Where Centaurus A gets its X-ray knottiness

Abstract

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)

References in corpus (12)

• Radio and X-ray observations of the jet in Centaurus A
• Dynamical models for jet deceleration in the radio galaxy 3C 31
• Chandra Observations of the X-ray Jet in Centaurus A
• The Discovery of Cepheids and a Distance to NGC 5128
• Chandra finds X-ray jets are common in low-power radio galaxies
• New results on particle acceleration in the Centaurus A jet and counterjet from a deep Chandra observation
• The X-ray Jet in Centaurus A: Clues on the Jet Structure and Particle Acceleration
• A relativistic model of the radio jets in NGC 315
• The inner jet of radio galaxy NGC 315 as observed with Chandra and the VLA
• Low-Mass X-ray Binaries and Globular Clusters in Centaurus A
• Observations of Magnetic Fields and Relativistic Beaming in Four Quasar Jets
• Unifying B2 radio galaxies with BL Lac objects

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