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  1. Book ; Online: Optimal periodicity searching

    Morello, V. / Barr, E. D. / Stappers, B. W. / Keane, E. F. / Lyne, A. G.

    Revisiting the Fast Folding Algorithm for large-scale pulsar surveys

    2020  

    Abstract: The Fast Folding Algorithm (FFA) is a phase-coherent search technique for periodic signals. It has rarely been used in radio pulsar searches, having been historically supplanted by the less computationally expensive Fast Fourier Transform (FFT) with ... ...

    Abstract The Fast Folding Algorithm (FFA) is a phase-coherent search technique for periodic signals. It has rarely been used in radio pulsar searches, having been historically supplanted by the less computationally expensive Fast Fourier Transform (FFT) with incoherent harmonic summing (IHS). Here we derive from first principles that an FFA search closely approaches the theoretical optimum sensitivity to all periodic signals; it is analytically shown to be significantly more sensitive than the standard FFT+IHS method, regardless of pulse period and duty cycle. A portion of the pulsar phase space has thus been systematically under-explored for decades; pulsar surveys aiming to fully sample the pulsar population should include an FFA search as part of their data analysis. We have developed an FFA software package, riptide, fast enough to process radio observations on a large scale; riptide has already discovered sources undetectable using existing FFT+IHS implementations. Our sensitivity comparison between search techniques also shows that a more realistic radiometer equation is needed, which includes an additional term: the search efficiency. We derive the theoretical efficiencies of both the FFA and the FFT+IHS methods and discuss how excluding this term has consequences for pulsar population synthesis studies.

    Comment: Submitted to MNRAS, 19 pages, 9 figures
    Keywords Astrophysics - Instrumentation and Methods for Astrophysics
    Subject code 612
    Publishing date 2020-04-07
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Book ; Conference proceedings: Biology of the skin and hair growth

    Lyne, A. G. / Short, Bryan F.

    proc. of a symposium held at Canberra, Australia, August 1964

    1965  

    Author's details ed. by A. G. Lyne and B[ryan] F[rancis] Short
    Language English
    Size XI, 806 S. ; 8-o
    Publisher Angus & Robertson
    Publishing place Sydney
    Publishing country Australia
    Document type Book ; Conference proceedings
    HBZ-ID HT007988943
    Database Catalogue ZB MED Medicine, Health

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    Shelf markLoan statusLocation
    1973 A 596 order for loan Magazin

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  3. Article ; Online: Neutron star mass estimates from gamma-ray eclipses in spider millisecond pulsar binaries.

    Clark, C J / Kerr, M / Barr, E D / Bhattacharyya, B / Breton, R P / Bruel, P / Camilo, F / Chen, W / Cognard, I / Cromartie, H T / Deneva, J / Dhillon, V S / Guillemot, L / Kennedy, M R / Kramer, M / Lyne, A G / Sánchez, D Mata / Nieder, L / Phillips, C /
    Ransom, S M / Ray, P S / Roberts, M S E / Roy, J / Smith, D A / Spiewak, R / Stappers, B W / Tabassum, S / Theureau, G / Voisin, G

    Nature astronomy

    2023  Volume 7, Issue 4, Page(s) 451–462

    Abstract: Reliable neutron star mass measurements are key to determining the equation of state of cold nuclear matter, but such measurements are rare. Black widows and redbacks are compact binaries consisting of millisecond pulsars and semi-degenerate companion ... ...

    Abstract Reliable neutron star mass measurements are key to determining the equation of state of cold nuclear matter, but such measurements are rare. Black widows and redbacks are compact binaries consisting of millisecond pulsars and semi-degenerate companion stars. Spectroscopy of the optically bright companions can determine their radial velocities, providing inclination-dependent pulsar mass estimates. Although inclinations can be inferred from subtle features in optical light curves, such estimates may be systematically biased due to incomplete heating models and poorly understood variability. Using data from the Fermi Large Area Telescope, we have searched for gamma-ray eclipses from 49 spider systems, discovering significant eclipses in 7 systems, including the prototypical black widow PSR B1957+20. Gamma-ray eclipses require direct occultation of the pulsar by the companion, and so the detection, or significant exclusion, of a gamma-ray eclipse strictly limits the binary inclination angle, providing new robust, model-independent pulsar mass constraints. For PSR B1957+20, the eclipse implies a much lighter pulsar (1.81 ± 0.07 solar masses) than inferred from optical light curve modelling.
    Language English
    Publishing date 2023-01-26
    Publishing country England
    Document type Journal Article
    ISSN 2397-3366
    ISSN (online) 2397-3366
    DOI 10.1038/s41550-022-01874-x
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  4. Article ; Online: Second Data Release from the European Pulsar Timing Array: Challenging the Ultralight Dark Matter Paradigm.

    Smarra, Clemente / Goncharov, Boris / Barausse, Enrico / Antoniadis, J / Babak, S / Nielsen, A-S Bak / Bassa, C G / Berthereau, A / Bonetti, M / Bortolas, E / Brook, P R / Burgay, M / Caballero, R N / Chalumeau, A / Champion, D J / Chanlaridis, S / Chen, S / Cognard, I / Desvignes, G /
    Falxa, M / Ferdman, R D / Franchini, A / Gair, J R / Graikou, E / Grießmeier, J-M / Guillemot, L / Guo, Y J / Hu, H / Iraci, F / Izquierdo-Villalba, D / Jang, J / Jawor, J / Janssen, G H / Jessner, A / Karuppusamy, R / Keane, E F / Keith, M J / Kramer, M / Krishnakumar, M A / Lackeos, K / Lee, K J / Liu, K / Liu, Y / Lyne, A G / McKee, J W / Main, R A / Mickaliger, M B / Niţu, I C / Parthasarathy, A / Perera, B B P / Perrodin, D / Petiteau, A / Porayko, N K / Possenti, A / Leclere, H Quelquejay / Samajdar, A / Sanidas, S A / Sesana, A / Shaifullah, G / Speri, L / Spiewak, R / Stappers, B W / Susarla, S C / Theureau, G / Tiburzi, C / van der Wateren, E / Vecchio, A / Krishnan, V Venkatraman / Wang, J / Wang, L / Wu, Z

    Physical review letters

    2023  Volume 131, Issue 17, Page(s) 171001

    Abstract: 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 Pulsar ... ...

    Abstract 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 Pulsar Timing Array, we focus on the most robust scenario, in which dark matter interacts only gravitationally with ordinary baryonic matter. Our results show that ultralight particles with masses 10^{-24.0}  eV≲m≲10^{-23.3}  eV cannot constitute 100% of the measured local dark matter density, but can have at most local density ρ≲0.3  GeV/cm^{3}.
    Language English
    Publishing date 2023-11-13
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.131.171001
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  5. Article ; Online: A periodically active pulsar giving insight into magnetospheric physics.

    Kramer, M / Lyne, A G / O'Brien, J T / Jordan, C A / Lorimer, D R

    Science (New York, N.Y.)

    2006  Volume 312, Issue 5773, Page(s) 549–551

    Abstract: PSR B1931+24 (J1933+2421) behaves as an ordinary isolated radio pulsar during active phases that are 5 to 10 days long. However, when the radio emission ceases, it switches off in less than 10 seconds and remains undetectable for the next 25 to 35 days, ... ...

    Abstract PSR B1931+24 (J1933+2421) behaves as an ordinary isolated radio pulsar during active phases that are 5 to 10 days long. However, when the radio emission ceases, it switches off in less than 10 seconds and remains undetectable for the next 25 to 35 days, then switches on again. This pattern repeats quasi-periodically. The origin of this behavior is unclear. Even more remarkably, the pulsar rotation slows down 50% faster when it is on than when it is off. This indicates a massive increase in magnetospheric currents when the pulsar switches on, proving that pulsar wind plays a substantial role in pulsar spin-down. This allows us, for the first time, to estimate the magnetospheric currents in a pulsar magnetosphere during the occurrence of radio emission.
    Language English
    Publishing date 2006-04-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.1124060
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: A Periodically Active Pulsar Giving Insight into Magnetospheric Physics

    Kramer, M / Jordan, C. A / Lorimer, D. R / Lyne, A. G / O'Brien, J. T

    Science. 2006 Apr. 28, v. 312, no. 5773

    2006  

    Abstract: PSR B1931+24 (J1933+2421) behaves as an ordinary isolated radio pulsar during active phases that are 5 to 10 days long. However, when the radio emission ceases, it switches off in less than 10 seconds and remains undetectable for the next 25 to 35 days, ... ...

    Abstract PSR B1931+24 (J1933+2421) behaves as an ordinary isolated radio pulsar during active phases that are 5 to 10 days long. However, when the radio emission ceases, it switches off in less than 10 seconds and remains undetectable for the next 25 to 35 days, then switches on again. This pattern repeats quasi-periodically. The origin of this behavior is unclear. Even more remarkably, the pulsar rotation slows down 50% faster when it is on than when it is off. This indicates a massive increase in magnetospheric currents when the pulsar switches on, proving that pulsar wind plays a substantial role in pulsar spin-down. This allows us, for the first time, to estimate the magnetospheric currents in a pulsar magnetosphere during the occurrence of radio emission.
    Keywords geophysics ; magnetism ; radio ; wind
    Language English
    Dates of publication 2006-0428
    Size p. 549-551.
    Publishing place American Association for the Advancement of Science
    Document type Article
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.1124060
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: The development of hair follicles in the marsupial Trichosurus vulpecula.

    Lyne, A G

    Australian journal of biological sciences

    1970  Volume 23, Issue 6, Page(s) 1241–1253

    MeSH term(s) Age Factors ; Animals ; Hair/anatomy & histology ; Hair/cytology ; Hair/growth & development ; Hair/innervation ; Opossums/growth & development ; Skin/anatomy & histology ; Skin/cytology ; Skin/innervation
    Language English
    Publishing date 1970-12
    Publishing country Australia
    Document type Journal Article
    ZDB-ID 2966-x
    ISSN 0004-9417
    ISSN 0004-9417
    DOI 10.1071/bi9701241
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    Zs.A 2803: Show issues Location:
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  8. Article: Observations on Graafian follicles and their oocytes during lactation and after the removal of pouch young in the marsupials Isoodon macrourus and Perameles nasuta.

    Lyne, A G / Hollis, D E

    The American journal of anatomy

    1983  Volume 166, Issue 1, Page(s) 41–61

    Abstract: Ovaries from 63 bandicoots (Isoodon macrourus and Perameles nasuta) were collected in order to obtain Graafian follicles close to ovulation for light and electron microscopy. During the first 42 days of lactation (lactation c. 60 days), the follicles ... ...

    Abstract Ovaries from 63 bandicoots (Isoodon macrourus and Perameles nasuta) were collected in order to obtain Graafian follicles close to ovulation for light and electron microscopy. During the first 42 days of lactation (lactation c. 60 days), the follicles were less than 1.0 mm in diameter, whereas from 43 to 52 days, some animals had follicles up to 2.0 mm in diameter, or ovulation had occurred and new corpora lutea were present. This ovulation was associated with the lactation estrus that occurred in some animals. In general, the largest Graafian follicles of the bandicoots were morphologically similar and resembled those of many other mammals. These follicles protruded from the surface of the ovary and revealed a conspicuous theca interna. The granulosa cells exhibited an unusual feature in that they contained masses of glycogen, often associated with lipid droplets and filaments. The oocytes were similar in size (diameter c. 150 microns) to those of some other marsupials and were surrounded by a zona pellucida and cumulus cells attached to the granulosa layer. The cumulus cells did not form a corona radiata as in eutherian mammals. The oocyte nuclei were somewhat flattened, peripherally located and similar in size (c. 40 x 19 microns) to those in other marsupials. These nuclei, which stained lightly with Azure A and were electron-lucent and homogeneous, were unusually irregular in contour. The nuclei were unique in that nucleoli were always absent. Small cytoplasmic bodies which may have been extruded nucleoli were found in the oocytes of I. macrourus, but not in P. nasuta. The cytoplasm in the bandicoot oocytes resembled that of other marsupials and some eutherians in that it was highly vacuolated with most of the organelles concentrated peripherally. Within the central region of the bandicoot oocytes there were crystalloids which were similar to those in oocytes of primordial follicles and in unilaminar blastocysts of I. macrourus.
    MeSH term(s) Animals ; Breeding ; Female ; Lactation ; Marsupialia/anatomy & histology ; Oocytes/anatomy & histology ; Oocytes/ultrastructure ; Ovarian Follicle/anatomy & histology ; Ovarian Follicle/ultrastructure ; Ovum/anatomy & histology ; Pregnancy
    Language English
    Publishing date 1983-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2933-6
    ISSN 0002-9106
    ISSN 0002-9106
    DOI 10.1002/aja.1001660104
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  9. Book: Pulsar astronomy

    Lyne, A. G / Graham-Smith, Francis

    (Cambridge astrophysics series ; 16)

    1990  

    Author's details A. G. Lyne; Francis Graham-Smith
    Series title Cambridge astrophysics series ; 16
    Keywords Double stars ; Pulsars ; Pulsar
    Language English
    Size XIV, 274 S., graph. Darst.
    Publisher Cambridge Univ. Press
    Publishing place Cambridge u.a.
    Document type Book
    Note Bibliography: p. [260]-271
    ISBN 0521326818 ; 9780521326810
    Database Former special subject collection: coastal and deep sea fishing

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  10. Book: Pulsar astronomy

    Lyne, A. G / Graham-Smith, Francis

    (Cambridge astrophysics series ; 16)

    1990  

    Author's details A. G. Lyne; Francis Graham-Smith
    Series title Cambridge astrophysics series ; 16
    Keywords Double stars ; Pulsars ; Pulsar
    Language English
    Size XIV, 274 S., graph. Darst.
    Publisher Cambridge Univ. Press
    Publishing place Cambridge u.a.
    Document type Book
    Note Bibliography: p. [260]-271
    ISBN 0521326818 ; 9780521326810
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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