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10 results on '"M., Burgay"'

1. Discoveries and timing of pulsars in NGC 6440

Author

L Vleeschower, B W Stappers, M Bailes, E D Barr, M Kramer, S Ransom, A Ridolfi, V Venkatraman Krishnan, A Possenti, M J Keith, M Burgay, P C C Freire, R Spiewak, D J Champion, M C Bezuidenhout, I C Niţu, W Chen, A Parthasarathy, M E DeCesar, S Buchner, I H Stairs, and J W T Hessels

Published
2022
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5. The Lowest-frequency Fast Radio Bursts: Sardinia Radio Telescope Detection of the Periodic FRB 180916 at 328 MHz

Author

M. Pilia, M. Burgay, A. Possenti, A. Ridolfi, V. Gajjar, A. Corongiu, D. Perrodin, G. Bernardi, G. Naldi, G. Pupillo, F. Ambrosino, G. Bianchi, A. Burtovoi, P. Casella, C. Casentini, M. Cecconi, C. Ferrigno, M. Fiori, K. C. Gendreau, A. Ghedina, G. Naletto, L. Nicastro, P. Ochner, E. Palazzi, F. Panessa, A. Papitto, C. Pittori, N. Rea, G. A. Rodriguez Castillo, V. Savchenko, G. Setti, M. Tavani, A. Trois, M. Trudu, M. Turatto, A. Ursi, F. Verrecchia, and L. Zampieri

Subjects
Astrophysics, Astronomy
Abstract

We report on the lowest-frequency detection to date of three bursts from the fast radio burst FRB 180916.J0158+65, observed at 328 MHz with the Sardinia Radio Telescope (SRT). The SRT observed the periodic repeater FRB 180916.J0158+65 for five days from 2020 February 20 to 24 during a time interval of active radio bursting, and detected the three bursts during the first hour of observations; no more bursts were detected during the remaining ∼30 hr. Simultaneous SRT observations at 1548 MHz did not detect any bursts. Burst fluences are in the range 37 to 13 Jy ms. No relevant scattering is observed for these bursts. We also present the results of the multiwavelength campaign we performed on FRB 180916.J0158+65, during the five days of the active window. Simultaneously with the SRT observations, others with different time spans were performed with the Northern Cross at 408 MHz, with XMM-Newton, NICER, INTEGRAL, AGILE, and with the TNG and two optical telescopes in Asiago, which are equipped with fast photometers. XMM-Newton obtained data simultaneously with the three bursts detected by the SRT, and determined a luminosity upper limit in the 0.3–10 keV energy range of ∼10(exp 45) erg/s for the burst emission. AGILE obtained data simultaneously with the first burst and determined a fluence upper limit in the MeV range for millisecond timescales of 10(exp -8) erg/sq.cm. Our results show that absorption from the circumburst medium does not significantly affect the emission from FRB 180916.J0158+65, thus limiting the possible presence of a superluminous supernova around the source, and indicate that a cutoff for the bursting mechanism, if present, must be at lower frequencies. Our multi-wavelength campaign sensitively constrains the broadband emission from FRB 180916.J0158+65, and provides the best limits so far for the electromagnetic response to the radio bursting of this remarkable source of fast radio bursts.

Published
2020
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6. Tests of gravitational symmetries with pulsar binary J1713+0747

Author

W W Zhu, G Desvignes, N Wex, R N Caballero, D J Champion, P B Demorest, J A Ellis, G H Janssen, M Kramer, A Krieger, L Lentati, D J Nice, S M Ransom, I H Stairs, B W Stappers, J P W Verbiest, Z Arzoumanian, C G Bassa, M Burgay, I Cognard, K Crowter, T Dolch, R D Ferdman, E Fonseca, M E Gonzalez, E Graikou, L Guillemot, J W T Hessels, A Jessner, G Jones, M L Jones, C Jordan, R Karuppusamy, M T Lam, K Lazaridis, P Lazarus, K J Lee, L Levin, K Liu, A G Lyne, J W McKee, M A McLaughlin, S Osłowski, T Pennucci, D Perrodin, A Possenti, S Sanidas, G Shaifullah, R Smits, K Stovall, J Swiggum, G Theureau, and C Tiburzi

Published
2018
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7. Studying the Solar system with the International Pulsar Timing Array

Author

R N Caballero, Y J Guo, K J Lee, P Lazarus, D J Champion, G Desvignes, M Kramer, K Plant, Z Arzoumanian, M Bailes, C G Bassa, N D R Bhat, A Brazier, M Burgay, S Burke-Spolaor, S J Chamberlin, S Chatterjee, I Cognard, J M Cordes, S Dai, P Demorest, T Dolch, R D Ferdman, E Fonseca, J R Gair, N Garver-Daniels, P Gentile, M E Gonzalez, E Graikou, L Guillemot, G Hobbs, G H Janssen, R Karuppusamy, M J Keith, M Kerr, M T Lam, P D Lasky, T J W Lazio, L Levin, K Liu, A N Lommen, D R Lorimer, R S Lynch, D R Madison, R N Manchester, J W McKee, M A McLaughlin, S T McWilliams, C M F Mingarelli, D J Nice, S Osłowski, N T Palliyaguru, T T Pennucci, B B P Perera, D Perrodin, A Possenti, S M Ransom, D J Reardon, S A Sanidas, A Sesana, G Shaifullah, R M Shannon, X Siemens, J Simon, R Spiewak, I Stairs, B Stappers, D R Stinebring, K Stovall, J K Swiggum, S R Taylor, G Theureau, C Tiburzi, L Toomey, R van Haasteren, W van Straten, J P W Verbiest, J B Wang, X J Zhu, and W W Zhu

Published
2018
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8. The International Pulsar Timing Array: Second Data Release

Author

B B P Perara, M E DeCesar, P B Demorest, M Kerr, L Lentati, D J Nice, S Oslowski, S M Ransom, M J Keith, Z Arzoumanian, M Bailes, P T Baker, C G Bassa, NDR Bhat, A Brazier, M Burgay, S Burke-Spolaor, R N Caballero, D J Champion, S Chatterjee, S Chen, I Cognard, J M Cordes, K Crowter, S Dai, G Desvignes, T Dolch, R D Ferdman, E C Ferrara, E Fonseca, J M Goldstein, E Graikou, L Guillemot, J S Hazboun, G Hobbs, H Hu, K Islo, G H Janssen, R Karuppusam, M Kramer, M T Lam, K J Lee, K Liu, J Luo, A G Lyne, R N Manchester, J W McKee, M A McLaughlin, C M F Mingarelli, A P Parthasarathy, T T Pennucci, D Perrodin, A Possenti, D J Reardon, C J Russell, S A Sanidas, A Sesana, G Shaifullah, R M Shannon, X Siemens, J Simon, R Spiewak, I H Stairs, B W Stappers, J K Swiggum, S R Taylor, G Theureau, C Tiburzi, M Vallisneri, A Vecchio, J B Wang, S B Zhang, L Zhang, W W Zhu, and X J Zhu

Subjects
Astronomy
Abstract

In this paper, we describe the International Pulsar Timing Array second data release, which includes recent pulsar timing data obtained by three regional consortia: the European Pulsar Timing Array, the North American Nanohertz Observatory for Gravitational Waves, and the Parkes Pulsar Timing Array. We analyse and where possible combine high-precision timing data for 65 millisecond pulsars which are regularly observed by these groups. A basic noise analysis, including the processes which are both correlated and uncorrelated in time, provides noise models and timing ephemerides for the pulsars. We find that the timing precisions of pulsars are generally improved compared to the previous data release, mainly due to the addition of new data in the combination. The main purpose of this work is to create the most up-to-date IPTA data release. These data are publicly available for searches for low-frequency gravitational waves and other pulsar science.

Published
2019
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9. Tests of Gravitational Symmetries with Pulsar Binary J1713+0747

Author

W W Zhu, G Desvignes, N Wex, R N Caballero, D J Champion, P B Demorest, J A Ellis, G H Janssen, M Kramer, A Krieger, L Lentati, D J Nice, S M Ransom, I H Stairs, B W Stappers, J P W Verbiest, Z Arzoumanian, C G Bassa, M Burgay, I Cognard, K Crowter, T Dolch, R D Ferdman, E Fonseca, M E Gonzalez, E Graikou, L Guillemot, J W T Hessels, A Jessner, G Jones, M L Jones, C Jordan, R Karuppusamy, M T Lam, K Lazaridis, P Lazarus, K J Lee, L Levin, K Liu, A G Lyne, J W McKee, M A McLaughlin, S Oslowski, T Pennucci, D Perrodin, A Possenti, S Sanidas, G Shaifullah, R Smits, K Stovall, J Swiggum, G Theureau, and C Tiburzi

Subjects
Astronomy
Abstract

Symmetries play a fundamental role in modern theories of gravity. The strong equivalence principle (SEP) constitutes a collection of gravitational symmetries which are all implemented by general relativity. Alternative theories, however, are generally expected to violate some aspects of SEP. We test three aspects of SEP using observed change rates in the orbital period and eccentricity of binary pulsar J1713+0747: (1) the gravitational constant’s constancy as part of locational invariance of gravitation; (2) the universality of free fall (UFF) for strongly self-gravitating bodies; (3) the post-Newtonian parameter ˆα3 in gravitational Lorentz invariance. Based on the pulsar timing result of the combined data set from the North American Nanohertz Gravitational Observatory and the European Pulsar Timing Array, we find G˙ /G = (−0.1 ± 0.9) × 10−12 yr−1, which is weaker than Solar system limits, but applies for strongly self-gravitating objects. Furthermore, we obtain an improved test for a UFF violation by a strongly self-gravitating mass falling in the gravitational field of our Galaxy, with a limit of |Delta| < 0.002 (95 per cent C.L.). Finally, we derive an improved limit on the self-acceleration of a gravitationally bound rotating body, to a preferred reference frame in the Universe, with −3 × 10−20 < ˆα3 < 4 × 10−20 (95 per cent C.L.). These results are based on direct UFF and ˆα3 tests using pulsar binaries, and they overcome various limitations of previous tests of this kind.

Published
2018
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10. Limits on Anisotropy in the Nanohertz Stochastic Gravitational Wave Background

Author

S. R. Taylor, C. M. F. Mingarelli, J. R. Gair, A. Sesana, G. Theureau, S. Babak, C. G. Bassa, P. Brem, M. Burgay, R. N. Caballero, D. J. Champion, I. Cognard, G. Desvignes, L. Guillemot, J. W. T. Hessels, G. H. Janssen, R. Karuppusamy, M. Kramer, A. Lassus, P. Lazarus, L. Lentati, K. Liu, S. Osłowski, D. Perrodin, A. Petiteau, A. Possenti, M. B. Purver, P. A. Rosado, S. A. Sanidas, R. Smits, B. Stappers, C. Tiburzi, R. van Haasteren, A. Vecchio, and J. P. W. Verbiest

Published
2015
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