background (2023)
Journal Article
Agazie, G., Anumarlapudi, A., Archibald, A. M., Arzoumanian, Z., Baker, P. T., Bécsy, B., …Young, O. (2023). The NANOGrav 15 yr Data Set: Search for Anisotropy in the Gravitational-wave Background. Astrophysical journal. Letters, 956(1), Article L3. https://doi.org/10.3847/2041-8213/acf4fd

The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) has reported evidence for the presence of an isotropic nanohertz gravitational-wave background (GWB) in its 15 yr data set. However, if the GWB is produced by a population of... Read More about The NANOGrav 15 yr Data Set: Search for Anisotropy in the Gravitational-wave Background.

The second data release from the European Pulsar Timing Array: II. Customised pulsar noise models for spatially correlated gravitational waves (2023)
Journal Article
EPTA Collaboration and InPTA Collaboration, Antoniadis, J., Arumugam, P., Arumugam, S., Babak, S., Bagchi, M., …Wu, Z. (2023). The second data release from the European Pulsar Timing Array: II. Customised pulsar noise models for spatially correlated gravitational waves. Astronomy and Astrophysics, 678, Article A49. https://doi.org/10.1051/0004-6361/202346842

Aims. 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 coalescing supermassive black hole binaries in the centres of merging g... Read More about The second data release from the European Pulsar Timing Array: II. Customised pulsar noise models for spatially correlated gravitational waves.

The second data release from the European Pulsar Timing Array: I. The dataset and timing analysis (2023)
Journal Article
Antoniadis, J., Babak, S., Bak Nielsen, A. S., Bassa, C. G., Berthereau, A., Bonetti, M., …Wu, Z. (2023). The second data release from the European Pulsar Timing Array: I. The dataset and timing analysis. Astronomy and Astrophysics, 678, Article A48. https://doi.org/10.1051/0004-6361/202346841

Pulsar timing arrays offer a probe of the low-frequency gravitational wave spectrum (1"100 nHz), which is intimately connected to a number of markers that can uniquely trace the formation and evolution of the Universe. We present the dataset and the... Read More about The second data release from the European Pulsar Timing Array: I. The dataset and timing analysis.

The NANOGrav 15 yr Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational-wave Background (2023)
Journal Article
Agazie, G., Anumarlapudi, A., Archibald, A. M., Baker, P. T., Bécsy, B., Blecha, L., …Sun, J. P. (2023). The NANOGrav 15 yr Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational-wave Background. Astrophysical journal. Letters, 952(2), Article L37. https://doi.org/10.3847/2041-8213/ace18b

The NANOGrav 15 yr data set shows evidence for the presence of a low-frequency gravitational-wave background (GWB). While many physical processes can source such low-frequency gravitational waves, here we analyze the signal as coming from a populatio... Read More about The NANOGrav 15 yr Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational-wave Background.

The NANOGrav 15 yr Data Set: Bayesian Limits on Gravitational Waves from Individual Supermassive Black Hole Binaries (2023)
Journal Article
Agazie, G., Anumarlapudi, A., Archibald, A. M., Arzoumanian, Z., Baker, P. T., Bécsy, B., …Young, O. (2023). The NANOGrav 15 yr Data Set: Bayesian Limits on Gravitational Waves from Individual Supermassive Black Hole Binaries. Astrophysical journal. Letters, 951(2), Article L50. https://doi.org/10.3847/2041-8213/ace18a

Evidence for a low-frequency stochastic gravitational-wave background has recently been reported based on analyses of pulsar timing array data. The most likely source of such a background is a population of supermassive black hole binaries, the loude... Read More about The NANOGrav 15 yr Data Set: Bayesian Limits on Gravitational Waves from Individual Supermassive Black Hole Binaries.

The NANOGrav 15 yr Data Set: Evidence for a Gravitational-wave Background (2023)
Journal Article
Agazie, G., Anumarlapudi, A., Archibald, A. M., Arzoumanian, Z., Baker, P. T., Bécsy, B., …Stovall, K. (2023). The NANOGrav 15 yr Data Set: Evidence for a Gravitational-wave Background. Astrophysical journal. Letters, 951(1), Article L8. https://doi.org/10.3847/2041-8213/acdac6

We report multiple lines of evidence for a stochastic signal that is correlated among 67 pulsars from the 15 yr pulsar timing data set collected by the North American Nanohertz Observatory for Gravitational Waves. The correlations follow the Hellings... Read More about The NANOGrav 15 yr Data Set: Evidence for a Gravitational-wave Background.

The NANOGrav 15 yr Data Set: Observations and Timing of 68 Millisecond Pulsars (2023)
Journal Article
Agazie, G., Faisal Alam, M. F., Anumarlapudi, A., Archibald, A. M., Arzoumanian, Z., Baker, P. T., …NANOGrav Collaboration. (2023). The NANOGrav 15 yr Data Set: Observations and Timing of 68 Millisecond Pulsars. Astrophysical journal. Letters, 951(1), Article L9. https://doi.org/10.3847/2041-8213/acda9a

We present observations and timing analyses of 68 millisecond pulsars (MSPs) comprising the 15 yr data set of the North American Nanohertz Observatory for Gravitational Waves (NANOGrav). NANOGrav is a pulsar timing array (PTA) experiment that is sens... Read More about The NANOGrav 15 yr Data Set: Observations and Timing of 68 Millisecond Pulsars.

The NANOGrav 15yr Data Set: Search for Signals from New Physics (2023)
Journal Article
Afzal, A., Agazie, G., Anumarlapudi, A., Archibald, A. M., Arzoumanian, Z., Baker, P. T., …Siemens, X. (2023). The NANOGrav 15yr Data Set: Search for Signals from New Physics. Astrophysical journal. Letters, 951(1), Article L11. https://doi.org/10.3847/2041-8213/acdc91

The 15 yr pulsar timing data set collected by the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) shows positive evidence for the presence of a low-frequency gravitational-wave (GW) background. In this paper, we investigate po... Read More about The NANOGrav 15yr Data Set: Search for Signals from New Physics.

The NANOGrav 15 yr Data Set: Detector Characterization and Noise Budget (2023)
Journal Article
Agazie, G., Anumarlapudi, A., Archibald, A. M., Arzoumanian, Z., Baker, P. T., Bécsy, B., …Young, O. (2023). The NANOGrav 15 yr Data Set: Detector Characterization and Noise Budget. Astrophysical journal. Letters, 951(1), Article L10. https://doi.org/10.3847/2041-8213/acda88

Pulsar timing arrays (PTAs) are galactic-scale gravitational wave (GW) detectors. Each individual arm, composed of a millisecond pulsar, a radio telescope, and a kiloparsecs-long path, differs in its properties but, in aggregate, can be used to extra... Read More about The NANOGrav 15 yr Data Set: Detector Characterization and Noise Budget.

Variable scintillation arcs of millisecond pulsars observed with the Large European Array for Pulsars (2023)
Journal Article
Main, R. A., Antoniadis, J., Chen, S., Cognard, I., Hu, H., Jang, J., …Zhu, W. W. (2023). Variable scintillation arcs of millisecond pulsars observed with the Large European Array for Pulsars. Monthly notices of the Royal Astronomical Society, 525(1), 1079-1096. https://doi.org/10.1093/mnras/stad1980

We present the first large sample of scintillation arcs in millisecond pulsars (MSPs), analysing 12 sources observed with the Large European Array for Pulsars (LEAP), and the Effelsberg 100-m telescope. We estimate the delays from multipath propagati... Read More about Variable scintillation arcs of millisecond pulsars observed with the Large European Array for Pulsars.

Searching for continuous Gravitational Waves in the second data release of the International Pulsar Timing Array (2023)
Journal Article
Falxa, M., Babak, S., Baker, P. T., Bécsy, B., Chalumeau, A., Chen, S., …Collaboration, I. (2023). Searching for continuous Gravitational Waves in the second data release of the International Pulsar Timing Array. Monthly notices of the Royal Astronomical Society, 521(4), 5077-5086. https://doi.org/10.1093/mnras/stad812

The International Pulsar Timing Array 2nd data release is the combination of data sets from worldwide collaborations. In this study, we search for continuous waves: gravitational wave signals produced by individual supermassive black hole binaries in... Read More about Searching for continuous Gravitational Waves in the second data release of the International Pulsar Timing Array.

Pulsar scintillation studies with LOFAR: II. Dual-frequency scattering study of PSR J0826+2637 with LOFAR and NenuFAR (2023)
Journal Article
Wu, Z., Coles, W. A., Verbiest, J. P., Ambalappat, K. M., Tiburzi, C., Grießmeier, J. M., …Corbel, S. (2023). Pulsar scintillation studies with LOFAR: II. Dual-frequency scattering study of PSR J0826+2637 with LOFAR and NenuFAR. Monthly notices of the Royal Astronomical Society, 520(4), 5536-5543. https://doi.org/10.1093/mnras/stad429

Interstellar scattering (ISS) of radio pulsar emission can be used as a probe of the ionized interstellar medium (IISM) and causes corruptions in pulsar timing experiments. Two types of ISS phenomena (intensity scintillation and pulse broadening) are... Read More about Pulsar scintillation studies with LOFAR: II. Dual-frequency scattering study of PSR J0826+2637 with LOFAR and NenuFAR.