Validation: Comparison with 2MASS Data

2MASS near-infrared data can be used to validate the starcount model out to K=14th mag (~2 mJy). The data was culled from the IRSA database. Artifacts and duplicated observations were eliminated (e.g., using the purge and persistence probability flags). Sources with high CHI^2 measurements (PSF-fitting) were eliminated, cleaning both artifacts and clearly extended sources from the sample. A moderate galactic longitude,l = 90 deg, was used for most tests. K-band starcounts and JHKs colors are compared with 2MASS data.

b = 90 deg

• l = 90 deg, b = 90 deg: Differential Starcounts vs. 2MASS
  
• l = 90 deg, b = 90 deg: Cummulative Starcounts vs. prototype 2MASS

• l = 90 deg, b = 30 deg: Differential Starcounts vs. 2MASS
  
• l = 90 deg, b = 30 deg: J-H, H-K, J-K colors

• l = 90 deg, b = 20 deg: Differential Starcounts vs. 2MASS

• l = 90 deg, b = 10 deg: Differential Starcounts vs. 2MASS
  
• l = 180 deg, b = 10 deg: Differential Starcounts vs. 2MASS !!new!!

• l = 90 deg, b = 5 deg: Differential Starcounts vs. 2MASS
  
• l = 90 deg, b = 5 deg: J-H, H-K, J-K colors
  note: in order to better match the colors, the model required a cloud with Av=1.0 at 1.5 kpc

• l = 90 deg, b = 2 deg: Differential Starcounts vs. 2MASS
  
• l = 90 deg, b = 2 deg: J-H, H-K, J-K colors
  note: in order to better match the colors, the model required a cloud with Av=1.0 at 1.5 kpc