Gaia Focused Product Release: Spatial distribution of two diffuse interstellar bands

Diffuse interstellar bands (DIBs) are absorption features seen in optical and infrared spectra of stars and extragalactic objects that are probably caused by large and complex molecules in the galactic interstellar medium (ISM). Here we investigate the Galactic distribution and properties of two DIB...

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Autores: Schultheis, M., Zhao, H., Zwitter, T., Bailer-Jones, C. A., Carballo, R., Sordo, R., Drimmel, R., Torralba Elipe, Guillermo, Zucker, S., Et al.
Tipo de recurso: artículo
Fecha de publicación:2023
País:España
Institución:Universidad Europea (UEM)
Repositorio:ABACUS. Repositorio de Producción Científica
Idioma:inglés
OAI Identifier:oai:abacus.universidadeuropea.com:11268/12868
Acceso en línea:http://hdl.handle.net/11268/12868
Access Level:acceso abierto
Palabra clave:Astronomy and astrophysics
Ciencia
Astronomía
Astrofísica
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spelling Gaia Focused Product Release: Spatial distribution of two diffuse interstellar bandsSchultheis, M.Zhao, H.Zwitter, T.Bailer-Jones, C. A.Carballo, R.Sordo, R.Drimmel, R.Torralba Elipe, GuillermoZucker, S.Et al.Astronomy and astrophysicsCienciaAstronomíaAstrofísicaDiffuse interstellar bands (DIBs) are absorption features seen in optical and infrared spectra of stars and extragalactic objects that are probably caused by large and complex molecules in the galactic interstellar medium (ISM). Here we investigate the Galactic distribution and properties of two DIBs identified in almost six million stellar spectra collected by the Gaia Radial Velocity Spectrometer. These measurements constitute a part of the Gaia Focused Product Release to be made public between the Gaia DR3 and DR4 data releases. In order to isolate the DIB signal from the stellar features in each individual spectrum, we identified a set of 160 000 spectra at high Galactic latitudes (|b| ⩾ 65◦ ) covering a range of stellar parameters which we consider to be the DIB-free reference sample. Matching each target spectrum to its closest reference spectra in stellar parameter space allowed us to remove the stellar spectrum empirically, without reference to stellar models, leaving a set of six million ISM spectra. Using the star’s parallax and sky coordinates, we then allocated each ISM spectrum to a voxel (VOlume piXEL) on a contiguous three-dimensional grid with an angular size of 1.8 ◦ (level 5 HEALPix) and 29 unequally sized distance bins. Identifying the two DIBs at 862.1 nm (λ862.1) and 864.8 nm (λ864.8) in the stacked spectra, we modelled their shapes and report the depth, central wavelength, width, and equivalent width (EW) for each, along with confidence bounds on these measurements. We then explored the properties and distributions of these quantities and compared them with similar measurements from other surveys. Our main results are as follows: (1) the strength and spatial distribution of the DIBλ862.1 are very consistent with what was found in Gaia DR3, but for this work we attained a higher signal-to-noise ratio in the stacked spectra to larger distances, which allowed us to trace DIBs in the outer spiral arm and beyond the Scutum–Centaurus spiral arm; (2) we produced an all-sky map below ±65◦ of Galactic latitude to ∼4000 pc of both DIB features and their correlations; (3) we detected the signals of DIBλ862.1 inside the Local Bubble (≲200 pc); and (4) there is a reasonable correlation with the dust reddening found from stellar absorption and EWs of both DIBs with a correlation coefficient of 0.90 for λ862.1 and 0.77 for λ864.8.20242024-05-2620232023-01-0120232023-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/11268/12868reponame:ABACUS. Repositorio de Producción Científicainstname:Universidad Europea (UEM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:abacus.universidadeuropea.com:11268/128682026-06-11T12:41:27Z
dc.title.none.fl_str_mv Gaia Focused Product Release: Spatial distribution of two diffuse interstellar bands
title Gaia Focused Product Release: Spatial distribution of two diffuse interstellar bands
spellingShingle Gaia Focused Product Release: Spatial distribution of two diffuse interstellar bands
Schultheis, M.
Astronomy and astrophysics
Ciencia
Astronomía
Astrofísica
title_short Gaia Focused Product Release: Spatial distribution of two diffuse interstellar bands
title_full Gaia Focused Product Release: Spatial distribution of two diffuse interstellar bands
title_fullStr Gaia Focused Product Release: Spatial distribution of two diffuse interstellar bands
title_full_unstemmed Gaia Focused Product Release: Spatial distribution of two diffuse interstellar bands
title_sort Gaia Focused Product Release: Spatial distribution of two diffuse interstellar bands
dc.creator.none.fl_str_mv Schultheis, M.
Zhao, H.
Zwitter, T.
Bailer-Jones, C. A.
Carballo, R.
Sordo, R.
Drimmel, R.
Torralba Elipe, Guillermo
Zucker, S.
Et al.
author Schultheis, M.
author_facet Schultheis, M.
Zhao, H.
Zwitter, T.
Bailer-Jones, C. A.
Carballo, R.
Sordo, R.
Drimmel, R.
Torralba Elipe, Guillermo
Zucker, S.
Et al.
author_role author
author2 Zhao, H.
Zwitter, T.
Bailer-Jones, C. A.
Carballo, R.
Sordo, R.
Drimmel, R.
Torralba Elipe, Guillermo
Zucker, S.
Et al.
author2_role author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv
dc.subject.none.fl_str_mv Astronomy and astrophysics
Ciencia
Astronomía
Astrofísica
topic Astronomy and astrophysics
Ciencia
Astronomía
Astrofísica
description Diffuse interstellar bands (DIBs) are absorption features seen in optical and infrared spectra of stars and extragalactic objects that are probably caused by large and complex molecules in the galactic interstellar medium (ISM). Here we investigate the Galactic distribution and properties of two DIBs identified in almost six million stellar spectra collected by the Gaia Radial Velocity Spectrometer. These measurements constitute a part of the Gaia Focused Product Release to be made public between the Gaia DR3 and DR4 data releases. In order to isolate the DIB signal from the stellar features in each individual spectrum, we identified a set of 160 000 spectra at high Galactic latitudes (|b| ⩾ 65◦ ) covering a range of stellar parameters which we consider to be the DIB-free reference sample. Matching each target spectrum to its closest reference spectra in stellar parameter space allowed us to remove the stellar spectrum empirically, without reference to stellar models, leaving a set of six million ISM spectra. Using the star’s parallax and sky coordinates, we then allocated each ISM spectrum to a voxel (VOlume piXEL) on a contiguous three-dimensional grid with an angular size of 1.8 ◦ (level 5 HEALPix) and 29 unequally sized distance bins. Identifying the two DIBs at 862.1 nm (λ862.1) and 864.8 nm (λ864.8) in the stacked spectra, we modelled their shapes and report the depth, central wavelength, width, and equivalent width (EW) for each, along with confidence bounds on these measurements. We then explored the properties and distributions of these quantities and compared them with similar measurements from other surveys. Our main results are as follows: (1) the strength and spatial distribution of the DIBλ862.1 are very consistent with what was found in Gaia DR3, but for this work we attained a higher signal-to-noise ratio in the stacked spectra to larger distances, which allowed us to trace DIBs in the outer spiral arm and beyond the Scutum–Centaurus spiral arm; (2) we produced an all-sky map below ±65◦ of Galactic latitude to ∼4000 pc of both DIB features and their correlations; (3) we detected the signals of DIBλ862.1 inside the Local Bubble (≲200 pc); and (4) there is a reasonable correlation with the dust reddening found from stellar absorption and EWs of both DIBs with a correlation coefficient of 0.90 for λ862.1 and 0.77 for λ864.8.
publishDate 2023
dc.date.none.fl_str_mv 2023
2023-01-01
2023
2023-01-01
2024
2024-05-26
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/11268/12868
url http://hdl.handle.net/11268/12868
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:ABACUS. Repositorio de Producción Científica
instname:Universidad Europea (UEM)
instname_str Universidad Europea (UEM)
reponame_str ABACUS. Repositorio de Producción Científica
collection ABACUS. Repositorio de Producción Científica
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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