243.16 - The X-ray cavity around hotspot E in Cygnus A: a bubble inflated by the outgoing jet

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Jan 8th at 9:00 AM until 10:00 AM

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Author(s): A.C. Johnson, Columbia University, New York, New York, UNITED STATES|A.C. Johnson, P. Nulsen, B. Snios, R. Kraft, Harvard Smithsonian Center for Astrophysics, Cambridge, Massachusetts, UNITED STATES|M. Wise, J.P. McKean, ASTRON (Netherlands Institute for Radio Astronomy), Dwingeloo, Massachusetts, NETHERLANDS|M. Wise, M. de Vries, Astronomical Institute “Anton Pannekoek,” University of Amsterdam, Amsterdam, Massachusetts, NETHERLANDS|M. Birkinshaw, D. worrall, A.J. Young, H. H. Wills Physics Laboratory, University of Bristol, Bristol, Massachusetts, UNITED KINGDOM|C. Carilli, R.A. Perley, National Radio Astronomy Observatory, Socorro, New Mexico, UNITED STATES|J. Croston, School of Physical Sciences, The Open University, Milton Keynes, New Mexico, UNITED KINGDOM|A. Edge, Department of Physics, University of Durham, Durham, New Mexico, UNITED KINGDOM|M. Hardcastle, School of Physics, Astronomy and Mathematics, University of Hertfordshire, Herfordshire, New Mexico, UNITED KINGDOM|R.A. Laing, Square Kilometre Array Organisation, Jodrell Bank Observatory, Macclesfield, Cheshire, New Mexico, UNITED KINGDOM|W.G. Mathews, UCO/Lick Observatory, Department of Astronomy and Astrophysics, University of California, Santa Cruz, California, UNITED STATES|D.A. Rafferty, Hamburger Sternwarte, Universität Hamburg, Hamburg, California, GERMANY|B. McNamara, Department of Physics & Astronomy, University of Waterloo, West Waterloo, Ontario, CANADA|
Institution(s): 1. Columbia University, New York, NY, United States. 2. Harvard Smithsonian Center for Astrophysics, Cambridge, MA, United States. 3. ASTRON (Netherlands Institute for Radio Astronomy), Dwingeloo, Netherlands. 4. Astronomical Institute “Anton Pannekoek,” University of Amsterdam, Amsterdam, Netherlands. 5. H. H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom. 6. National Radio Astronomy Observatory, Socorro, NM, United States. 7. School of Physical Sciences, The Open University, Milton Keynes, United Kingdom. 8. Department of Physics, University of Durham, Durham, United Kingdom. 9. School of Physics, Astronomy and Mathematics, University of Hertfordshire, Herfordshire, United Kingdom. 10. Square Kilometre Array Organisation, Jodrell Bank Observatory, Macclesfield, Cheshire, United Kingdom. 11. UCO/Lick Observatory, Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA, United States. 12. Hamburger Sternwarte, Universität Hamburg, Hamburg, Germany. 13. Department of Physics & Astronomy, University of Waterloo, West Waterloo, ON, Canada.
Contributing team(s): (none)
The powerful Fanaroff-Riley class II (FRII) radio galaxy Cygnus A (Cyg A) has a compact primary hotspot and a brighter secondary hotspot in each lobe. We report the discovery, in a 2 Msec Chandra X-ray image of Cyg A, of a "hole" surrounding the primary hotspot, with a radius of ~3 kpc, in the X-ray emission from the eastern lobe. Fitting surface brightness profiles shows that the hole must be deeper along our line of sight than its projected width. The hole appears to be inflated by the expanding jet flowing out of the primary hotspot. Brightening on its rim is interpreted as X-ray synchrotron emission from a terminal shock. X-ray emission from the primary hotspot in the west is significantly brighter than in the east and there is no evident hole. These differences are likely due to Doppler beaming. We discuss some implications for the jets and hotspots of Cyg A. The SAO REU program is funded in part by the National Science Foundation REU and Department of Defense ASSURE programs under NSF Grant no. AST-1659473, and by the Smithsonian Institution.