| 词条 | Triangulum II |
| 释义 |
| image = | caption = | name = Triangulum II | epoch = J2000 | type = | ra = {{RA|02|13|17.4}}[1] | dec = +{{DEC|36|10|42.4}}[1] | dist_ly = {{convert|30|+/-|2|kpc|kly|abbr=on|lk=on|disp=flip}}[1] | z = | mass_light_ratio = 3600 (V)[1] | appmag_v = | size_v = 3.9′[1] | age= 13 Ga | constellation name = Triangulum | names = Triangulum II, Tri II, Laevens 2, Lae 2 }}Triangulum II (Tri II or Laevens 2) is a dwarf galaxy close to the Milky Way Galaxy. It contains only 1000 stars, yet is quite massive, having a solar mass to light ratio of 3600.[6] This is an unusually high mass for such a small galaxy.[1] The distance from the centre of the Milky Way is {{convert|26|kpc|kly|abbr=on}}. The luminosity is 450 times that of the Sun.[2] This makes it one of the dimmest known galaxies.[2] The 2D half light radius is {{convert|34|pc|ly|abbr=on}}. The galaxy was discovered in images taken by Pan-STARRS by Benjamin P. M. Laevens in 2015.[3][2] Triangulum II is a candidate for detecting WIMPs as a source of dark matter.[1] References1. ^1 {{cite web |last1=Dajose|first1=Lori |title= Dark matter dominates in nearby dwarf galaxy |url= http://phys.org/news/2015-11-dark-dominates-nearby-dwarf-galaxy.html |accessdate= 19 November 2015 |date= 18 November 2015 |publisher= Phys.org }}; {{cite web| publisher=Caltech | title=Dark Matter Dominates in Nearby Dwarf Galaxy | author=Lori Dajose | date=November 18, 2015 | access-date=December 16, 2015 | url=http://www.caltech.edu/news/dark-matter-dominates-nearby-dwarf-galaxy-48790}} {{Milky Way}}2. ^1 2 3 {{cite journal |last1=Kirby|first1=Evan N.|last2=Cohen|first2=Judith G.|author-link2=Judith Gamora Cohen|last3=Simon|first3=Joshua D.|last4=Guhathakurta|first4=Puragra|title= Triangulum II: Possibly a Very Dense Ultra-Faint Dwarf Galaxy |journal= The Astrophysical Journal |date= 16 November 2015 |volume= 814 |issue= 1 |pages= L7 |doi= 10.1088/2041-8205/814/1/L7 |bibcode= 2015ApJ...814L...7K |arxiv= 1510.03856 }} 3. ^1 2 3 4 5 {{cite journal |last1=Laevens|first1=Benjamin P. M.|last2=Martin|first2=Nicolas F.|last3=Ibata|first3=Rodrigo A.|last4=Rix|first4=Hans-Walter|last5=Bernard|first5=Edouard J.|last6=Bell|first6=Eric F.|last7=Sesar|first7=Branimir|last8=Ferguson|first8=Annette M. N.|last9=Schlafly|first9=Edward F.|last10=Slater|first10=Colin T.|last11=Burgett|first11=William S.|last12=Chambers|first12=Kenneth C.|last13=Flewelling|first13=Heather|last14=Hodapp|first14=Klaus A.|last15=Kaiser|first15=Nicholas|last16=Kudritzki|first16=Rolf-Peter|last17=Lupton|first17=Robert H.|last18=Magnier|first18=Eugene A.|last19=Metcalfe|first19=Nigel|last20=Morgan|first20=Jeffrey S.|last21=Price|first21=Paul A.|last22=Tonry|first22=John L.|last23=Wainscoat|first23=Richard J.|last24=Waters|first24=Christopher|display-authors=10|title= A New Faint Milky Way Satellite Discovered in the PAN-STARRS1 3π Survey |journal= The Astrophysical Journal |date= 31 March 2015 |volume= 802 |issue= 2 |pages= L18 |doi= 10.1088/2041-8205/802/2/L18 |bibcode= 2015ApJ...802L..18L |arxiv= 1503.05554 |url=http://dro.dur.ac.uk/16298/1/16298.pdf?DDD25+dph1nm+d700tmt}} 4 : Dwarf galaxies|Triangulum (constellation)|Milky Way Subgroup|Astronomical objects discovered in 2015 |
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