Browsing by Author "Axon, David"

Now showing items 1-20 of 26

    • Equatorial scattering and the structure of the broad-line region in Seyfert nuclei: Evidence for a rotating disc 

      Smith, James; Robinson, Andrew; Young, Stuart; Axon, David; Corbett, Elizabeth (Blackwell Publishing: Monthly Notices of the Royal Astronomical Society, 2005-05)
      We present detailed scattering models confirming that distinctive variations in polarization across the broad Halpha line, which are observed in a significant fraction of Seyfert 1 galaxies, can be understood in terms of ...

    • The evidence for jet-cloud interactions in a sample of high/intermediate-redshift radio galaxies 

      Solorzano-Inarrea, Carmen; Tadhunter, Clive; Axon, David (Blackwell Publishing: Monthly Notices of the Royal Astronomical Society, 2001-05)
      We present detailed long-slit spectroscopic observations of a sample of four powerful radio galaxies, with intermediate/high redshifts (0.47 < z < 0.81). The observations cover the rest-wavelength range 2600 °A- 6600 °A, ...

    • Executive Summary of the PhD & Masters Degree Programs in Astrophysical Sciences & Technology - Approved 4/19/2007 

      Axon, David; Gatley, Ian (2007-04-12)

    • High resolution studies of radio sources in the Hubble Deep and Flanking Fields 

      Muxlow, Tom; Richards, Anita; Garrington, Simon; Wilkinson, Peter; Anderson, Bryan; Richards, Eric; Axon, David; Fomalont, Edward; Kellermann, Kenneth; Partridge, Bruce; Windhorst, Rogier (Blackwell Publishing: Monthly Notices of the Royal Astronomical Society, 2005-04)
      Eighteen days of MERLIN data and 42 hours of A-array VLA data at 1.4 GHz have been combined to image a 10-arcmin field centred on the Hubble Deep and Flanking Fields (HDF and HFF). A complete sample of 92 radio sources ...

    • Highly polarized structures in the near-nuclear regions of Cygnus A: Intrinsic anisotropy within the cones? 

      Tadhunter, Clive; Sparks, William; Axon, David; Bergeron, Louis; Jackson, Neal; Packham, Christopher; Hough, James; Robinson, Andrew; Young, Stuart (Blackwell Publishing: Monthly Notices of the Royal Astronomical Society, 2000-04)
      We present near-IR imaging polarimetry observations of the nucleus of Cygnus A, taken with the NICMOS camera of the HST at a wavelength of 2.0µm. These maps reveal a highly collimated region of polarized emission straddling ...

    • The jet and circumnuclear environment of 3C 293 

      Floyd, David; Perlman, Eric; Leahy, J. Patrick; Beswick, Rob; Jackson, Neal; Sparks, William; Axon, David; O’Dea, Christopher (Astrophysical Journal, 2006-03-01)
      We present the new HST near-infrared polarimetry, broad and narrow-band imaging, and MERLIN 4.5GHz Multi-Frequency Synthesis radio imaging of 3C 293, a unique radio galaxy whose host is an obvious merger remnant, in an ...

    • Jet driven motions in the Narrow Line region of NGC1068 

      Axon, David; Marconi, Alessandro; Capetti, Alessandro; Macchetto, Duccio; Schreier, Ethan; Robinson, Andrew (Springer Netherlands: Astrophysics and Space Science, 1997-03)
      We have obtained HST FOC f/48 long-slit spectroscopy of the inner 4" of the Narrow Line Region of NGC 1068 between 3500-5400A with a spectral resolution of 1.78A/pixel. At a spatial scale of 0.0287" per pixel these data ...

    • The large scale distribution of warm ionized gas around nearby radio galaxies with jet-cloud interactions 

      Tadhunter, Clive; Villar-Martin, Montse; Morganti, Raffaella; Bland-Hawthorn, Joss; Axon, David (Blackwell Publishing: Monthly Notices of the Royal Astronomical Society, 2000-06)
      Deep, narrow-band Halpha observations taken with the TAURUS Tunable Filter (TTF) on the 4.2m WHT telescope are presented for two nearby radio galaxies with strong jet-cloud interactions. Although the brightest emission ...

    • The nature of the HE0450-2958 system 

      Merritt, David; Bergmann, Thaisa; Robinson, Andrew; Batcheldor, Dan; Axon, David; Fernandes, Roberto (Blackwell Publishing, 2005-11-10)
      Magain et al. (2005) argued that the host galaxy of the quasar in HE0450-2958 is substantially under-luminous given the likely mass of its nuclear black hole. Using kinematical information from the spectra of the quasar ...

    • Observations of the neutral gas and dust in the radio galaxy 3C305 

      Jackson, Neal; Beswick, Rob; Pedlar, Alan; Cole, G.; Sparks, William; Leahy, Patrick; Axon, David (Blackwell Publishing: Monthly Notices of the Royal Astronomical Society, 2003-01)
      We present MERLIN and Hubble Space Telescope (HST) observations of the central region of the nearby radio galaxy 3C305 and use them to study the gas and dust in this object. TheMERLIN observations are of neutral hydrogen ...

    • PKS2250-41 and the role of jet-cloud interactions in powerful radio galaxies (full paper) 

      Villar-Martin, Montse; Tadhunter, Clive; Morganti, Raffaella; Axon, David; Koekemoer, Anton (Blackwell Publishing: Monthly Notices of the Royal Astronomical Society, 1999-02)
      We present high resolution, long-slit spectra of the jet-cloud interaction in the powerful southern radio galaxy PKS2250-41.We have resolved the emission lines into two main kinematic components: a broad component (FWHM ...

    • RIT Undergraduate Symposium 2005 

      Bodell, A.; Williams, Scott; Ibrahim, Ahmed; Wilson, Jacquelyn; Pagano, Todd; Regula, A.; Robinson, Andrew; Axon, David; Varble, A.; Hammond, W.; Ferran, Maureen; Basener, William; Entenberg, Alan; Talbot, Justin; Debies, T.; Greeson, Nikole; Meade, Jeff; Worman, James; Donahue, Margret; Guggemos, Nick; Cress, Cory; Roberts, M.; Evans, Irene; Parekh, Bhavin; Kurinec, Santosh; Sinisgalli, Natalie; Savka, Michael; Wilson, Richard; Salvaggio, Carl; Mejia, Omar; Smith, Nakesha; Sarchet, S.; Curran, Patrick; Whiting, P.; Xiao, Danny; Walvoord, R.; Landi, Brian; Messinger, David; Korfmacher, Karl; Mueller, E.; Watkins, Amanda; Narayan, Darren; Skuse, Gary; Ewbank, Dale; Okeke, Nkiruka; Denno, P.; Plummer, P.; Langner, Andreas; Collison, Christina; Younker, J.; Wright, G.; Shipman, Paul; Landi, Brian; Barker, S.; Osier, Michael; Scott, Russell; Pearce, D.; Raish, K.; Burr, Thomas; Ballard, Sarah; Loesch, B.; Illingsworth, Marvin; Taylor, Samantha; Erickson, C.; Phillips, Daniel; Brady, B.; Frisina, D. Robert; Delva, E.; Newman, Dina; Sipos, B.; Richter, E.; Ruf, Herbert; DiLeo, Roberta; Raffaelle, Ryne; Daley, Christopher; Koestler, Devin; DeLorenzo, Joseph; Schauerman, C.; Denial, Sarah; Fuller, Lynn; Craig, Paul; Adameck, Julie; Cotman, B.; O'Handley, Suzanne; Hinke, Emma; Wiandt, Tamas; Jaeger, D.; Brandon, J.; Tubbs, Laura; Topley, E.; DeCelles, G.; Doolittle, Richard; Berns, Roy; Gregg, Elizabeth; Franklin, Scott; Buchanan, Catherine; Onyeke, E.; Grande, C.; Kistner, Jason; Clark, Pat; Binotto, E.; Privon, G.; O'Dea, Christopher; Filby, J.; Golebiewski, L.; Brazeau, H.; Baum, Stefi; Kharb, P.; Kohn, J.; Takacs, Gerald; Pappas, Brandi; Thurston, George; Bavelier, Daphne; Guidon, A.; Yi, Hye Yon; Kuhl, Michael; Lowe, Nathaniel; Sheibley, D.; Gallagher, J.; Helguera, Maria; Banach, Steve; Rubenstein, L.; Achtman, R.; Gopal, Shuba; Ramos, J.; Arney, Jonathan; Krysak, Marie; Yi, Ling (2005-08)
      The Undergraduate Research Symposium was founded to honor student achievement in scientific research and to further RIT’s goal of combining traditional laboratory work and classroom instruction with experiential learning. ...

    • The rotating wind of the quasar PG 1700+518 

      Young, Stuart; Axon, David; Robinson, Andrew; Hough, James; Smith, James (Nature Publishing Group, 2008-02-27)
      It is now widely accepted that most galaxies undergo an active phase, during which a central super-massive black hole generates vast radiant luminosities through the gravitational accretion of gas1,2. Winds launched from ...

    • Seyferts on the edge: Polar scattering and orientation-dependent polarization in Seyfert 1 nuclei 

      Smith, James; Robinson, Andrew; Alexander, David; Young, Stuart; Axon, David; Corbett, Elizabeth (Blackwell Publishing: Monthly Notices of the Royal Astronomical Society, 2004-05)
      We have identified 12 Seyfert 1 galaxies that exhibit optical polarization spectra similar to those of Seyfert 2 galaxies in which polarized broad-lines are detected. We present new spectropolarimetric observations of 3 ...

    • A spectropolarimetric atlas of Seyfert 1 galaxies 

      Smith, James; Young, Stuart; Robinson, Andrew; Corbett, Elizabeth; Giannuzo, Ester; Axon, David; Hough, James (Blackwell Publishing: Monthly Notices of the Royal Astronomical Society, 2002-09-27)
      We present optical spectropolarimetry of the nuclei of 36 Seyfert 1 galaxies, obtained with the William Herschel and the Anglo–Australian Telescopes from 1996 to 1999. In 20 of these, the optical emission from the active ...