مجرة حلزونية قزمة

مجرة حلزونية قزمة
شاهد أيضًا: مجرة، قائمة المجرات
تعديل مصدري - تعديل  طالع توثيق القالب

مجرة قزمة حلزونية (بالإنجليزية Dwarf spiral galaxy) وهي مجرة قزمة و نسخة مصغرة للمجرة الحلزونية حيث تتميز بوجود حوصلة مجرة بوسطها واحيانا أذرع تلتف بشكل لولبي نحو الخارج انطلاقا من الحوصلة وتتكون من عدة بلايين من النجوم بالمقارنة بالمجرات العملاقة، التي تحوي 200 إلى 400 مليار نجم هناك نوعان من المجرة القزمة الحلزونية مجرة قزمة حلزونية ويرمز لها بالرمز dSA، ومجرة قزمة حلزونية بأذرع ويرمز لها بالرمز dSB وتتميز المجرات القزمية بالمعانها المنخفض، وسطوع سطحها المنخفض وبقطر صغير (أقل من 5 كيلو فرسخ فلكي)،، وانخفاض كمية الهيدروجين[1] ويقترح أن المجرات الحلزونية القزمة يمكن أن تتحول إلى مجرات إهليلجية قزمة، ولا سيما عند تكون العناقيد الكثيفة .[2]

الموقع

وتقع معظم المجرات الحلزونية القزمة التي تم تحديها خارج العنقود المجري ومن المتوقع ان تقوم التفاعلات الجاذبية القوية بين المجرات وتفاعلات الغاز في الوسط المجري إلى تدمير أقراص معظم المجرات الحلزونية القزمة[3]

ورغم ذلك، فقد تم تحديد مجرات قزمة مع هيكل يشبه الحلزون داخل عنقود كوما المجري وعنقود العذراء المجري[4][5][6]

أمثلة

المجرة إن جي سي 5474 مجرة قزمة حلزونية
المجرة إن جي سي 5204 مجرة قزمة حلزونية

مجرات قزمة حلزونية

اقرأ أيضا

مراجع

  1. ^ J. M. Schombert؛ R. A. Pildis؛ J. A. Eder؛ A. Oelmer, Jr. (1995). "Dwarf Spirals". Astronomical Journal. ج. 110: 2067–2074. Bibcode:1995AJ....110.2067S. DOI:10.1086/117669.
  2. ^ Ben Moore؛ Neal Katz؛ George Lake؛ Alan Dressler؛ Augustus Oemler (1 فبراير 1996). "Galaxy harassment and the evolution of clusters of galaxies". Nature. ج. 379 ع. 6566: 613–616. arXiv:astro-ph/9510034. Bibcode:1996Natur.379..613M. DOI:10.1038/379613a0. مؤرشف من الأصل في 2017-11-09.
  3. ^ A. W. Graham؛ H. Jerjen؛ R. Guzmán (2003). "Hubble Space Telescope Detection of Spiral Structure in Two Coma Cluster Dwarf Galaxies". Astronomical Journal. ج. 126 ع. 4: 1787–1793. arXiv:astro-ph/0308241. Bibcode:2003AJ....126.1787G. DOI:10.1086/378166.
  4. ^ H. Jerjen؛ A. Kalnajs؛ B. Binggeli (2000). "IC3328: A "dwarf elliptical galaxy" with spiral structure". Astronomy and Astrophysics. ج. 358: 845–849. arXiv:astro-ph/0004248. Bibcode:2000A&A...358..845J.
  5. ^ F. D. Barazza؛ B. Binggeli؛ H. Jerjen (2002). "More evidence for hidden spiral and bar features in bright early-type dwarf galaxies". Astronomy and Astrophysics. ج. 391 ع. 3: 823–831. arXiv:astro-ph/0206275. Bibcode:2002A&A...391..823B. DOI:10.1051/0004-6361:20020875.
  6. ^ T. Lisker؛ E. K. Grebel؛ B. Binggeli (2006). "Virgo Cluster Early-Type Dwarf Galaxies with the Sloan Digital Sky Survey. I. On the Possible Disk Nature of Bright Early-Type Dwarfs". Astronomical Journal. ج. 132 ع. 2: 497–513. arXiv:astro-ph/0604216. Bibcode:2006AJ....132..497L. DOI:10.1086/505045.
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