| 词条 | ESO 198-13 |
| 释义 |
| name = ESO 198-13 | image =ESO 198-13.jpg | image_size =250px | caption = Ring galaxy ESO 198-13. | epoch = J2000 | type =(R')SA(r)ab[1] | ra = {{RA|02|29|16.1}}[1] | dec = {{DEC|-48|29|29}}[1] | dist_ly = 237,147,400 ly | z = 0.018186/5452 km/s[1] | appmag_v = 13.64 | constellation name = Eridanus | size_v = 1.7' x 1.2[1] | names = PGC 9463 [1] | notes = Multiple-ringed Hoag-type galaxy |size=~162,773 ly (estimated) }}ESO 198-13 is a ring galaxy with multiple ring-like structures[2] located about 240 million light-years away[3] in the constellation Eridanus.[4] Physical CharacteristicsThis galaxy has three ring structures. There is a small bright inner ring located close to the nucleus. This feature has been interpreted as a nuclear ring due to being similar to the nuclear rings in a Barred Galaxy (e.g. NGC 1512, NGC 4314). Also this ring has a diameter of 15,527.12 light-years (4.76 kpc) which is larger than the average diameter of nuclear ring (4,893 light-years/1.5 kpc). Surrounding the nuclear ring, a flocculent inner ring with a diameter of 54,801.6 light-years (16.8 kpc) can be found. It appears to be made of a very tightly wound spiral arm. It also could be a superposition of two rings offset from each other. Outside of the flocculent inner ring, there is a very large and faint outer ring with a diameter of 162,773.8 light-years (49.9 kpc).[2] See also
References1. ^1 2 3 4 5 {{cite web | title=NASA/IPAC Extragalactic Database | work=Results for ESO 198-13 | url=http://nedwww.ipac.caltech.edu/ | accessdate=2017-07-27}} 2. ^1 {{Cite journal|last=Grouchy|first=R. D.|last2=Buta|first2=R. J|last3=Salo|first3=H.|last4=Laurikainen|first4=E.|date=3 May 2010|title=RING STAR FORMATION RATES IN BARRED AND NONBARRED GALAXIES|journal=The Astronomical Journal|volume=139|issue=6|pages=2465–2493|doi=10.1088/0004-6256/139/6/2465}} 3. ^{{Cite web|url=http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=ESO+198-13&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES|title=Your NED Search Results|website=ned.ipac.caltech.edu|access-date=2017-07-27}} 4. ^{{Cite web|url=http://cseligman.com/text/atlas/pgc09.htm|title=Principal Galaxy Catalog (PGC) Objects 9000 - 9499|website=cseligman.com|language=en-US|access-date=2017-07-27}} External links{{WikiSky}}
4 : Ring galaxies|Eridanus (constellation)|Principal Galaxies Catalogue objects|ESO objects |
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