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        Extinction ratios in the inner Galaxy as revealed by the VVV survey

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        Author
        Alonso-García, Javier
        Minniti, Dante
        Catelan, Márcio
        Ramos, Rodrigo Contreras
        Gonzalez, Oscar A.
        Hempel, Maren
        Lucas, Philip W.
        Saito, Roberto K.
        Valenti, Elena
        Zoccali, Manuela
        Attention
        2299/20654
        Abstract
        Interstellar extinction towards the Galactic Center is large and significantly differential. Its reddening and dimming effects in red clump stars in the Galactic Bulge can be exploited to better constrain the extinction law towards the innermost Galaxy. By virtue of a deep and complete catalog of more than 30 million objets at $|l|\le2.7\deg$ and $|b|\le1.55\deg$ obtained from VVV survey observations, we apply the red clump method to infer the selective-to-total extinction ratios in the $Z$, $Y$, $J$, $H$ and $K_s$ broadband near-infrared filters. The measured values are smaller than previously reported, and are not constant, with mean values, e.g., $A_{K_S}/E(J-K_s)=0.428\pm0.005\pm0.04$ and $A_{K_S}/E(H-K_s)=1.104\pm0.022\pm0.2$. We also obtain a ratio $A_Z$:$A_Y$:$A_J$:$A_H$:$A_{K_S}$ of 7.74:5.38:3.30:1.88:1.0, implying extinction towards the Galactic Center to follow a distribution as a function of wavelength steeper than previously reported, consistent with a power law $A_{\lambda}\propto{\lambda}^{-2.47}$ in the near-infrared.
        Publication date
        2017-11-01
        Published in
        Astrophysical Journal Letters
        Published version
        https://doi.org/10.3847/2041-8213/aa92c3
        License
        Other
        Other links
        http://hdl.handle.net/2299/20654
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