Do we live in an under-dense region?
Descripción del Articulo
The authors thank Camila Novaes and Felipe Avila for insightful discussions and suggestions. EC acknowledges a fellowship of the CONCYTEC, the Peruvian agency for Science and Technology.
| Autores: | , |
|---|---|
| Formato: | artículo |
| Fecha de Publicación: | 2018 |
| Institución: | Consejo Nacional de Ciencia Tecnología e Innovación |
| Repositorio: | CONCYTEC-Institucional |
| Lenguaje: | inglés |
| OAI Identifier: | oai:repositorio.concytec.gob.pe:20.500.12390/552 |
| Enlace del recurso: | https://hdl.handle.net/20.500.12390/552 https://doi.org/10.1088/1742-6596/1143/1/012008 |
| Nivel de acceso: | acceso abierto |
| Materia: | Physics Cosmic background radiation Dense region Large-scales Limiting values Line sources Observational cosmology https://purl.org/pe-repo/ocde/ford#1.03.08 |
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| dc.title.none.fl_str_mv |
Do we live in an under-dense region? |
| title |
Do we live in an under-dense region? |
| spellingShingle |
Do we live in an under-dense region? Calcina E. Physics Cosmic background radiation Dense region Large-scales Limiting values Line sources Observational cosmology https://purl.org/pe-repo/ocde/ford#1.03.08 |
| title_short |
Do we live in an under-dense region? |
| title_full |
Do we live in an under-dense region? |
| title_fullStr |
Do we live in an under-dense region? |
| title_full_unstemmed |
Do we live in an under-dense region? |
| title_sort |
Do we live in an under-dense region? |
| author |
Calcina E. |
| author_facet |
Calcina E. Tello J.C. |
| author_role |
author |
| author2 |
Tello J.C. |
| author2_role |
author |
| dc.contributor.author.fl_str_mv |
Calcina E. Tello J.C. |
| dc.subject.none.fl_str_mv |
Physics |
| topic |
Physics Cosmic background radiation Dense region Large-scales Limiting values Line sources Observational cosmology https://purl.org/pe-repo/ocde/ford#1.03.08 |
| dc.subject.es_PE.fl_str_mv |
Cosmic background radiation Dense region Large-scales Limiting values Line sources Observational cosmology |
| dc.subject.ocde.none.fl_str_mv |
https://purl.org/pe-repo/ocde/ford#1.03.08 |
| description |
The authors thank Camila Novaes and Felipe Avila for insightful discussions and suggestions. EC acknowledges a fellowship of the CONCYTEC, the Peruvian agency for Science and Technology. |
| publishDate |
2018 |
| dc.date.accessioned.none.fl_str_mv |
2024-05-30T23:13:38Z |
| dc.date.available.none.fl_str_mv |
2024-05-30T23:13:38Z |
| dc.date.issued.fl_str_mv |
2018 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article |
| format |
article |
| dc.identifier.uri.none.fl_str_mv |
https://hdl.handle.net/20.500.12390/552 |
| dc.identifier.doi.none.fl_str_mv |
https://doi.org/10.1088/1742-6596/1143/1/012008 |
| dc.identifier.scopus.none.fl_str_mv |
2-s2.0-85059464264 |
| url |
https://hdl.handle.net/20.500.12390/552 https://doi.org/10.1088/1742-6596/1143/1/012008 |
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2-s2.0-85059464264 |
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eng |
| language |
eng |
| dc.relation.ispartof.none.fl_str_mv |
Journal of Physics: Conference Series |
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info:eu-repo/semantics/openAccess |
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https://creativecommons.org/licenses/by/3.0/ |
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openAccess |
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https://creativecommons.org/licenses/by/3.0/ |
| dc.publisher.none.fl_str_mv |
Institute of Physics Publishing |
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Institute of Physics Publishing |
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reponame:CONCYTEC-Institucional instname:Consejo Nacional de Ciencia Tecnología e Innovación instacron:CONCYTEC |
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Consejo Nacional de Ciencia Tecnología e Innovación |
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CONCYTEC |
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CONCYTEC |
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CONCYTEC-Institucional |
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CONCYTEC-Institucional |
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Repositorio Institucional CONCYTEC |
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repositorio@concytec.gob.pe |
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1844883062991618048 |
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Publicationrp00981600rp00980600Calcina E.Tello J.C.2024-05-30T23:13:38Z2024-05-30T23:13:38Z2018https://hdl.handle.net/20.500.12390/552https://doi.org/10.1088/1742-6596/1143/1/0120082-s2.0-85059464264The authors thank Camila Novaes and Felipe Avila for insightful discussions and suggestions. EC acknowledges a fellowship of the CONCYTEC, the Peruvian agency for Science and Technology.According to the Cosmological Principle, matter structures and radiation are expected to be homogeneously and isotropically distributed in the universe at sufficiently large scales. An open question in observational cosmology is to estimate the size of such scale from the data. In the case of the cosmic background radiation, it seems clear that such scale corresponds to the horizon scale at matter-radiation decoupling, that is, at ∼ 1°, but the problem is still open for the size of the homogeneity scale. But, due to the growth of structures in the evolving universe the homogeneity scale depends on the redshift of the data in analyses. Here we study this problem for data in the local universe by analyzing the 21cm HI-line sources using the public catalog ALFALFA, with median redshift 〈z〉 = 0.025. We use the scaled counts-in-spheres method to establish the approximate size of the homogeneity scale in the local universe. In this analysis one compares the data sample with respect to a randomly generated homogenous sample. Defining the scale of transition to homogeneity as the scale at which the scaled counts-in-spheres estimator reaches the limiting value 1 within 1%, we find that this transition scale is rH ≃ 69 Mpc, in excellent accordance with what is expected considering that the HI-line sources come from low-mass blue galaxies which have an anti-bias b with respect to the matter fluctuation field (with b ≃ 0.48 − 0.68 depending on the composition of the sample), from which one expects a transition scale in the local universe of 56 < rH < 79 Mpc.Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica - ConcytecengInstitute of Physics PublishingJournal of Physics: Conference Seriesinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/3.0/PhysicsCosmic background radiation-1Dense region-1Large-scales-1Limiting values-1Line sources-1Observational cosmology-1https://purl.org/pe-repo/ocde/ford#1.03.08-1Do we live in an under-dense region?info:eu-repo/semantics/articlereponame:CONCYTEC-Institucionalinstname:Consejo Nacional de Ciencia Tecnología e Innovacióninstacron:CONCYTEC#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#20.500.12390/552oai:repositorio.concytec.gob.pe:20.500.12390/5522024-05-30 15:35:43.882https://creativecommons.org/licenses/by/3.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_14cbinfo:eu-repo/semantics/closedAccessmetadata only accesshttps://repositorio.concytec.gob.peRepositorio Institucional CONCYTECrepositorio@concytec.gob.pe#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#<Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="20d51c33-5a9e-48e5-844a-1074154e0093"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Do we live in an under-dense region?</Title> <PublishedIn> <Publication> <Title>Journal of Physics: Conference Series</Title> </Publication> </PublishedIn> <PublicationDate>2018</PublicationDate> <DOI>https://doi.org/10.1088/1742-6596/1143/1/012008</DOI> <SCP-Number>2-s2.0-85059464264</SCP-Number> <Authors> <Author> <DisplayName>Calcina E.</DisplayName> <Person id="rp00981" /> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> <Author> <DisplayName>Tello J.C.</DisplayName> <Person id="rp00980" /> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Institute of Physics Publishing</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>https://creativecommons.org/licenses/by/3.0/</License> <Keyword>Physics</Keyword> <Keyword>Cosmic background radiation</Keyword> <Keyword>Dense region</Keyword> <Keyword>Large-scales</Keyword> <Keyword>Limiting values</Keyword> <Keyword>Line sources</Keyword> <Keyword>Observational cosmology</Keyword> <Abstract>According to the Cosmological Principle, matter structures and radiation are expected to be homogeneously and isotropically distributed in the universe at sufficiently large scales. An open question in observational cosmology is to estimate the size of such scale from the data. In the case of the cosmic background radiation, it seems clear that such scale corresponds to the horizon scale at matter-radiation decoupling, that is, at ∼ 1°, but the problem is still open for the size of the homogeneity scale. But, due to the growth of structures in the evolving universe the homogeneity scale depends on the redshift of the data in analyses. Here we study this problem for data in the local universe by analyzing the 21cm HI-line sources using the public catalog ALFALFA, with median redshift 〈z〉 = 0.025. We use the scaled counts-in-spheres method to establish the approximate size of the homogeneity scale in the local universe. In this analysis one compares the data sample with respect to a randomly generated homogenous sample. Defining the scale of transition to homogeneity as the scale at which the scaled counts-in-spheres estimator reaches the limiting value 1 within 1%, we find that this transition scale is rH ≃ 69 Mpc, in excellent accordance with what is expected considering that the HI-line sources come from low-mass blue galaxies which have an anti-bias b with respect to the matter fluctuation field (with b ≃ 0.48 − 0.68 depending on the composition of the sample), from which one expects a transition scale in the local universe of 56 < rH < 79 Mpc.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication> -1 |
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13.36089 |
Nota importante:
La información contenida en este registro es de entera responsabilidad de la institución que gestiona el repositorio institucional donde esta contenido este documento o set de datos. El CONCYTEC no se hace responsable por los contenidos (publicaciones y/o datos) accesibles a través del Repositorio Nacional Digital de Ciencia, Tecnología e Innovación de Acceso Abierto (ALICIA).
La información contenida en este registro es de entera responsabilidad de la institución que gestiona el repositorio institucional donde esta contenido este documento o set de datos. El CONCYTEC no se hace responsable por los contenidos (publicaciones y/o datos) accesibles a través del Repositorio Nacional Digital de Ciencia, Tecnología e Innovación de Acceso Abierto (ALICIA).
