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

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cris.lastimport.scopus2024-02-12T20:57:20Z
dc.abstract.enContext. 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<SUP>−1</SUP> and a scale height of 98.60<SUB>−8.46</SUB><SUP>+11.10</SUP> 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 (λ<SUB>0</SUB> = 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.
dc.affiliationUniwersytet Warszawski
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dc.date.accessioned2024-01-25T01:52:27Z
dc.date.available2024-01-25T01:52:27Z
dc.date.copyright2023-06-16
dc.date.issued2023
dc.description.accesstimeAT_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.versionFINAL_PUBLISHED
dc.description.volume674
dc.identifier.doi10.1051/0004-6361/202243283
dc.identifier.issn0004-6361
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/107694
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2023A&A...674A..40G
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomy and Astrophysics
dc.relation.pagesA40
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titleGaia Data Release 3. Exploring and mapping the diffuse interstellar band at 862 nm
dc.typeJournalArticle
dspace.entity.typePublication