2008A&A...480..753V


Query : 2008A&A...480..753V

2008A&A...480..753V - Astronomy and Astrophysics, volume 480, 753-765 (2008/3-4)

Galactic kinematics with RAVE data. I. The distribution of stars towards the Galactic poles.

VELTZ L., BIENAYME O., FREEMAN K.C., BINNEY J., BLAND-HAWTHORN J., GIBSON B.K., GILMORE G., GREBEL E.K., HELMI A., MUNARI U., NAVARRO J.F., PARKER Q.A., SEABROKE G.M., SIEBERT A., STEINMETZ M., WATSON F.G., WILLIAMS M., WYSE R.F.G. and ZWITTER T.

Abstract (from CDS):

We analyze the distribution of G and K type stars towards the Galactic poles using RAVE and ELODIE radial velocities, 2MASS photometric star counts, and UCAC2 proper motions. The combination of photometric and 3D kinematic data allows us to disentangle and describe the vertical distribution of dwarfs, sub-giants and giants and their kinematics. We identify discontinuities within the kinematics and magnitude counts that separate the thin disk, thick disk and a hotter component. The respective scale heights of the thin disk and thick disk are 225±10pc and 1048±36pc. We also constrain the luminosity function and the kinematic distribution function. The existence of a kinematic gap between the thin and thick disks is incompatible with the thick disk having formed from the thin disk by a continuous process, such as scattering of stars by spiral arms or molecular clouds. Other mechanisms of formation of the thick disk such as ``created on the spot'' or smoothly ``accreted'' remain compatible with our findings.

Abstract Copyright:

Journal keyword(s): stars: kinematics - Galaxy: disk - Galaxy: fundamental parameters - Galaxy: kinematics and dynamics - Galaxy: structure

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME SGP reg 00 51 26.275 -27 07 41.70           ~ 539 0
2 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1106 0
3 NAME Hercules Stream MGr ~ ~           ~ 209 0
4 NAME Arcturus Stream MGr ~ ~           ~ 70 1

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2022.08.09-04:08:35

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