CHANDRA OBSERVATIONS OF THE COLLISIONAL RING GALAXY NGC 922
作者： A. H. Prestwich , J. L. Galache , T. Linden , V. Kalogera , A. Zezas
DOI: 10.1088/0004-637X/747/2/150
关键词: Population 、 Stellar evolution 、 Hubble sequence 、 Star formation 、 Astrophysics 、 Galaxy 、 Extragalactic astronomy 、 Ring galaxy 、 Metallicity 、 Astronomy 、 Physics
摘要: In this paper, we report on Chandra observations of the starburst galaxy NGC 922. 922 is a drop-through ring with an expanding star formation, similar in many respects to Cartwheel galaxy. The famous for hosting 12 ultraluminous X-ray sources (ULXs), most which are star-forming ring. This largest number ULXs seen single system and has led speculation that low metallicity (0.3 Z ☉) may optimize conditions ULX formation. contrast, near solar. reveal population bright sources, including seven ULXs. scales formation rate: do not find any evidence excess Cartwheel. Simulations binary these galaxies suggest both systems dominated by strong wind accretion from supergiant donors onto direct-collapse black holes. simulations correctly predict ratio Thus, it would appear enough see difference compared
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