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        A colour-excess extinction map of the southern Galactic disc from the VVV and GLIMPSE surveys

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        Author
        Soto, M.
        Barbá, R.
        Minniti, D.
        Kunder, A.
        Majaess, D.
        Nilo-Castellón, J. L.
        Alonso-García, J.
        Leone, G.
        Morelli, L.
        Haikala, L.
        Firpo, V.
        Lucas, P.
        Emerson, J. P.
        Bidin, C. Moni
        Geisler, D.
        Saito, R. K.
        Gurovich, S.
        Ramos, R. Contreras
        Rejkuba, M.
        Barbieri, M.
        Roman-Lopes, A.
        Hempel, M.
        Alonso, M. V.
        Baravalle, L. D.
        Borissova, J.
        Kurtev, R.
        Milla, F.
        Attention
        2299/21670
        Abstract
        An improved high-resolution and deep A Ks foreground dust extinction map is presented for the Galactic disc area within 295◦ ≾ l ≾ 350◦, −1.0◦ ≾ b ≾ +1.0◦. At some longitudes the map reaches up to |b| ~ 2.25◦, for a total of ~148 deg 2. The map was constructed via the Rayleigh–Jeans colour excess (RJCE) technique based on deep near-infrared (NIR) and mid-infrared (MIR) photometry. The new extinction map features a maximum bin size of 1 arcmin, and relies on NIR observations from the Two Micron All-Sky Survey (2MASS) and new data from ESO’s Vista Variables in the Vía Láctea (VVV) survey, in concert with MIR observations from the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire. The VVV photometry penetrates ~4 mag fainter than 2MASS, and provides enhanced sampling of the underlying stellar populations in this heavily obscured region. Consequently, the new results supersede existing RJCE maps tied solely to brighter photometry, revealing a systematic underestimation of extinction in prior work that was based on shallower data. The new high-resolution and large-scale extinction map presented here is readily available to the community through a web query interface.
        Publication date
        2019-09-01
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/mnras/stz1752
        Other links
        http://hdl.handle.net/2299/21670
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