NGC 1850

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NGC 1850
A Hubble Space Telescope (HST) image of NGC 1850.
Observation data (J2000.0 epoch)
ConstellationDorado
Right ascension05h 08m 50.190s[1]
Declination−68° 45′ 35.65″[1]
Apparent magnitude (V)9.0
Apparent dimensions (V)3.4′
Physical characteristics
Mass41,700+10,800
−8,600[2] M☉
Radius16.2 ± 1.1 ly (4.97 ± 0.35 pc)[2]
Tidal radius9.82 ± 0.39 ly (3.01 ± 0.12 pc)[2]
                 = −0.3[2] dex
Estimated age~100 Myr[2]
Other designationsNGC 1850, ESO 056-SC070, h 2780, GC 1060
See also: Globular cluster, List of globular clusters

NGC 1850 is a

Dorado constellation, located in the northwest part[3] of the bar of the Large Magellanic Cloud,[4] at a distance of 168 kly (51.5 kpc) from the Sun.[citation needed] It was discovered by Scottish astronomer James Dunlop
in 1826.

This is an unusual cluster system because the main distribution of stars is like a

″ to the west of the main cluster.[6] There are indications of interactions between the two, with the larger component being irregular and showing a tail toward the northwest.[3]

The main cluster is around 100 million years old,

mass of the Sun.[2] The stellar component is split into two main sequence populations, with about a quarter of the stars in a blue (hotter) group and the rest in a redder (cooler) population.[2] The cluster is embedded in an ionization region designated Henize 103.[7]

The much younger subcluster, often designated NGC 1850A,

′ from the central clump. Seven subcluster members have masses of ≥ 35 M☉, and two of those are ≥ 50 M☉. Lower mass members up to ~3 M☉ are still on the pre-main-sequence stage. The age distribution of the subcluster members indicate star formation has been active almost constantly since its formation. The eastern side of the cluster is more obscured and has fewer OB stars.[6]

In November 2021, astronomers using MUSE on the Very Large Telescope reported the discovery of a stellar-mass black hole in NGC 1850 by viewing its influence on the motion of a star in close proximity, the first direct dynamical detection of a black hole in a young massive cluster.[8]

  • ESO image of NGC 1850 showing the stellar cluster and surrounding nebulosity
    ESO
    image of NGC 1850 showing the stellar cluster and surrounding nebulosity

References

  1. ^
    S2CID 118331608
    . 48.
  2. ^
    doi:10.1093/mnras/stx010
    .
  3. ^
    ISBN 9780521480703
    .
  4. ^
    doi:10.1086/187590
    .
  5. Bibcode:2002IAUS..207..745G
    .
  6. ^
    Bibcode:1998A&A...330..492C
    .
  7. S2CID 119484423
    .
  8. ^ "Black hole found hiding in star cluster outside our galaxy". ESO. 11 November 2021. Retrieved 11 November 2021.
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