2013ApJ...764..123S

Query : 2013ApJ...764..123S

2013ApJ...764..123S - Astrophys. J., 764, 123 (2013/February-3)

Meridional tilt of the stellar velocity ellipsoid during bar buckling instability.

SAHA K., PFENNIGER D. and TAAM R.E.

Abstract (from CDS):

The structure and evolution of the stellar velocity ellipsoid play an important role in shaping galaxies undergoing bar-driven secular evolution and the eventual formation of a boxy/peanut bulge such as is present in the Milky Way. Using collisionless N-body simulations, we show that during the formation of such a boxy/peanut bulge, the meridional shear stress of stars, which can be measured by the meridional tilt of the velocity ellipsoid, reaches a characteristic peak in its time evolution. It is shown that the onset of a bar buckling instability is closely connected to the maximum meridional tilt of the stellar velocity ellipsoid. Our findings bring a new insight to this complex gravitational instability of the bar which complements the buckling instability studies based on orbital models. We briefly discuss the observed diagnostics of the stellar velocity ellipsoid during such a phenomenon.

Abstract Copyright: ∼

Journal keyword(s): galaxies: bulges - galaxies: evolution - galaxies: halos - galaxies: kinematics and dynamics - galaxies: structure - Galaxy: disk

Simbad objects: 1

goto Full paper

goto View the references in ADS

Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Galactic Bar reg ~ ~           ~ 1458 0

Query : 2013ApJ...764..123S

Basic data :
NAME Galactic Bar -- Region defined in the Sky
Other object types: otypes_help 		reg ()
ICRS coord. (ep=J2000) : 		No Coord.

Identifiers (1) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

NAME Galactic Bar

References (1458 between 1850 and 2026) (Total 1458)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
Follow new references on this object
                Reference summaries :

                from: to:

                 or select by : (not exhaustive, explanation here)

Observing logs

ISO : 5   

   

Annotations :
Annotations allow a user to add a note or report an error concerning the astronomical object and its data. It requires registration to post a note. See description .
Please, have a look at Best practices. The list of all annotations to SIMBAD objects can be found here .

The annotation server is currently not available. Sorry for any inconvenience

To bookmark this query, right click on this link: simbad:objects in 2013ApJ...764..123S and select 'bookmark this link' or equivalent in the popup menu