Validation of the DESI 2024 Lyman alpha forest BAL masking strategy
Broad absorption line quasars (BALs) exhibit blueshifted absorption relative to a number of their prominent broad emission features. These absorption features can contribute to quasar redshift errors and add absorption to the Lyman-a (Lya) forest that is unrelated to large-scale structure. We presen...
| Autores: | , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/439352 |
| Acceso en línea: | https://hdl.handle.net/2117/439352 https://dx.doi.org/10.1088/1475-7516/2025/01/137 |
| Access Level: | acceso abierto |
| Palabra clave: | Baryon acoustic oscillations Dark energy experiments Lyman alpha forest Àrees temàtiques de la UPC::Física::Astronomia i astrofísica |
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Validation of the DESI 2024 Lyman alpha forest BAL masking strategyMartini, PaulCuceu, Andrei|||0000-0002-2169-0595Ennesser, Lauren|||0000-0002-9501-8769Brodzeller, Allyson|||0000-0002-8934-0954Aguilar, Jessica NicoleAhlen, StevenBrooks, DavidClaybaugh, ToddPérez Ràfols, Ignasi|||0000-0001-6979-0125Baryon acoustic oscillationsDark energy experimentsLyman alpha forestÀrees temàtiques de la UPC::Física::Astronomia i astrofísicaBroad absorption line quasars (BALs) exhibit blueshifted absorption relative to a number of their prominent broad emission features. These absorption features can contribute to quasar redshift errors and add absorption to the Lyman-a (Lya) forest that is unrelated to large-scale structure. We present a detailed analysis of the impact of BALs on the Baryon Acoustic Oscillation (BAO) results with the Lya forest from the first year of data from the Dark Energy Spectroscopic Instrument (DESI). The baseline strategy for the first year analysis is to mask all pixels associated with all BAL absorption features that fall within the wavelength region used to measure the forest. We explore a range of alternate masking strategies and demonstrate that these changes have minimal impact on the BAO measurements with both DESI data and synthetic data. This includes when we mask the BAL features associated with emission lines outside of the forest region to minimize their contribution to redshift errors. We identify differences in the properties of BALs in the synthetic datasets relative to the observational data, as well as use the synthetic observations to characterize the completeness of the BAL identification algorithm, and demonstrate that incompleteness and differences in the BALs between real and synthetic data also do not impact the BAO results for the Lya forest.Peer ReviewedIOP Publishing20252025-01-3020252025-07-24journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/439352https://dx.doi.org/10.1088/1475-7516/2025/01/137reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/4393522026-05-27T15:37:01Z |
| dc.title.none.fl_str_mv |
Validation of the DESI 2024 Lyman alpha forest BAL masking strategy |
| title |
Validation of the DESI 2024 Lyman alpha forest BAL masking strategy |
| spellingShingle |
Validation of the DESI 2024 Lyman alpha forest BAL masking strategy Martini, Paul Baryon acoustic oscillations Dark energy experiments Lyman alpha forest Àrees temàtiques de la UPC::Física::Astronomia i astrofísica |
| title_short |
Validation of the DESI 2024 Lyman alpha forest BAL masking strategy |
| title_full |
Validation of the DESI 2024 Lyman alpha forest BAL masking strategy |
| title_fullStr |
Validation of the DESI 2024 Lyman alpha forest BAL masking strategy |
| title_full_unstemmed |
Validation of the DESI 2024 Lyman alpha forest BAL masking strategy |
| title_sort |
Validation of the DESI 2024 Lyman alpha forest BAL masking strategy |
| dc.creator.none.fl_str_mv |
Martini, Paul Cuceu, Andrei|||0000-0002-2169-0595 Ennesser, Lauren|||0000-0002-9501-8769 Brodzeller, Allyson|||0000-0002-8934-0954 Aguilar, Jessica Nicole Ahlen, Steven Brooks, David Claybaugh, Todd Pérez Ràfols, Ignasi|||0000-0001-6979-0125 |
| author |
Martini, Paul |
| author_facet |
Martini, Paul Cuceu, Andrei|||0000-0002-2169-0595 Ennesser, Lauren|||0000-0002-9501-8769 Brodzeller, Allyson|||0000-0002-8934-0954 Aguilar, Jessica Nicole Ahlen, Steven Brooks, David Claybaugh, Todd Pérez Ràfols, Ignasi|||0000-0001-6979-0125 |
| author_role |
author |
| author2 |
Cuceu, Andrei|||0000-0002-2169-0595 Ennesser, Lauren|||0000-0002-9501-8769 Brodzeller, Allyson|||0000-0002-8934-0954 Aguilar, Jessica Nicole Ahlen, Steven Brooks, David Claybaugh, Todd Pérez Ràfols, Ignasi|||0000-0001-6979-0125 |
| author2_role |
author author author author author author author author |
| dc.subject.none.fl_str_mv |
Baryon acoustic oscillations Dark energy experiments Lyman alpha forest Àrees temàtiques de la UPC::Física::Astronomia i astrofísica |
| topic |
Baryon acoustic oscillations Dark energy experiments Lyman alpha forest Àrees temàtiques de la UPC::Física::Astronomia i astrofísica |
| description |
Broad absorption line quasars (BALs) exhibit blueshifted absorption relative to a number of their prominent broad emission features. These absorption features can contribute to quasar redshift errors and add absorption to the Lyman-a (Lya) forest that is unrelated to large-scale structure. We present a detailed analysis of the impact of BALs on the Baryon Acoustic Oscillation (BAO) results with the Lya forest from the first year of data from the Dark Energy Spectroscopic Instrument (DESI). The baseline strategy for the first year analysis is to mask all pixels associated with all BAL absorption features that fall within the wavelength region used to measure the forest. We explore a range of alternate masking strategies and demonstrate that these changes have minimal impact on the BAO measurements with both DESI data and synthetic data. This includes when we mask the BAL features associated with emission lines outside of the forest region to minimize their contribution to redshift errors. We identify differences in the properties of BALs in the synthetic datasets relative to the observational data, as well as use the synthetic observations to characterize the completeness of the BAL identification algorithm, and demonstrate that incompleteness and differences in the BALs between real and synthetic data also do not impact the BAO results for the Lya forest. |
| publishDate |
2025 |
| dc.date.none.fl_str_mv |
2025 2025-01-30 2025 2025-07-24 |
| dc.type.none.fl_str_mv |
journal article http://purl.org/coar/resource_type/c_6501 VoR http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
| format |
article |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/2117/439352 https://dx.doi.org/10.1088/1475-7516/2025/01/137 |
| url |
https://hdl.handle.net/2117/439352 https://dx.doi.org/10.1088/1475-7516/2025/01/137 |
| 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 4.0 International http://creativecommons.org/licenses/by/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 4.0 International http://creativecommons.org/licenses/by/4.0/ |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
application/pdf |
| dc.publisher.none.fl_str_mv |
IOP Publishing |
| publisher.none.fl_str_mv |
IOP Publishing |
| dc.source.none.fl_str_mv |
reponame:UPCommons. Portal del coneixement obert de la UPC instname:Universitat Politècnica de Catalunya (UPC) |
| instname_str |
Universitat Politècnica de Catalunya (UPC) |
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UPCommons. Portal del coneixement obert de la UPC |
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UPCommons. Portal del coneixement obert de la UPC |
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| repository.mail.fl_str_mv |
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1869410012186542080 |
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15,81155 |