Triangulum II

Coordinates: Sky map 02h 13m 17.4s, +36° 10′ 42.4″
Source: Wikipedia, the free encyclopedia.
Triangulum II
Observation data (J2000 epoch)
ConstellationTriangulum
Right ascension02h 13m 17.4s[1]
Declination+36° 10′ 42.4″[1]
Distance97.8 ± 6.5 kly (30 ± 2 kpc)[1]
Characteristics
Mass/Light ratio3600 (V)[1] M☉/L☉
Apparent size (V)3.9′[1]
Other designations
Triangulum II, Tri II, Laevens 2, Lae 2

Triangulum II (Tri II or Laevens 2) is a

Milky Way Galaxy. Like other dwarf spheroidal galaxies, its stellar population is very old: the galaxy was quenched before 11.5 billion years ago.[2] It contains only 1000 stars, yet is quite massive, having a solar mass to light ratio of 3600.[3] This is an unusually high mass for such a small galaxy.[4]

The distance from the centre of the Milky Way is 26 kpc (85 kly). The luminosity is 450 times that of the Sun.[3] This makes it one of the dimmest known galaxies.[3] The 2D half light radius is 34 pc (110 ly). The galaxy was discovered in images taken by Pan-STARRS by Benjamin P. M. Laevens in 2015.[1][3]

Triangulum II is a candidate for detecting

WIMPs as a source of dark matter.[4]

References

  1. ^ a b c d e f Laevens, Benjamin P. M.; Martin, Nicolas F.; Ibata, Rodrigo A.; Rix, Hans-Walter; Bernard, Edouard J.; Bell, Eric F.; Sesar, Branimir; Ferguson, Annette M. N.; Schlafly, Edward F.; Slater, Colin T.; et al. (31 March 2015). "A New Faint Milky Way Satellite Discovered in the PAN-STARRS1 3π Survey" (PDF). The Astrophysical Journal. 802 (2): L18.
    S2CID 54179272
    .
  2. S2CID 236965965
    .
  3. ^ a b c d Kirby, Evan N.;
    S2CID 13600560
    .
  4. ^ a b Dajose, Lori (18 November 2015). "Dark matter dominates in nearby dwarf galaxy". Phys.org. Retrieved 19 November 2015.; Lori Dajose (November 18, 2015). "Dark Matter Dominates in Nearby Dwarf Galaxy".
    Caltech
    . Retrieved December 16, 2015.
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