อ้างอิง ของ ดาราจักรน้ำวน

  1. ↑ R. W. Sinnott, editor (ค.ศ. 1988). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation/Cambridge University Press. ISBN 0-933346-51-4. Check date values in: |year= (help)
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 "NASA/IPAC Extragalactic Database". Results for NGC 5194. สืบค้นเมื่อ 2006-12-06.
  3. ↑ Takáts, K.; Vinkó, J. (2006). "Distance estimate and progenitor characteristics of SN 2005cs in M51". Monthly Notices of the Royal Astronomical Society. 372 (4): 1735. arXiv:astro-ph/0608430. Bibcode:2006MNRAS.372.1735T. doi:10.1111/j.1365-2966.2006.10974.x.CS1 maint: multiple names: authors list (link)
  4. ↑ "Distance Results for MESSIER 051". NASA/IPAC Extragalactic Database. สืบค้นเมื่อ 2011-06-06.
  5. ↑ SEDS.org (M51)
  6. 1 2 H. Arp (1966). "Atlas of Peculiar Galaxies". Astrophysical Journal Supplement. 14: 1–20. doi:10.1086/190147.
  7. ↑ D. M. Elmegreen, B. G. Elmegreen (1987). "Arm classifications for spiral galaxies". Astrophysical Journal. 314: 3–9. doi:10.1086/165034.
  8. ↑ Nemiroff, Robert (2000-07-24). "Astronomy Picture of the Day". nasa.gov. สืบค้นเมื่อ 2007-04-22. Unknown parameter |coauthors= ignored (|author= suggested) (help)

แหล่งที่มา

WikiPedia: ดาราจักรน้ำวน http://www.nightskyinfo.com/archive/whirlpool_gala... http://www.dsi-astronomie.de/M51AO8.html http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?... http://nedwww.ipac.caltech.edu/cgi-bin/nDistance?n... http://adsabs.harvard.edu/abs/1966ApJS...14....1A http://adsabs.harvard.edu/abs/1987ApJ...314....3E http://www.caha.es/a-new-look-into-the-whirlpool-i... http://apod.nasa.gov/apod/ap000724.html http://antwrp.gsfc.nasa.gov/apod/ap010410.html http://ryutao.main.jp/english/st2k_m51_brc.html