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.

                              2019 November 16
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                        The Star Streams of NGC 5907
   Image Credit & [3]Copyright: [4]R Jay Gabany (Blackbird Observatory) -
             collaboration; D.Martinez-Delgado([5]IAC, [6]MPIA),
        J.Penarrubia ([7]U.Victoria) I. Trujillo ([8]IAC) S.Majewski
                   ([9]U.Virginia), M.Pohlen ([10]Cardiff)

   Explanation: Grand tidal streams of stars seem to surround galaxy
   [11]NGC 5907. The arcing structures form tenuous loops extending more
   than 150,000 light-years from the narrow, edge-on spiral, also known as
   the [12]Splinter or Knife Edge Galaxy. Recorded only in very deep
   exposures, the streams likely represent the ghostly trail of a
   [13]dwarf galaxy - debris left along the orbit of a smaller satellite
   galaxy that was [14]gradually torn apart and merged with NGC 5907 over
   four billion years ago. Ultimately this remarkable discovery image,
   from a small robotic observatory in New Mexico, supports the
   cosmological [15]scenario in which large spiral galaxies, [16]including
   our own Milky Way, were formed by the accretion of smaller ones. NGC
   5907 lies about 40 million light-years distant in the northern
   constellation [17]Draco.

                    Tomorrow's picture: WISE young stars
     __________________________________________________________________

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    Authors & editors: [29]Robert Nemiroff ([30]MTU) & [31]Jerry Bonnell
                                 ([32]UMCP)
          NASA Official: Phillip Newman [33]Specific rights apply.
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                A service of: [35]ASD at [36]NASA / [37]GSFC
                           & [38]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1911/ngc5907_gabany_rcl.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. http://www.cosmotography.com/index.html
   5. http://www.iac.es/
   6. http://www.mpia.de/Public/
   7. http://www.astro.uvic.ca/~jorpega/
   8. http://www.iac.es/
   9. http://www.astro.virginia.edu/
  10. http://www.astro.cardiff.ac.uk/
  11. http://www.cosmotography.com/images/small_ring_ngc5907.html
  12. http://www.messier.seds.org/xtra/ngc/n5907.html
  13. https://www.nasa.gov/image-feature/goddard/2016/hubble-views-a-stubborn-dwarf-galaxy
  14. https://www.cosmotography.com/images/ngc5907_animation.html
  15. http://arxiv.org/abs/0805.1137
  16. http://arxiv.org/abs/astro-ph/0703601
  17. http://hawastsoc.org/deepsky/dra/index.html
  18. https://apod.nasa.gov/apod/ap191115.html
  19. https://apod.nasa.gov/apod/archivepix.html
  20. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  21. https://apod.nasa.gov/apod/lib/aptree.html
  22. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  23. https://apod.nasa.gov/apod/calendar/allyears.html
  24. https://apod.nasa.gov/apod.rss
  25. https://apod.nasa.gov/apod/lib/edlinks.html
  26. https://apod.nasa.gov/apod/lib/about_apod.html
  27. http://asterisk.apod.com/discuss_apod.php?date=191116
  28. https://apod.nasa.gov/apod/ap191117.html
  29. http://www.phy.mtu.edu/faculty/Nemiroff.html
  30. http://www.phy.mtu.edu/
  31. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  32. http://www.astro.umd.edu/
  33. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  34. https://www.nasa.gov/about/highlights/HP_Privacy.html
  35. https://astrophysics.gsfc.nasa.gov/
  36. https://www.nasa.gov/
  37. https://www.nasa.gov/centers/goddard/
  38. http://www.mtu.edu/