| 词条 | NGC 2997 |
| 释义 |
| name = NGC 2997 | image = NGC 2997 ESO.jpg | image_size = 300px | caption = NGC 2997 | epoch = J2000 | type = SA(s)c[1] | ra = {{RA|09|45|38.8}}[1] | dec = {{DEC|-31|11|28}}[1] | dist_ly = 39.8 Mly[2] | Recession velocity = 1088 ± 2 km/s[1] | appmag_v = 10.1[1] | size_v = 8′.9 × 6′.8[1] | constellation name = Antlia | names = ESO 434- G 35,[1] PGC 27978[1] }} NGC 2997 is a face-on unbarred spiral galaxy about 25 million light-years away in the constellation Antlia.[2] It is the brightest galaxy of the NGC 2997 group of galaxies. NGC 2997 is particularly notable for a nucleus surrounded by a chain of hot giant clouds of ionized hydrogen. It is featured on the cover of the first edition of Galactic Dynamics by James Binney and Scott Tremaine.[3] Other resourcesSee also
External links
References1. ^1 2 3 4 5 6 7 {{cite web | title=NASA/IPAC Extragalactic Database | work=Results for NGC 2997 | url=http://nedwww.ipac.caltech.edu/ | accessdate=2006-11-25 }} {{Sky|09|45|38.8|-|31|11|28|24800000}}{{Stars of Antlia}}{{Ngc30}}{{galaxy-stub}}2. ^1 {{cite journal | title=Anomalous HI in NGC 2997 | journal=The Astrophysical Journal | volume=699 | issue=1 | pages=76–88 | author=Hess K. M. | author2=Pisano D. J. | author3=Wilcots E. M. | author4= Chengular J. N. | arxiv=0904.3494v1 | doi=10.1088/0004-637X/699/1/76 | year=2009 | bibcode=2009ApJ...699...76H }} 3. ^{{cite web|url = http://press.princeton.edu/titles/2537.html|title = Binney, J. and Tremaine, S.: Galactic Dynamics.|publisher = Princeton University Press|accessdate = 2007-04-09|deadurl = yes|archiveurl = https://web.archive.org/web/20070420125120/http://press.princeton.edu/titles/2537.html|archivedate = 2007-04-20|df = }} 5 : Unbarred spiral galaxies|Antlia|NGC objects|Principal Galaxies Catalogue objects|ESO objects |
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