Zobrazeno 1 - 10
of 51
pro vyhledávání: '"Leith Godfrey"'
Autor:
Ross J. Turner, Martin J. Hardcastle, Raffaella Morganti, Stanislav S. Shabala, N. Jurlin, Martin Krause, M. Brienza, Leith Godfrey
Publikováno v:
Monthly Notices of the Royal Astronomical Society, 496(2), 1706-1717. Oxford University Press
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society
Feedback from radio jets associated with Active Galactic Nuclei (AGN) plays a profound role in the evolution of galaxies. Kinetic power of these radio jets appears to show temporal variation, but the mechanism(s) responsible for this process are not
Autor:
Alastair C. Edge, Bradford Snios, Michael W. Wise, William G. Mathews, Robert Laing, Martin J. Hardcastle, Paul Nulsen, Ryan T. Duffy, M. N. de Vries, Leith Godfrey, Chris Carilli, D. Rafferty, Mark Birkinshaw, Judith H. Croston, Richard A. Perley, Brian R. McNamara, John McKean, Diana M Worrall
Publikováno v:
Duffy, R T, Worrall, D M, Birkinshaw, M, Nulsen, P E J, Wise, M W, de Vries, M N, Snios, B, Mathews, W G, Perley, R A, Hardcastle, M J, Rafferty, D A, McNamara, B R, Edge, A C, McKean, J P, Carilli, C L, Croston, J H, Godfrey, L E H & Laing, R A 2018, ' The X-ray ribs within the cocoon shock of Cygnus A ', Monthly Notices of the Royal Astronomical Society, vol. 476, no. 4, pp. 4848-4860 . https://doi.org/10.1093/mnras/sty549
Monthly Notices of the Royal Astronomical Society, 476(4), 4848-4860. Oxford University Press
Monthly notices of the Royal Astronomical Society, 2018, Vol.476(4), pp.4848-4860 [Peer Reviewed Journal]
Monthly Notices of the Royal Astronomical Society, 476(4), 4848-4860. Oxford University Press
Monthly notices of the Royal Astronomical Society, 2018, Vol.476(4), pp.4848-4860 [Peer Reviewed Journal]
We use new and archival Chandra observations of Cygnus A, totalling $\sim$1.9 Ms, to investigate the distribution and temperature structure of gas lying within the projected extent of the cocoon shock and exhibiting a rib-like structure. We confirm t
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 466:2294-2301
Jet powers in many radio galaxies with extended radio structures appear to exceed their associated accretion luminosities. In systems with very low accretion rates, this is likely due to the very low accretion luminosities resulting from radiatively
Autor:
Matteo Murgia, J. H. Croston, Huub Röttgering, Volker Heesen, Michael W. Wise, M. Brienza, Martin J. Hardcastle, Philip Best, Emanuela Orrú, Leith Godfrey, Aleksandar Shulevski, Elizabeth K. Mahony, Judith Ineson, Raffaella Morganti, Adam Stewart, Jeremy J. Harwood, Huib Intema
Publikováno v:
Monthly Notices of the Royal Astronomical Society, 458, 4, pp. 4443-4455
Harwood, J J, Croston, J H, Intema, H T, Stewart, A J, Ineson, J, Hardcastle, M J, Godfrey, L, Best, P, Brienza, M, Heesen, V, Mahony, E K, Morganti, R, Murgia, M, Orrú, E, Röttgering, H, Shulevski, A & Wise, M W 2016, ' FR II radio galaxies at low frequencies-I. Morphology, magnetic field strength and energetics ', Monthly Notices of the Royal Astronomical Society, vol. 458, no. 4, pp. 4443-4455 . https://doi.org/10.1093/mnras/stw638
Monthly Notices of the Royal Astronomical Society, 458(4), 4443-4455. Oxford University Press
Monthly Notices of the Royal Astronomical Society, 458, 4443-4455
Monthly Notices of the Royal Astronomical Society, 458, 4443-4455. Oxford University Press
Monthly Notices of the Royal Astronomical Society
Harwood, J J, Croston, J H, Intema, H T, Stewart, A J, Ineson, J, Hardcastle, M J, Godfrey, L, Best, P, Brienza, M, Heesen, V, Mahony, E K, Morganti, R, Murgia, M, Orrú, E, Röttgering, H, Shulevski, A & Wise, M W 2016, ' FR II radio galaxies at low frequencies-I. Morphology, magnetic field strength and energetics ', Monthly Notices of the Royal Astronomical Society, vol. 458, no. 4, pp. 4443-4455 . https://doi.org/10.1093/mnras/stw638
Monthly Notices of the Royal Astronomical Society, 458(4), 4443-4455. Oxford University Press
Monthly Notices of the Royal Astronomical Society, 458, 4443-4455
Monthly Notices of the Royal Astronomical Society, 458, 4443-4455. Oxford University Press
Monthly Notices of the Royal Astronomical Society
Due to their steep spectra, low-frequency observations of FR II radio galaxies potentially provide key insights in to the morphology, energetics and spectrum of these powerful radio sources. However, limitations imposed by the previous generation of
Autor:
Stanislav S. Shabala, Leith Godfrey
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 456:1172-1184
The kinetic power of radio jets is a quantity of fundamental importance to studies of the AGN feedback process and radio galaxy physics. A widely used proxy for jet power is the extended radio luminosity. A number of empirical methods have been used
Autor:
Martin J. Hardcastle, Huib Intema, Aleksandar Shulevski, Jeremy J. Harwood, I. Prandoni, Leith Godfrey, K. Rajpurohit, V. H. Mahatma, T. Duchet, Timothy W. Shimwell, Raffaella Morganti, Marisa Brienza
Publikováno v:
Astronomy & Astrophysics, 638, A29
Astronomy & Astrophysics
Astronomy & astrophysics, 638:A29. EDP Sciences
Astronomy & Astrophysics
Astronomy & astrophysics, 638:A29. EDP Sciences
Restarted radio galaxies represent a unique tool to investigate the duty cycle of the jet activity in Active Galactic Nuclei. Due to a sharp discontinuity of the GHz spectral index distribution within its lobes, the radio galaxy 3C388 has for long be
Autor:
Martin J. Hardcastle, Robert A. Laing, Paul Nulsen, Martijn de Vries, David Rafferty, Leith Godfrey, Mark Birkinshaw, Judith H. Croston, Ryan T. Duffy, Michael W. Wise, Brian R. McNamara, Chris L. Carilli, John McKean, Richard A. Perley, Alastair C. Edge, Bradford Snios, Andrew J. Young, Daniel E. Harris, William G. Mathews, Diana M Worrall, Ralph P. Kraft
Publikováno v:
Snios, B, Nulsen, P E J, Wise, M W, Vries, M D, Birkinshaw, M, Worrall, D M, Duffy, R T, Kraft, R P, McNamara, B R, Carilli, C, Croston, J H, Edge, A C, Godfrey, L E H, Hardcastle, M J, Harris, D E, Laing, R A, Mathews, W G, McKean, J P, Perley, R A, Rafferty, D A & Young, A J 2018, ' The Cocoon Shocks of Cygnus A : Pressures and Their Implications for the Jets and Lobes ', Astrophysical Journal, vol. 855, no. 1, pp. 855-871 . https://doi.org/10.3847/1538-4357/aaaf1a
Astrophysical Journal, 855(1):71. IOP Publishing Ltd.
Astrophysical journal, 2018, Vol.855(1), pp.71 [Peer Reviewed Journal]
Astrophysical Journal, 855(1):71. IOP Publishing Ltd.
Astrophysical journal, 2018, Vol.855(1), pp.71 [Peer Reviewed Journal]
We use 2.0 Msec of Chandra observations to investigate the cocoon shocks of Cygnus A and some implications for its lobes and jet. Measured shock Mach numbers vary in the range 1.18-1.66 around the cocoon. We estimate a total outburst energy of $\sime
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d37f63b9c35fb524c635d7bfc36f13e8
Autor:
Rob Ivison, Markos Georganopoulos, Martin A. Zwaan, Ivan Oteo, Eileen T. Meyer, Robert Laing, Peter Breiding, Leith Godfrey
Publikováno v:
Meyer, E T, Breiding, P, Georganopoulos, M, Oteo, I, Zwaan, M A, Laing, R, Godfrey, L & Ivison, R J 2017, ' New ALMA and Fermi/LAT Observations of the Large-scale Jet of PKS 0637-752 Strengthen the Case Against the IC/CMB Model ', Astrophysical Journal Letters, vol. 835, no. 2, L35 . https://doi.org/10.3847/2041-8213/835/2/L35
The Chandra X-ray observatory has discovered several dozen anomalously X-ray-bright jets associated with powerful quasars. A popular explanation for the X-ray flux from the knots in these jets is that relativistic synchrotron-emitting electrons inver
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9770ab91accd5b4a1e108cc0280f148d
Publikováno v:
Monthly Notices of the Royal Astronomical Society, 471(1), 891-907. Oxford University Press
The purpose of this work is two-fold: (1) to quantify the occurrence of ultrasteep spectrum remnant Fanaroff-Riley type II (FRII) radio galaxies in a 74 MHz flux-limited sample, and (2) perform Monte Carlo simulations of the population of active and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::547ba5ffb90b9d479ca51e196053d76c
https://research.rug.nl/en/publications/a8944206-6749-4112-ad2d-8ec6128293cc
https://research.rug.nl/en/publications/a8944206-6749-4112-ad2d-8ec6128293cc
Autor:
D. D. Mulcahy, Michael W. Wise, Aleksandar Shulevski, Marco Iacobelli, M. Pandey-Pommier, Antonia Rowlinson, George Heald, G. Gürkan, Adam Stewart, Jeremy J. Harwood, Emanuela Orru, Błażej Nikiel-Wroczyński, C. J. Riseley, Anna M. M. Scaife, John McKean, Leith Godfrey, R. Pizzo, M. de Vries, Huib Intema, Cyril Tasse, J. W. Broderick, G. Kokotanekov, Chiara Ferrari, D. A. Rafferty, D. Carbone, V. N. Pandey, Judith H. Croston, Huub Röttgering, Luke Pratley, A. O. Clarke, Laura Birzan, Annalisa Bonafede, A. J. van der Horst, Rene P. Breton, R. J. van Weeren, W. Jurusik, Martin J. Hardcastle, S. S. Sridhar
Publikováno v:
Astron.Astrophys.
Astron.Astrophys., 2017, 605, pp.A48. ⟨10.1051/0004-6361/201730940⟩
Astronomy & astrophysics, 605:A48. EDP Sciences
Astron.Astrophys., 2017, 605, pp.A48. 〈10.1051/0004-6361/201730940〉
NASA Astrophysics Data System
Astronomy & Astrophysics, 605, pp. 1-20
Astronomy & Astrophysics, 605:A48. EDP Sciences
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2017, 605, pp.A48. ⟨10.1051/0004-6361/201730940⟩
Astronomy & Astrophysics, 605, 1-20
Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 605, pp.A48. ⟨10.1051/0004-6361/201730940⟩
Kokotanekov, G, Wise, M, Heald, G H, McKean, J P, Bîrzan, L, Rafferty, D A, Godfrey, L E H, De Vries, M, Intema, H T, Broderick, J W, Hardcastle, M J, Bonafede, A, Clarke, A O, Van Weeren, R J, Röttgering, H J A, Pizzo, R, Iacobelli, M, Orrú, E, Shulevski, A, Riseley, C J, Breton, R P, Nikiel-Wroczyński, B, Sridhar, S S, Stewart, A J, Rowlinson, A, Van Der Horst, A J, Harwood, J J, Gürkan, G, Carbone, D, Pandey-Pommier, M, Tasse, C, Scaife, A M M, Pratley, L, Ferrari, C, Croston, J H, Pandey, V N, Jurusik, W & Mulcahy, D D 2017, ' LOFAR MSSS : The scaling relation between AGN cavity power and radio luminosity at low radio frequencies ', Astronomy and Astrophysics, vol. 605, A48 . https://doi.org/10.1051/0004-6361/201730940
Astron.Astrophys., 2017, 605, pp.A48. ⟨10.1051/0004-6361/201730940⟩
Astronomy & astrophysics, 605:A48. EDP Sciences
Astron.Astrophys., 2017, 605, pp.A48. 〈10.1051/0004-6361/201730940〉
NASA Astrophysics Data System
Astronomy & Astrophysics, 605, pp. 1-20
Astronomy & Astrophysics, 605:A48. EDP Sciences
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2017, 605, pp.A48. ⟨10.1051/0004-6361/201730940⟩
Astronomy & Astrophysics, 605, 1-20
Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 605, pp.A48. ⟨10.1051/0004-6361/201730940⟩
Kokotanekov, G, Wise, M, Heald, G H, McKean, J P, Bîrzan, L, Rafferty, D A, Godfrey, L E H, De Vries, M, Intema, H T, Broderick, J W, Hardcastle, M J, Bonafede, A, Clarke, A O, Van Weeren, R J, Röttgering, H J A, Pizzo, R, Iacobelli, M, Orrú, E, Shulevski, A, Riseley, C J, Breton, R P, Nikiel-Wroczyński, B, Sridhar, S S, Stewart, A J, Rowlinson, A, Van Der Horst, A J, Harwood, J J, Gürkan, G, Carbone, D, Pandey-Pommier, M, Tasse, C, Scaife, A M M, Pratley, L, Ferrari, C, Croston, J H, Pandey, V N, Jurusik, W & Mulcahy, D D 2017, ' LOFAR MSSS : The scaling relation between AGN cavity power and radio luminosity at low radio frequencies ', Astronomy and Astrophysics, vol. 605, A48 . https://doi.org/10.1051/0004-6361/201730940
International audience; We present a new analysis of the widely used relation between cavity power and radio luminosity in clusters of galaxies with evidence for strong AGN feedback. We studied the correlation at low radio frequencies using two new s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d75296627d75d3d625135c80e0ead00e
https://hal.archives-ouvertes.fr/hal-01645689
https://hal.archives-ouvertes.fr/hal-01645689