{{Short description|Galaxy in the constellation Draco}} {{Infobox galaxy | name = [[New General Catalogue|NGC]] 5982 | image = NGC 5982.png | image_size = 250px | caption =NGC 5982 by [[Hubble Space Telescope]] | credit = | epoch = [[J2000]] | type = E3<ref name="ned">{{cite web | title=NASA/IPAC Extragalactic Database | work=Results for NGC 5982 | url=http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+5982 | access-date=2016-01-18 }}</ref> | ra = {{RA|15|38|39.8}}<ref name="ned" /> | dec = {{DEC|+59|21|21}}<ref name="ned" /> | dist_ly = [[1 E24 m|123]] ± 34 [[light-year|Mly]] (37.6 ± 10.5 [[parsec|Mpc]])<ref name="ned" /> | z = 0.010064 ± 0.000031<ref name="ned" /> | h_radial_v = 3,017 ± 9 [[kilometer|km]]/[[second|s]]<ref name="ned" /> | appmag_v = 11.0<ref name=seds>{{cite web |title=Revised NGC Data for NGC 5982 |url=http://spider.seds.org/ngc/revngcic.cgi?NGC5982 |website=spider.seds.org |access-date=25 November 2018}}</ref> | size_v = 3.0{{prime}} × 2.1{{prime}}<ref name="ned" /> | constellation name = [[Draco (constellation)|Draco]] | notes = | names = [[Uppsala General Catalogue|UGC]] 9961, [[Catalogue of Galaxies and Clusters of Galaxies|CGCG]] 297-024, [[Morphological Catalogue of Galaxies|MCG]] +10-22-029, [[Principal Galaxies Catalogue|PGC]] 55674<ref name="ned" /> }} '''NGC 5982''' is an [[elliptical galaxy]] located in the constellation [[Draco (constellation)|Draco]]. It is located at a distance of about 130 million [[light year]]s from Earth, which, given its apparent dimensions, means that NGC 5982 is about 100,000 light years across. It was discovered by [[William Herschel]] on May 25, 1788.<ref name="Seligman">{{cite web |last1=Seligman |first1=Courtney |title=NGC 5982 (= PGC 55674) |url= http://cseligman.com/text/atlas/ngc59a.htm#5982 |website=Celestial Atlas |access-date=19 November 2018}}</ref>
NGC 5982 has a kinematically decoupled nucleus, with its major axis being nearly perpendicular to the rotation of the galaxy.<ref>{{cite journal |last1=Emsellem |first1=Eric |last2=Cappellari |first2=Michele |last3=Peletier |first3=Reynier F. |last4=McDermid |first4=Richard M. |last5=Bacon |first5=R. |last6=Bureau |first6=M. |last7=Copin |first7=Y. |last8=Davies |first8=Roger L. |last9=Krajnović |first9=Davor |last10=Kuntschner |first10=Harald |last11=Miller |first11=Bryan W. |last12=de Zeeuw |first12=P. Tim |title=The SAURON project – III. Integral-field absorption-line kinematics of 48 elliptical and lenticular galaxies |journal=Monthly Notices of the Royal Astronomical Society |date=11 August 2004 |volume=352 |issue=3 |pages=721–743 |doi=10.1111/j.1365-2966.2004.07948.x|doi-access=free |bibcode=2004MNRAS.352..721E |arxiv=astro-ph/0404034 |s2cid=13202056 }}</ref> NGC 5982 features many [[shell galaxy|shells]] in its envelope, nearly 26. The shells form circular arcs, with the further being located at a radius of 150 arcseconds along the major axis of the galaxy,<ref name="Burgo2007">{{cite journal |last1=del Burgo |first1=C. |last2=Carter |first2=D. |last3=Sikkema |first3=G. |title=Spatial distribution of dust in the shell elliptical NGC 5982 |journal=Astronomy & Astrophysics |date=6 November 2007 |volume=477 |issue=1 |pages=105–116 |doi=10.1051/0004-6361:20077925|doi-access=free |hdl=11370/368a09be-f392-4b31-9742-ec6defd51219 |hdl-access=free }}</ref> while the innermost one lies 8 arcseconds off the nucleus.<ref>{{cite journal |last1=Sikkema |first1=G. |last2=Carter |first2=D. |last3=Peletier |first3=R. F. |last4=Balcells |first4=M. |last5=del Burgo |first5=C. |last6=Valentijn |first6=E. A. |title=HST/ACS observations of shell galaxies: inner shells, shell colours and dust |journal=Astronomy & Astrophysics |date=26 March 2007 |volume=467 |issue=3 |pages=1011–1024 |doi=10.1051/0004-6361:20077078|bibcode=2007A&A...467.1011S |arxiv=astro-ph/0703588 |s2cid=18392338 }}</ref> The shells and the kinematically decoupled nucleus are the result of the [[galaxy merger|merger]] of the elliptical galaxy with a small elliptical galaxy.<ref name="Burgo2007"/>
The galaxy has [[globular cluster]]s that belong in two populations, red and blue. The age of the globular clusters in NGC 5982 is over 5 billion years.<ref>{{cite journal |last1=Sikkema |first1=G. |last2=Peletier |first2=R. F. |last3=Carter |first3=D. |last4=Valentijn |first4=E. A. |last5=Balcells |first5=M. |title=Globular cluster systems of six shell galaxies |journal=Astronomy & Astrophysics |date=16 October 2006 |volume=458 |issue=1 |pages=53–67 |doi=10.1051/0004-6361:20054606|bibcode=2006A&A...458...53S |arxiv=astro-ph/0606385 |s2cid=11803473 }}</ref> The luminosity of NGC 5982 is dominated by light emitted by old stars.<ref name="Burgo2007"/> In the centre of NGC 5982 lies a [[supermassive black hole]] whose mass is estimated to be {{val|8.3|e=8|ul=M_solar}} (10<sup>8.92</sup> {{solar mass}}) based on the [[M–sigma relation]].<ref>{{cite journal |last1=Stone |first1=Nicholas C. |last2=Metzger |first2=Brian D. |title=Rates of stellar tidal disruption as probes of the supermassive black hole mass function |journal=Monthly Notices of the Royal Astronomical Society |date=1 January 2016 |volume=455 |issue=1 |pages=859–883 |doi=10.1093/mnras/stv2281|doi-access=free |arxiv=1410.7772|bibcode=2016MNRAS.455..859S |s2cid=119308901 }}</ref> The nucleus may display low level activity and has been categorised as a possible [[LINER]].<ref>{{cite journal |last1=Ho |first1=Luis C. |last2=Filippenko |first2=Alexei V. |last3=Sargent |first3=Wallace L. W. |title=A Search for ''Dwarf'' Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies |journal=The Astrophysical Journal Supplement Series |date=October 1997 |volume=112 |issue=2 |pages=315–390 |doi=10.1086/313041|bibcode=1997ApJS..112..315H |arxiv=astro-ph/9704107 |s2cid=17086638 }}</ref><ref name="Burgo2007"/>
[[File:Draco-Triplet.png|thumb|left|NGC 5981 (top), NGC 5982 (middle), and NGC 5985 (bottom) form a close trio of galaxies.]] NGC 5982 belongs to a [[galaxy group]] known as the NGC 5982 group. Other members of the group include the galaxies [[NGC 5976]], [[NGC 5981]], [[NGC 5985]], [[NGC 5987]], and [[NGC 5989]].<ref name=Makarov>{{cite journal|last1=Makarov|first1=Dmitry|last2=Karachentsev|first2=Igor|title=Galaxy groups and clouds in the local (z~ 0.01) Universe|journal=Monthly Notices of the Royal Astronomical Society|date=21 April 2011|volume=412|issue=4|pages=2498–2520|doi=10.1111/j.1365-2966.2010.18071.x|doi-access=free |bibcode=2011MNRAS.412.2498M|arxiv=1011.6277|s2cid=119194025}}</ref> NGC 5981, a [[spiral galaxy]] seen edge-on, lies at a separation of 6.3 arcminutes from NGC 5982 and NGC 5985, a spiral galaxy seen face-on, lies at a separation of 7.7 arcminutes.<ref>{{cite book |author1=de Vaucouleurs, Gerard Henri |author2=de Vaucouleurs, Antoinette |author3=Shapley, Harlow |title=Reference catalogue of bright galaxies |date=1964 |publisher = University of Texas Press | location = Austin |bibcode=1964rcbg.book.....D}}</ref> The three galaxies are known as the Draco Trio or the Draco Group, although there is no evidence that they form a compact group.<ref>{{cite web |title=The Dragon Slayer - NGC 5985, NGC 5982, NGC 5981 by Ken Crawford |url=https://www.universetoday.com/17890/the-dragon-slayer-ngc-5985-ngc-5982-ngc-5981-by-ken-crawford/ |website=Universe Today |date=10 September 2008}}</ref> {{clear left}}
== References == {{reflist}}
== External links == *{{commons category-inline}} {{wikiSky}} *[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC%205982 NGC 5982 on SIMBAD]
{{Ngc60}} {{Draco (constellation)}}
{{DEFAULTSORT:NGC 5982}} [[Category:Elliptical galaxies]] [[Category:Shell galaxies]] [[Category:Draco (constellation)]] [[Category:NGC objects|5982]] [[Category:UGC objects|09961]] [[Category:Principal Galaxies Catalogue objects|55674]] [[Category:Astronomical objects discovered in 1788]] [[Category:Discoveries by William Herschel]]