Browsing Research publications by Title

Now showing items 22803-22822 of 22903

    • X-ray observations of low-power radio galaxies from the B2 catalogue 

      Canosa, C.M.; Worrall, D.M.; Hardcastle, M.J.; Birkinshaw, M. (1999)
      We present an analysis of X-ray data, taken with ROSAT, for a well defined sample of low-power radio galaxies from the Bologna B2 catalogue. Where possible, the HRI has been used in order to take advantage of the higher ...

    • X-Ray Observations of Superbubbles in Dwarf Galaxies 

      Brinks, E.; Walter, F.; Kerp, J. (Revista Mexicana de Astronom a y Astrof sica, 2000)
      There is plenty of evidence from neutral hydrogen observations for a violent interstellar medium, dominated by hot-plasma filled superbubbles. However, there are few direct observations of their thermal X-ray emission from ...

    • X-ray properties of the Youngest Radio Sources and their Environments 

      Siemiginowska, Aneta; Sobolewska, Malgosia; Migliori, Giulia; Guainazzi, Matteo; Hardcastle, M.J.; Ostorero, Luisa; Stawarz, Lukasz (2016-05-23)
      We present the first results from our X-ray study of young radio sources classified as compact symmetric objects (CSOs). Using the Chandra X-ray Observatory we observed six CSOs for the first time in X-rays, and re-observed ...

    • The X-ray Ribs Within the Cocoon Shock of Cygnus A 

      Duffy, R. T.; Worrall, D. M.; Birkinshaw, M.; Nulsen, P. E. J.; Wise, M. W.; Vries, M. N. de; 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. (2018-06-01)
      We use new and archival Chandra observations of Cygnus A, totalling ~1.9Ms, to investigate the distribution and temperature structure of gas lying within the projected extent of the cocoon shock and exhibiting a rib-like ...

    • The X-ray spectra of the luminous LMXBs in NGC 3379 : field and globular cluster sources 

      Brassington, Nicola; Fabbiano, G.; Blake, S.; Zezas, A.; Angelini, L.; Davies, R. L.; Gallagher, J.; Kalogera, V.; Kim, D. -W.; King, A. R.; Kundu, A.; Trinchieri, G.; Zepf, S. (2010-12)
      From a deep multi-epoch Chandra observation of the elliptical galaxy NGC 3379 we report the spectral properties of eight luminous LMXBs (L-X > 1.2 x 10(38) erg s(-1)). We also present a set of spectral simulations, produced ...

    • An X-Ray Study of Magnetic Field Strengths and Particle Content in the Lobes of FR II Radio Sources 

      Croston, J.H.; Hardcastle, M.J.; Harris, D.E.; Belsole, E.; Birkinshaw, M.; Worrall, D.M. (2005-05)

    • An X-ray survey of the 2 Jy sample - II. X-ray emission from extended structures 

      Mingo, B.; Hardcastle, M. J.; Ineson, J.; Mahatma, V.; Croston, J. H.; Dicken, D.; Evans, D. A.; Morganti, R.; Tadhunter, C.N. (2017-09-21)
      The 2 Jy sample is a survey of radio galaxies with flux densities above 2 Jy at 2.7 GHz. As part of our ongoing work on the southern subset of 2 Jy sources, in paper I of this series we analysed the X-ray cores of the ...

    • An X-ray survey of the 2 Jy sample-I : Is there an accretion mode dichotomy in radio-loud AGN? 

      Mingo, B.; Hardcastle, M.J.; Croston, J.H.; Dicken, D.; Evans, D. A.; Morganti, R.; Tadhunter, C. (2014-05-01)
      We carry out a systematic study of the X-ray emission from the active nuclei of the 0.02 < z< 0.7 2 Jy sample, using Chandra and XMM-Newton observations.We combine our results with those from mid-infrared, optical emission-line ...

    • X-ray Synchrotron Radiation and Particle Acceleration 

      Hardcastle, M.J. (2004)
      I discuss X-ray synchrotron emission as a probe of particle acceleration, concentrating mainly on low-power (FRI) jets but also touching on the hotspots in FRII sources. Combining X-ray and radio data has allowed us to ...

    • X-shooting Herbig Ae/Be stars : accretion probed by near-infrared He I emission 

      Oudmaijer, R.D.; van den Ancker, M.E.; Baines, D.; Caselli, P.; Drew, J.E.; Hoare, M.G.; Lumsden, S.; Montesinos, B.; Sim, S.; Vink, J.S.; Wheelwright, H.E.; de Wit, W.J. (2011)
      The Herbig Ae/Be stars are intermediate mass pre-main sequence stars that bridge the gap between the low mass T Tauri stars and the Massive Young Stellar Objects. In this mass range, the acting star forming mechanism ...

    • XDR Chemistry in the Circumnuclear Disk of NGC 1068 

      Usero, A.; Garcia-Burillo, S.; Fuente, A.; Martin-Pintado, J. (Astronomical Society of the Pacific, 2004)
      We have studied the feedback in°uence that the central engine of the Seyfert 2 galaxy NGC 1068 may have on the chemistry of the 200 pc circumnuclear gas disk (CND). With this purpose, we have conducted a multispecies/ ...

    • xDSL Network Upgrade Employing FPGAs 

      Milosavljevic, M.; Bensaali, F.; Kourtessis, P. (Institute of Electrical and Electronics Engineers (IEEE), 2008)
      This paper proposes an upgrade scenario for xDSL networks to provide broadband access for extendedlink lengths while demonstrating network grooming bymeans of more than one subscriber using a single network connection ...

    • The XMM-Newton and Spitzer View of Galaxy/AGN Formation at z = 2-3 

      Carrera, F.J.; Ebrero, J.; Page, M. J.; Stevens, Jason (European Space Agency (ESA), 2006-01-01)
      The genesis of spheroids is central to our understanding of galaxy formation. They contain half of the stellar mass of the Universe, and almost all of the black hole mass. According to galaxy formation models, cluster ...

    • XMM-Newton observations of the hot-gas atmospheres of 3C 66B and 3C 449 

      Croston, J.H.; Hardcastle, M.J.; Birkinshaw, M.; Worrall, D.M. (2003-12)

    • XMM-Newton Observations of the Nuclei of the Radio Galaxies 3C 305, DA 240, and 4C 73.08 

      Evans, D.A.; Hardcastle, M.J.; Lee, J.C.; Kraft, R.P.; Worrall, D.M.; Birkinshaw, M.; Croston, J.H. (2008)
      We present new XMM-Newton EPIC observations of the nuclei of the nearby radio galaxies 3C 305, DA 240, and 4C 73.08, and investigate the origin of their nuclear X-ray emission. The nuclei of the three sources appear to ...

    • XMM-Newton Observations of Three High Redshift Radio Galaxies 

      Belsole, E.; Worrall, D.M.; Hardcastle, M.J. (2004)
      We present results on the physical states of three highredshift powerful radio galaxies (3C292 atz = 0.7, 3C184 at z= 1, and 3C322 atz = 1.7). They were obtained by combining radio measurements with X-ray measurements from ...

    • XMM-Newton observations of three high-redshift radio galaxies 

      Belsole, E.; Worrall, D.M.; Hardcastle, M.J.; Birkinshaw, M.; Lawrence, C.R. (2004-08)

    • An XMM-Newton study of the environments, particle content and impact of low-power radio galaxies 

      Croston, J.H.; Hardcastle, M.J.; Birkinshaw, M.; Worrall, D.M.; Laing, R.A. (2008)

    • XMM-Newton surveys of the Canada-France Redshift Survey fields - I. The submillimetre/X-ray relation 

      Waskett, T.J.; Eales, S.; Gear, W.K.; Puchnarewicz, E.M.; Lilly, S.; Flores, H.; Webb, T.; Clements, D.; Stevens, J. A.; Thuan, T.X. (2003-06)

    • XUE: Molecular Inventory in the Inner Region of an Extremely Irradiated Protoplanetary Disk 

      Ramírez-Tannus, María Claudia; Bik, Arjan; Cuijpers, Lars; Waters, Rens; Göppl, Christiane; Henning, Thomas; Kamp, Inga; Preibisch, Thomas; Getman, Konstantin V.; Chaparro, Germán; Cuartas-Restrepo, Pablo; de Koter, Alex; Feigelson, Eric D.; Grant, Sierra L.; Haworth, Thomas J.; Hernández, Sebastián; Kuhn, Michael A.; Perotti, Giulia; Povich, Matthew S.; Reiter, Megan; Roccatagliata, Veronica; Sabbi, Elena; Tabone, Benoît; Winter, Andrew J.; McLeod, Anna F.; van Boekel, Roy; van Terwisga, Sierk E. (2023-12-01)
      We present the first results of the eXtreme UV Environments (XUE) James Webb Space Telescope (JWST) program, which focuses on the characterization of planet-forming disks in massive star-forming regions. These regions are ...