Canes Venatici I

Coordinates: Sky map 13h 28m 03.5s, +33° 33′ 21″
Source: Wikipedia, the free encyclopedia.
Canes Venatici Dwarf Galaxy[1]
Observation data (J2000 epoch)
ConstellationCanes Venatici
Right ascension13h 28m 03.5s[1]
Declination+33° 33′ 21″[1]
Distance711 ± 33 kly (218 ± 10 kpc)
[2] 685+23
−16 kly (210+7
−5 kpc)[3]
Apparent magnitude (V)13.9 ± 0.5[4]
Characteristics
TypedSph
Apparent size (V)17.8 ± 0.8′[5]
Other designations
CVn Dwarf Galaxy,[1] PGC 4689223

Canes Venatici I or CVn I is a dwarf spheroidal galaxy situated in the Canes Venatici constellation and discovered in 2006 in the data obtained by Sloan Digital Sky Survey.[4] It is one of the most distant known satellites of the Milky Way as of 2011 together with Leo I and Leo II.[4] The galaxy is located at a distance of about 220 kpc from the Sun and is moving away from the Sun at a velocity of about 31 km/s.[6] It is classified as a dwarf spheroidal galaxy (dSph) meaning that it has an elliptical (ratio of axes ~ 2.5:1) shape with the half-light radius of about 550 pc.[4][5]

CVn I is a relatively faint satellite of the Milky Way—its integrated luminosity is about 230,000 times that of the Sun (absolute

mass to light ratio is around 220. A high mass to light ratio implies that CVn I is predominately made up of dark matter.[6]

The stellar population of CVn I consists mainly of old stars formed more than 10 billion years ago. The metallicity of these old stars is also very low at [Fe/H] ≈ −2.08 ± 0.02, which means that they contain 110 times less heavy elements than the Sun.

neutral hydrogen in it—the upper limit is 30,000 solar masses.[8]

References

  1. ^ a b c d "NAME CVn I dSph". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2011-11-21.
  2. ^
    S2CID 14614201
    .
  3. ^
    S2CID 118674121
    .
  4. ^
    S2CID 119421888
    .
  5. ^
    S2CID 17838966
    .
  6. ^
    S2CID 9715950
    .
  7. S2CID 3185311
    .
  8. doi:10.1088/0004-637X/696/1/385
    .

External links


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