Kinematics of Outer Halo Globular Clusters in M31

J. Veljanoski; A. M. N. Ferguson; A. D. Mackey; A. P. Huxor; M. J. Irwin; P. Cote; N. R. Tanvir; E. J. Bernard; S. C. Chapman; R. A. Ibata; M. Fardal; G. F. Lewis; N. F. Martin; A. McConnachie; J. Penarrubia

doi:10.1088/2041-8205/768/2/L33

Kinematics of Outer Halo Globular Clusters in M31

J. Veljanoski^*, A. M. N. Ferguson, A. D. Mackey, A. P. Huxor, M. J. Irwin, P. Cote, N. R. Tanvir, E. J. Bernard, S. C. Chapman, R. A. Ibata, M. Fardal, G. F. Lewis, N. F. Martin, A. McConnachie, J. Penarrubia

^*Corresponding author for this work

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

Abstract

We present the first kinematic analysis of the far outer halo globular cluster (GC) population in the Local Group galaxy M31. Our sample contains 53 objects with projected radii of similar to 20-130 kpc, 44 of which have no previous spectroscopic information. GCs with projected radii greater than or similar to 30 kpc are found to exhibit net rotation around the minor axis of M31, in the same sense as the inner GCs, albeit with a smaller amplitude of 79 +/- 19 km s(-1). The rotation-corrected velocity dispersion of the full halo GC sample is 106 +/- 12 km s(-1), which we observe to decrease with increasing projected radius. We find compelling evidence for kinematic coherence among GCs that project on top of halo substructure, including a clear signature of infall for GCs lying along the northwest stream. Using the tracer mass estimator, we estimate the dynamical mass of M31 within 200 kpc to be M-M31 = (1.2-1.5) +/- 0.2 x 10(12) M-circle dot. This value is highly dependent on the chosen model and assumptions within.

Original language	English
Article number	33
Number of pages	5
Journal	Astrophysical Journal Letters
Volume	768
Issue number	2
DOIs	https://doi.org/10.1088/2041-8205/768/2/L33
Publication status	Published - 10 May 2013
Externally published	Yes

Keywords

galaxies: halos
galaxies: individual (M31)
galaxies: kinematics and dynamics
globular clusters: general
Local Group
MILKY-WAY
LOCAL GROUP
SATELLITE GALAXIES
RADIAL-VELOCITY
STELLAR HALO
SYSTEM
MASS
ANDROMEDA
SUBSTRUCTURE
M87

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Veljanoski, J., Ferguson, A. M. N., Mackey, A. D., Huxor, A. P., Irwin, M. J., Cote, P., Tanvir, N. R., Bernard, E. J., Chapman, S. C., Ibata, R. A., Fardal, M., Lewis, G. F., Martin, N. F., McConnachie, A., & Penarrubia, J. (2013). Kinematics of Outer Halo Globular Clusters in M31. Astrophysical Journal Letters, 768(2), Article 33. https://doi.org/10.1088/2041-8205/768/2/L33

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title = "Kinematics of Outer Halo Globular Clusters in M31",

abstract = "We present the first kinematic analysis of the far outer halo globular cluster (GC) population in the Local Group galaxy M31. Our sample contains 53 objects with projected radii of similar to 20-130 kpc, 44 of which have no previous spectroscopic information. GCs with projected radii greater than or similar to 30 kpc are found to exhibit net rotation around the minor axis of M31, in the same sense as the inner GCs, albeit with a smaller amplitude of 79 +/- 19 km s(-1). The rotation-corrected velocity dispersion of the full halo GC sample is 106 +/- 12 km s(-1), which we observe to decrease with increasing projected radius. We find compelling evidence for kinematic coherence among GCs that project on top of halo substructure, including a clear signature of infall for GCs lying along the northwest stream. Using the tracer mass estimator, we estimate the dynamical mass of M31 within 200 kpc to be M-M31 = (1.2-1.5) +/- 0.2 x 10(12) M-circle dot. This value is highly dependent on the chosen model and assumptions within.",

keywords = "galaxies: halos, galaxies: individual (M31), galaxies: kinematics and dynamics, globular clusters: general, Local Group, MILKY-WAY, LOCAL GROUP, SATELLITE GALAXIES, RADIAL-VELOCITY, STELLAR HALO, SYSTEM, MASS, ANDROMEDA, SUBSTRUCTURE, M87",

author = "J. Veljanoski and Ferguson, {A. M. N.} and Mackey, {A. D.} and Huxor, {A. P.} and Irwin, {M. J.} and P. Cote and Tanvir, {N. R.} and Bernard, {E. J.} and Chapman, {S. C.} and Ibata, {R. A.} and M. Fardal and Lewis, {G. F.} and Martin, {N. F.} and A. McConnachie and J. Penarrubia",

year = "2013",

month = may,

day = "10",

doi = "10.1088/2041-8205/768/2/L33",

language = "English",

volume = "768",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "University of Chicago Press",

number = "2",

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TY - JOUR

T1 - Kinematics of Outer Halo Globular Clusters in M31

AU - Veljanoski, J.

AU - Ferguson, A. M. N.

AU - Mackey, A. D.

AU - Huxor, A. P.

AU - Irwin, M. J.

AU - Cote, P.

AU - Tanvir, N. R.

AU - Bernard, E. J.

AU - Chapman, S. C.

AU - Ibata, R. A.

AU - Fardal, M.

AU - Lewis, G. F.

AU - Martin, N. F.

AU - McConnachie, A.

AU - Penarrubia, J.

PY - 2013/5/10

Y1 - 2013/5/10

N2 - We present the first kinematic analysis of the far outer halo globular cluster (GC) population in the Local Group galaxy M31. Our sample contains 53 objects with projected radii of similar to 20-130 kpc, 44 of which have no previous spectroscopic information. GCs with projected radii greater than or similar to 30 kpc are found to exhibit net rotation around the minor axis of M31, in the same sense as the inner GCs, albeit with a smaller amplitude of 79 +/- 19 km s(-1). The rotation-corrected velocity dispersion of the full halo GC sample is 106 +/- 12 km s(-1), which we observe to decrease with increasing projected radius. We find compelling evidence for kinematic coherence among GCs that project on top of halo substructure, including a clear signature of infall for GCs lying along the northwest stream. Using the tracer mass estimator, we estimate the dynamical mass of M31 within 200 kpc to be M-M31 = (1.2-1.5) +/- 0.2 x 10(12) M-circle dot. This value is highly dependent on the chosen model and assumptions within.

AB - We present the first kinematic analysis of the far outer halo globular cluster (GC) population in the Local Group galaxy M31. Our sample contains 53 objects with projected radii of similar to 20-130 kpc, 44 of which have no previous spectroscopic information. GCs with projected radii greater than or similar to 30 kpc are found to exhibit net rotation around the minor axis of M31, in the same sense as the inner GCs, albeit with a smaller amplitude of 79 +/- 19 km s(-1). The rotation-corrected velocity dispersion of the full halo GC sample is 106 +/- 12 km s(-1), which we observe to decrease with increasing projected radius. We find compelling evidence for kinematic coherence among GCs that project on top of halo substructure, including a clear signature of infall for GCs lying along the northwest stream. Using the tracer mass estimator, we estimate the dynamical mass of M31 within 200 kpc to be M-M31 = (1.2-1.5) +/- 0.2 x 10(12) M-circle dot. This value is highly dependent on the chosen model and assumptions within.

KW - galaxies: halos

KW - galaxies: individual (M31)

KW - galaxies: kinematics and dynamics

KW - globular clusters: general

KW - Local Group

KW - MILKY-WAY

KW - LOCAL GROUP

KW - SATELLITE GALAXIES

KW - RADIAL-VELOCITY

KW - STELLAR HALO

KW - SYSTEM

KW - MASS

KW - ANDROMEDA

KW - SUBSTRUCTURE

KW - M87

U2 - 10.1088/2041-8205/768/2/L33

DO - 10.1088/2041-8205/768/2/L33

M3 - Article

SN - 2041-8205

VL - 768

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - 33

ER -

Kinematics of Outer Halo Globular Clusters in M31

Abstract

Keywords

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