Zobrazeno 1 - 10
of 84
pro vyhledávání: '"P. C. C. Freire"'
Autor:
A. Corongiu, A. Ridolfi, F. Abbate, M. Bailes, A. Possenti, M. Geyer, R. N. Manchester, M. Kramer, P. C. C. Freire, M. Burgay, S. Buchner, F. Camilo
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 2, p 198 (2024)
Millisecond pulsars are subject to accelerations in globular clusters (GCs) that manifest themselves in both the first and second spin period time derivatives, and can be used to explore the mass distribution of the potentials they inhabit. Here we r
Externí odkaz:
https://doaj.org/article/11143f3f6d3f42f3b55e541bdb5167fa
Autor:
X. Hou, W. Zhang, P. C. C. Freire, D. F. Torres, J. Ballet, D. A. Smith, T. J. Johnson, M. Kerr, C. C. Cheung, L. Guillemot, J. Li, L. Zhang, A. Ridolfi, P. Wang, D. Li, J. Yuan, N. Wang
Publikováno v:
The Astrophysical Journal, Vol 964, Iss 2, p 118 (2024)
We analyzed the globular cluster M5 (NGC 5904) using 15 yr of gamma-ray data from the Fermi Large Area Telescope (LAT). Using rotation ephemerides generated from Arecibo and FAST radio telescope observations, we searched for gamma-ray pulsations from
Externí odkaz:
https://doaj.org/article/3844df6bdddc460b8a68b59f2565fbd3
Autor:
J. S. Deneva, M. McLaughlin, T. E. E. Olszanski, E. F. Lewis, D. Pang, P. C. C. Freire, M. Bagchi, K. Stovall
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 271, Iss 1, p 23 (2024)
The AO327 drift survey for radio pulsars and transients used the Arecibo telescope from 2010 until its collapse in 2020. AO327 collected ∼3100 hr of data at 327 MHz with a time resolution of 82 μ s and a frequency resolution of 24 kHz. While the m
Externí odkaz:
https://doaj.org/article/7a59c60c110c4ecfb53b4242ef24aaf4
Publikováno v:
The Astrophysical Journal Letters, Vol 951, Iss 2, p L37 (2023)
The most distant globular cluster (GC) with known pulsars is NGC 5024 (M53). In this paper, we report the discovery of a new binary millisecond pulsar, PSR J1312+1810E (M53E), and present the new timing solutions for M53B–E based on 22 observations
Externí odkaz:
https://doaj.org/article/3f8bdf8fcb1d4e16ba366b185ffd2a3f
Autor:
D. A. Smith, S. Abdollahi, M. Ajello, M. Bailes, L. Baldini, J. Ballet, M. G. Baring, C. Bassa, J. Becerra Gonzalez, R. Bellazzini, A. Berretta, B. Bhattacharyya, E. Bissaldi, R. Bonino, E. Bottacini, J. Bregeon, P. Bruel, M. Burgay, T. H. Burnett, R. A. Cameron, F. Camilo, R. Caputo, P. A. Caraveo, E. Cavazzuti, G. Chiaro, S. Ciprini, C. J. Clark, I. Cognard, A. Corongiu, P. Cristarella Orestano, M. Crnogorcevic, A. Cuoco, S. Cutini, F. D’Ammando, A. de Angelis, M. E. DeCesar, S. De Gaetano, R. de Menezes, J. Deneva, F. de Palma, N. Di Lalla, F. Dirirsa, L. Di Venere, A. Domínguez, D. Dumora, S. J. Fegan, E. C. Ferrara, A. Fiori, H. Fleischhack, C. Flynn, A. Franckowiak, P. C. C. Freire, Y. Fukazawa, P. Fusco, G. Galanti, V. Gammaldi, F. Gargano, D. Gasparrini, F. Giacchino, N. Giglietto, F. Giordano, M. Giroletti, D. Green, I. A. Grenier, L. Guillemot, S. Guiriec, M. Gustafsson, A. K. Harding, E. Hays, J. W. Hewitt, D. Horan, X. Hou, F. Jankowski, R. P. Johnson, T. J. Johnson, S. Johnston, J. Kataoka, M. J. Keith, M. Kerr, M. Kramer, M. Kuss, L. Latronico, S.-H. Lee, D. Li, J. Li, B. Limyansky, F. Longo, F. Loparco, L. Lorusso, M. N. Lovellette, M. Lower, P. Lubrano, A. G. Lyne, Y. Maan, S. Maldera, R. N. Manchester, A. Manfreda, M. Marelli, G. Martí-Devesa, M. N. Mazziotta, J. E. McEnery, I. Mereu, P. F. Michelson, M. Mickaliger, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, M. E. Monzani, A. Morselli, M. Negro, R. Nemmen, L. Nieder, E. Nuss, N. Omodei, M. Orienti, E. Orlando, J. F. Ormes, M. Palatiello, D. Paneque, G. Panzarini, A. Parthasarathy, M. Persic, M. Pesce-Rollins, R. Pillera, H. Poon, T. A. Porter, A. Possenti, G. Principe, S. Rainò, R. Rando, S. M. Ransom, P. S. Ray, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, N. Renault-Tinacci, R. W. Romani, M. Sánchez-Conde, P. M. Saz Parkinson, L. Scotton, D. Serini, C. Sgrò, R. Shannon, V. Sharma, Z. Shen, E. J. Siskind, G. Spandre, P. Spinelli, B. W. Stappers, T. E. Stephens, D. J. Suson, S. Tabassum, H. Tajima, D. Tak, G. Theureau, D. J. Thompson, O. Tibolla, D. F. Torres, J. Valverde, C. Venter, Z. Wadiasingh, N. Wang, P. Wang, P. Weltevrede, K. Wood, J. Yan, G. Zaharijas, C. Zhang, W. Zhu
Publikováno v:
The Astrophysical Journal, Vol 958, Iss 2, p 191 (2023)
We present 294 pulsars found in GeV data from the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope. Another 33 millisecond pulsars (MSPs) discovered in deep radio searches of LAT sources will likely reveal pulsations once phase-conne
Externí odkaz:
https://doaj.org/article/0817b2a03e22460ea0e879944995ae58
Autor:
M. Kramer, I. H. Stairs, R. N. Manchester, N. Wex, A. T. Deller, W. A. Coles, M. Ali, M. Burgay, F. Camilo, I. Cognard, T. Damour, G. Desvignes, R. D. Ferdman, P. C. C. Freire, S. Grondin, L. Guillemot, G. B. Hobbs, G. Janssen, R. Karuppusamy, D. R. Lorimer, A. G. Lyne, J. W. McKee, M. McLaughlin, L. E. Münch, B. B. P. Perera, N. Pol, A. Possenti, J. Sarkissian, B. W. Stappers, G. Theureau
Publikováno v:
Physical Review X, Vol 11, Iss 4, p 041050 (2021)
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 i
Externí odkaz:
https://doaj.org/article/5c935e0afc3243b2b078b84b116ee712
Autor:
M Shamohammadi, M Bailes, P C C Freire, A Parthasarathy, D J Reardon, R M Shannon, V Venkatraman Krishnan, M C i Bernadich, A D Cameron, D J Champion, A Corongiu, C Flynn, M Geyer, M Kramer, M T Miles, A Possenti, R Spiewak
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 520:1789-1806
Precision timing of millisecond pulsars in binary systems enables observers to detect the relativistic Shapiro delay induced by space time curvature. When favourably aligned, this enables constraints to be placed on the component masses and system or
Autor:
H Ding, A T Deller, B W Stappers, T J W Lazio, D Kaplan, S Chatterjee, W Brisken, J Cordes, P C C Freire, E Fonseca, I Stairs, L Guillemot, A Lyne, I Cognard, D J Reardon, G Theureau
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 519:4982-5007
With unparalleled rotational stability, millisecond pulsars (MSPs) serve as ideal laboratories for numerous astrophysical studies, many of which require precise knowledge of the distance and/or velocity of the MSP. Here, we present the astrometric re
Autor:
F Abbate, A Possenti, A Ridolfi, V Venkatraman Krishnan, S Buchner, E D Barr, M Bailes, M Kramer, A Cameron, A Parthasarathy, W van Straten, W Chen, F Camilo, P V Padmanabh, S A Mao, P C C Freire, S M Ransom, L Vleeschower, M Geyer, L Zhang
Publikováno v:
Monthly Notices of the Royal Astronomical Society
We present the polarization profiles of 22 pulsars in the globular cluster 47 Tucanae using observations from the MeerKAT radio telescope at UHF-band (544-1088 MHz) and report precise values of dispersion measure (DM) and rotation measure (RM). We us
Autor:
C C Miao, W W Zhu, D Li, P C C Freire, J R Niu, P Wang, J P Yuan, M Y Xue, A D Cameron, D J Champion, M Cruces, Y T Chen, M M Chi, X F Cheng, S J Dang, M F Ding, Y Feng, Z Y Gan, G Hobbs, M Kramer, Z J Liu, Y X Li, Z K Luo, X L Miao, L Q Meng, C H Niu, Z C Pan, L Qian, Z Y Sun, N Wang, S Q Wang, J B Wang, Q D Wu, Y B Wang, C J Wang, H F Wang, S Wang, X Y Xie, M Xie, Y F Xiao, M Yuan, Y L Yue, J M Yao, W M Yan, S P You, X H Yu, D Zhao, R S Zhao, L Zhang
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 518:1672-1682
We report the phase-connected timing ephemeris, polarization pulse profiles, Faraday rotation measurements, and Rotating-Vector-Model (RVM) fitting results of 12 millisecond pulsars (MSPs) discovered with the Five-hundred-meter Aperture Spherical rad