Anisotropic effective redshift and evolving clustering amplitude
| Title: | Anisotropic effective redshift and evolving clustering amplitude |
|---|---|
| Authors: | Obuljen, Andrej, Percival, Will J. |
| Publication Year: | 2021 |
| Collection: | Astrophysics |
| Subject Terms: | Astrophysics - Cosmology and Nongalactic Astrophysics |
| More Details: | A typical galaxy survey geometry results in galaxy pairs of different separation and angle to the line-of-sight having different distributions in redshift and consequently a different effective redshift. However, clustering measurements are analysed assuming that the clustering is representative of that at a single effective redshift. We investigate the impact of variations in the galaxy-pair effective redshift on the large-scale clustering measured in galaxy surveys. We find that galaxy surveys spanning a large redshift range have different effective redshifts as a function of both pair separation and angle. Furthermore, when considering tracers whose clustering amplitude evolves strongly with redshift, this combination can result in an additional scale-dependent clustering anisotropy. We demonstrate the size of this effect on the eBOSS DR16 Quasar sample and show that, while the impact on monopole is negligible, neglecting this effect can result in a large-scale tilt of $\sim 4\%$ and $\sim40\%$ in quadrupole and hexadecapole, respectively. We discuss strategies to mitigate this effect when making measurements. Comment: 7 pages, 7 figures. Comments welcome |
| Document Type: | Working Paper |
| DOI: | 10.1088/1475-7516/2021/11/006 |
| Access URL: | http://arxiv.org/abs/2104.07022 |
| Accession Number: | edsarx.2104.07022 |
| Database: | arXiv |
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| Items | – Name: Title Label: Title Group: Ti Data: Anisotropic effective redshift and evolving clustering amplitude – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Obuljen%2C+Andrej%22">Obuljen, Andrej</searchLink><br /><searchLink fieldCode="AR" term="%22Percival%2C+Will+J%2E%22">Percival, Will J.</searchLink> – Name: DatePubCY Label: Publication Year Group: Date Data: 2021 – Name: Subset Label: Collection Group: HoldingsInfo Data: Astrophysics – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Astrophysics+-+Cosmology+and+Nongalactic+Astrophysics%22">Astrophysics - Cosmology and Nongalactic Astrophysics</searchLink> – Name: Abstract Label: Description Group: Ab Data: A typical galaxy survey geometry results in galaxy pairs of different separation and angle to the line-of-sight having different distributions in redshift and consequently a different effective redshift. However, clustering measurements are analysed assuming that the clustering is representative of that at a single effective redshift. We investigate the impact of variations in the galaxy-pair effective redshift on the large-scale clustering measured in galaxy surveys. We find that galaxy surveys spanning a large redshift range have different effective redshifts as a function of both pair separation and angle. Furthermore, when considering tracers whose clustering amplitude evolves strongly with redshift, this combination can result in an additional scale-dependent clustering anisotropy. We demonstrate the size of this effect on the eBOSS DR16 Quasar sample and show that, while the impact on monopole is negligible, neglecting this effect can result in a large-scale tilt of $\sim 4\%$ and $\sim40\%$ in quadrupole and hexadecapole, respectively. We discuss strategies to mitigate this effect when making measurements.<br />Comment: 7 pages, 7 figures. Comments welcome – Name: TypeDocument Label: Document Type Group: TypDoc Data: Working Paper – Name: DOI Label: DOI Group: ID Data: 10.1088/1475-7516/2021/11/006 – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="http://arxiv.org/abs/2104.07022" linkWindow="_blank">http://arxiv.org/abs/2104.07022</link> – Name: AN Label: Accession Number Group: ID Data: edsarx.2104.07022 |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1088/1475-7516/2021/11/006 Subjects: – SubjectFull: Astrophysics - Cosmology and Nongalactic Astrophysics Type: general Titles: – TitleFull: Anisotropic effective redshift and evolving clustering amplitude Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Obuljen, Andrej – PersonEntity: Name: NameFull: Percival, Will J. IsPartOfRelationships: – BibEntity: Dates: – D: 14 M: 04 Type: published Y: 2021 |
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