Astronomy Picture of the Day

   [1]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 August 4
    [2]The picture shows a zoom into the central jet of active galaxy Cen
        A. Please see the explanation for more detailed information.

              EHT Resolves Central Jet from Black Hole in Cen A
   Image Credit: Radboud University; CSIRO/ATNF/I.Feain et al., R.Morganti
      et al., N.Junkes et al.; ESO/WFI; MPIfR/ESO/APEX/A. Weiss et al.;
   NASA/CXC/CfA/R. Kraft et al.; TANAMI/C. Mueller et al.; EHT/M. Janssen
                                   et al.

   Explanation: How do supermassive black holes create powerful jets? To
   help find out, the [3]Event Horizon Telescope (EHT) imaged the center
   of the nearby [4]active galaxy [5]Centaurus A. The cascade of
   [6]featured inset images shows Cen A from it largest, taking up [7]more
   sky than many moons, to its now finest, taking up only as much sky as
   an [8]golf ball on the moon. The new image shows what may look like two
   jets -- but is actually two sides of a [9]single jet. This [10]newly
   discovered jet-edge brightening does not solve the [11]jet-creation
   mystery, but does imply that the particle outflow is confined by a
   strong pressure -- possibly involving a [12]magnetic field. [13]The EHT
   is a coordination of radio telescopes from around [14]the Earth -- from
   the [15]Caltech Submillimeter Observatory in [16]Hawaii USA, to
   [17]ALMA in [18]Chile, to [19]NOEMA in [20]France, and [21]more. The
   EHT will continue to observe massive, nearby [22]black [23]holes and
   their energetic surroundings.

                  Tomorrow's picture: Space Odyssey craters
     __________________________________________________________________

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    Authors & editors: [35]Robert Nemiroff ([36]MTU) & [37]Jerry Bonnell
                                 ([38]UMCP)
          NASA Official: Phillip Newman [39]Specific rights apply.
              [40]NASA Web Privacy Policy and Important Notices
                A service of: [41]ASD at [42]NASA / [43]GSFC
                           & [44]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2108/CenAjets_Eht_3001.jpg
   3. https://eventhorizontelescope.org/about
   4. https://imagine.gsfc.nasa.gov/science/objects/active_galaxies1.html
   5. https://apod.nasa.gov/apod/ap151119.html
   6. https://www.almaobservatory.org/en/press-releases/eht-pinpoints-dark-heart-of-the-nearest-radio-galaxy/
   7. https://www.geogebra.org/m/uyfqbyba
   8. https://www.golfspan.com/how-many-golf-balls-on-the-moon
   9. https://apod.nasa.gov/apod/ap210117.html
  10. https://www.nature.com/articles/s41550-021-01417-w
  11. https://i.redd.it/2vj4png9nm951.jpg
  12. https://apod.nasa.gov/apod/ap210421.html
  13. https://en.wikipedia.org/wiki/Event_Horizon_Telescope
  14. https://solarsystem.nasa.gov/planets/earth/in-depth/
  15. http://cso.caltech.edu/
  16. https://en.wikipedia.org/wiki/Hawaii
  17. https://apod.nasa.gov/apod/ap140526.html
  18. https://en.wikipedia.org/wiki/Chile
  19. https://youtu.be/EhhcmN28XbM
  20. https://en.wikipedia.org/wiki/France
  21. https://eventhorizontelescope.org/array
  22. https://apod.nasa.gov/apod/ap190411.html
  23. https://apod.nasa.gov/apod/ap210331.html
  24. https://apod.nasa.gov/apod/ap210803.html
  25. https://apod.nasa.gov/apod/archivepix.html
  26. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  27. https://apod.nasa.gov/apod/lib/aptree.html
  28. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  29. https://apod.nasa.gov/apod/calendar/allyears.html
  30. https://apod.nasa.gov/apod.rss
  31. https://apod.nasa.gov/apod/lib/edlinks.html
  32. https://apod.nasa.gov/apod/lib/about_apod.html
  33. http://asterisk.apod.com/discuss_apod.php?date=210804
  34. https://apod.nasa.gov/apod/ap210805.html
  35. http://www.phy.mtu.edu/faculty/Nemiroff.html
  36. http://www.phy.mtu.edu/
  37. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  38. http://www.astro.umd.edu/
  39. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  40. https://www.nasa.gov/about/highlights/HP_Privacy.html
  41. https://astrophysics.gsfc.nasa.gov/
  42. https://www.nasa.gov/
  43. https://www.nasa.gov/centers/goddard/
  44. http://www.mtu.edu/