A comparative analysis of Galactic extinction at low Galactic latitudes
A.C. Schr\"oder, W. van Driel, R.C. Kraan-Korteweg

TL;DR
This study calibrates and compares various Galactic extinction maps at low latitudes using near-infrared galaxy colours, confirming overestimation by some maps and recommending the GNILC map with a correction factor.
Contribution
It provides a detailed calibration of the Schlegel et al. (1998) and Planck-based extinction maps at low Galactic latitudes, introducing correction factors and assessing their reliability.
Findings
Schlegel et al. maps overestimate extinction by ~17%.
The Fitzpatrick extinction law is confirmed for J- and K-bands.
The GNILC map is recommended with a correction factor of 0.86.
Abstract
We use near-infrared (J-K)-colours of bright 2MASS galaxies, measured within a 7"-radius aperture, to calibrate the Schlegel et al. (1998) DIRBE/IRAS Galactic extinction map at low Galactic latitudes (). Using 3460 galaxies covering a large range in extinction (up to = 1.15 or E(B-V) ~ 3.19), we derive a correction factor by fitting a linear regression to the colour-extinction relation, confirming that the Schlegel et al. maps overestimate the extinction. We argue that the use of only a small range in extinction (e.g., < 0.4) increases the uncertainty in the correction factor and may overestimate it. Our data confirms the Fitzpatrick (1999) extinction law for the J- and K-band. We also tested four all-sky extinction maps based on Planck satellite data. All maps require a correction factor as well. In three cases the application of the…
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