TY - JOUR
T1 - MIKiS: The Multi-instrument Kinematic Survey of Galactic Globular Clusters. I. Velocity Dispersion Profiles and Rotation Signals of 11 Globular Clusters
AU - Ferraro, F. R.
AU - Mucciarelli, A.
AU - Lanzoni, B.
AU - Pallanca, C.
AU - Lapenna, E.
AU - Origlia, L.
AU - Dalessandro, E.
AU - Valenti, E.
AU - Beccari, G.
AU - Bellazzini, M.
AU - Vesperini, E.
AU - Varri, A.
AU - Sollima, A.
PY - 2018/6/11
Y1 - 2018/6/11
N2 - We present the first results of the Multi-Instrument Kinematic Survey of
Galactic Globular Clusters (GGCs), a project aimed at exploring the
internal kinematics of a representative sample of GGCs from the radial
velocity of individual stars, covering the entire radial extension of
each system. This is achieved by exploiting the formidable combination
of multi-object and integral field unit spectroscopic facilities of the
ESO Very Large Telescope. As a first step, here we discuss the results
obtained for 11 clusters from high and medium resolution spectra
acquired through a combination of FLAMES and KMOS observations. We
provide the first kinematical characterization of NGC 1261 and NGC 6496.
In all the surveyed systems, the velocity dispersion profile declines at
increasing radii, in agreement with the expectation from the King model
that best fits the density/luminosity profile. In the majority of the
surveyed systems, we find evidence of rotation within a few half-mass
radii from the center. These results are in general overall agreement
with the predictions of recent theoretical studies, suggesting that the
detected signals could be the relic of significant internal rotation set
at the epoch of the cluster’s formation.
Based on FLAMES and KMOS observations performed at the European Southern
Observatory as part of the Large Programme 193.D-0232 (PI: Ferraro).
AB - We present the first results of the Multi-Instrument Kinematic Survey of
Galactic Globular Clusters (GGCs), a project aimed at exploring the
internal kinematics of a representative sample of GGCs from the radial
velocity of individual stars, covering the entire radial extension of
each system. This is achieved by exploiting the formidable combination
of multi-object and integral field unit spectroscopic facilities of the
ESO Very Large Telescope. As a first step, here we discuss the results
obtained for 11 clusters from high and medium resolution spectra
acquired through a combination of FLAMES and KMOS observations. We
provide the first kinematical characterization of NGC 1261 and NGC 6496.
In all the surveyed systems, the velocity dispersion profile declines at
increasing radii, in agreement with the expectation from the King model
that best fits the density/luminosity profile. In the majority of the
surveyed systems, we find evidence of rotation within a few half-mass
radii from the center. These results are in general overall agreement
with the predictions of recent theoretical studies, suggesting that the
detected signals could be the relic of significant internal rotation set
at the epoch of the cluster’s formation.
Based on FLAMES and KMOS observations performed at the European Southern
Observatory as part of the Large Programme 193.D-0232 (PI: Ferraro).
KW - globular clusters: general
KW - stars: kinematics and dynamics
KW - techniques: spectroscopic
U2 - 10.3847/1538-4357/aabe2f
DO - 10.3847/1538-4357/aabe2f
M3 - Article
SN - 0004-637X
VL - 860
SP - 50
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
ER -