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Browsing by Author "Haas, Martin"

Browsing by Author "Haas, Martin"

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  • 3C 220.3: A Radio Galaxy Lensing a Submillimeter Galaxy 
    Haas, Martin; Leipski, Christian; Barthel, Peter; Wilkes, Belinda J.; Vegetti, Simona; Bussmann, R. Shane; Willner, Steven P.; Westhues, Christian; Ashby, Matthew L. N.; Chini, Rolf; Clements, David L.; Fassnacht, Christopher D.; Horesh, Assaf; Klaas, Ulrich; Koopmans, Léon V. E.; Kuraszkiewicz, Joanna; Lagattuta, David J.; Meisenheimer, Klaus; Stern, Daniel; Wylezalek, Dominika (2014)
    Herschel Space Observatory photometry and extensive multiwavelength follow-up have revealed that the powerful radio galaxy (PRG) 3C 220.3 at z = 0.685 acts as a gravitational lens for a background submillimeter galaxy (SMG) ...
  • Chandra X-Ray Observations of the Redshift 1.53 Radio-loud Quasar 3C 270.1. 
    Wilkes, Belinda J.; Lal, Dharam V.; Worrall, D. M.; Birkinshaw, Mark; Haas, Martin; Willner, Steven P.; Antonucci, Robert; Ashby, Matthew L. N.; Avara, Mark; Barthel, Peter; Chini, Rolf; Fazio, Giovanni G.; Hardcastle, Martin J.; Lawrence, Charles; Leipski, Christian; Ogle, Patrick; Schulz, Bernhard (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, ? = 1.66 ± 0.08, typical of a radio-loud quasar, and a marginally ...
  • Clustering of red and blue galaxies around high-redshift 3C radio sources as seen by the Hubble Space Telescope 
    Ghaffari, Zohreh; Haas, Martin; Chiaberge, Marco; Willner, Steven P.; Chini, Rolf; Hildebrandt, Hendrik; de Propris, Roberto; West, Michael J. (2021)
    To properly understand the evolution of high-redshift galaxy clusters, both passive and star-forming galaxies have to be considered. Here we study the clustering environment of 21 radio galaxies and quasars at 1 1.6, red ...
  • 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 G.; Wilkes, Belinda J.; Chini, Rolf; Siebenmorgen, Ralf; Stern, Daniel (2009)
  • Disentangling the AGN and Star formation Contributions to the Radio-X-Ray Emission of Radio-loud Quasars at 1 < Z < 2 
    Azadi, Mojegan; Wilkes, Belinda; Kuraszkiewicz, Joanna; McDowell, Jonathan; Siebenmorgen, Ralf; Ashby, Matthew; Birkinshaw, Mark; Worrall, Diana; Abrams, Natasha; Barthel, Peter; Fazio, Giovanni G.; Haas, Martin; Hyman, Sóley; Martínez-Galarza, Rafael; Meyer, Eileen T. (2023)
    We constrain the emission mechanisms responsible for the prodigious electromagnetic output generated by active galactic nuclei (AGNs) and their host galaxies with a novel state-of-the-art AGN radio-to-X-ray spectral energy ...
  • Extreme Host Galaxy Growth in Powerful Early-epoch Radio Galaxies 
    Barthel, Peter; Haas, Martin; Leipski, Christian; Wilkes, Belinda J. (2012)
    During the first half of the universe&#39;s life, a heyday of star formation must have occurred because many massive galaxies are in place after that epoch in cosmic history. Our observations with the revolutionary Herschel ...
  • Near- and Mid-Infrared Photometry of High-Redshift 3CR Sources 
    Haas, Martin; Willner, Steven P.; Heymann, Frank; Ashby, Matthew L. N.; Fazio, Giovanni G.; Wilkes, Belinda J.; Chini, Rolf; Siebenmorgen, Ralf (2008)
  • Revealing the Heavily Obscured Active Galactic Nucleus Population of High-redshift 3CRR Sources with Chandra X-Ray Observations 
    Wilkes, Belinda J.; Kuraszkiewicz, Joanna; Haas, Martin; Barthel, Peter; Leipski, Christian; Willner, Steven P.; Worrall, D. M.; Birkinshaw, Mark; Antonucci, Robert; Ashby, Matthew L. N.; Chini, Rolf; Fazio, Giovanni G.; Lawrence, Charles; Ogle, Patrick; Schulz, Bernhard (2013)
    Chandra observations of a complete, flux-limited sample of 38 high-redshift (1 <SUB>R</SUB>(5 GHz) ~44-45). The quasars have high radio core fraction, high X-ray luminosities (log L <SUB>X</SUB> ~45-46), and soft X-ray ...
  • Star Formation in 3CR Radio Galaxies and Quasars at z &lt; 1 
    Westhues, Christian; Haas, Martin; Barthel, Peter; Wilkes, Belinda J.; Willner, Steven P.; Kuraszkiewicz, Joanna; Podigachoski, Pece; Leipski, Christian; Meisenheimer, Klaus; Siebenmorgen, Ralf; Chini, Rolf (2016)
    Using the Herschel Space Observatory we have observed a representative sample of 87 powerful 3CR sources at redshift z\lt 1. The far-infrared (FIR, 70-500 µm) photometry is combined with mid-infrared (MIR) photometry from ...
  • Starburst-driven Superwinds in Quasar Host Galaxies 
    Barthel, Peter; Podigachoski, Pece; Wilkes, Belinda; Haas, Martin (2017)
    During the past five decades astronomers have been puzzled by the presence of strong absorption features including metal lines, observed in the optical and ultraviolet spectra of quasars, signaling inflowing and outflowing ...
  • The Unification of Powerful Quasars and Radio Galaxies and Their Relation to Other Massive Galaxies 
    Podigachoski, Pece; Barthel, Peter; Haas, Martin; Leipski, Christian; Wilkes, Belinda J. (2015)
    The unification model for powerful radio galaxies (RGs) and radio-loud quasars postulates that these objects are intrinsically the same but viewed along different angles. Herschel Space Observatory data permit the assessment ...

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