Pisces dwarf galaxy

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Galaxy
Pisces dwarf galaxy
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LGS 3 ubv.jpg
UBV image of the dwarf galaxy LGS 3
AladinLite
Constellation fishes
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 01 h 03.9 m
declination + 21 ° 53.1 ′
Appearance
Morphological type dIrr / dSph  
Brightness  (visual) 14.3 mag
Angular expansion 2 ′ × 2 ′
Physical data
Affiliation Local group  
Redshift (-9.56 ± 0.01)  ·  10 -4  
Radial velocity (-286.6 ± 0.3) km / s  
distance (2.51 ± 0.08) million ly /
(769 ± 23)  ·  10 3 pc
Absolute brightness -10.4 mag
diameter 1700 × 1700 ly
history
discovery Charles T. Kowal
Kwok-Yung Lo
Wallace LW Sargent
Discovery date October 1978
Catalog names
PGC  3792 • LGS 3

The Pisces dwarf galaxy , also known as LGS 3 , is an irregularly shaped dwarf galaxy in the constellation Pisces and is believed to be a companion galaxy to M33, the triangle galaxy . Their distance is about 2.5 million light years . The galaxy itself has a radius of only 850 light years and thus appears in the sky as an object 2 arc minutes in size.

The Pisces dwarf galaxy is difficult to observe telescopically because it has an apparent brightness of +14.3 mag and a very low surface brightness. The galaxy was discovered by astronomers Charles T. Kowal , Kwok-Yung Lo, and Wallace LW Sargent on photographic plates taken in October 1978 .

They suspected that they might belong to the local group and published them in a list that they called "Local Group Suspected" (LGS). The list contained a total of five objects, three of which were viewed as potential, previously unknown members of the local group. The newly discovered galaxy was in third place, hence the name LGS 3 .

In 1979 , Trinh X. Thuan and George E. Martin were finally able to confirm LGS 3's membership in the local group; it was ultimately the only galaxy on the LGS list to be identified as a member of the local group.

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  1. ↑ a b c d NASA / IPAC Extragalactic Database
  2. ↑ a b Lee, MG: Stellar populations of the dwarf galaxy LGS 3 in the Local Group ; in: Astronomical Journal, Vol. 110, pp. 1129ff. bibcode : 1995AJ .... 110.1129L
  3. ↑ McConnachie et al .: Distances and metallicities for 17 Local Group galaxies ; in: Monthly Notices of the Royal Astronomical Society, Vol. 356, Issue 4, pp. 979ff. bibcode : 2005MNRAS.356..979M
  4. ↑ a b International Astronomical Union Circular No. 3305