Welcome to BEAM:

A VVV and 2MASS Bulge Extinction And Metallicity Calculator

back to Oscar A. Gonzalez Homepage


EXTINCTION MAPS:

Calculates the mean EXTINCTION Ak based on the method described in Gonzalez et al. 2011 and Gonzalez et al. 2012 . As described in the article, Ak extinctions are calculated using coefficients from Cardelli et al. 1989 and the user should use those to remain consistent. E(J-Ks) values are also returned so that the user can adopt a different extinction law if required. Aks values using Nishiyama et al 2009 can also be obtained. Be aware that extinction maps have a maximum resolution of 2 arcmin and are insensitive to variations on smaller scales.

A description of the extinction law and corresponding coefficients HERE

All regions now have open access as published in Gonzalez et al. 2012: -10≤l≤+10.2 and -10≤b≤+5

Please contact O. A. Gonzalez if you request any additional information (ogonzale AT eso.org).

Single targetUpload a file
l (deg):
b (deg):
Box size ('):
Extinction law:
File:
NOTE: Each line in the file must
have the following format:
l(deg) b(deg) boxsize(') N
where N=1 means Cardelli89
and N=2 means Nishiyama09


Here is an image of the complete reddening map.

Note that it is saturated at Aks=1.5 for visualization.




METALLICITY MAPS:

Calculates the mean METALLICITY based on Gonzalez et al. 2011 . Extinctions were calculated using extinction laws from Cardelli et al. 1989 and the (J-Ks)o colors of RGB stars where used to derive [Fe/H] by interpolation between globular cluster ridge lines from Valenti et al. 2007

Note that metallicities are only significant whithin a reasonable box size (≥30 arcmin)

IMPORTANT: Maps are still under construction. Last update 28/07/2011: Maps covering 0.2≤l≤1.7 and -8≤b≤-3

Single targetUpload a file
l (deg):
b (deg):
Box size ('):
Password: * Required for querying non-public regions
File:
Password: * Required for querying non-public regions
NOTE: Each line in the file must
have the following format:
l(deg) b(deg) boxsize(')


Here is an image of the complete reddening map.

Note that it is saturated at Aks=1.5 for visualization.



Web interface and database developed with help of Rodrigo Tobar