Spherical component of a galaxy which extends beyond the main, visible component
A galactic halo is an extended, roughly spherical component of a galaxy which extends beyond the main, visible component.[1] Several distinct components of a galaxy comprise its halo:[2][3]
the stellar halo
the galactic corona (hot gas, i.e. a plasma)
the dark matter halo
The distinction between the halo and the main body of the galaxy is clearest in spiral galaxies, where the spherical shape of the halo contrasts with the flat disc. In an elliptical galaxy, there is no sharp transition between the other components of the galaxy and the halo.
A halo can be studied by observing its effect on the passage of light from distant bright objects like quasars that are in line of sight beyond the galaxy in question.[4]
^"OpenStax Astronomy". OpenStax.
^Helmi, Amina (June 2008). "The stellar halo of the Galaxy". The Astronomy and Astrophysics Review. 15 (3): 145–188. arXiv:0804.0019. Bibcode:2008A&ARv..15..145H. doi:10.1007/s00159-008-0009-6. ISSN 0935-4956. S2CID 2137586.
^Maoz, Dan (2016). Astrophysics in a Nutshell. Princeton University Press. ISBN 978-0-691-16479-3.
^August 2020, Meghan Bartels 31 (31 August 2020). "The Andromeda galaxy's halo is even more massive than scientists expected, Hubble telescope reveals". Space.com. Retrieved 2020-09-01.{{cite web}}: CS1 maint: numeric names: authors list (link)
comprise its halo: the stellar halo the galactic corona (hot gas, i.e. a plasma) the dark matter halo The distinction between the halo and the main body...
galactic bulge around the galactic core. However, some stars inhabit a spheroidal halo or galactic spheroid, a type of galactichalo. The orbital behaviour...
belong to the old population of the galactichalo. A 2020 study predicted the edge of the Milky Way's dark matter halo being around 292 ± 61 kpc (952,000 ± 199...
propose that dark matter halos and subhalos may contain galaxies. The dark matter halo of a galaxy envelops the galactic disc and extends well beyond...
Look up HALO, Halo, halo, or halo- in Wiktionary, the free dictionary. HALO, halo, halos or haloes may refer to: Halo (optical phenomenon) Halo (religious...
A stellar halo is the component of a galaxy's galactichalo that contains stars. The stellar halo extends far outside a galaxy's brightest regions and...
ionised, gaseous component in the galactichalo of the Milky Way. A similar body of very hot and tenuous gas in the halo of any spiral galaxy may also be...
that paper, Gonzalez, Brownlee, and Ward stated that regions near the galactichalo would lack the heavier elements required to produce habitable terrestrial...
J.; Ansari, R.; et al. (2007). "Limits on the Macho content of the GalacticHalo from the EROS-2 Survey of the Magellanic Clouds". Astronomy and Astrophysics...
or from an active galactic nucleus can slow the contraction of a forming disk. It has also been suggested that the dark matter halo can pull the galaxy...
(2000) 281-307 P. Tisserand et al., Limits on the Macho Content of the GalacticHalo from the EROS-2 Survey of the Magellanic Clouds, 2007, Astron. Astrophys...
rotation are more likely to be found in the galactichalo than in the galactic disk. The Milky Way's outer halo has many globular clusters with a retrograde...
the Sun as its center Galactichalo – Spherical component of a galaxy which extends beyond the main, visible component Galactic corona – Hot, ionised...
the dark matter halo of this galaxy. The Carnegie telescope (Carnegie Double Astrograph) was intended to study this problem of Galactic rotation. In the...
orbit of the satellite, and the mass and structure of the conjectured galactichalo around the host, and may provide a means of probing the dark matter...
they are mostly found in the outer spheroidal part of the galaxy – the galactichalo. They are the largest and most massive type of star cluster, tending...
the Galactic bulge, where the microlensing optical depth (due to stars in the Galactic disk) is about 20 times greater than through the Galactichalo. In...
globular cluster is situated about 130,000 light-years away in the galactichalo. This region was not thought to contain globular clusters. The possibility...
estimate the age of the Milky Way itself by studying Cayrel's Star in the Galactichalo, which due to its low metallicity, is believed to have formed early...
Results from Microlensing Surveys". In the Third Stromlo Symposium: The GalacticHalo. 165: 362. Bibcode:1999ASPC..165..362A. "12 Billion-year-old white-dwarf...
stars, or galactichalo, extending outward from the galaxy. The stars in this halo behave differently from the ones in Andromeda's main galactic disc, where...
the centre of the Milky Way, whereas population II stars found in the galactichalo are older and thus more metal-deficient. Globular clusters also contain...
and galaxies into connecting strings of galaxies". He discovered the galactichalo, a group of stars orbiting the Milky Way but outside the main disk....
sequence stars. Field blue stragglers can however be identified in the Galactichalo, since all surviving main sequence stars are low mass. Several explanations...
of the galactichalo and disks, providing essential clues to the assembly and enrichment history of the galaxy. In particular, the outer halo was expected...
points of their orbits are around 20 kiloparsecs from the Galactic Center at what is called the "halo break." These stars had previously been seen in Hipparcos...
the Population I metallicity B-type stars in the galactichalo that could have been borne in the galactic disk. By balancing and stimulated emission with...
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