| 词条 | IC 4970 |
| 释义 |
| name = IC 4970 | image = IC 4970 by Hubble.jpg | image_size = 250px | caption = Lenticular galaxy IC 4970 | epoch = J2000 | constellation name = Pavo | ra = {{RA|20|16|57.35}} | dec = {{DEC|-70|44|59.1}} | z = {{val|0.015728|0.000147}} | h_radial_v = {{val|4715|44|u=km/s}} | gal_v = {{val|4603|44|u=km/s}} | dist_ly = {{convert|212|e6ly|Mpc|abbr=on|lk=on}}[6] | type = {{abbr|SA0^- pec:|early unbarred lenticular, peculiar}} | mass = | mass_light_ratio = | size = | appmag_v = {{val|13.06|0.09}} | absmag_v = {{val|-21.00|0.51}} | size_v = 0.7′× 0.2′ | notes = Interacting galaxy with {{nowrap|NGC 6872}} | names = {{nowrap| {{abbr|ESO|ESO/Uppsala Survey of the ESO(B) Atlas}} 73-33}}, {{nowrap| {{abbr|JB|Johansson+Bergvall}} a 28-2}}, {{nowrap| LEDA 64415}}, {{nowrap| {{abbr|2XMM|Second XMM-Newton X-ray source catalogue}} J201657.3-704459}} }}IC 4970 is an unbarred lenticular galaxy of type {{abbr|SA0^- pec:|early unbarred lenticular, peculiar}} in the constellation Pavo. It is {{convert|212|e6ly|Mpc|lk=on}} from Earth and is interacting with the barred spiral galaxy {{nowrap|NGC 6872}}.[6] It was discovered on 21 September 1900 by American astronomer DeLisle Stewart.[12] Interaction with NGC 6872IC 4970 is located a few arcseconds away from the much larger barred spiral galaxy NGC 6872, and the two are known to be interacting with each other. Horrelou and Koribalski (2007) reported on a computer simulation used to determine how the two galaxies were interacting. The study concluded that {{nowrap|IC 4970}} approached {{nowrap|NGC 6872}} nearly along the plane of its spiral disk, making a closest approach approximately 130 million years ago resulting in the latter's current highly elongated shape.[13] An ultraviolet-to-infrared study by Eufrasio, et al. (2013), using data from GALEX, Spitzer, and other resources found that the interaction between the two galaxies appears to have triggered significant star formation in the northeastern arm of {{nowrap|NGC 6872}} beginning about {{convert|40|kpc|e3ly|disp=flip}} from its nucleus.[14] The same appears to have also occurred in the southwestern arm.[6] A bright ultraviolet source was discovered at the end of the northeastern arm, around {{convert|90|kpc|e3ly|disp=flip}} from the nucleus, which may be a tidal dwarf galaxy formed out of the interaction between {{nowrap|IC 4970}} and {{nowrap|NGC 6872}}.[14] The bright ultraviolet nature of this cluster indicates that it contains stars less than 200 million years old, which roughly coincides with the timeframe of the collision.[6] References1. ^1 2 3 4 {{cite news |url=http://www.nasa.gov/mission_pages/galex/galex20130110.html |title=NASA's GALEX Reveals the Largest-Known Spiral Galaxy |publisher=NASA |date=10 January 2013 |accessdate=29 December 2014}} [1][2][3][4]2. ^1 {{cite web |url=http://cseligman.com/text/atlas/ic49a.htm#ic4970 |title=IC 4970 (= PGC 64415) |work=CSeligman.com |first=Courtney |last=Seligman |date=15 May 2014 |accessdate=30 December 2014}} 3. ^1 {{cite journal |title=Stars and gas in the very large interacting galaxy NGC 6872 |journal=Astronomy and Astrophysics |first1=Cathy |last1=Horellou |first2=Bärbel |last2=Koribalski |volume=464 |issue=1 |pages=155–165 |date=March 2007 |doi=10.1051/0004-6361:20066023 |bibcode=2007A&A...464..155H|arxiv = astro-ph/0701291 }} 4. ^1 2 {{cite journal |title=When the Largest Spiral is Formed |journal=Proceedings of the International Astronomical Union |first1=Rafael T. |last1=Eufrasio |first2=Duília F. |last2=de Mello |first3=Fernanda |last3=Urrutia-Viscarra |first4=Claudia |last4=Mendes de Oliveira |first5=Eli |last5=Dwek |volume=292 |page=328 |date=March 2013 |doi=10.1017/S1743921313001543 |bibcode=2013IAUS..292..328E}} }} External links{{commons category-inline|IC 4970}}
9 : Unbarred lenticular galaxies|Peculiar galaxies|Interacting galaxies|Pavo (constellation)|ESO objects|IC objects|LEDA objects|Principal Galaxies Catalogue objects|Astronomical objects discovered in 1900 |
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