Hercules (dwarf galaxy)

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Not to be confused with Hercules A.
Hercules Dwarf Galaxy[1]
Hercules Dwarf Galaxy.jpg
Hercules has an elongated shape.
Observation data (J2000 epoch)
Constellation Hercules
Right ascension 16h 31m 02s[1]
Declination +12° 47′ 30″[1]
Distance 479+26
−23 kly (147+8
−7 kpc),[2]
430+39
−39 kly (133+6
−6 kpc[3])
Type dSph[4]
Apparent dimensions (V) 16.8′[4]
Apparent magnitude (V) 14.7 ± 0.5[4]
Other designations
Her,[1] PGC 4713560
See also: Galaxy, List of galaxies

Hercules, or Her, is a dwarf spheroidal galaxy situated in the Hercules constellation and discovered in 2006 in data obtained by the Sloan Digital Sky Survey.[4] The galaxy is located at a distance of about 140 kpc from the Sun and moves away from the Sun with a velocity of about 45 km/s.[4][5] It is classified as a dwarf spheroidal galaxy (dSph). Her has a noticeably elongated (ratio of axes ~ 3:1) shape with a half-light radius of about 350 pc.[4][6][note 1] This elongation may be caused by tidal forces acting from the Milky Way galaxy, meaning that Her is being tidally disrupted now.[3] Her also shows some gradient of velocities across the galaxy's body[7] and is embedded into a faint stellar stream,[3] which also points towards its ongoing tidal disruption.

Her is one of the smallest and faintest satellites of the Milky Way—its integrated luminosity is about 30,000 times that of the Sun (absolute visible magnitude of about −6.6),[note 2] which is comparable to the luminosity of a typical globular cluster.[4][6] However, its total mass is about 7 million solar masses, which means the galaxy's mass to light ratio is around 330. A high mass to light ratio implies that Her is dominated by dark matter.[5][note 3]

The stellar population of Her consists mainly of old stars formed more than 12 billion years ago.[3] The metallicity of these old stars is also very low at [Fe/H] ≈ −2.58 ± 0.51,[note 4] which means that they contain 400 times less heavy elements than the Sun.[8] The stars of Her were probably among the first stars to form in the Universe. Currently there is no star formation in Her.[3] Measurements have so far failed to detect neutral hydrogen in it—the upper limit is 466 solar masses.[9]

Notes

  1. ↑ From other sources the half-radius is around 230 pc.[3]
  2. ↑ From other sources the absolute magnitude is around −5.3.[3]
  3. ↑ It is difficult to estimate the mass of such faint galaxies due to significant foreground contamination, which inflates the velocity dispersion. A paper published in 2009 arrived at a lower mass estimate of about 2 million solar masses within the half-radius; the total mass within 433 pc was estimated at about 4 million solar masses.[7]
  4. ↑ From other sources the metallicity is around −2.3.[2][5]

References

  1. ↑ 1.0 1.1 1.2 1.3 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ 5.0 5.1 5.2 Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ Lua error in package.lua at line 80: module 'strict' not found.
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