New Interstellar Extinction Maps Based on Gaia and Other Sky Surveys

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Abstract

We present new three-dimensional (3D) interstellar extinctionmaps in the V and Gaia G filters
within 2 kpc of the Sun, a 3D differential extinction (dust density) map along the line of sight in the same
space, a 3D map of variations in the ratio of the extinctions in the V and Gaia G filters within 800 pc
of the Sun, and a 2D map of total Galactic extinction through the entire dust half-layer from the Sun to
extragalactic space for Galactic latitudes |b| > 13◦. The 3D maps have a transverse resolution from 3.6
to 11.6 pc and a radial resolution of 50 pc. The 2D map has an angular resolution of 6.1 arcmin. We
have produced these maps based on the Gaia DR3 parallaxes and Gaia, Pan-STARRS1, SkyMapper,
2MASS, andWISE photometry for ∼ 100 million stars. We have paid special attention to the space within
200 pc of the Sun and high Galactic latitudes as regions where the extinction estimates have had a large
relative uncertainty so far. Our maps estimate the extinction within the Galactic dust layer from the Sun
to an extended object or through the entire dust half-layer from the Sun to extragalactic space with an
accuracy σ(AV) = 0.06 mag. This gives a high relative accuracy of extinction estimates even at high
Galactic latitudes, where, according to our estimates, the median total Galactic extinction through the
entire dust half-layer from the Sun to extragalactic objects is AV = 0.12 ± 0.06 mag. We have shown that
the presented maps are among the best ones in data volume, space size, resolution, accuracy, and other
properties.

About the authors

G. A. Gontcharov

Pulkovo Astronomical Observatory, Russian Academy of Sciences

Email: georgegontcharov@yahoo.com
St. Petersburg, 196140 Russia

A. A. Marchuk

Pulkovo Astronomical Observatory, Russian Academy of Sciences; St. Petersburg State University

Email: georgegontcharov@yahoo.com
St. Petersburg, 196140 Russia; St. Petersburg

M. Yu. Khovrichev

Главная (Пулковская) астрономическая обсерватория РАН; Санкт-Петербургский государственный университет

Email: georgegontcharov@yahoo.com
St. Petersburg, 196140 Russia; St. Petersburg

A. V. Mosenkov

Pulkovo Astronomical Observatory, Russian Academy of Sciences; Department of Physics and Astronomy, Brigham Young University;

Email: georgegontcharov@yahoo.com
St. Petersburg, 190000 Russia; USA, Provo

S. S. Савченко

Pulkovo Astronomical Observatory, Russian Academy of Sciences; St. Petersburg State University; Special Astrophysical Observatory, Russian Academy of Sciences

Email: georgegontcharov@yahoo.com
St. Petersburg, 190000 Russia; St. Petersburg, 190000 Russia; Nizhnii Arkhyz, Karachai-Cherkessian Republic, 369167 Russia

V. B. Il’in

Pulkovo Astronomical Observatory, Russian Academy of Sciences; St. Petersburg State University; St. Petersburg State University of Aerospace Instrumentation

Email: georgegontcharov@yahoo.com
St. Petersburg, 196140 Russia; St. Petersburg; St. Petersburg

D. M. Poliakov

Главная (Пулковская) астрономическая обсерватория РАН; Санкт-Петербургский государственный университет

Email: georgegontcharov@yahoo.com
St. Petersburg, 190000 Russia; St. Petersburg, 190000 Russia

A. A. Smirnov

Pulkovo Astronomical Observatory, Russian Academy of Sciences; St. Petersburg State University

Author for correspondence.
Email: georgegontcharov@yahoo.com
St. Petersburg, 190000 Russia; St. Petersburg, 190000 Russia

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