J/ApJS/280/15 Extinction catalog from Gaia DR3 & LAMOST DR11 (Wang+, 2025)
An all-sky 3D dust map based on Gaia and LAMOST.
Wang T., Yuan H., Chen B., Xiang M., Zhang R., Huang B., Gu H., Wang S.,
Li J.
<Astrophys. J. Suppl. Ser., 280, 15 (2025)>
=2025ApJS..280...15W 2025ApJS..280...15W
ADC_Keywords: Extinction; Interstellar medium; Milky Way; Reddening;
Spectra, optical
Keywords: Interstellar dust ; Interstellar dust extinction ;
Interstellar extinction ; Interstellar reddening ;
Interstellar medium ; Milky Way Galaxy
Abstract:
We present a comprehensive 3D dust-reddening map covering the entire
Milky Way, constructed by combining reddening estimates based on Large
Sky Area Multi-Object Fiber Spectroscopy Telescope (LAMOST)
low-resolution spectra (E(B-V)LAMOST) with those derived from Gaia
XP spectra (E(B-V)XP), along with revised Gaia distances.
E(B-V)LAMOST values of ∼4.6 million unique sources were obtained
with the standard-pair analysis using LAMOST DR11 stellar parameters
and synthesized B-/V-band photometry from Gaia XP spectra, showing a
typical precision of ∼0.01mag. The E(B-V)XP from the catalog
of Zhang+ 2023MNRAS.524.1855Z 2023MNRAS.524.1855Z, which was derived using forward
modeling of Gaia XP spectra, were cross-validated with E(B-V)LAMOST,
leading to the selection of ∼150 million high-reliability
measurements. The combined data set achieves a median precision of
∼0.03 mag for E(B-V). To model the reddening-distance relationship
along various lines of sight, we implemented a parametric approach
that accounts for contributions from the Local Bubble, diffuse
interstellar medium, and multiple potential molecular clouds. The sky
was adaptively partitioned based on stellar density, resulting in
angular resolutions ranging from 3.4' to 58', with about half of the
sky having a resolution better than 6.9'. The reddening precision of
our 3D map for individual stars reaches ∼0.01 mag in most regions at
|b|>20°, but degrades to 0.01-0.05 mag at |b|<20°. The map
reaches a maximum distance of 3-5 kpc in high- extinction regions with
|b|<5°, and extends to 10-15 kpc elsewhere. An interactive
platform and Python package have been developed for utilization of the
3D dust map.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 95 4677295 LAMOST extinction catalog
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See also:
I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)
V/162 : LAMOST DR11 catalogs (Luo+, 2026)
J/A+A/453/635 : Modelling the Gal. Interstellar Extinction (Marshall+, 2006)
J/other/RAA/11.924 : Atmospheric parameters for 771 stars (Wu+, 2011)
J/A+A/550/A42 : Extinction map towards the Galactic bulge (Chen+, 2013)
J/ApJ/885/131 : ∼200 high-mass SFR plx & proper motion with VLBI (Reid+, 2019)
J/A+A/661/A147 : Gal. interstellar dust Gaia-2MASS 3D maps (Lallement+, 2022)
J/A+A/664/A174 : Galactic interstellar dust Gaia-2MASS 3D maps (Vergely+, 2022)
J/A+A/674/A33 : Gaia synthetic phot. cat. of white dwarfs (Gaia Coll., 2023)
J/ApJS/280/16 : All-sky cat. of MoCs from 3D dust map (Wang+, 2025)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 I10 --- ObsID [101001/1128116245] Unique spectra identifier
for LAMOST DR11
12- 30 I19 --- GaiaDR3 Unique source identifier for Gaia DR3
32- 47 F16.12 deg RAdeg [0/360] Right ascension from Gaia DR3 (ICRS)
at Ep=2016
49- 63 F15.12 deg DEdeg [-9.8/89.2] Declination from Gaia DR3 (ICRS)
at Ep=2016
65- 82 F18.15 mag E(B-V) [-0.1/2.5] E(B-V) extinction values from this
work
84- 95 F12.10 mag e_E(B-V) [0.008/0.09] Uncertainty in E(B-V) from this
work
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 25-Mar-2026