NGC 4945

NGC 4945
ラ・シヤ天文台の2.2mMPG/ESO望遠鏡で撮影したNGC 4945
ラ・シヤ天文台の2.2mMPG/ESO望遠鏡で撮影したNGC 4945
星座 ケンタウルス座
見かけの等級 (mv) 9.3[1]
視直径 20.0′ × 3.8′[1]
分類 SB(s)cd[1]
位置
元期:J2000.0
赤経 (RA, α)  13h 05m 27.477s[1]
赤緯 (Dec, δ) −49° 28′ 05.57″[1]
赤方偏移 0.001878±0.000010[1]
距離 3.946 ± 0.604 Mpc (12.87 ± 1.97 Mly)[1]
他のカタログでの名称
PGC 45279,[1], Caldwell 83
Template (ノート 解説) ■Project

NGC 4945Caldwell 83)は、ケンタウルス座にある棒渦巻銀河である。1826年にジェームズ・ダンロップによって発見された[2]。X線観測によると、大きなブラックホールを含む異常にエネルギーの高いセイファート核を持っていることが示されるが、NGC 4945は銀河系とよく似ていると考えられている。

銀河群

NGC 4945は、近隣の銀河群であるケンタウルス座A/M83銀河群で最も明るい銀河の1つである。また、ケンタウルス座Aを中心としたサブグループの中で2番目に明るい[3][4]

出典

  1. ^ a b c d e f g h NASA/IPAC Extragalactic Database”. Results for NGC 4945. 2016年9月16日閲覧。
  2. ^ Milky Way's Not-So-Distant Cousin Likely Harbors Supermassive Black Hole”. Science Daily. 2013年5月30日閲覧。
  3. ^ I. D. Karachentsev, M. E. Sharina, A. E. Dolphin, E. K. Grebel, D. Geisler, P. Guhathakurta, P. W. Hodge, V. E. Karachentseva, A. Sarajedini, P. Seitzer (2002). “New distances to galaxies in the Centaurus A group”. Astronomy and Astrophysics 385 (1): 21–31. Bibcode2002A&A...385...21K. doi:10.1051/0004-6361:20020042. 
  4. ^ I. D. Karachentsev (2005). “The Local Group and Other Neighboring Galaxy Groups”. Astronomical Journal 129 (1): 178–188. arXiv:astro-ph/0410065. Bibcode2005AJ....129..178K. doi:10.1086/426368. 

外部リンク

座標: 星図 13h 05m 27.5s, −49° 28′ 06″

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