{"id":"https://openalex.org/W7213579237","doi":"https://doi.org/10.48550/arxiv.2609.19276","title":"Generalised Visibility ILC: a new foreground mitigation strategy for interferometric HI intensity mapping in the low-redshift Universe","display_name":"Generalised Visibility ILC: a new foreground mitigation strategy for interferometric HI intensity mapping in the low-redshift Universe","publication_year":2026,"publication_date":"2026-09-16","ids":{"openalex":"https://openalex.org/W7213579237","doi":"https://doi.org/10.48550/arxiv.2609.19276"},"language":"en","primary_location":{"id":"pmh:oai:arXiv.org:2609.19276","doi":null,"is_oa":true,"landing_page_url":"https://arxiv.org/abs/2609.19276","pdf_url":"https://arxiv.org/pdf/2609.19276","source":{"id":"https://openalex.org/S4306400194","display_name":"arXiv (Cornell University)","issn_l":"2331-8422","issn":["2331-8422"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I205783295","host_organization_name":"Cornell University","host_organization_lineage":["https://openalex.org/I205783295"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"text"},"volume":null,"type":"preprint","is_traditional":true,"indexed_in":["arxiv","datacite"],"open_access":{"is_oa":true,"oa_status":"green","oa_url":"https://arxiv.org/pdf/2609.19276","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5023283258","display_name":"Miguel Ruiz-Granda","orcid":"https://orcid.org/0000-0003-2086-0043","observed_orcids":["https://orcid.org/0000-0003-2086-0043"]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"Ruiz-Granda, M.","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5085555373","display_name":"Aishrila Mazumder","orcid":"https://orcid.org/0000-0003-3461-496X","observed_orcids":["https://orcid.org/0000-0003-3461-496X"]},"institutions":[{"id":"https://openalex.org/I2799714274","display_name":"Shanghai Astronomical Observatory","ror":"https://ror.org/003n8re58","country_code":"CN","type":"facility","lineage":["https://openalex.org/I19820366","https://openalex.org/I2799714274"]},{"id":"https://openalex.org/I28407311","display_name":"University of Manchester","ror":"https://ror.org/027m9bs27","country_code":"GB","type":"education","lineage":["https://openalex.org/I28407311"]}],"countries":["CN","GB"],"is_corresponding":false,"raw_author_name":"Mazumder, A.","raw_affiliation_strings":["Jodrell Bank Centre for Astrophysics , Department of Physics and Astronomy , The University of Manchester , Manchester M13 9PL , UK","State Key Laboratory of Radio Astronomy and Technology , Shanghai Astronomical Observatory , CAS , 80 Nandan Road , Shanghai 200030 , China"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Jodrell Bank Centre for Astrophysics , Department of Physics and Astronomy , The University of Manchester , Manchester M13 9PL , UK","institution_ids":["https://openalex.org/I28407311"]},{"raw_affiliation_string":"State Key Laboratory of Radio Astronomy and Technology , Shanghai Astronomical Observatory , CAS , 80 Nandan Road , Shanghai 200030 , China","institution_ids":["https://openalex.org/I2799714274"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5042054802","display_name":"Laura Wolz","orcid":"https://orcid.org/0000-0003-3334-3037","observed_orcids":["https://orcid.org/0000-0003-3334-3037"]},"institutions":[{"id":"https://openalex.org/I28407311","display_name":"University of Manchester","ror":"https://ror.org/027m9bs27","country_code":"GB","type":"education","lineage":["https://openalex.org/I28407311"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"Wolz, L.","raw_affiliation_strings":["Jodrell Bank Centre for Astrophysics , Department of Physics and Astronomy , The University of Manchester , Manchester M13 9PL , UK"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Jodrell Bank Centre for Astrophysics , Department of Physics and Astronomy , The University of Manchester , Manchester M13 9PL , UK","institution_ids":["https://openalex.org/I28407311"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5065379276","display_name":"Mathieu Remazeilles","orcid":"https://orcid.org/0000-0001-9126-6266","observed_orcids":["https://orcid.org/0000-0001-9126-6266"]},"institutions":[{"id":"https://openalex.org/I13134134","display_name":"Universidad de Cantabria","ror":"https://ror.org/046ffzj20","country_code":"ES","type":"education","lineage":["https://openalex.org/I13134134"]},{"id":"https://openalex.org/I4210152024","display_name":"Instituto de F\u00edsica de Cantabria","ror":"https://ror.org/040kx1j83","country_code":"ES","type":"facility","lineage":["https://openalex.org/I13134134","https://openalex.org/I134820265","https://openalex.org/I4210152024"]}],"countries":["ES"],"is_corresponding":false,"raw_author_name":"Remazeilles, M.","raw_affiliation_strings":["Instituto de F\u00edsica de Cantabria ( CSIC-Universidad de Cantabria) , Avda. de los Castros s/n , E-39005 Santander , Spain"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Instituto de F\u00edsica de Cantabria ( CSIC-Universidad de Cantabria) , Avda. de los Castros s/n , E-39005 Santander , Spain","institution_ids":["https://openalex.org/I13134134","https://openalex.org/I4210152024"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5004381931","display_name":"D. Herranz","orcid":"https://orcid.org/0000-0003-4540-1417","observed_orcids":["https://orcid.org/0000-0003-4540-1417"]},"institutions":[{"id":"https://openalex.org/I13134134","display_name":"Universidad de Cantabria","ror":"https://ror.org/046ffzj20","country_code":"ES","type":"education","lineage":["https://openalex.org/I13134134"]},{"id":"https://openalex.org/I4210152024","display_name":"Instituto de F\u00edsica de Cantabria","ror":"https://ror.org/040kx1j83","country_code":"ES","type":"facility","lineage":["https://openalex.org/I13134134","https://openalex.org/I134820265","https://openalex.org/I4210152024"]}],"countries":["ES"],"is_corresponding":false,"raw_author_name":"Herranz, D.","raw_affiliation_strings":["Dpto. de F\u00edsica Moderna , Universidad de Cantabria , Avda. los Castros s/n , E-39005 Santander , Spain","Instituto de F\u00edsica de Cantabria ( CSIC-Universidad de Cantabria) , Avda. de los Castros s/n , E-39005 Santander , Spain"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Dpto. de F\u00edsica Moderna , Universidad de Cantabria , Avda. los Castros s/n , E-39005 Santander , Spain","institution_ids":["https://openalex.org/I13134134"]},{"raw_affiliation_string":"Instituto de F\u00edsica de Cantabria ( CSIC-Universidad de Cantabria) , Avda. de los Castros s/n , E-39005 Santander , Spain","institution_ids":["https://openalex.org/I13134134","https://openalex.org/I4210152024"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5034218569","display_name":"Patricio Vielva","orcid":"https://orcid.org/0000-0003-0051-272X","observed_orcids":["https://orcid.org/0000-0003-0051-272X"]},"institutions":[{"id":"https://openalex.org/I13134134","display_name":"Universidad de Cantabria","ror":"https://ror.org/046ffzj20","country_code":"ES","type":"education","lineage":["https://openalex.org/I13134134"]},{"id":"https://openalex.org/I4210152024","display_name":"Instituto de F\u00edsica de Cantabria","ror":"https://ror.org/040kx1j83","country_code":"ES","type":"facility","lineage":["https://openalex.org/I13134134","https://openalex.org/I134820265","https://openalex.org/I4210152024"]}],"countries":["ES"],"is_corresponding":false,"raw_author_name":"Vielva, P.","raw_affiliation_strings":["Instituto de F\u00edsica de Cantabria ( CSIC-Universidad de Cantabria) , Avda. de los Castros s/n , E-39005 Santander , Spain"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Instituto de F\u00edsica de Cantabria ( CSIC-Universidad de Cantabria) , Avda. de los Castros s/n , E-39005 Santander , Spain","institution_ids":["https://openalex.org/I13134134","https://openalex.org/I4210152024"]}]}],"institutions":[],"countries_distinct_count":3,"institutions_distinct_count":4,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":null,"has_fulltext":true,"cited_by_count":0,"citation_normalized_percentile":null,"cited_by_percentile_year":null,"biblio":{"volume":null,"issue":null,"first_page":null,"last_page":null},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T12450","display_name":"Radio Astronomy Observations and Technology","score":0.9922000169754028,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T12450","display_name":"Radio Astronomy Observations and Technology","score":0.9922000169754028,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10095","display_name":"Cosmology and Gravitation Theories","score":0.0034000000450760126,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10026","display_name":"Galaxies: Formation, Evolution, Phenomena","score":0.00139999995008111,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/hi-intensity-mapping","display_name":"HI intensity mapping","score":0.9829999804496765},{"id":"https://openalex.org/keywords/foreground-mitigation","display_name":"foreground mitigation","score":0.8650000095367432},{"id":"https://openalex.org/keywords/internal-linear-combination","display_name":"internal linear combination","score":0.8970000147819519},{"id":"https://openalex.org/keywords/principal-component-analysis","display_name":"principal component analysis","score":0.9129999876022339},{"id":"https://openalex.org/keywords/meerkat","display_name":"MeerKAT","score":0.7870000004768372},{"id":"https://openalex.org/keywords/ska-mid","display_name":"SKA-Mid","score":0.9909999966621399},{"id":"https://openalex.org/keywords/low-redshift-universe","display_name":"low-redshift universe","score":0.8080000281333923},{"id":"https://openalex.org/keywords/neutral-hydrogen","display_name":"neutral hydrogen","score":0.5680000185966492},{"id":"https://openalex.org/keywords/signal-loss","display_name":"signal loss","score":0.3540000021457672}],"concepts":[{"id":"https://openalex.org/C2777967070","wikidata":"https://www.wikidata.org/wiki/Q18208114","display_name":"Intensity mapping","level":4,"score":0.7748000025749207},{"id":"https://openalex.org/C123403432","wikidata":"https://www.wikidata.org/wiki/Q654068","display_name":"Visibility","level":2,"score":0.728600025177002},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.7053999900817871},{"id":"https://openalex.org/C166689943","wikidata":"https://www.wikidata.org/wiki/Q850283","display_name":"Interferometry","level":2,"score":0.6207000017166138},{"id":"https://openalex.org/C93038891","wikidata":"https://www.wikidata.org/wiki/Q1061524","display_name":"Intensity (physics)","level":2,"score":0.521399974822998},{"id":"https://openalex.org/C2779843651","wikidata":"https://www.wikidata.org/wiki/Q7390335","display_name":"SIGNAL (programming language)","level":2,"score":0.5148000121116638},{"id":"https://openalex.org/C164918935","wikidata":"https://www.wikidata.org/wiki/Q1406191","display_name":"Hydrogen line","level":3,"score":0.4569999873638153},{"id":"https://openalex.org/C32834561","wikidata":"https://www.wikidata.org/wiki/Q660730","display_name":"Subspace topology","level":2,"score":0.42100000381469727},{"id":"https://openalex.org/C120665830","wikidata":"https://www.wikidata.org/wiki/Q14620","display_name":"Optics","level":1,"score":0.41440001130104065},{"id":"https://openalex.org/C155512373","wikidata":"https://www.wikidata.org/wiki/Q287450","display_name":"Residual","level":2,"score":0.3702999949455261},{"id":"https://openalex.org/C27438332","wikidata":"https://www.wikidata.org/wiki/Q2873","display_name":"Principal component analysis","level":2,"score":0.3652999997138977},{"id":"https://openalex.org/C125245961","wikidata":"https://www.wikidata.org/wiki/Q221656","display_name":"Brightness","level":2,"score":0.3467000126838684},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.34459999203681946},{"id":"https://openalex.org/C104267543","wikidata":"https://www.wikidata.org/wiki/Q208163","display_name":"Signal processing","level":3,"score":0.3264000117778778},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.3052999973297119},{"id":"https://openalex.org/C102519508","wikidata":"https://www.wikidata.org/wiki/Q6520159","display_name":"Fourier transform","level":2,"score":0.298799991607666},{"id":"https://openalex.org/C2777121530","wikidata":"https://www.wikidata.org/wiki/Q7512739","display_name":"Signal subspace","level":4,"score":0.29809999465942383},{"id":"https://openalex.org/C89128539","wikidata":"https://www.wikidata.org/wiki/Q1949963","display_name":"Statistic","level":2,"score":0.2955999970436096},{"id":"https://openalex.org/C203024314","wikidata":"https://www.wikidata.org/wiki/Q1365258","display_name":"Fourier analysis","level":3,"score":0.26089999079704285},{"id":"https://openalex.org/C198352243","wikidata":"https://www.wikidata.org/wiki/Q37105","display_name":"Line (geometry)","level":2,"score":0.26030001044273376},{"id":"https://openalex.org/C2778572836","wikidata":"https://www.wikidata.org/wiki/Q380933","display_name":"Space (punctuation)","level":2,"score":0.2567000091075897},{"id":"https://openalex.org/C28719098","wikidata":"https://www.wikidata.org/wiki/Q44946","display_name":"Point (geometry)","level":2,"score":0.2563999891281128}],"mesh":[],"locations_count":2,"locations":[{"id":"pmh:oai:arXiv.org:2609.19276","doi":null,"is_oa":true,"landing_page_url":"https://arxiv.org/abs/2609.19276","pdf_url":"https://arxiv.org/pdf/2609.19276","source":{"id":"https://openalex.org/S4306400194","display_name":"arXiv (Cornell University)","issn_l":"2331-8422","issn":["2331-8422"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I205783295","host_organization_name":"Cornell University","host_organization_lineage":["https://openalex.org/I205783295"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"text"},{"id":"doi:10.48550/arxiv.2609.19276","doi":"https://doi.org/10.48550/arxiv.2609.19276","is_oa":true,"landing_page_url":"https://doi.org/10.48550/arxiv.2609.19276","pdf_url":null,"source":{"id":"https://openalex.org/S4306400194","display_name":"arXiv (Cornell University)","issn_l":"2331-8422","issn":["2331-8422"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I205783295","host_organization_name":"Cornell University","host_organization_lineage":["https://openalex.org/I205783295"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":null,"is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"Preprint"}],"best_oa_location":{"id":"pmh:oai:arXiv.org:2609.19276","doi":null,"is_oa":true,"landing_page_url":"https://arxiv.org/abs/2609.19276","pdf_url":"https://arxiv.org/pdf/2609.19276","source":{"id":"https://openalex.org/S4306400194","display_name":"arXiv (Cornell University)","issn_l":"2331-8422","issn":["2331-8422"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I205783295","host_organization_name":"Cornell University","host_organization_lineage":["https://openalex.org/I205783295"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"text"},"sustainable_development_goals":[],"study_designs":[],"awards":[{"id":"https://openalex.org/G3573476267","display_name":null,"funder_award_id":"MR/V026437/1","funder_id":"https://openalex.org/F4320314731","funder_display_name":"UK Research and Innovation"},{"id":"https://openalex.org/G4212894969","display_name":null,"funder_award_id":"PID2022","funder_id":"https://openalex.org/F4320315062","funder_display_name":"Ministerio de Ciencia, Innovaci\u00f3n y Universidades"},{"id":"https://openalex.org/G4983699714","display_name":null,"funder_award_id":"PID2022-140670NA-I00","funder_id":"https://openalex.org/F4320335598","funder_display_name":"Agencia Estatal de Investigaci\u00f3n"}],"funders":[{"id":"https://openalex.org/F4320314731","display_name":"UK Research and Innovation","ror":"https://ror.org/001aqnf71"},{"id":"https://openalex.org/F4320315062","display_name":"Ministerio de Ciencia, Innovaci\u00f3n y Universidades","ror":null},{"id":"https://openalex.org/F4320323808","display_name":"Universidad de Cantabria","ror":"https://ror.org/046ffzj20"},{"id":"https://openalex.org/F4320330797","display_name":"Instituto de F\u00edsica de Cantabria","ror":"https://ror.org/040kx1j83"},{"id":"https://openalex.org/F4320335598","display_name":"Agencia Estatal de Investigaci\u00f3n","ror":"https://ror.org/003x0zc53"}],"has_content":{"grobid_xml":true,"pdf":true},"content_urls":{"pdf":"https://content.openalex.org/works/W7213579237.pdf","grobid_xml":"https://content.openalex.org/works/W7213579237.grobid-xml"},"referenced_works_count":10,"referenced_works":["https://openalex.org/W1633529777","https://openalex.org/W2109431240","https://openalex.org/W2760594049","https://openalex.org/W2802851734","https://openalex.org/W3013506520","https://openalex.org/W7131856231","https://openalex.org/W7162522154","https://openalex.org/W7211907319","https://openalex.org/W7214581596","https://openalex.org/W7214638225"],"related_works":["https://openalex.org/W7106122585","https://openalex.org/W4308840606","https://openalex.org/W2800403440","https://openalex.org/W1813624723","https://openalex.org/W4396954178","https://openalex.org/W4416926511","https://openalex.org/W3092086754","https://openalex.org/W3210133581","https://openalex.org/W1780809794","https://openalex.org/W1482620924"],"abstract_inverted_index":{"HI":[0,52,86,103,132,186,195,230],"intensity":[1,53,231],"mapping":[2,54,232],"is":[3,22,117,221],"a":[4,42,84,91,120,183],"powerful":[5],"probe":[6],"of":[7,13,27,110,145,211,240,247],"the":[8,14,25,29,102,115,146,174,209,238],"large-scale":[9],"matter":[10],"distribution":[11],"and":[12,17,55,61,100,169,191,196],"underlying":[15],"astrophysics":[16],"cosmology.":[18],"However,":[19],"its":[20],"application":[21],"limited":[23,131],"by":[24,83,157,214],"challenge":[26],"separating":[28],"faint":[30],"neutral":[31],"hydrogen":[32],"(HI)":[33],"signal":[34,104,133,147,202],"from":[35,243],"much":[36],"brighter":[37],"foreground":[38,79,127,140,175,205,227],"emission.":[39],"We":[40,179],"present":[41],"new":[43],"non-parametric":[44],"foreground-cleaning":[45],"method":[46,72,224],"in":[47,94,114,137,229],"visibility":[48,95],"space":[49,96],"for":[50,78,166],"low-redshift":[51],"apply":[56],"it":[57],"to":[58,97,112,125,200,225],"interferometric":[59,235],"MeerKAT":[60,168],"SKA-Mid-like":[62,170],"simulations.":[63],"Our":[64],"newly-developed":[65],"Generalised":[66],"Visibility":[67],"Internal":[68],"Linear":[69],"Combination":[70],"(GVILC)":[71],"combines":[73],"Principal":[74],"Component":[75],"Analysis":[76],"(PCA)":[77],"subspace":[80],"identification,":[81],"informed":[82],"prior":[85],"signal-plus-noise":[87],"covariance":[88],"matrix,":[89],"with":[90,105,130,139,188,233],"multi-dimensional":[92],"ILC":[93],"suppress":[98],"foregrounds":[99],"recover":[101],"reduced":[106],"contamination.":[107],"The":[108,159],"number":[109,210],"modes":[111,152,212],"remove":[113],"PCA":[116],"calculated":[118],"using":[119],"data-driven":[121],"statistical":[122],"approach,":[123],"leading":[124],"significant":[126],"residual":[128],"suppression":[129],"loss.":[134],"Moreover,":[135],"GVILC":[136,172,220],"combination":[138],"avoidance":[141,176],"can":[142],"prevent":[143],"most":[144],"loss,":[148],"while":[149],"simultaneously":[150],"recovering":[151],"that":[153,165,181,219],"were":[154],"initially":[155],"contaminated":[156],"foregrounds.":[158],"mean":[160],"squared":[161],"error":[162],"statistic":[163],"shows":[164],"both":[167],"simulations,":[171],"outperforms":[173],"only":[177],"strategy.":[178],"find":[180],"including":[182],"more":[184],"realistic":[185],"model":[187],"line":[189],"broadening":[190],"spatial":[192],"correlations":[193],"between":[194],"continuum":[197],"sources":[198],"leads":[199],"increased":[201],"loss":[203],"after":[204],"removal,":[206],"without":[207],"affecting":[208],"removed":[213],"GVILC.":[215],"This":[216],"paper":[217],"demonstrates":[218],"an":[222],"effective":[223],"clean":[226],"contamination":[228],"radio":[234],"data,":[236],"enabling":[237],"recovery":[239],"cosmological":[241],"information":[242],"previously":[244],"inaccessible":[245],"regions":[246],"Fourier":[248],"space.":[249]},"counts_by_year":[],"updated_date":"2026-11-07T11:25:07.637180","created_date":"2026-09-19T00:00:00"}