Estimation of the Radial Scale Length and Vertical Scale Height of the Galactic Thin Disk from Cepheids

Abstract

Up-to-date data on 2214 classical Cepheids have been used. The model of an exponential matter density distribution in the Galactic thin disk has been applied. New estimates of the radial disk scale length $h_R,$ the distance of the Sun from the symmetry plane $z_{\odot }$, and the vertical disk scale height $h_z$ have been obtained. Based on samples of 1087 Cepheids younger than 120 Myr and 1127 Cepheids older than 120 Myr, we have found $h_R=2.30\pm 0.09$ kpc and $h_R=1.96\pm 0.12$ kpc, respectively. It has turned out that an unambiguous estimate of $h_R$ cannot be obtained from their overall radial distribution. However, we have constructed the radial distribution of 806 Cepheids of different ages at the time of their birth from which we have found $h_R=2.36\pm 0.24$ kpc. We show that $h_z$ depends strongly on the age of stars. For example, from 705 Cepheids younger than 120 Myr with heliocentric distances $r<6$ kpc we have found $z_{\odot }=-17\pm 4$ pc and $h_z=75\pm 5$ pc. From 393 Cepheids older than 120 Myr at $r<6$ kpc, we have found $z_{\odot }=-39\pm 11$ pc and $h_z=131\pm 10$ pc.

arXiv comment13 pages, 8 figures, 2 tables

References in corpus (30)

• The Spitzer Space Telescope Mission
• SDSS-III: Massive Spectroscopic Surveys of the Distant Universe, the Milky Way Galaxy, and Extra-Solar Planetary Systems
• Gaia Data Release 2: The astrometric solution
• GLIMPSE: I. A SIRTF Legacy Project to Map the Inner Galaxy
• The McGill Magnetar Catalog
• Star counts in the Galaxy. Simulating from very deep to very shallow photometric surveys with the TRILEGAL code
• The Dark Energy Survey Data Release 1
• The spatial structure of mono-abundance sub-populations of the Milky Way disk
• First GLIMPSE Results on the Stellar Structure of the Galaxy
• Revisiting the population of Galactic open clusters
• Mapping the stellar structure of the Milky Way thick disk and halo using SEGUE photometry
• The stellar population structure of the Galactic disk
• 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
• Rotation curve of the Milky Way from Classical Cepheids
• Spatial distribution of Galactic Wolf-Rayet stars and implications for the global population
• The spatial distribution of O-B5 stars in the solar neighborhood as measured by Hipparcos
• Displacement of the Sun from the Galactic Plane
• M Dwarfs from Hubble Space Telescope Star Counts. IV
• Early galaxy evolution from deep wide field star counts. II. First estimate of the thick disc mass function
• 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
• Analysis of the Z Distribution of Young Objects in the Galactic Thin Disk
• The Near-infrared Optimal Distances Method Applied to Galactic Classical Cepheids Tightly Constrains Mid-infrared Period--Luminosity Relations
• ESO Imaging Survey. The Stellar Catalogue in the Chandra Deep Field South
• OB Stars in the Solar Neighborhood I: Analysis of their Spatial Distribution
• Analysis of galaxy kinematics based on Cepheids from the Gaia DR2 Catalogue
• Modelling the Milky Way. I -- Method and first results fitting the thick disk and halo with DES-Y3 data
• The z Distribution of Hydrogen Clouds and Masers with Kinematic Distances
• Cepheid Kinematics and the Galactic Warp

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