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in creator/contributor: "Cheung, C.C."  
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The Highest Redshift Relativistic Jets

Description: We describe our efforts to understand large-scale (10's-100's kpc) relativistic jet systems through observations of the highest-redshift quasars. Results from a VLA survey search for radio jets in {approx} 30 z > 3.4 quasars are described along with new Chandra observations of 4 selected targets.
Date: December 18, 2007
Creator: Cheung, C.C.; Stawarz, L.; Siemiginowska, A.; Harris, D.E; Schwartz, D.A.; Wardle, J.F.C. et al.
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Partner: UNT Libraries Government Documents Department
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First `Winged' and `X'-shaped Radio Source Candidates

Description: A small number of double-lobed radio galaxies (17 from our own census of the literature) show an additional pair of low surface brightness ''wings'', thus forming an overall ''X''-shaped appearance. The origin of the wings in these radio sources is unclear. They may be the result of back-flowing plasma from the currently active radio lobes into an asymmetric medium surrounding the active nucleus, which would make these ideal systems in which to study thermal/non-thermal plasma interactions in e… more
Date: January 22, 2007
Creator: Cheung, C.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electron Energy Distribution in Hotspots of Cygnus A:Filling the Gap with Spitzer Space Telescope

Description: Here we present Spitzer Space Telescope imaging of Cyg A with the Infrared Array Camera at 4.5 {micro}m and 8.0 {micro}m, resulting in the detection of the high-energy tails or cut-offs in the synchrotron spectra for all four hotspots of this archetype radio galaxy. When combined with the other data collected (and re-analyzed) from the literature, our observations allow for detailed modeling of the broad-band (radio-to-X-ray) emission for the brightest spots A and D. We confirm that the X-ray f… more
Date: March 6, 2007
Creator: Stawarz, L.; Cheung, C.C.; Harris, D.E. & Ostrowski, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

FIRST Winged And X-Shaped Radio Source Candidates

Description: A small number of double-lobed radio galaxies are found with an additional pair of extended low surface brightness 'wings' of emission giving them a distinctive 'X'-shaped appearance. One popular explanation for the unusual morphologies posits that the central supermassive black hole (SMBH)/accretion disk system underwent a recent realignment; in a merger scenario, the active lobes mark the post-merger axis of the resultant system (e.g., Merritt & Ekers 2002). However, this and other interpreta… more
Date: May 30, 2007
Creator: Cheung, C.C.; /KIPAC, Menlo Park; Springmann, A. & /KIPAC, Menlo Park /Wellesley Coll.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Confronting X-Ray Emission Models with theHighest-Redshift Kiloparsec-Scale Jets: The z = 3.89 Jet in Quasar 1745+624

Description: A newly identified kiloparsec-scale X-ray jet in the high-redshift z=3.89 quasar 1745+624 is studied with multi-frequency Very Large Array, Hubble Space Telescope, and Chandra X-ray imaging data. This is only the third large-scale X-ray jet beyond z > 3 known and is further distinguished as being the most luminous relativistic jet observed at any redshift, exceeding 10{sup 45} erg/s in both the radio and X-ray bands. Apart from the jet's extreme redshift, luminosity, and high inferred equipa… more
Date: June 28, 2006
Creator: Cheung, C.C.; /KIPAC, Menlo Park; Stawarz, L.; Observ., /Heidelberg; Siemiginowska, A. & Astrophys., /Harvard-Smithsonian Ctr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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