| 词条 | NGC 1084 |
| 释义 |
| name = NGC 1084 | image = A spiral home to exploding stars.jpg | image_size = 280px | caption = NGC 1084 by the Hubble Space Telescope | credit = NASA/STScI/WikiSky | epoch = J2000 | type = SA(s)c [1] | ra = {{RA|02|45|59.9}}[1] | dec = {{DEC|-07|34|42}}[1] | dist_ly = 66.8 ± 12.8 Mly (20.51 ± 3.93 Mpc)[1] | z = 1407 ± 4 km/s[1] | appmag_v = 10.7 | size_v = 3′.2 × 1′.8[1] | constellation name = Eridanus | notes = | names = PGC 10464[1] }}NGC 1084 is an unbarred spiral galaxy in constellation Eridanus. It is at a distance of about 65 million light-years away from Earth. It was discovered by William Herschel on 10 January 1785. The galaxy has multiple spiral arms, which are not well defined.[2] It belongs in the same group with NGC 988, NGC 991, NGC 1022, NGC 1035, NGC 1042, NGC 1047, NGC 1052 and NGC 1110. The group is associated with Messier 77 group.[3] NGC 1084 has been home of 5 supernovae in the last 50 years, 1963P (mag. 14), 1996an (type II, mag. 14), 1998dl (type II, mag. 16), 2009H (type II, mag. 17), and 2012ec (type IIP, mag. 14,5).[4][5] Star formation in the galaxy is chaotic and not confined at the spiral arms of the galaxy, however, not as high as to classify the galaxy as a starburst galaxy. Star formation has taken place in small bursts in the last 40 million years. The reason of this activity has been proposed to be a merger with a gas-rich dwarf galaxy. A radio source has been detacted 3,5' south-west of the galaxy, connected to it by a bridge.[6] References1. ^1 2 3 4 5 6 {{cite web | title=NASA/IPAC Extragalactic Database | work=Results for NGC 1084 | url=http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+1084 | accessdate=2016-01-02 }} 2. ^{{cite journal|title=Near-Infrared and Optical Morphology of Spiral Galaxies|journal=The Astrophysical Journal Supplement Series|date=November 2002|volume=143|issue=1|pages=73–111|doi=10.1086/342340|arxiv = astro-ph/0206320 |bibcode = 2002ApJS..143...73E |last1=Eskridge|first1=Paul B.|last2=Frogel|first2=Jay A.|last3=Pogge|first3=Richard W.|last4=Quillen|first4=Alice C.|last5=Berlind|first5=Andreas A.|last6=Davies|first6=Roger L.|last7=Depoy|first7=D. L.|last8=Gilbert|first8=Karoline M.|last9=Houdashelt|first9=Mark L.|last10=Kuchinski|first10=Leslie E.|last11=Ramirez|first11=Solange V.|last12=Sellgren|first12=K.|last13=Stutz|first13=Amelia|last14=Terndrup|first14=Donald M.|last15=Tiede|first15=Glenn P.}} 3. ^{{cite journal|last1=Dmitry Makarov and Igor Karachentsev|title=Galaxy groups and clouds in the local (z∼ 0.01) Universe|journal=MNRAS|date=2011|volume=412|issue=4|pages=2498–2520|doi=10.1111/j.1365-2966.2010.18071.x|url=http://www.sao.ru/hq/dim/groups/galaxies.dat|accessdate=1 January 2016|arxiv = 1011.6277 |bibcode = 2011MNRAS.412.2498M }} 4. ^List of Supernovae IAU Central Bureau for Astronomical Telegrams. Retrieved 29 December 2015. 5. ^[https://www.spacetelescope.org/images/potw1413a/ A spiral home to exploding stars] (31 March 2014) Hubble Space Telescope 6. ^{{cite journal|author1=S. Ramya |author2=D. K. Sahu |author3=T. P. Prabhu |last-author-amp=yes |title=Study of star formation in NGC 1084|journal=MNRAS|date=October 2007|volume=381|issue=2|pages=511–524|doi=10.1111/j.1365-2966.2007.12232.x|url=http://mnras.oxfordjournals.org/content/381/2/511.full|accessdate=2 January 2016|arxiv = 0707.2366 |bibcode = 2007MNRAS.381..511R }} External links{{wikiSky}} 4 : Eridanus (constellation)|Unbarred spiral galaxies|NGC objects|Principal Galaxies Catalogue objects |
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