Gaia Data Release 3. Exploring and mapping the diffuse interstellar band at 862 nm

Schultheis, M., Zhao, H., D. J. Marshall, Zhao, H. y Sarro Baro, Luis Manuel . (2023) Gaia Data Release 3. Exploring and mapping the diffuse interstellar band at 862 nm.

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Título Gaia Data Release 3. Exploring and mapping the diffuse interstellar band at 862 nm
Autor(es) Schultheis, M.
Zhao, H.
D. J. Marshall
Zhao, H.
Sarro Baro, Luis Manuel
Materia(s) Ingeniería Informática
Abstract Context. Diffuse interstellar bands (DIBs) are common interstellar absorption features in spectroscopic observations but their origins remain unclear. DIBs play an important role in the life cycle of the interstellar medium (ISM) and can also be used to trace Galactic structure. Aims. Here, we demonstrate the capacity of the Gaia-Radial Velocity Spectrometer (RVS) in Gaia DR3 to reveal the spatial distribution of the unknown molecular species responsible for the most prominent DIB at 862 nm in the RVS passband, exploring the Galactic ISM within a few kiloparsecs from the Sun. Methods. The DIBs are measured within the GSP-Spec module using a Gaussian profile fit for cool stars and a Gaussian process for hot stars. In addition to the equivalent widths and their uncertainties, Gaia DR3 provides their characteristic central wavelength, width, and quality flags. Results. We present an extensive sample of 476 117 individual DIB measurements obtained in a homogeneous way covering the entire sky. We compare spatial distributions of the DIB carrier with interstellar reddening and find evidence that DIB carriers are present in a local bubble around the Sun which contains nearly no dust. We characterised the DIB equivalent width with a local density of 0.19 ± 0.04 Å kpc−1 and a scale height of 98.60+11.10 −8.46 pc. The latter is smaller than the dust scale height, indicating that DIBs are more concentrated towards the Galactic plane. We determine the rest-frame wavelength with unprecedented precision (λ0 = 8620.86 ±0.019 Å in air) and reveal a remarkable correspondence between the DIB velocities and the CO gas velocities, suggesting that the 862 nm DIB carrier is related to macro-molecules. Conclusions. We demonstrate the unique capacity of Gaia to trace the spatial structure of the Galactic ISM using the 862 nm DIB.
Palabras clave ISM: lines and bands
ISM: kinematics and dynamics
dust
extinction
catalogs
Editor(es) EDP Sciences
Fecha 2023-06-16
Formato application/pdf
Identificador bibliuned:95-Lmsarro-0009
http://e-spacio.uned.es/fez/view/bibliuned:95-Lmsarro-0009
DOI - identifier https://doi.org/10.1051/0004-6361/202243283
ISSN - identifier 1432-0746
Nombre de la revista Astronomy & Astrophysics
Número de Volumen 674
Número de Issue A38
Idioma eng
Versión de la publicación publishedVersion
Tipo de recurso Article
Derechos de acceso y licencia http://creativecommons.org/licenses/by/4.0
info:eu-repo/semantics/openAccess
Tipo de acceso Acceso abierto
Notas adicionales La versión registrada de este artículo, publicado por primera vez en Astronomy & Astrophysics (2023) 674 - A 40, está disponible en línea en el sitio web del editor: Astronomy & Astrophysics; https://doi.org/10.1051/0004-6361/202243283
Notas adicionales The registered version of this paper, first published in Astronomy & Astrophysics (2023) 674 - A 40, is available online at the publisher's website: Astronomy & Astrophysics; https://doi.org/10.1051/0004-6361/202243283

 
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Creado: Mon, 19 Feb 2024, 23:10:36 CET