Zobrazeno 1 - 10 of 23 pro vyhledávání: '"David R A Williams"'
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Akademický článek
Evidence for a Black Hole Spin–Orbit Misalignment in the X-Ray Binary Cyg X-1
Autor: Andrzej A. Zdziarski, Alexandra Veledina, Michał Szanecki, David A. Green, Joe S. Bright, David R. A. Williams
Publikováno v: The Astrophysical Journal Letters, Vol 951, Iss 2, p L45 (2023)
Recently, the accretion geometry of the black hole X-ray binary Cyg X-1 was probed with the X-ray polarization. The position angle of the X-ray-emitting flow was found to be aligned with the position angle of the radio jet in the plane of the sky. At
Externí odkaz: https://doaj.org/article/e7d8b8895eaf49a0b3ec5b240ad8d4b0
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2
Akademický článek
AT 2021loi: A Bowen Fluorescence Flare with a Rebrightening Episode Occurring in a Previously Known AGN
Autor: Lydia Makrygianni, Benny Trakhtenbrot, Iair Arcavi, Claudio Ricci, Marco C. Lam, Assaf Horesh, Itai Sfaradi, K. Azalee Bostroem, Griffin Hosseinzadeh, D. Andrew Howell, Craig Pellegrino, Rob Fender, David A. Green, David R. A. Williams, Joe Bright
Publikováno v: The Astrophysical Journal, Vol 953, Iss 1, p 32 (2023)
The optical-ultraviolet transient AT 2021loi is located at the center of its host galaxy. Its spectral features identify it as a member of the Bowen fluorescence flare (BFF) class. The first member of this class was considered to be related to a tida
Externí odkaz: https://doaj.org/article/c88caa09ec1f48179f8101bdffc3ff44
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3
Low-frequency radio observations of recurrent nova RS Ophiuchi with MeerKAT and LOFAR
Autor: Iris de Ruiter, Miriam M Nyamai, Antonia Rowlinson, Ralph A M J Wijers, Tim J O’Brien, David R A Williams, Patrick Woudt
We report low-frequency radio observations of the 2021 outburst of the recurrent nova RS Ophiuchi. These observations include the lowest frequency observations of this system to date. Detailed light curves are obtained by MeerKAT at 0.82 and 1.28 GHz
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e76d4a0818d3ddb7bc7889b08f32cef7
http://arxiv.org/abs/2301.10552
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4
Serendipitous discovery of radio flaring behaviour from a nearby M dwarf with MeerKAT
Autor: Alex Andersson, Rob P Fender, Chris J Lintott, David R A Williams, Laura N Driessen, Patrick A Woudt, Alexander J van der Horst, David A H Buckley, Sara E Motta, Lauren Rhodes, Nora L Eisner, Rachel A Osten, Paul Vreeswijk, Steven Bloemen, Paul J Groot
Publikováno v: Monthly Notices of the Royal Astronomical Society, 513, 3482-3492
Monthly Notices of the Royal Astronomical Society, 513, 3, pp. 3482-3492
Andersson, A, Fender, R P, Lintott, C J, Williams, D R A, Driessen, L N, Woudt, P A, van der Horst, A J, Buckley, D A H, Motta, S E, Rhodes, L, Eisner, N L, Osten, R A, Vreeswijk, P, Bloemen, S & Groot, P J 2022, ' Serendipitous discovery of radio flaring behaviour from a nearby M dwarf with MeerKAT ', Monthly Notices of the Royal Astronomical Society, vol. 513, no. 3, pp. 3482-3492 . https://doi.org/10.1093/mnras/stac1002
We report on the detection of MKT J174641.0$-$321404, a new radio transient found in untargeted searches of wide-field MeerKAT radio images centred on the black hole X-ray binary H1743$-$322. MKT J174641.0$-$321404 is highly variable at 1.3 GHz and w
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::720510c70825011528fe0fea99241de3
https://lirias.kuleuven.be/handle/20.500.12942/697229
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5
A Late-time Radio Flare Following a Possible Transition in Accretion State in the Tidal Disruption Event AT 2019azh
Autor: Itai Sfaradi, Assaf Horesh, Rob Fender, David A. Green, David R. A. Williams, Joe Bright, Steve Schulze
Publikováno v: Sfaradi, I, Horesh, A, Fender, R, Green, D A, Williams, D R A, Bright, J & Schulze, S 2022, ' A Late-time Radio Flare Following a Possible Transition in Accretion State in the Tidal Disruption Event AT 2019azh ', The Astrophysical Journal, vol. 933, no. 2, 176, pp. 176 . https://doi.org/10.3847/1538-4357/ac74bc
We report here radio follow-up observations of the optical Tidal Disruption Event (TDE) AT 2019azh. Previously reported X-ray observations of this TDE showed variability at early times and a dramatic increase in luminosity, by a factor of $\sim 10$,
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9d210f9cc20c4a596e28eee03ba5f912
https://doi.org/10.3847/1538-4357/ac74bc
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6
Daily variability at milli-arcsecond scales in the radio quiet NLSy1 Mrk 110
Autor: Francesca Panessa, Miguel Pérez-Torres, Lorena Hernández-García, Piergiorgio Casella, Marcello Giroletti, Monica Orienti, Ranieri D Baldi, Loredana Bassani, Maria Teresa Fiocchi, Fabio La Franca, Angela Malizia, Ian McHardy, Fabrizio Nicastro, Luigi Piro, Federico Vincentelli, David R A Williams, Pietro Ubertini
Publikováno v: Digital.CSIC. Repositorio Institucional del CSIC
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The origin of radio emission in the majority of active galactic nuclei is still poorly understood. Various competing mechanisms are likely involved in the production of radio emission and precise diagnostic tools are needed to disentangle them, of wh
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::615b2f63c35705553100c3f04e30c04f
http://hdl.handle.net/20.500.12386/31984
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7
DETECTION OF DELAYED DENSITY DEPENDENCE: REPLY
Autor: Andrew M. Liebhold, David R. W. Williams
Publikováno v: Ecology. 78:320-322
Hansson, L., and H. Hentonen. 1985. Gradients in density variation of small rodents: the importance of latitude and snow cover. Oecologia 67:394-402. Haukioja, E., S. Neuvonen, S. Hanhimaki, and P. Niemeli. 1988. The autumnal moth in Fennoscandia. Pa
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3f8346da3bea15a82140523679c0cb97
https://doi.org/10.1890/0012-9658(1997)078[0320:dodddr]2.0.co
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9
Effects of Climate Change on Forest Insect and Disease Outbreaks
Autor: David R. W. Williams, Robert P. Long, Andrew M. Liebhold, Philip M. Wargo
Publikováno v: Ecological Studies ISBN: 9781461270645
General circulation models (GCMs) predict dramatic future changes in climate for the northeastern and north central United States under doubled carbon dioxide (CO2) levels (Hansen et al., 1984; Manabe and Wetherald, 1987; Wilson and Mitchell, 1987; C
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7b490b9212dae8492f4480cc536595ec
https://doi.org/10.1007/978-1-4612-1256-0_13
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10
Resource Availability and Parasitoid Abundance in the Analysis of Host-Parasitoid Data
Autor: Wayne M. Getz, Michael J. Pitcairn, David R. W. Williams
Publikováno v: Ecology. 71:2372-2374
Population models have suggested that host regulation by natural enemies is achieved by the densitydependent response of natural enemies to temporal and spatial changes in host density. However, surveys of insect host-parasitoid systems (Morrison and
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9cf1b8024227c0c40b5c8557bef720df
https://doi.org/10.2307/1938648
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