IC 4970
{{Short description|Lenticular galaxy interacting with NGC 6872 in the constellation Pavo.}}
{{Infobox galaxy
| name = IC 4970
| image = IC 4970 by Hubble.jpg
| caption = Lenticular galaxy IC 4970
| epoch = J2000
| constellation name = Pavo
| 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}}
| 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}}
| 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}}. It was discovered on 21 September 1900 by American astronomer DeLisle Stewart.
Interaction with NGC 6872
File:An interacting colossus.jpg
IC 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.
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. The same appears to have also occurred in the southwestern arm. 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}}. 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.
References
{{reflist |refs=
{{cite web |url=http://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Obj_id&objid=56034 |title=Detailed Information for Object IC 4970 |work=NASA/IPAC Extragalactic Database |access-date=29 December 2014}}
{{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 |s2cid=16592053 }}
}}
External links
- {{commons category-inline|IC 4970}}
- {{WikiSky|IC 4970}}
- {{SIMBAD link|IC+4970|IC 4970}} at SIMBAD
{{Pavo (constellation)}}
{{DEFAULTSORT:IC 4970}}