Query : 2004A&A...428..891P

2004A&A...428..891P - Astronomy and Astrophysics, volume 428, 891-903 (2004/12-4)

3D outer bulge structure from near infrared star counts.


Abstract (from CDS):

We attempt to study the characteristics of the different stellar populations present in the Galactic central region. A Monte Carlo method is used to simultaneously fit 11 thin disc and triaxial outer bulge density parameters on (Ks, J-Ks) star count data in almost 100 windows from the DENIS near infrared large scale survey at -8°<l<12° and |b|<4°. Various bulge density profiles and luminosity functions were tested using a population synthesis scheme. The best models, selected by a maximum likelihood test, give the following description: the outer bulge is boxy, prolate, and oriented 10.6°±3° with respect to the Sun-center direction. It seems that the main bulge population is not older than 10Gyr, but this preliminary result needs further work to be confirmed. A significant central hole is found in the middle of the thin disc. We discuss these results in regard to previous findings and the scenario of bulge formation.

Abstract Copyright:

Journal keyword(s): Galaxy: structure - Galaxy: stellar content - Galaxy: bulge - Galaxy: disk

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 505 1
2 NAME Scutum Spiral Arm PoG ~ ~           ~ 347 0
3 NAME Galactic Bulge reg ~ ~           ~ 4208 0

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