Výsledky vyhledávání - "S. P. O'Sullivan"

Akademický článek

Prototype Faraday Rotation Measure Catalogs from the Polarisation Sky Survey of the Universe’s Magnetism (POSSUM) Pilot Observations

Autor: S. Vanderwoude, J. L. West, B. M. Gaensler, L. Rudnick, C. L. Van Eck, A. J. M. Thomson, H. Andernach, C. S. Anderson, E. Carretti, G. H. Heald, J. P. Leahy, N. M. McClure-Griffiths, S. P. O’Sullivan, M. Tahani, A. G. Willis

Publikováno v: The Astronomical Journal, Vol 167, Iss 5, p 226 (2024)

The Polarisation Sky Survey of the Universe’s Magnetism (POSSUM) will conduct a sensitive ∼1 GHz radio polarization survey covering 20,000 deg ^2 of the southern sky with the Australian Square Kilometre Array Pathfinder. In anticipation of the fu

Externí odkaz: https://doaj.org/article/d2e4de9e984646d9b93b25fd21d34f35

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The redshift evolution of extragalactic magnetic fields

Autor: V P Pomakov, S P O’Sullivan, M Brüggen, F Vazza, E Carretti, G H Heald, C Horellou, T Shimwell, A Shulevski, T Vernstrom

Publikováno v: Monthly Notices of the Royal Astronomical Society, 515(1), 256-270

Faraday rotation studies of distant radio sources can constrain the evolution and the origin of cosmic magnetism. We use data from the LOFAR Two Metre Sky Survey: Data Release 2 (LoTSS DR2) to study the dependence of the Faraday rotation measure (RM)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ccb5ee13784b5946b6dd378b742e9d56
https://doi.org/10.1093/mnras/stac1805

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Magnetic field strength in cosmic web filaments

Autor: Ettore Carretti, V Vacca, S P O’Sullivan, G H Heald, C Horellou, H J A Röttgering, A M M Scaife, T W Shimwell, A Shulevski, C Stuardi, T Vernstrom

Publikováno v: Monthly Notices of the Royal Astronomical Society, 512(1), 945-959

We used the Rotation Measure (RM) catalogue derived from the LOFAR Two-metre Sky Survey Data Release 2 (LoTSS DR2) at 144-MHz to measure the evolution with redshift of the extragalactic RM (RRM: Residual RM) and the polarization fraction ($p$) of sou

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8fb0d7897923559d4ad84f487131e994
https://doi.org/10.1093/mnras/stac384

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A 600 kpc complex radio source at the center of Abell 3718 discovered by the EMU and POSSUM surveys

Autor: F. Loi, M. Brienza, C. J. Riseley, L. Rudnick, W. Boschin, L. Lovisari, E. Carretti, B. Koribalski, C. Stuardi, S. P. O’Sullivan, A. Bonafede, M. D. Filipović, A. Hopkins

Multifrequency studies of galaxy clusters are crucial for inferring their dynamical states and physics. Moreover, these studies allow us to investigate cluster-embedded sources, whose evolution is affected by the physical and dynamical condition of t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::38c87a31a9abf7ac6dcabbf6718d42e9
http://arxiv.org/abs/2302.03709

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Detection of magnetic fields in the circumgalactic medium of nearby galaxies using Faraday rotation

Autor: V. Heesen, S. P. O’Sullivan, M. Brüggen, A. Basu, R. Beck, A. Seta, E. Carretti, M. G. H. Krause, M. Haverkorn, S. Hutschenreuter, A. Bracco, M. Stein, D. J. Bomans, R.-J. Dettmar, K. T. Chyży, G. H. Heald, R. Paladino, C. Horellou

Publikováno v: Astronomy & Astrophysics, 670, pp. 1-5
Astronomy & Astrophysics, 670, 1-5

Context. The existence of magnetic fields in the circumgalactic medium (CGM) is largely unconstrained. Their detection is important as magnetic fields can have a significant impact on the evolution of the CGM and, in turn, the fields can serve as tra

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0fe40abcc103b3cabb857ac9bf79dd0c
https://repository.ubn.ru.nl/handle/2066/290178

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The Faraday Rotation Measure Grid of the LOFAR Two-metre Sky Survey: Data Release 2

A Faraday rotation measure (RM) catalogue, or RM Grid, is a valuable resource for the study of cosmic magnetism. Using the second data release (DR2) from the LOFAR Two-metre Sky Survey (LoTSS), we have produced a catalogue of 2461 extragalactic high-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::162a3e0ba9936f99d92b996598175a09

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Magnetic field evolution in cosmic filaments with LOFAR data

Autor: E Carretti, S P O’Sullivan, V Vacca, F Vazza, C Gheller, T Vernstrom, A Bonafede

Measuring the magnetic field in cosmic filaments reveals how the Universe is magnetised and the process that magnetised it. Using the Rotation Measures (RM) at 144-MHz from the LoTSS DR2 data, we analyse the rms of the RM extragalactic component as a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::84b52ea86efa1cc7f0d67c934bfabafa
http://hdl.handle.net/20.500.12386/33971

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Searching for pulsars associated with polarised point sources using LOFAR: Initial discoveries from the TULIPP project

Autor: C. Sobey, C. G. Bassa, S. P. O’Sullivan, J. R. Callingham, C. M. Tan, J. W. T. Hessels, V. I. Kondratiev, B. W. Stappers, C. Tiburzi, G. Heald, T. Shimwell, R. P. Breton, M. Kirwan, H. K. Vedantham, E. Carretti, J.-M. Grießmeier, M. Haverkorn, A. Karastergiou

Publikováno v: Astronomy & Astrophysics, 661, pp. 1-15
Astronomy & Astrophysics, 661, 1-15
Astronomy and astrophysics, 661:A87. EDP Sciences
Astronomy & Astrophysics, 661:A87
Astronomy & Astrophysics, 661:A87. EDP Sciences

Discovering radio pulsars, particularly millisecond pulsars (MSPs), is important for a range of astrophysical applications, such as testing theories of gravity or probing the magneto-ionic interstellar medium. We aim to discover pulsars that may have

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a44d31a60dea28859ee02dc32b6af940
http://arxiv.org/abs/2203.08331

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Metal-THINGS: Association and optical characterization of supernova remnants with H I holes in NGC 6946

Autor: M. A. Lara-López, L. S. Pilyugin, J. Zaragoza-Cardiel, I. A. Zinchenko, O. López-Cruz, S. P. O’Sullivan, M. E. De Rossi, S. Dib, L. E. Garduño, M. Rosado, M. Sánchez-Cruces, M. Valerdi

Publikováno v: Astronomy & Astrophysics. 669:A25

Context. NGC 6946, also known as the “Fireworks Galaxy”, is an unusual galaxy that hosts a total of 225 supernova remnant (SNR) candidates, including 147 optically identified with high [S II]/Hα line ratios. In addition, this galaxy shows promin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a985f9b88338085367236d8ef3dce00a
https://doi.org/10.1051/0004-6361/202245068

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The Turkish Conquest of Anatolia in the Eleventh Century

Autor: S P O'Sullivan

Publikováno v: Hawliyat. 8:41-93

The article describes the Turkish conquest of Anatolia in the second half of the eleventh century. An evaluation of the sources (almost all Greek) and a sum- mary of the successful Byzantine defence against the Arabs is followed by a detailed account

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a8f74675f5dfde3eac28dba6b12769b8
https://doi.org/10.31377/haw.v8i0.335

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