3-D kinematics of classical Cepheids according to Gaia, EDR3 catalog

Abstract

The kinematics of about 2000 classical Cepheids of the Milky Way with data from Gaia\,EDR3 catalog has been studied. For some of these stars, there are line-of-sight velocities. On the basis of the nonlinear rotation model, the parameters of the rotation curve of the Galaxy were determined. The circular linear rotation velocity of the near-solar neighborhood around the Galaxy center was $V_0=236\pm 3$~km s${}^{-1}$ for the assumed Sun's galactocentric distance $R_0=8.1\pm 0.1$~kpc. Analysis of residual velocities of Cepheids based on the linear Ogorodnikov-Milne model showed the presence of the following significantly different from zero gradients: $\partial U/\partial x,$ $\partial U/\partial z,$ $\partial V/\partial x,$ $\partial V/\partial z$ and $\partial W/\partial x,$ which behaves differently depending on the selection radius. The most interesting is the gradient $\partial W/\partial x\sim -0.5\pm 0.1$~km s${}^{-1}$ kpc${}^{-1}$ (positive rotation of this star system around the galactic axis $y$, ${\Omega }_y$) since the velocities $W$ are free of galactic rotation. Here we have an indirect influence of various effects leading to a perturbation of the vertical velocities of the galactic disk stars. Based on a simpler model, a more accurate estimate of this rotation is obtained, ${\Omega }_y=0.51\pm 0.07$~km s${}^{-1}$ kpc${}^{-1}$.

arXiv comment20 pages, 4 figures, 3 tables. Accepted to be published in Research in Astronomy and Astrophysics

References in corpus (58)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Gaia mission
• Local Kinematics and the Local Standard of Rest
• GLIMPSE: I. A SIRTF Legacy Project to Map the Inner Galaxy
• The Radial Velocity Experiment (RAVE): first data release
• Preliminary Results from NEOWISE: An Enhancement to the Wide-field Infrared Survey Explorer for Solar System Science
• The PPMXL catalog of positions and proper motions on the ICRS. Combining USNO-B1.0 and 2MASS
• Trigonometric Parallaxes Of High-Mass Star Forming Regions: Our View Of The Milky Way
• The Milky Way's Circular Velocity Curve to 60 kpc and an Estimate of the Dark Matter Halo Mass from Kinematics of ~2400 SDSS Blue Horizontal Branch Stars
• LAMOST Experiment for Galactic Understanding and Exploration (LEGUE) The survey science plan
• A dynamically young and perturbed Milky Way disk
• Three Dimensional Structure of the Milky Way Disk
• Vertical waves in the solar neighbourhood in Gaia DR2
• The Milky Way's circular velocity curve between 4 and 14 kpc from APOGEE data
• The Circular Velocity Curve of the Milky Way from $5$ to $25$ kpc
• Galactic Kinematics of Cepheids from Hipparcos Proper Motions
• Outer structure of the Galactic warp and flare: explaining the Canis Major over-density
• Galactoseismology: Discovery of Vertical Waves in the Galactic Disk
• Old stellar Galactic disc in near-plane regions according to 2MASS: scales, cut-off, flare and warp
• On Galactic density modeling in the presence of dust extinction
• Global properties of the HI distribution in the outer Milky Way
• The Influence of Sagittarius and the Large Magellanic Cloud on the Milky Way Galaxy
• A three-dimensional map of the Milky Way using classical Cepheid variable stars
• On the Effect of Rotation on Populations of Classical Cepheids II. Pulsation Analysis for Metallicities 0.014, 0.006, and 0.002
• Direct determination of the spiral pattern rotation speed of the Galaxy
• Rotation curve of the Milky Way from Classical Cepheids
• Local Stellar Kinematics from RAVE Data: I. Local Standard of Rest
• The Galactic warp revealed by Gaia DR2 kinematics
• Galactic seismology: the evolving "phase spiral" after the Sagittarius dwarf impact
• Characteristics of the Galaxy according to Cepheids
• The First VERA Astrometry Catalog
• Evidence of a dynamically evolving Galactic warp
• Determination of the Local Standard of Rest using the LSS-GAC DR1
• The Milky Way Spiral Structure Parameters from Data on Masers and Selected Open Clusters
• The Rotation Curve, Mass Distribution and Dark Matter Content of the Milky Way from Classical Cepheids
• Galactic masers: kinematics, spiral structure and the disk dynamic state
• Kinematics with Gaia DR2: The Force of a Dwarf
• Exploring the Galactic Warp Through Asymmetries in the Kinematics of the Galactic Disk
• Classical Cepheids and the spiral structure of the Milky Way
• The Near-infrared Optimal Distances Method Applied to Galactic Classical Cepheids Tightly Constrains Mid-infrared Period--Luminosity Relations
• Mapping the Galactic disk with the LAMOST and Gaia Red clump sample. VI: An evidence for the long lived non-steady warp of non-gravitational scenarios
• Galactic Bulge Population II Cepheids in the VVV Survey: Period-Luminosity Relations and a Distance to the Galactic Center
• A New Estimate of the Best Value for the Solar Galactocentric Distance
• Milky Way rotation curve from proper motions of red clump giants
• Classical Cepheids in the Galactic outer ring R1R2'
• Estimation of the Galactic Spiral Pattern Speed from Cepheids
• An extremely low mid-infrared extinction law toward the Galactic Center and 4% distance precision to 55 classical Cepheids
• Analysis of galaxy kinematics based on Cepheids from the Gaia DR2 Catalogue
• Warp and flare of the Galactic disc revealed with supergiants by Gaia EDR3
• Excitation of vertical breathing motion in disc galaxies by tidally-induced spirals in fly-by interactions
• Gaia-DR2 extended kinematical maps. Part III: Rotation curves analysis, dark matter, and Modified Newtonian dynamics tests
• A Case against a Significant Detection of Precession in the Galactic Warp
• Cepheid Kinematics and the Galactic Warp
• The structure and kinematics of the the Galaxy thin gaseous disc outside the solar orbit
• Orientation Parameters of the Cepheid System in the Galaxy
• Estimation of the Radial Scale Length and Vertical Scale Height of the Galactic Thin Disk from Cepheids
• Three-Dimensional Kinematics of Classical Cepheids

Cited by in corpus (3)

• The Milky Way as Seen by Classical Cepheids I: Distances Based on Mid-infrared Photometry
• Estimation of the Galactocentric Distance of the Sun from Cepheids Close to the Solar Circle
• Three Models of the Gravitational Potential of the Milky Way