| 词条 | NGC 4608 |
| 释义 |
| name = NGC 4608 | image = NGC 4608 SDSS.jpg | image_size = 250px | caption = SDSS image of NGC 4608. | epoch = J2000 | type = SB0^0(r) [1] | ra = {{RA|12|41|13.3}}[1] | dec = {{DEC|10|09|20}}[1] | dist_ly = 56,390,194 ly | group_cluster = Virgo Cluster | z = 0.006171/1850 km/s[1] | appmag_v = 11.97[1] | size_v = 3.2 x 2.7[1] | constellation name = Virgo | names = UGC 7842, PGC 42545, VCC 1869,[1] |size=~53,105.36 ly (estimated) }}NGC 4608 is a barred lenticular galaxy located about 56 million light-years away[2] in the constellation of Virgo. The galaxy was discovered by astronomer William Herschel on March 15, 1784.[3] It is a member of the Virgo Cluster.[4] Physical characteristicsNGC 4608 has a very well-defined bar. Surrounding the bar, there is an inner ring that is defined by a sharp inner edge. Outside of the inner ring,[5] there is a low surface brightness disk[6] that contains weak spiral features.[5] The disk in NGC 4608 is practically considered non-existent. One explanation is that the bar in the galaxy was able to form without a disk. Another explanation says that a weak bar forms initially. Over time, the bar grows by causing the external disk to lose angular momentum therefore funneling material toward the bulge. Then the bar would be surrounded by a halo with very little or no disk left.[6] See also
References1. ^1 2 3 4 5 6 {{cite web | title=NASA/IPAC Extragalactic Database | work=Results for NGC 4608 | url=http://nedwww.ipac.caltech.edu/ | accessdate=2017-09-04}} 2. ^{{Cite web|url=https://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+4608&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=2017-09-04}} 3. ^{{Cite web|url=http://cseligman.com/text/atlas/ngc46.htm#4608|title=New General Catalog Objects: NGC 4600 - 4649|last=|first=|date=|website=cseligman.com|language=en-US|archive-url=|archive-date=|dead-url=|access-date=2017-09-03}} 4. ^{{Cite web|url=https://ned.ipac.caltech.edu/cgi-bin/NEDatt?objname=NGC+4608|title=Detailed Object Classifications|website=ned.ipac.caltech.edu|access-date=2017-09-04}} 5. ^1 {{Cite web|url=http://kudzu.astr.ua.edu/devatlas/NGC_4608______B___________.html|title=NGC 4608 - SB(r)0/a|last=|first=|date=|website=The de Vaucouleurs Atlas of Galaxies|archive-url=|archive-date=|dead-url=|access-date=2017-09-04}} 6. ^1 {{Cite journal|last=Gadotti|first=D. A.|last2=de Souza|first2=R. E.|date=8 January 2003|title=NGC 4608 AND NGC 5701: BARRED GALAXIES WITHOUT DISKS?|journal=The Astrophysical Journal|volume=583|issue=2|pages=L75–L78|arxiv=astro-ph/0301072|bibcode=2003ApJ...583L..75G|doi=10.1086/368159}} External links{{WikiSky}}{{Ngc50}} 7 : Barred lenticular galaxies|Virgo (constellation)|NGC objects|Principal Galaxies Catalogue objects|UGC objects|Astronomical objects discovered in 1784|Virgo Cluster |
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