Search Results - "O'SULLIVAN, S. P"

Magnetic field strength and spectral distribution of six parsec-scale active galactic nuclei jets by O'Sullivan, S. P., Gabuzda, D. C.

“…We use observations of six ‘blazars’ with the Very Long Baseline Array (VLBA), at eight frequencies (4.6, 5.1, 7.9, 8.9, 12.9, 15.4, 22.2 and 43.1 GHz), to…”
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Complex Faraday depth structure of active galactic nuclei as revealed by broad-band radio polarimetry by O'Sullivan, S. P., Brown, S., Robishaw, T., Schnitzeler, D. H. F. M., McClure-Griffiths, N. M., Feain, I. J., Taylor, A. R., Gaensler, B. M., Landecker, T. L., Harvey-Smith, L., Carretti, E.

“…We present a detailed study of the Faraday depth structure of four bright (>1 Jy), strongly polarized, unresolved radio-loud quasars. The Australia Telescope…”
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Coherent radio emission from a quiescent red dwarf indicative of star–planet interaction by Vedantham, H. K., Callingham, J. R., Shimwell, T. W., Tasse, C., Pope, B. J. S., Bedell, M., Snellen, I., Best, P., Hardcastle, M. J., Haverkorn, M., Mechev, A., O’Sullivan, S. P., Röttgering, H. J. A., White, G. J.

“…Low-frequency ( ν  ≲ 150 MHz) stellar radio emission is expected to originate in the outer corona at heights comparable to and larger than the stellar radius…”
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Improving Graduate Education to Support a Branching Career Pipeline: Recommendations Based on a Survey of Doctoral Students in the Basic Biomedical Sciences by Fuhrmann, C N, Halme, D G, O'Sullivan, P S, Lindstaedt, B

“…Today's doctoral programs continue to prepare students for a traditional academic career path despite the inadequate supply of research-focused faculty…”
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FARADAY ROTATION FROM MAGNESIUM II ABSORBERS TOWARD POLARIZED BACKGROUND RADIO SOURCES by Farnes, J S, O'Sullivan, S P, Corrigan, M E, Gaensler, B M

“…Strong singly ionized magnesium (Mg II) absorption lines in quasar spectra typically serve as a proxy for intervening galaxies along the line of sight…”
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Faraday rotation at low frequencies: magnetoionic material of the large FRII radio galaxy PKS J0636−2036 by O'Sullivan, S P, Lenc, E, Anderson, C S, Gaensler, B M, Murphy, T

“…Abstract We present a low-frequency, broad-band polarization study of the FRII radio galaxy PKS J0636−2036 (z = 0.0551), using the Murchison Widefield Array…”
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The magnetic field strength of the Faraday screen surrounding the radio galaxy Coma A by Knuettel, S, O’Sullivan, S P, Curiel, S, Emonts, B H C

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Three-dimensional magnetic field structure of six parsec-scale active galactic nuclei jets by O'Sullivan, S. P., Gabuzda, D. C.

“…The parsec-scale Faraday rotation measure (RM) distribution of six ‘blazars’ (0954+658, 1156+295, 1418+546, 1749+096, 2007+777 and 2200+420) are investigated…”
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The parsec-scale distributions of intensity, linear polarization and Faraday rotation in the core and jet of Mrk 501 at 8.4–1.6 GHz by Croke, S. M., O'Sullivan, S. P., Gabuzda, D. C.

“…Previous very long baseline interferometry (VLBI) observations of the nearby (z = 0.0337) active galactic nucleus (AGN) Mrk 501 have revealed a complex…”
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GIANT LOBES OF CENTAURUS A RADIO GALAXY OBSERVED WITH THE SUZAKU X-RAY SATELLITE by Stawarz, L, Tanaka, Y T, Madejski, G, O'Sullivan, S P, Cheung, C C, FEAIN, I J, Fukazawa, Y, Gandhi, P, Hardcastle, M J, Kataoka, J

“…We report on Suzaku observations of selected regions within the southern giant lobe of the radio galaxy Centaurus A. In our analysis we focus on distinct X-ray…”
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Radio circular polarization produced in helical magnetic fields in eight active galactic nuclei by Gabuzda, D. C., Vitrishchak, V. M., Mahmud, M., O'Sullivan, S. P.

“…Homan & Lister have recently published circular polarization (CP) detections for 34 objects in the MOJAVE sample – a set of bright, compact active galactic…”
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Multifrequency polarization properties of 10 quasars on decaparsec scales at z > 3 by O'Sullivan, S. P., Gabuzda, D. C., Gurvits, L. I.

“…Global very long baseline interferometry (VLBI) (European VLBI Network + Very Long Baseline Array) polarization observations at 5 and 8.4 GHz of 10…”
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Broad-band, radio spectro-polarimetric study of 100 radiative-mode and jet-mode AGN by O'Sullivan, S. P., Purcell, C. R., Anderson, C. S., Farnes, J. S., Sun, X. H., Gaensler, B. M.

“…Abstract We present the results from a broad-band (1 to 3 GHz), spectro-polarimetry study of the integrated emission from 100 extragalactic radio sources with…”
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Magnetic field evolution in cosmic filaments with LOFAR data by Carretti, E, O’Sullivan, S P, Vacca, V, Vazza, F, Gheller, C, Vernstrom, T, Bonafede, A

“…ABSTRACT Measuring the magnetic field in cosmic filaments reveals how the Universe is magnetized and the process that magnetized it. Using the Rotation…”
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Broadband Radio Polarimetry of Fornax A. I. Depolarized Patches Generated by Advected Thermal Material from NGC 1316 by Anderson, C. S., Gaensler, B. M., Heald, G. H., O'Sullivan, S. P., Kaczmarek, J. F., Feain, I. J.

“…We present observations and analysis of the polarized radio emission from the nearby radio galaxy Fornax A over 1.28-3.1 GHz, using data from the Australia…”
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The Faraday Rotation Measure Grid of the LOFAR Two-metre Sky Survey: Data Release 2 by O’Sullivan, S P, Shimwell, T W, Hardcastle, M J, Tasse, C, Heald, G, Carretti, E, Brüggen, M, Vacca, V, Sobey, C, Van Eck, C L, Horellou, C, Beck, R, Bilicki, M, Bourke, S, Botteon, A, Croston, J H, Drabent, A, Duncan, K, Heesen, V, Ideguchi, S, Kirwan, M, Lawlor, L, Mingo, B, Nikiel-Wroczyński, B, Piotrowska, J, Scaife, A M M, van Weeren, R J

“…ABSTRACT 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)…”
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The radio to GeV picture of PSR B1259-63 during the 2021 periastron passage by Chernyakova, M, Malyshev, D, van Soelen, B, Mc Keague, S, O’Sullivan, S P, Buckley, D

“…ABSTRACT PSR B1259-63 is a gamma-ray binary system with a radio pulsar orbiting an O9.5Ve star, LS 2883, with a period of ${\sim} 3.4$ yr. Close to the…”
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Blazar jet evolution revealed by multi-epoch broad-band radio polarimetry by Anderson, C S, O’Sullivan, S P, Heald, G H, Hodgson, T, Pasetto, A, Gaensler, B M

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New constraints on the magnetization of the cosmic web using LOFAR Faraday rotation observations by O’Sullivan, S P, Brüggen, M, Vazza, F, Carretti, E, Locatelli, N T, Stuardi, C, Vacca, V, Vernstrom, T, Heald, G, Horellou, C, Shimwell, T W, Hardcastle, M J, Tasse, C, Röttgering, H

“…ABSTRACT Measuring the properties of extragalactic magnetic fields through the effect of Faraday rotation provides a means to understand the origin and…”
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Magnetic field strength in cosmic web filaments by Carretti, Ettore, Vacca, V, O’Sullivan, S P, Heald, G H, Horellou, C, Röttgering, H J A, Scaife, A M M, Shimwell, T W, Shulevski, A, Stuardi, C, Vernstrom, T

“…ABSTRACT 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…”
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