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Verfasst von:Henshaw, Jonathan D. [VerfasserIn]   i
 Longmore, Steven N. [VerfasserIn]   i
 Kruijssen, Diederik [VerfasserIn]   i
Titel:Seeding the galactic centre gas stream
Titelzusatz:gravitational instabilities set the initial conditions for the formation of protocluster clouds
Verf.angabe:J.D. Henshaw, S.N. Longmore and J.M.D. Kruijssen
E-Jahr:2016
Jahr:25 August 2016
Umfang:5 S.
Fussnoten:Gesehen am 24.10.2017
Titel Quelle:Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society. Letters
Ort Quelle:Oxford : Oxford Univ. Press, 2005
Jahr Quelle:2016
Band/Heft Quelle:463(2016), 1, Seite L122-L126
ISSN Quelle:1745-3933
Abstract:Star formation within the Central Molecular Zone (CMZ) may be intimately linked to the orbital dynamics of the gas. Recent models suggest that star formation within the dust ridge molecular clouds (from G0.253+0.016 to Sgr B2) follows an evolutionary time sequence, triggered by tidal compression during their preceding pericentre passage. Given that these clouds are the most likely precursors to a generation of massive stars and extreme star clusters, this scenario would have profound implications for constraining the time-evolution of star formation. In this Letter, we search for the initial conditions of the protocluster clouds, focusing on the kinematics of gas situated upstream from pericentre. We observe a highly regular corrugated velocity field in {l, vLSR} space, with amplitude and wavelength A = 3.7 ± 0.1 km s−1 and λvel,i = 22.5 ± 0.1 pc, respectively. The extremes in velocity correlate with a series of massive (∼104 M⊙) and compact (Req ∼ 2 pc), quasi-regularly spaced (∼8 pc), molecular clouds. The corrugation wavelength and cloud separation closely agree with the predicted Toomre (∼17 pc) and Jeans (∼6 pc) lengths, respectively. We conclude that gravitational instabilities are driving the condensation of molecular clouds within the Galactic Centre gas stream. Furthermore, we speculate these seeds are the historical analogue of the dust-ridge molecular clouds, representing the initial conditions of star and cluster formation in the CMZ.
DOI:doi:10.1093/mnrasl/slw168
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: http://dx.doi.org/10.1093/mnrasl/slw168
 DOI: https://doi.org/10.1093/mnrasl/slw168
Datenträger:Online-Ressource
Sprache:eng
Bibliogr. Hinweis:Errata: Henshaw, Jonathan D.: Erratum to: Seeding the galactic centre gas stream
K10plus-PPN:1564703614
Verknüpfungen:→ Zeitschrift

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