Were thick galactic disks made by levitation?

Sridhar, S.; Touma, Jihad R.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4862

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DC Field	Value	Language
dc.contributor.author	Sridhar, S.	-
dc.contributor.author	Touma, Jihad R.	-
dc.date.accessioned	2012-07-11T06:12:17Z	-
dc.date.available	2012-07-11T06:12:17Z	-
dc.date.issued	1996	-
dc.identifier.citation	Science, 1996, Vol.271, p973	en
dc.identifier.issn	0036-8075	-
dc.identifier.issn	1095-9203 (Online)	-
dc.identifier.uri	http://hdl.handle.net/2289/4862	-
dc.description	Restricted Access	en
dc.description.abstract	The thick disk of our galaxy displays kinematic and chemical properties that are intermediate between those of the halo and the (thin) disk stellar populations. Not all disk galaxies have a thick disk. A theory of the origins of a thick disk can potentially provide insights into the physical state of our galaxy in its infancy. Levitation, a process that relies on adiabatic capture into resonance of stellar orbits in a growing disk, is presented as a plausible formation mechanism; a 22 resonance between vertical and epicyclic oscillations drifts to large vertical energies as the disk grows adiabatically. Resonant stars levitate several kiloparsecs above the plane, forming a thick disk whose spatial distributions, kinematics, and ages leave unique observational signatures on the sky. The same process can also produce the disk globular cluster system.	en
dc.language.iso	en	en
dc.publisher	American Association for the Advancement of Science	en
dc.relation.uri	http://dx.doi.org/10.1126/science.271.5251.973	en
dc.rights	1996 American Association for the Advancement of Science	en
dc.title	Were thick galactic disks made by levitation?	en
dc.type	Article	en
Appears in Collections:	Research Papers (A&A)

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