Browsing by Author "Fazio, Giovanni"

Now showing items 1-9 of 9

    • Chandra X-Ray Observations of the Redshift 1.53 Radio-Loud Quasar 3c 270.1 

      Wilkes, Belinda Jane; Lal, Dharam V.; Worrall, Diana M.; Birkinshaw, Mark; Haas, Martin; Willner, Steven P.; Antonucci, Robert; Ashby, Matthew L N; Avara, Mark; Barthel, Peter; Chini, Rolf; Fazio, Giovanni Gene; Hardcastle, Martin; Lawrence, Charles; Leipski, Christian; Ogle, Patrick; Schulz, Bernhard (IOP Publishing, 2012)
      Chandra X-ray observations of the high redshift (z = 1.532) radio-loud quasar 3C 270.1 in 2008 February show the nucleus to have a power-law spectrum, Γ = 1.66 ± 0.08, typical of a radio-loud quasar, and a marginally ...

    • Clustering of Red Galaxies around the Z = 1.53 Quasar 3C 270.1 

      Haas, Martin; Willner, Steven P.; Heymann, Frank; Ashby, Matthew L N; Fazio, Giovanni Gene; Wilkes, Belinda Jane; Chini, Rolf; Siebenmorgen, Ralf; Stern, Daniel (IOP Publishing, 2009)
      In the paradigm of hierarchical galaxy formation, luminous radio galaxies mark mass assembly peaks that should contain clusters of galaxies. Observations of the z = 1.53 quasar 3C 270.1 with the Spitzer Space Telescope at ...

    • Mid-Infrared Spectroscopy of High-Redshift 3crr Sources 

      Leipski, C.; Haas, Mary Elizabeth; Willner, Steven P.; Ashby, Matthew L N; Wilkes, Belinda Jane; Fazio, Giovanni Gene; Antonucci, R.; Barthel, P.; Chini, R.; Siebenmorgen, R.; Ogle, P.; Heymann, F. (IOP Publishing, 2010)
      Using the Spitzer Space Telescope, we have obtained rest-frame 9–16 μm spectra of 11 quasars and 9 radio galaxies from the 3CRR catalog at redshifts 1.0 <z< 1.4. This complete flux-limited 178 MHz selected sample is unbiased ...

    • Mid-Infrared-Selected Quasars. I. Virial Black Hole Mass and Eddington Ratios 

      Dai, Y. Sophia; Elvis, Martin S.; Bergeron, Jacqueline; Fazio, Giovanni Gene; Huang, Jia-Sheng; Wilkes, Belinda Jane; Willmer, Christopher N. A.; Omont, Alain; Papovich, Casey (IOP Publishing, 2014)
      We provide a catalog of 391 mid-infrared-selected (MIR; 24 μm) broad-emission-line (BEL; type 1) quasars in the 22 deg2 SWIRE Lockman Hole field. This quasar sample is selected in the MIR from Spitzer MIPS with S 24 > 400 ...

    • Near‐ and Mid‐Infrared Photometry of High‐Redshift 3CR Sources 

      Haas, Martin; Willner, Steven P.; Heymann, Frank; Ashby, Matthew L N; Fazio, Giovanni Gene; Wilkes, Belinda Jane; Chini, Rolf; Siebenmorgen, Ralf (IOP Publishing, 2008)
      Using the Spitzer Space Telescope, we have obtained 3.6-24 μm photometry of 38 radio galaxies and 24 quasars from the 3CR (Third Cambridge Revised Catalog of Radio Sources) at redshift 1 < z < 2.5. This 178 MHz selected ...

    • Revealing the Heavily Obscured Active Galactic Nucleus Population of High-Redshift 3crr Sources With Chandra X-Ray Observations 

      Wilkes, Belinda Jane; Kuraszkiewicz, Joanna; Haas, Martin; Barthel, Peter; Leipski, Christian; Willner, Steven P.; Worrall, Diana M.; Birkinshaw, Mark; Antonucci, Robert; Ashby, Matthew L N; Chini, Rolf; Fazio, Giovanni Gene; Lawrence, Charles; Ogle, Patrick; Schulz, Bernhard (IOP Publishing, 2013)
      Chandra observations of a complete, flux-limited sample of 38 high-redshift (1 <z< 2), low-frequency-selected (and so unbiased in orientation) 3CRR radio sources are reported. The sample includes 21 quasars (=broad-line ...

    • Simulated Galaxy Interactions as Probes of Merger Spectral Energy Distributions 

      Lanz, Lauranne; Hayward, Christopher C.; Zezas, Andreas; Smith, Howard A.; Ashby, Matthew L N; Brassington, Nicola; Fazio, Giovanni Gene; Hernquist, Lars Eric (IOP Publishing, 2014)
      We present the first systematic comparison of ultraviolet-millimeter spectral energy distributions (SEDs) of observed and simulated interacting galaxies. Our sample is drawn from the Spitzer Interacting Galaxy Survey and ...

    • Star formation in z > 1 3CR host galaxies as seen by Herschel 

      Podigachoski, P.; Barthel, P. D.; Haas, Mary Elizabeth; Leipski, C.; Wilkes, Belinda Jane; Kuraszkiewicz, Joanna; Westhues, C.; Willner, Steven P.; Ashby, Matthew L N; Chini, R.; Clements, D. L.; Fazio, Giovanni Gene; Labiano, A.; Lawrence, C.; Meisenheimer, K.; Peletier, R. F.; Siebenmorgen, R.; Verdoes Kleijn, G. (EDP Sciences, 2015)
      We present Herschel (PACS and SPIRE) far-infrared (FIR) photometry of a complete sample of z> 1 3CR sources, from the Herschel guaranteed time project The Herschel Legacy of distant radio-loud AGN. Combining these with ...

    • The total infrared luminosity may significantly overestimate the star formation rate of quenching and recently quenched galaxies 

      Hayward, C. C.; Lanz, L.; Ashby, Matthew L N; Fazio, Giovanni Gene; Hernquist, Lars Eric; Martinez-Galarza, J. R.; Noeske, K.; Smith, Howard A.; Wuyts, S.; Zezas, Andreas (Oxford University Press (OUP), 2014)
      The total infrared (IR) luminosity is very useful for estimating the star formation rate (SFR) of galaxies, but converting the IR luminosity into an SFR relies on assumptions that do not hold for all galaxies. We test the ...