Galactic kinematics with RAVE data

L. Veltz; O. Bienaymé; K. C. Freeman; J. Binney; J. Bland-Hawthorn; B. K. Gibson; G. Gilmore; E. K. Grebel; A. Helmi; U. Munari; J. F. Navarro; Q. A. Parker; G. M. Seabroke; A. Siebert; M. Steinmetz; F. G. Watson; M. Williams; R. F G Wyse; T. Zwitter

doi:10.1051/0004-6361:20066948

Galactic kinematics with RAVE data

L. Veltz^*, O. Bienaymé, K. C. Freeman, J. Binney, J. Bland-Hawthorn, B. K. Gibson, G. Gilmore, E. K. Grebel, A. Helmi, U. Munari, J. F. Navarro, Q. A. Parker, G. M. Seabroke, A. Siebert, M. Steinmetz, F. G. Watson, M. Williams, R. F G Wyse, T. Zwitter

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

60 Citations (Scopus)

Abstract

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 ± 10 pc and 1048 ± 36 pc. 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.

Original language	English
Pages (from-to)	753-765
Number of pages	13
Journal	Astronomy and Astrophysics
Volume	480
Issue number	3
DOIs	https://doi.org/10.1051/0004-6361:20066948
Publication status	Published - Mar 2008

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Veltz, L., Bienaymé, 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., & Zwitter, T. (2008). Galactic kinematics with RAVE data. Astronomy and Astrophysics, 480(3), 753-765. https://doi.org/10.1051/0004-6361:20066948

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title = "Galactic kinematics with RAVE data",

abstract = "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 ± 10 pc and 1048 ± 36 pc. 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.",

author = "L. Veltz and O. Bienaym{\'e} and Freeman, {K. C.} and J. Binney and J. Bland-Hawthorn and Gibson, {B. K.} and G. Gilmore and Grebel, {E. K.} and A. Helmi and U. Munari and Navarro, {J. F.} and Parker, {Q. A.} and Seabroke, {G. M.} and A. Siebert and M. Steinmetz and Watson, {F. G.} and M. Williams and Wyse, {R. F G} and T. Zwitter",

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doi = "10.1051/0004-6361:20066948",

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Veltz, L, Bienaymé, O, Freeman, KC, Binney, J, Bland-Hawthorn, J, Gibson, BK, Gilmore, G, Grebel, EK, Helmi, A, Munari, U, Navarro, JF, Parker, QA, Seabroke, GM, Siebert, A, Steinmetz, M, Watson, FG, Williams, M, Wyse, RFG & Zwitter, T 2008, 'Galactic kinematics with RAVE data', Astronomy and Astrophysics, vol. 480, no. 3, pp. 753-765. https://doi.org/10.1051/0004-6361:20066948

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T1 - Galactic kinematics with RAVE data

AU - Veltz, L.

AU - Bienaymé, O.

AU - Freeman, K. C.

AU - Binney, J.

AU - Bland-Hawthorn, J.

AU - Gibson, B. K.

AU - Gilmore, G.

AU - Grebel, E. K.

AU - Helmi, A.

AU - Munari, U.

AU - Navarro, J. F.

AU - Parker, Q. A.

AU - Seabroke, G. M.

AU - Siebert, A.

AU - Steinmetz, M.

AU - Watson, F. G.

AU - Williams, M.

AU - Wyse, R. F G

AU - Zwitter, T.

PY - 2008/3

Y1 - 2008/3

N2 - 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 ± 10 pc and 1048 ± 36 pc. 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.

AB - 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 ± 10 pc and 1048 ± 36 pc. 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.

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DO - 10.1051/0004-6361:20066948

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SN - 0004-6361

VL - 480

SP - 753

EP - 765

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 3

ER -

Galactic kinematics with RAVE data

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