List of stellar streams

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Stellar streams in the Milky Way, discovered in 2007

This is a list of stellar streams. A stellar stream is an association of stars orbiting a galaxy that was once a globular cluster or dwarf galaxy that has now been torn apart and stretched out along its orbit by tidal forces. An exoplanet was reportedly found orbiting a star HIP 13044 in the Helmi stream, however that claim has been found not to be accurate.

Local Group streams[edit]

Milky Way Galaxy streams[edit]

Known streams in the Milky Way[1]
Name Origin Mass
(Solar masses)
Length
(light years)
Composition Discovery year
Arcturus stream Defunct dwarf galaxy Unknown Unknown Old stars deficient in heavy elements 1971[2]
Cetus Polar Stream Defunct dwarf galaxy Unknown Unknown Old stars 2009 [3]
Magellanic Stream Large and Small Magellanic Clouds 200 million 1 million Hydrogen gas 1972
Sagittarius Stream Sagittarius Dwarf Elliptical Galaxy 100 million 1 million Wide variety of stars 1994
Helmi stream Defunct dwarf galaxy 10 to 100 million Several complete loops around the Milky Way Old stars deficient in heavy elements 1999
Palomar 5 stream Globular cluster Palomar 5 5,000 30,000 Old stars 2001
Virgo stream Defunct dwarf galaxy 30,000 2001
Monoceros ring Canis Major dwarf galaxy 100 million 200,000 Intermediate-age stars 2002
Anticenter stream Defunct dwarf galaxy Unknown 30,000 Old stars 2006
NGC 5466 stream

45 Degree Tidal Stream

Globular cluster NGC 5466 10,000 60,000 Very old stars 2006[4]
Orphan stream Unknown (hence its name) Unknown [5] 20,000 Old stars 2006
Acheron stream Globular cluster 2007[4][6]
Cocytus stream Globular cluster 2007[4][6]
Lethe stream Globular cluster 2007[6]
Styx stream Defunct dwarf galaxy (Possibly Boötes III (dwarf galaxy)) 2007[4][6]
Bootes III stream Embedded in, & possible progenitor of Styx stream 2007[4][6]
Aquarius Stream Defunct dwarf galaxy Unknown 30,000 Old stars 2010

Andromeda Galaxy streams[edit]

Known streams in the Andromeda Galaxy
Name Origin Mass
(Solar masses)
Length
(light years)
Composition Discovery year
M31 Giant
stellar stream
Andromeda NE
stellar stream[7]
2004
Tidal Stream Northwest (Tidal Stream E and F)[8] 2009
Tidal Stream Southwest[8] 2009

Streams beyond the Local Group[edit]

Other known streams outside the Local Group
Name Location Origin Mass
(Solar masses)
Length
(light years)
Composition Characteristics Discovery year
Young Blue Tidal Stream[9] NGC 5128 A gas fragment or
a dwarf galaxy
2002
NGC 4013[10] former dwarf satellite
with low inclination orbit
large looping structure 2008
NGC 5907[11] low-mass satellite accretion multiple surrounding loops 2009
NGC 4651[12] satellite accretion narrow jet-like structure and surrounding debris shell 2010
NGC 1055[12] satellite accretion box shaped halo pierced by multiple spikes 2010
NGC 3521[12] satellite accretion jet-like structure and surrounding debris shell 2010
NGC 7531[12] satellite accretion surrounding debris shell 2010
NGC 1084[12] satellite accretion three giant disconnected plumes of similar width 2010
NGC 4216[12] satellite accretion ongoing tidal disruption of satellite galaxies
seen as long tails extending from the progenitor satellite
2010
NGC 1055[12] satellite accretion clear box shaped inner halo sprinkled with a plethora of coherent spikes 2010

References[edit]

  1. ^ Ibata, Rodrigo; Gibson, Brad (April 2007). "The Ghosts of Galaxies Past". Scientific American 296 (4): 40–45. doi:10.1038/scientificamerican0407-40. PMID 17479629. 
  2. ^ Ibata, Rodrigo; Gibson, Brad (April 2007). "The Ghosts of Galaxies Past". Scientific American 296 (4): 40–45. doi:10.1038/scientificamerican0407-40. PMID 17479629. 
  3. ^ "Discovery of a New, Polar-Orbiting Debris Stream in the Milky Way Stellar Halo". The Astrophysical Journal, Volume 700, Issue 2. July 2009. Retrieved 2014-03-23. 
  4. ^ a b c d e "Rings around the galaxy". Astronomy. June 1, 2007. Retrieved 2007-06-07. 
  5. ^ "The Orbit of the Orphan Stream". The Astrophysical Journal, Volume 711, Issue 1, pp. 32-49. January 2010. Retrieved 2014-03-23. 
  6. ^ a b c d e "Four New Stellar Debris Streams in the Galactic Halo". The Astrophysical Journal, Volume 693, Issue 2, pp. 1118-1127. March 2009. Retrieved 2010-04-20. 
  7. ^ A New Giant Stellar Structure in the Outer Halo of M31, by Zucker + 19 more, 8 Jan 2004 (retrieved on 15 Apr 2008)
  8. ^ a b New tidal streams found in Andromeda reveal history of galactic mergers
  9. ^ A Young Blue Tidal Stream in NGC 5128, Peng, Ford, Freeman, White, 22 Aug 2002, (retrieved in 15 Apr 2009)
  10. ^ Discovery of a Giant Stellar Tidal Stream Around the Disk Galaxy NGC 4013, D Martinez-Delgado, M Pohlen, R. Jay Gabany, S. R. Majewski, J Penarrubia, C Palma , 24 Oct 2008
  11. ^ Fossils of the Hierarchical formation of the Nearby Spiral Galaxy NGC 5907, D Martinez-Delgado, J Penarrubia , R. Jay Gabany, I Trujillo, S. R. Majewski, M Pohlen, 13 Aug 2009
  12. ^ a b c d e f g Stellar Tidal Streams in Spiral Galaxies of the Local Volume: A Pilot Survey with Modest Aperture Telescopes, D Martinez-Delgado, R. J. GaBany, K Crawford, S Zibbeti, S. R. Majewski, H Rix, J Fliri, J Carballo-Bello, D. C. Bardalez-Gagliuffi, J Penarrubia, T. R. Chonis, I Trujillo, M Schirmer, D. A. McDavid, 25 March 2010

External links[edit]

See also[edit]