Subj : Daily APOD Report
To   : All
From : Alan Ianson
Date : Wed Sep 01 2021 00:14:54

                        Astronomy Picture of the Day

    Discover the cosmos! Each day a different image or photograph of our
      fascinating universe is featured, along with a brief explanation
                    written by a professional astronomer.

                              2021 September 1

              Dancing Ghosts: Curved Jets from Active Galaxies
      Image Credit: Jayanne English & Ray Norris, EMU-ASKAP, DES; Text:
                        Jayanne English (U. Manitoba)

   Explanation: Why would galaxies emit jets that look like ghosts? And
   furthermore, why do they appear to be dancing? The curled and fluffy
   jets from the supermassive black holes at the centers of two host
   galaxies (top center and lower left) are unlike anything seen before.
   They were found by astronomers using the Australian Square Kilometer
   Array Pathfinder (ASKAP) radio telescope when creating maps tracing the
   evolution of galaxies. Images preceding this Evolutionary Map of the
   Universe survey only showed amorphous blobs. Eventually, comparisons of
   relative amounts of energy emitted revealed the glowing elongated
   structures were created by electrons streaming around magnetic field
   lines
   . Overlaying the radio data on an optical view of the sky (Dark Energy
   Survey) confirmed that the electron streams originated from the centers
   of active galaxies. Usually such Active Galactic Nuclei (AGN) produce
   straight jets. A leading hypothesis for the geometric origin of these
   unusually graceful shapes involves the flow of large-scale
   intergalactic winds.

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