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

CAPACCIOLI, MASSIMO (2007) The Galactic halo stellar density distribution from photometric survey data: results of a pilot study. [Pubblicazione su rivista scientifica]

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Abstract

Aims.Our goal is to recover the Galactic halo spatial density by means of field stars. To this aim, we have applied a new technique to the Capodimonte Deep Field (OACDF, Alcalá et al. 2004), as a pilot study in view of the VLT Survey Telescope (VST) stellar projects. Considering this unique chance to collect deep and wide-field photometry with the VST, our method may represent a useful tool towards definitive mapping of the Galactic halo. Methods: In the framework of synthetic stellar populations, turn-off stars are used to reconstruct the spatial density. The space density is determined 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. Results: Our result for the space density is consistent with a power-law exponent n≈ 3 over a range of Galactocentric distances from 8 to 40 kpc.

Tipologia di documento:Pubblicazione su rivista scientifica
Settori scientifico-disciplinari MIUR:Non specificato
Stato del full text:Accessibilità ristretta
Data:2007
Altri Autori:M. Cignoni, V. Ripepi, M. Marconi, J.M. Alcalá, M. Capaccioli, M. Pannella, R. Silvotti,
Numero di pagine:5
Intervallo di pagina:pp. 475-479
Volume:463
Numero:3
Dipartimento o Struttura:Dipartimento di Scienze Fisiche
Numero identificativo:10.1051/0004-6361:20066598
Titolo rivista/pubblicazione:ASTRONOMY & ASTROPHYSICS
Numero di sistema:6646
Depositato il:20 Ottobre 2010 10:33
Ultima modifica:20 Ottobre 2010 10:33

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