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
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
- ^ David G. Turner (15 August 2013). "An Eclectic View of our Milky Way Galaxy". Canadian Journal of Physics (published September 2013). 92 (9): 959–963. arXiv:1310.0014. Bibcode:2014CaJPh..92..959T. doi:10.1139/cjp-2013-0429.
{{cite journal}}
: Unknown parameter|publicationdate=
ignored (|publication-date=
suggested) (help) - ^ "Press release: Magellanic Clouds May Be Just Passing Through". Harvard University. January 9, 2007.
- ^ Karachentsev, I. D.; Karachentseva, V. E.; Hutchmeier, W. K.; Makarov, D. I. (2004). "A Catalog of Neighboring Galaxies". The Astronomical Journal. 127 (4): 2031–2068. Bibcode:2004AJ....127.2031K. doi:10.1086/382905.
- ^ Nils Sjölander. "Milky Way Satellite Galaxies". Archived from the original on 2014-02-19.
- ^ G. Torrealba, S.E. Koposov, V. Belokurov & M. Irwin (13 April 2016). "The feeble giant. Discovery of a large and diffuse Milky Way dwarf galaxy in the constellation of Crater". Monthly Notices of the Royal Astronomical Society. 459 (3): 2370–2378. Bibcode:2016MNRAS.tmp..635T. doi:10.1093/mnras/stw733.
{{cite journal}}
: CS1 maint: bibcode (link) CS1 maint: multiple names: authors list (link) - ^ Crnojević, D.; Sand, D. J.; Zaritsky, D.; Spekkens, K.; Willman, B.; Hargis, J. R. (2016). "DEEP IMAGING OF ERIDANUS II AND ITS LONE STAR CLUSTER". The Astrophysical Journal. 824: L14. arXiv:1604.08590. Bibcode:2016ApJ...824L..14C. doi:10.3847/2041-8205/824/1/L14.
{{cite journal}}
: CS1 maint: unflagged free DOI (link) - ^ أ ب ت ث ج ح خ د ذ Sergey E. Koposov; Vasily Belokurov; Gabriel Torrealba; N. Wyn Evans (10 March 2015). "Beasts of the Southern Wild. Discovery of a large number of Ultra Faint satellites in the vicinity of the Magellanic Clouds". The Astrophysical Journal. 805 (2): 130. arXiv:1503.02079. Bibcode:2015ApJ...805..130K. doi:10.1088/0004-637X/805/2/130.
- ^ أ ب ت ث ج ح خ د DES Collaboration (10 March 2015). "Eight New Milky Way Companions Discovered in First-Year Dark Energy Survey Data". The Astrophysical Journal. 807: 50. arXiv:1503.02584. Bibcode:2015ApJ...807...50B. doi:10.1088/0004-637X/807/1/50.
- ^ أ ب ت ث ج ح خ د A. Drlica-Wagner; et al. (4 November 2015). "Eight ultra-faint galaxy candidates discovered in Year Two of the Dark Energy Survey". The Astrophysical Journal. 813 (2): 109. arXiv:1508.03622. Bibcode:2015ApJ...813..109D. doi:10.1088/0004-637X/813/2/109.
- ^ Torrealba, G.; Koposov, S.E.; Belokurov, V.; Irwin, M.; Collins, M.; Spencer, M.; Ibata, R.; Matteo, M.; Bonaca, A.; Jethwa, P. (2016). "At the survey limits: discovery of the Aquarius 2 dwarf galaxy in the VST ATLAS and the SDSS data". Monthly Notices of the Royal Astronomical Society. 463: 712–722. arXiv:1605.05338. Bibcode:2016MNRAS.463..712T. doi:10.1093/mnras/stw2051.
{{cite journal}}
: Unknown parameter|class=
ignored (help) - ^ أ ب Homma, Daisuke; Chiba, Masashi; Okamoto, Sakurako; Komiyama, Yutaka; Tanaka, Masayuki; Tanaka, Mikito; Ishigaki, Miho N.; Hayashi, Kohei; Arimoto, Nobuo (2017-04-19). "Searches for New Milky Way Satellites from the First Two Years of Data of the Subaru/Hyper Suprime-Cam Survey: Discovery of Cetus III". arXiv:1704.05977. doi:10.1093/pasj/psx050.
{{cite journal}}
: Cite journal requires|journal=
(help) - ^ Martin, Nicolas F.; et al. (Survey of the Magellanic Stellar History) (23 April 2015). "HYDRA II: A FAINT AND COMPACT MILKY WAY DWARF GALAXY FOUND IN THE SURVEY OF THE MAGELLANIC STELLAR HISTORY". The Astrophysical Journal Letters. 804 (1): L5. arXiv:1503.06216. Bibcode:2015ApJ...804L...5M. doi:10.1088/2041-8205/804/1/L5.
- ^ Kim, Dongwon; Jerjen, Helmut; Mackey, Dougal; Da Costa, Gary S.; Milone, Antonino P. (12 May 2015). "A HERO'S DARK HORSE: DISCOVERY OF AN ULTRA-FAINT MILKY WAY SATELLITE IN PEGASUS". The Astrophysical Journal Letters. 804 (2): L44. arXiv:1503.08268. Bibcode:2015ApJ...804L..44K. doi:10.1088/2041-8205/804/2/L44.
- ^ Kim, Dongwon; Jerjen, Helmut; Geha, Marla; Chiti, Anirudh; Milone, Antonino P.; Mackey, Dougal; da Costa, Gary; Frebel, Anna; Conn, Blair (2016). "PORTRAIT OF A DARK HORSE: PHOTOMETRIC PROPERTIES AND KINEMATICS OF THE ULTRA-FAINT MILKY WAY SATELLITE PEGASUS III". The Astrophysical Journal. 833: 16. arXiv:1608.04934. Bibcode:2016ApJ...833...16K. doi:10.3847/0004-637X/833/1/16.
{{cite journal}}
: Unknown parameter|class=
ignored (help)CS1 maint: unflagged free DOI (link) - ^ Dongwon Kim; Helmut Jerjen (28 July 2015). "Horologium II: A second ultra-faint Milky Way satellite in the Horologium constellation". The Astrophysical Journal Letters. 808 (2): L39. arXiv:1505.04948. Bibcode:2015ApJ...808L..39K. doi:10.1088/2041-8205/808/2/L39.
{{cite journal}}
: Unknown parameter|lastauthoramp=
ignored (|name-list-style=
suggested) (help) - ^ أ ب Laevens, B.P.M; Martin, N.F.; Bernard, E.J.; Schlafly, E.F.; Sesar, B. (1 November 2015). "SAGITTARIUS II, DRACO II AND LAEVENS 3: THREE NEW MILKY WAY SATELLITES DISCOVERED IN THE PAN-STARRS 1 3π SURVEY". The Astrophysical Journal. 813 (1): 44. arXiv:1507.07564. Bibcode:2015ApJ...813...44L. doi:10.1088/0004-637X/813/1/44.
- ^ Voggel, Karina; Hilker, Michael; Baumgardt, Holger; Collins, Michelle L.M.; Grebel, Eva K.; Husemann, Bernd; Richtler, Tom; Frank, Matthias J. (2016). "Probing the boundary between star clusters and dwarf galaxies: A MUSE view on the dynamics of Crater/Laevens I". Monthly Notices of the Royal Astronomical Society. 460 (3): 3384–3397. arXiv:1604.06806. Bibcode:2016MNRAS.460.3384V. doi:10.1093/mnras/stw1132.
{{cite journal}}
: Unknown parameter|class=
ignored (help) - ^ Benjamin P. M. Laevens; et al. (8 April 2014). "A NEW DISTANT MILKY WAY GLOBULAR CLUSTER IN THE PAN-STARRS1 3π SURVEY". The Astrophysical Journal Letters. 786 (1): L3. arXiv:1403.6593. Bibcode:2014ApJ...786L...3L. doi:10.1088/2041-8205/786/1/L3.
- ^ V. Belokurov, M. J. Irwin, S. E. Koposov, N. W. Evans, E. Gonzalez-Solares, N. Metcalfe and T. Shanks (1 July 2014). "ATLAS lifts the Cup: discovery of a new Milky Way satellite in Crater". Monthly Notices of the Royal Astronomical Society. 441 (3): 2124–2133. arXiv:1403.3406. Bibcode:2014MNRAS.441.2124B. doi:10.1093/mnras/stu626.
{{cite journal}}
: CS1 maint: multiple names: authors list (link) - ^ E. Luque; et al. (9 February 2016). "Digging deeper into Southern skies: a compact Milky Way companion discovered in first-year Dark Energy Survey data". Monthly Notices of the Royal Astronomical Society. 458 (1): 603–612. arXiv:1508.02381. Bibcode:2016MNRAS.458..603L. doi:10.1093/mnras/stw302.
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)