Where Centaurus A Gets Its X-Ray Knottiness
| Autor: | Christine Jones, William E. Harris, Gregory R. Sivakoff, Daniel A. Evans, Andrés Jordán, Somak Raychaudhury, Paul Nulsen, Stephen S. Murray, Martin J. Hardcastle, Nicola Brassington, Diana M Worrall, William R. Forman, Adrienne M. Juett, Mark Birkinshaw, Judith H. Croston, Craig L. Sarazin, Kristin A. Woodley, Ralph P. Kraft |
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| Rok vydání: | 2008 |
| Předmět: |
Physics
Astrophysics::High Energy Astrophysical Phenomena Astrophysics (astro-ph) Centaurus A X-ray FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Mathematics::Geometric Topology Shear layer Transverse plane Knot (unit) Space and Planetary Science Astrophysics::Galaxy Astrophysics |
| Zdroj: | The Astrophysical Journal. 673:L135-L138 |
| ISSN: | 1538-4357 0004-637X |
| Popis: | We report an X-ray spectral study of the transverse structure of the Centaurus A jet using new data from the Chandra Cen A Very Large Project. We find that the spectrum steepens with increasing distance from the jet axis, and that this steepening can be attributed to a change in the average spectrum of the knotty emission. Such a trend is unexpected if the knots are predominantly a surface feature residing in a shear layer between faster and slower flows. We suggest that the spectral steepening of the knot emission as a function of distance from the jet axis is due to knot migration, implying a component of transverse motion of knots within the flow. Accepted for publication in ApJ (Letters) |
| Databáze: | OpenAIRE |
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