Volume 655, November 2021
|Number of page(s)||11|
|Section||Galactic structure, stellar clusters and populations|
|Published online||19 November 2021|
III. Unraveling the 3D structure of Vela⋆
GEPI, Observatoire de Paris, CNRS, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France
2 Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
Accepted: 16 August 2021
Context. The Vela complex is a region of the sky that gathers several stellar and interstellar structures in a few hundred square degrees.
Aims.Gaia data now allow us to obtain a 3D view of the Vela interstellar structures through the dust extinction.
Methods. We used the FEDReD (Field Extinction-Distance Relation Deconvolver) algorithm on near-infrared 2MASS data, cross-matched with the Gaia DR2 catalogue, to obtain a 3D cube of extinction density. We applied the FellWalker algorithm to this cube to locate clumps and dense structures.
Results. We analysed 18 million stars over 450 deg2 to obtain the extinction density of the Vela complex from 0.5 to 8 kpc at ℓ ∈ [250° ,280° ] and b ∈ [ − 10° ,5° ]. This cube reveals the complete morphology of known structures and relations between them. In particular, we show that the Vela Molecular Ridge is more likely composed of three substructures instead of four, as suggested by the 2D densities. These substructures form the shell of a large cavity. This cavity is visually aligned with the Vela supernova remnant but located at a greater distance. We provide a catalogue of location, distance, size, and total dust content of Interstellar Medium (ISM).
Key words: dust / extinction / ISM: structure / ISM: individual objects: Vela Molecular Ridge
Datacube is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (220.127.116.11) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/655/A68
© C. Hottier et al. 2021
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