A kinematic view of NGC 1261: structural parameters, internal dispersion, absolute proper motion and Blue Straggler Stars

Abstract

We constructed a Hubble Space Telescope (HST) astro-photometric catalog of the central region of the Galactic globular cluster NGC 1261. This catalog, complemented with Gaia DR2 data sampling the external regions, has been used to estimate the structural parameters of the system (i.e., core, half-mass, tidal radii and concentration) from its resolved star density profile. We computed high-precision proper motions thanks to multi-epoch HST data and derived the cluster velocity dispersion profile in the plane of the sky for the innermost region, finding that the system is isotropic. The combination with line-of-sight information collected from spectroscopy in the external regions provided us with the cluster velocity dispersion profile along the entire radial extension. We also measured the absolute proper motion of NGC 1261 using a few background galaxies as a reference. The radial distribution of the Blue Straggler Star population shows that the cluster is in a low/intermediate phase of dynamical evolution.

arXiv comment19 pages, 12 figures, 2 tables; accepted for publication in ApJ

References in corpus (74)

• emcee: The MCMC Hammer
• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• A new generation of PARSEC-COLIBRI stellar isochrones including the TP-AGB phase
• A catalogue of masses, structural parameters and velocity dispersion profiles of 112 Milky Way globular clusters
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. I. Overview of the Project and Detection of Multiple Stellar Populations
• The ACS Survey of Galactic Globular Clusters. XII. Photometric Binaries along the Main-Sequence
• The ACS Survey of Galactic Globular Clusters. IX. Horizontal Branch Morphology and the Second Parameter Phenomenon
• Mean proper motions, space orbits and velocity dispersion profiles of Galactic globular clusters derived from Gaia DR2 data
• Origin of the system of globular clusters in the Milky Way
• Internal Dynamics of Globular Clusters
• The giant, horizontal and asymptotic branches of galactic globular clusters. I. The catalog, photometric observables and features
• The dynamical distance and intrinsic structure of the globular cluster omega Centauri
• Proper motions and dynamics of the Milky Way globular cluster system from Gaia DR2
• Stellar Streams Discovered in the Dark Energy Survey
• An Empirical Pixel-Based Correction for Imperfect CTE. I. HST's Advanced Camera for Surveys
• Dynamical age differences among coeval star clusters as revealed by blue stragglers
• Astrometry and photometry with HST WFC3. II. Improved geometric-distortion corrections for 10 filters of the UVIS channel
• Two distinct sequences of blue straggler stars in the globular cluster M30
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - XVII. Public Catalogue Release
• Relative Frequencies of Blue Stragglers in Galactic Globular Clusters: Constraints for the Formation Mechanisms
• Hubble Space Telescope Proper Motion (HSTPROMO) Catalogs of Galactic Globular Clusters. I. Sample Selection, Data Reduction and NGC 7078 Results
• Hubble Space Telescope proper motion (HSTPROMO) catalogs of Galactic globular clusters. II. Kinematic profiles and maps
• The State-of-the-Art HST Astro-Photometric Analysis of the core of $\omega$ Centauri. I. The Catalog
• Star count density profiles and structural parameters of 26 Galactic globular clusters
• The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters
• Discovery of Carbon/Oxygen depleted Blue Straggler Stars in 47 Tucanae: the chemical signature of a mass-transfer formation process
• No Energy Equipartition in Globular Clusters
• The contribution of primordial binaries to the blue straggler population in 47 Tucanae
• The radial distribution of blue straggler stars and the nature of their progenitors
• The HST large programme on $\omega$ Centauri - II. internal kinematics
• The velocity dispersion profile of NGC 6388 from resolved-star spectroscopy: no evidence of a central cusp and new constraints on the black hole mass
• New density profile and structural parameters of the complex stellar system Terzan 5
• Double Blue Straggler sequences in GCs: the case of NGC 362
• Astrometry and photometry with HST-WFC3. I. Geometric distortion corrections of F225W, F275W, F336W bands of the UVIS-channel
• Discovery of another peculiar radial distribution of Blue Stragglers in Globular Clusters: The case of 47 Tuc
• Absolute HST Proper Motion (HSTPROMO) of Distant Milky Way Globular Clusters: Galactocentric Space Velocities and the Milky Way Mass
• The Hubble Space Telescope UV Legacy Survey of galactic globular clusters. VI. The internal kinematics of the multiple stellar populations in NGC 2808
• A novel look at energy equipartition in globular clusters
• Another Non-segregated Blue Straggler Population in a Globular Cluster: the Case of NGC 2419
• Hubble Space Telescope Proper motion (HSTPROMO) Catalogs of Galactic Globular Clusters. VI. Improved data reduction and internal-kinematic analysis of NGC 362
• The surface density profile of NGC 6388: a good candidate for harboring an intermediate-mass black hole
• Investigating mass segregation process in globular clusters with Blue Straggler Stars: the impact of dark remnants
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - XV. The dynamical clock: reading cluster dynamical evolution from the segregation level of blue straggler stars
• A Panchromatic Study of the Globular Cluster NGC 1904. I: The Blue Straggler Population
• The Outer Envelopes of Globular Clusters. II. NGC 1851, NGC 5824 and NGC 1261
• Blue Stragglers After the Main Sequence
• MIKiS: the Multi-Instrument Kinematic Survey of Galactic Globular Clusters. I. Velocity dispersion profiles and rotation signals of 11 globular clusters
• Hubble Space Telescope Proper Motion (HSTPROMO) Catalogs of Galactic Globular Clusters. V. The rapid rotation of 47 Tuc traced and modeled in three dimensions
• The Blue Straggler Population of the Globular Cluster M5
• Blue Straggler masses from pulsation properties. I. The case of NGC6541
• HST absolute Proper Motions of NGC 6681 (M70) and the Sagittarius Dwarf Spheroidal Galaxy
• Velocity anisotropy in tidally limited star clusters
• Kinematical fingerprints of star cluster early dynamical evolution
• A family picture: tracing the dynamical path of the structural properties of multiple populations in globular clusters
• The strong rotation of M5 (NGC 5904) as seen from the MIKiS Survey of Galactic Globular Clusters
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XVIII. Proper-motion kinematics of multiple stellar populations in the core regions of NGC 6352
• A Spectroscopic Analysis of Blue Stragglers, Horizontal Branch and Turn-Off Stars in Four Globular Clusters
• The HST large programme on $\omega$ Centauri -- III. Absolute proper motion
• The non-segregated population of blue straggler stars in the remote globular cluster Palomar 14
• The "UV-route" to search for Blue Straggler Stars in Globular Clusters: first results from the HST UV Legacy Survey
• Dissecting the Colour-Magnitude Diagram: A Homogeneous Catalogue of Stellar Populations in Globular Clusters
• Hubble Space Telescope proper motion (HSTPROMO) catalogs of Galactic globular clusters. IV. Kinematic profiles and average masses of blue straggler stars
• The Blue Straggler Star Population in NGC 1261: Evidence for a Post-Core-Collapse Bounce State
• Star density profiles of six old star clusters in the Large Magellanic Cloud
• Proper motions and structural parameters of the Galactic globular cluster M71
• The ESO Multi-Instrument Kinematic Survey (MIKiS) of Galactic Globular Clusters: solid body rotation and anomalous velocity dispersion profile in NGC 5986
• Discovery of a double Blue Straggler sequence in M15: new insight into the core-collapse process
• Spectral Energy Distribution of Blue Stragglers in the core of 47 Tucanae
• Blue Straggler Star Populations in Globular Clusters: II. Proper-Motion Cleaned HST Catalogs of BSSs in 38 Galactic GCs
• The origin of the two populations of blue stragglers in M30
• The central Blue Straggler population in four outer-halo globular clusters
• Investigating the Blue Straggler Stars radial distribution in globular clusters with Monte Carlo simulations
• The radial distribution of Blue stragglers in Galactic Globular Cluster NGC 6656 $-$ Clues on the dynamical status

Cited by in corpus (32)

• Accurate distances to Galactic globular clusters through a combination of Gaia EDR3, HST and literature data
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XXIII. Proper-motion catalogs and internal kinematics
• A pulsar in a binary with a compact object in the mass gap between neutron stars and black holes
• 3D core kinematics of NGC 6362: central rotation in a dynamically evolved globular cluster
• Discovery of a double sequence of blue straggler stars in the core-collapsed globular cluster NGC 6256
• Digging into the Galactic Bulge: stellar population and structure of the poorly studied cluster NGC 6316
• Empirical measurement of the dynamical ages of three globular clusters and some considerations on the use of the dynamical clock
• Ongoing hierarchical massive cluster assembly: the LISCA II structure in the Perseus complex
• Structure and Internal Kinematics of Nine Inner Milky Way Globular Clusters
• NGC 1261: an $r$-process enhanced globular cluster from the Gaia-Enceladus event
• The Gaia-ESO Survey: an extremely Li-rich giant in the globular cluster NGC 1261
• Internal kinematics and structure of the bulge globular cluster NGC 6569
• Blue Stragglers as tracers of the dynamical state of two clusters in the Small Magellanic Cloud: NGC 339 and NGC 419
• Discovery of double BSS sequences in the old Galactic open cluster Berkeley 17
• The ESO-VLT MIKiS survey reloaded: exploring the internal kinematics of NGC 6440
• Intrinsic Metallicity Variation in the Intermediate Mass Type II Globular Cluster NGC 1261
• A young white dwarf orbiting PSR J1835-3259B in the bulge globular cluster NGC 6652
• Dynamics in the outskirts of four Milky Way globular clusters: it's the tides that dominate
• The structural properties of multiple populations in the dynamically young globular cluster NGC 2419
• Towards Realistic Modeling of the Astrometric Capabilities of MCAO Systems: Detecting an Intermediate Mass Black Hole with MAVIS
• A Photometric in-depth look at the core-collapsed globular cluster NGC 6284
• An ongoing tidal capture in the Large Magellanic Cloud: the low-mass star cluster KMK88-10 captured by the massive globular cluster NGC 1835?
• The dynamical state of the globular clusters Rup 106 and IC 4499
• The dynamical age of the LMC globular cluster NGC 1835 using the "dynamical clock"
• The bulge globular cluster Terzan 6 as seen from multi-conjugate adaptive optics and HST
• The "canonical" White Dwarf Cooling Sequence of M5
• Unveiling Bifurcated Blue Straggler Sequences in NGC 2173: Insights from Binary Evolution
• Detection of a white dwarf orbiting a Carbon-Oxygen depleted blue straggler in 47 Tucanae
• Structural parameters, chronological age and dynamical age of the LMC globular cluster NGC 1754
• Fast Rotating Blue Straggler Stars in the globular cluster NGC 1851
• Revealing the stellar population of the ultra-obscured Galactic globular cluster Glimpse-C02
• The ESO-VLT MIKiS survey reloaded: velocity dispersion profile and rotation curve of NGC 1904