Cited by 930Astrophysical Phenomena and ObservationsAstrophysics and Star Formation StudiesGalaxies: Formation, Evolution, Phenomena

THE GALACTIC CENTER ENVIRONMENT

Morris, Mark, Serabyn, Eugene·1996·Annual Review of Astronomy and Astrophysics

Abstract

▪ Abstract The central half kiloparsec region of our Galaxy harbors a variety of phenomena unique to the central environment. This review discusses the observed structure and activity of the interstellar medium in this region in terms of its inevitable inflow toward the center of the Galactic gravitational potential well. A number of dissipative processes lead to a strong concentration of gas into a “Central Molecular Zone” of about 200-pc radius, in which the molecular medium is characterized by large densities, large velocity dispersions, high temperatures, and apparently strong magnetic fields. The physical state of the gas and the resultant star formation processes occurring in this environment are therefore quite unlike those occurring in the large-scale disk. Gas not consumed by star formation either enters a hot X ray–emitting halo and is lost as a thermally driven galactic wind or continues moving inward, probably discontinuously, through the domain of the few parsec-sized circumnuclear disks and eventually into the central parsec. There, the central radio source SgrA*currently accepts only a tiny fraction of the inflowing material, likely as a result of a limit cycle wherein the continual inflow of matter provokes star formation, which in turn can temporarily halt the inflow via mass-outflow winds.

Integrity signals

Registry

Crossref · 10.1146/annurev.astro.34.1.645

Cites

340 of 340 references verified0 citation errors · 0 not checkable

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  • The CMZ is a disk-like region of dense (≳10^3 cm^-3) gas within +1.7°≲l≲-1° (R≃200 pc, assuming Galactocentric radii 8.5 kpc), |b|≲0.5° (H≃75 pc), and |vrot|≲150 km/s.

    “The CMZ is a disk-like region of dense ( ≳ 10 3 cm -3 ) gas within + 1 . 7 ◦ ≲ l ≲ -1 ◦ ( R ≃ 200 pc, assuming a Galactocentric radii of 8 . 5 kpc), | b | ≲ 0 . 5 ◦ ( H ≃ 75 pc), and | v rot | ≲ 150 km s -1 (Panel a of Fig 8; Sofue 1995; Morris & Serabyn 1996; Molinari et al. 2011; Henshaw et al. 2016, 2022; Sormani et al. 2022).”

    From The Fermi/eROSITA bubbles: a look into the nuclear outflow from the Milky Way (2024) · cites this paper as Morris & Serabyn 1996

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Authors
Morris, M., & Serabyn, E.
Affiliations
  • University of California, Los Angeles (US)
  • California Institute of Technology (US)
Venue
Annual Review of Astronomy and Astrophysics
Published
1996-09
Volume
34
Issue
1
Pages
645-701
ISSN
  • 0066-4146 (ISSN-L)
  • 1545-4282
OpenAlex
W2127604531
Cited by
930
References
344
Citations by year
2026: 20 · 2025: 38 · 2024: 36 · 2023: 23 · 2022: 31 · 2021: 41 · 2020: 47 · 2019: 60 · 2018: 35 · 2017: 35 · 2016: 37 · 2015: 34 · 2014: 33 · 2013: 50 · 2012: 39
FWCI
1.86
Type
journal article
Language
en
Open access
closed
Locations
  • Annual Review of Astronomy and Astrophysics (publishedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
Keywords
Galactic Center, interstellar medium, Central Molecular Zone, gas inflow, molecular gas, velocity dispersion, magnetic field, star formation, galactic winds, circumnuclear disk, Sgr A*, supermassive black holes

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