قائمة المجرات الساتلة لدرب التبانة
درب التبانة له العديد من المجرات الأصغر المربوطة به، كجزء من المجموعة الجزئية لدرب التبانة، التي هي جزء من تجمع محلي للمجرات، المجموعة المحلية.[1]
ويوجد 57 مجرة صغيرة تأكد وجودها ضمن نطاق 420 kiloparsecs (1.4 million light-years) من درب التبانة، ولكن ليس جميعهم بالضرورة في مدار، وبعضهم قد يكون في مدار حول مجرات ساتلة أخرى. الوحيدون المرئيون بالعين المجردة هم سحابتا ماجلان الكبرى والصغرى، اللتان رُصِدتا منذ قبل التاريخ. القياسات بتلسكوب هبل الفضائي في 2006 تقترح أن السحابات الماجلانية قد تكونا تتحركان بسرعة أكبر من أن تكونا تدوران في مدار حول درب التبانة.[2] ومن المجرات المؤكد وجودها في مدار، فإن أكبرهن هي مجرة القوس البيضاوية القزمة، التي يبلغ قطرها 2.6 kiloparsecs (8,500 ly)[3] أو تقريباً خـُمس قطر درب التبانة.
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السمات
القائمة
المجرات الساتلة لدرب التبانة تضم التالين:[4]
| الاسم | القطر (kpc) | المسافة (kpc) |
القدر المطلق | النمط | اكتُشِفت |
|---|---|---|---|---|---|
| سحابة ماجلان الكبرى | 4 | 48.5 | -18.1 | SBm | قبل التاريخ |
| مجرة القوس البيضاوية القزمة | 2.6 | 20 | -13.5 | E | 1994 |
| Crater II | 2.2 | 117.5 | -8.2 | dSph | 2016 [5] |
| سحابة ماجلان الصغرى | 2 | 61 | -16.8 | Irr | قبل التاريخ |
| Canes Venatici I | 2 | 220 | -8.6 | dSph | 2006 |
| Canis Major Dwarf | 1.5 | 8 | Irr | 2003 | |
| العواء 3 | 1.0 | 46 | dSph? | 2009 | |
| Sculptor Dwarf | 0.8 | 90 | -11.1 | dE3 | 1937 |
| قزم التنين | 0.7 | 80 | -8.8 | dE0 | 1954 |
| هرقل | 0.7 | 135 | -6.6 | dSph | 2006 |
| الأسد 2 | 0.7 | 210 | -9.8 | dE0 | 1950 |
| قزم الكور | 0.6 | 140 | -13.4 | dE2 | 1938 |
| Eridanus II [6] | 0.55 | 366 | -7.1 | dSph | 2015 [7][8] |
| Sextans Dwarf Spheroidal | 0.5 | 90 | -9.3 | dE3 | 1990 |
| Carina Dwarf Spheroidal | 0.5 | 100 | -9.1 | dE3 | 1977 |
| الأسد 1 | 0.5 | 250 | -12.0 | dE3 | 1950 |
| قزم الدب الأصغر | 0.4 | 60 | -8.8 | dE4 | 1954 |
| السند 2 | 0.36 | 214 | -4.3 | dSph? | 2015 [9] |
| Leo T | 0.34 | 420 | -8.0 | dSph/dIrr | 2006 |
| Aquarius II | 0.32 | 108 | -4.2 | dSph | 2016 [10] |
| العواء 1 | 0.30 | 60 | -6.3 | dSph | 2006 |
| Canes Venatici II | 0.30 | 155 | -4.9 | dSph | 2006 |
| Leo IV | 0.30 | 160 | -5.8 | dSph | 2006 |
| Tucana IV | 0.25 | 48 | -3.5 | dSph | 2015 [9] |
| Columba I | 0.21 | 182 | -4.5 | dSph | 2015 [9] |
| قزم الدب الأكبر 2 | 0.20 | 30 | dG D | 2006 | |
| Grus II | 0.19 | 53 | -3.9 | dSph | 2015 [9] |
| Cetus III | 0.18 | 251 | -2.4 | dSph? | 2017 [11] |
| Coma Berenices | 0.14 | 42 | -4.1 | dSph | 2006 |
| Hydra II | 0.14 | 128 | -4.8 | dSph | 2015 [12] |
| Reticulum III | 0.13 | 92 | -3.3 | dSph | 2015 [9] |
| Pisces II | 0.12 | 180 | -5.0 | dSph | 2010 |
| Pegasus III | 0.11 | 215 | -3.4 | dSph | 2015 [13][14] |
| العواء 2 | 0.10 | 42 | -2.7 | dSph | 2007 |
| Tucana III | 0.09 | 25 | -2.4 | dSph | 2015 [9] |
| Virgo | 0.09 | 91 | -0.3 | dSph? | 2016 [11] |
| Horologium II | 0.09 | 78 | -2.6 | dSph | 2015 [15] |
| Sagittarius II | 0.08 | 67 | -5.2 | dSph | 2015 [16] |
| Leo V | 0.08 | 180 | -5.2 | dSph | 2007 |
| Triangulum II | 0.07 | 30 | -1.8 | dSph | 2015 |
| Segue 2 | 0.07 | 35 | -2.5 | dSph | 2007 |
| Segue 1 | 0.06 | 23 | -1.5 | dSph | 2007 |
| Crater/Laevens I | 0.06 | 145 | GC[17] | 2014 [18][19] | |
| التنين 2 | 0.04 | 20 | -2.9 | dSph | 2015 [16] |
| Tucana V | 0.03 | 55 | -1.6 | dSph | 2015 [9] |
| Cetus II | 0.03 | 30 | 0.0 | dSph? | 2015 [9] |
| Reticulum II | - | 30 | -3.6 | dSph | 2015 [7][8] |
| Tucana II | - | 70 | -3.9 | dSph | 2015 [7][8] |
| Pisces I | - | 80 | dSph? | 2009 | |
| DES | - | 82 | GC | 2016 [20] | |
| Eridanus III | - | 90 | -2.4 | dSph? | 2015 [7][8] [أ] |
| Horologium I | - | 100 | -3.5 | dSph? | 2015 [7][8] [أ] |
| Kim 2/Indus I | - | 100 | GC | 2015 [7][8] | |
| Phoenix II | - | 100 | -3.7 | dSph? | 2015 [7][8] [أ] |
| Ursa Major I Dwarf | - | 100 | -5.5 | dG D | 2005 |
| Pictoris | - | 115 | -3.7 | dSph? | 2015 [7][8] [أ] |
| Grus I | - | 120 | -3.4 | dSph | 2015 [7] |
الخريطة القابلة للنقر
المجرات الساتلة لدرب التبانة (خريطة قابلة للنقر)
السيول
The Sagittarius Dwarf Spheroidal Galaxy is currently in the process of being consumed by the Milky Way and is expected to pass through it within the next 100 million years. The Sagittarius Stream is a stream of stars in polar orbit around the Milky Way leeched from the Sagittarius Dwarf. The Virgo Stellar Stream is a stream of stars that is believed to have once been an orbiting dwarf galaxy that has been completely distended by the Milky Way's gravity.
انظر أيضاً
الهامش
الهامش
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{{cite journal}}: Unknown parameter|publicationdate=ignored (|publication-date=suggested) (help) - ^ "Press release: Magellanic Clouds May Be Just Passing Through". Harvard University. January 9, 2007.
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للاستزادة
- K. Spekkens; N. Urbancic; B. S. Mason; B. Willman; J. E. Aguirre (30 September 2014). "The Dearth of Neutral Hydrogen in Galactic Dwarf Spheroidal Galaxies". The Astrophysical Journal Letters (published 13 October 2014). 795 (1): L5. arXiv:1410.0028. Bibcode:2014ApJ...795L...5S. doi:10.1088/2041-8205/795/1/L5.
{{cite journal}}: Unknown parameter|publicationdate=ignored (|publication-date=suggested) (help)
الكلمات الدالة: