| 词条 | NGC 6221 |
| 释义 |
| name = NGC 6221 | image = NGC 6221 hst 05479 606.png | image_size = 250px | caption = NGC 6221 as seen through the Hubble Space Telescope | epoch = J2000 | pronounce = | constellation_name = Ara | ra = {{RA|16|52|46.1}} | dec = {{DEC|-59|13|07}} | z = {{val|0.004999|0.000017}} | h_radial_v = {{val|1499|5|u=km/s}} | gal_v = {{val|1390|7|u=km/s}} | dist_pc = | dist_ly = | group_cluster = | type = SB(s)bc | mass = | mass_light_ratio = | size = 70,000 light years | stars = | appmag_v = 9.28 | absmag_v = -21.01 | size_v = 3.50′ × 2.5′ | notes = | names = ESO 138-3, AM 1648-590, IRAS16484-5908 and PGC 59175 | references = NASA/IPAC extragalactic datatbase, http://spider.seds.org/ }}NGC 6221 (also known as PGC 59175) is a barred spiral galaxy located in the constellation Ara. It is designated as SB(s)bc in the galaxy morphological classification scheme and was discovered by British astronomer John Herschel on 3 May 1835. NGC 6221 is located at about 69 million light years from earth.[1][2][3] Galaxy group informationNGC 6221 is part of galaxy group NGC 6221/15, which includes spiral galaxy NGC 6215 and three dwarf galaxies. Interactions between NGC 6221 and NGC 6215 form a {{nowrap|double-stranded bridge}} of neutral hydrogen gas over a projected distance of 100 kpc; Dwarf 3 of the three dwarf galaxies may have formed from the bridging gas.[4] See also
References1. ^{{cite web|title=Object No. 1 - NGC 6221|url=http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+6221&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|website=NASA/IPAC extragalactic database|publisher=NASA/IPAC|accessdate=3 October 2015}} {{Catalogs|NGC=6221|PGC=59175}}{{Sky|16|52|46.1|+|-59|13|07}}{{Galaxy-stub}}2. ^{{cite web|title=Revised NGC Data for NGC 6221|url=http://spider.seds.org/ngc/revngcic.cgi?NGC6221|website=Seds|accessdate=3 October 2015}} 3. ^{{cite web|title=NGC 6221 (= PGC 59175)|url=http://cseligman.com/text/atlas/ngc62.htm#6221|website=cseligman|accessdate=3 October 2015}} 4. ^{{cite journal|title=Neutral Hydrogen Gas in Interacting Galaxies: The NGC 6221 / 6215 galaxy group|url=http://www.atnf.csiro.au/people/bkoribal/ngc6221/|journal=Monthly Notices of the Royal Astronomical Society|volume=348|issue=4|pages=1255|accessdate=17 December 2015|bibcode=2004MNRAS.348.1255K|last1=Koribalski|first1=Bärbel|last2=Dickey|first2=John M.|year=2004|doi=10.1111/j.1365-2966.2004.07444.x}} 4 : Barred spiral galaxies|Ara (constellation)|NGC objects|Principal Galaxies Catalogue objects |
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