Observatoire des Sciences de l'Univers THETA de Franche-Comté-Bourgogne

Besançon model of stellar population synthesis of the Galaxy

Institut UTINAM

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last modification: Thu Feb, 15 2018 15:12 CET

Welcome to the Besançon Model of the Galaxy web site.

The service is now available using two ways.
You can access the form as in previous version or directly access to parameters in web service mode.

To access the forms, you must be logged in; create an account if you do not have one yet.

See the description for details about this new version

We have computed star counts in a number of directions, for those who just need an estimation of the number of stars at a given magnitude. These tables are computed in step of 1 magnitude and in the Johnson V band.
Table 1 gives the differential star counts per square degree in different directions for magnitude bins between 3 and 21. The indicated number at the top of each column is the inferior magnitude of the bin. Hence column N7 gives counts in magnitude bin 7<V<8.
Table 2 gives the cumulative star counts per square degree in different directions, that is up to a given magnitude between 3 and 21. The indicated number at the top of each column is themaximum magnitude to which the stars have been counted. Hence column N7 gives counts with V<7.
N10 N11 N12 N13
N14 N15 N16 N17
N18 N19 N20

Other related services are also available (or will be soon available):

  • The Mabuls service provides maps of the microlensing events expected, optical depth, time durations, etc. It is available at "Mabuls"
  • The Gravpot16 service is able to compute orbits, assuming the Besancon Galaxy Model gravitational potential (Fernandez-Trincado et al, 2017). Have a look at "GravPot16"
  • The GUMS Simulations (Gaia Universe Model Snapshot, Robin et al. 2012) of the Gaia catalogue are available at the CDS "GUMS"
For the Gaia mission, we have computed specific star counts in the G band, using a slightly different model, described in Robin et al (2012) [ADS] and using the DPAC computing tool GOG (Gaia Object Generator, http://cdsads.u-strasbg.fr/abs/2014A%26A...566A.119L). These simulations are available here. These star counts are summarized in this table
# HealPix HealPixBin-l HealPixBin-b Gmagcount3 Gmagcount4 Gmagcount5 Gmagcount6 Gmagcount6 Gmagcount8 Gmagcount9 Gmagcount10 Gmagcount11 Gmagcount12 Gmagcount13 Gmagcount14 Gmagcount15 Gmagcount16 Gmagcount17 Gmagcount18 Gmagcount19 Gmagcount20 
0 45.000000 87.660747 0.000000 0.000000 0.000000 0.000000 1.000000 3.000000 11.000000 38.000000 74.000000 167.000000 341.000000 606.000000 1051.000000 1539.000000 2401.000000 3354.000000 4835.000000 1996.000000 
1 135.000000 87.660747 0.000000 0.000000 0.000000 1.000000 3.000000 8.000000 8.000000 29.000000 73.000000 168.000000 370.000000 624.000000 991.000000 1473.000000 2376.000000 3371.000000 4677.000000 2031.000000 
in healpix sky regions of 8.59 square degree each. They include photometric errors for the end of mission. The Galaxy model follows mainly the thin disc modelling explained in Czekaj et al (2014) [ADS], and the same thick disc, bulge and halo, as in model msp1612 presented above.

You can still access the previous version if you need to.