The Galactic Halo density distribution from photometric survey data: results of a pilot study

Abstract

Our goal is to recover the Galactic Halo spatial density by means of field stars. To this aim, we apply a new technique to the Capodimonte Deep Field (OACDF, Alcala' et al. 2004), as a pilot study in view of the VLT Survey Telescope (VST) stellar projects. Considering the unique chance to collect deep and wide-field photometry with the VST, our method may represent a useful tool towards a definitive mapping of the Galactic Halo. In the framework of synthetic stellar populations, turn-off stars are used to reconstruct the spatial density. The determination of the space density is achieved by comparing the data with synthetic color-magnitude diagrams (CMDs). The only assumptions involve the IMF, age and metallicity of the synthetic halo population. Stars are randomly placed in the solid angle. The contributions of the various Monte Carlo distributions (with a step of 4 kpc) along the line of sight are simultaneously varied to reproduce the observed CMD. Our result on the space density is consistent with a power-law exponent n~3 over a range of Galactocentric distances from 8 to 40 kpc.

arXiv comment5 pages. Accepted for publication in Astronomy and Astrophysics

References in corpus (11)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• The Age Of Globular Clusters In Light Of Hipparcos: Resolving the Age Problem?
• The White Dwarf Cooling Sequence of the Globular Cluster Messier 4
• Starcounts Redivivus. IV. Density Laws Through Photometric Parallaxes
• Observing the dark matter density profile of isolated galaxies
• The Spheroid Luminosity and Mass Functions From HST Star Counts
• Recovering the star formation rate in the solar neighborhood
• Density profiles of dark matter haloes: diversity and dependence on environment
• Bullets in a Core Collapse Supernova Remnant: The Vela Remnant
• Calibrated stellar models for metal-poor population
• The Capodimonte Deep Field I - Presentation of the survey and first follow-up studies

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