Constraints on the richness–mass relation and the optical-SZE positional offset distribution for SZE-selected clusters
We cross-match galaxy cluster candidates selected via their Sunyaev–Zel'dovich effect (SZE) signatures in 129.1 deg[superscript 2] of the South Pole Telescope 2500d SPT-SZ survey with optically identified clusters selected from the Dark Energy Survey science verification data. We identify 25 cl...
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| Format: | Article |
| Language: | en_US |
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Oxford University Press
2017
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| Online Access: | http://hdl.handle.net/1721.1/108814 https://orcid.org/0000-0001-5226-8349 |
| _version_ | 1811098192252502016 |
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| author | McDonald, Michael A. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics McDonald, Michael A. |
| author_sort | McDonald, Michael A. |
| collection | MIT |
| description | We cross-match galaxy cluster candidates selected via their Sunyaev–Zel'dovich effect (SZE) signatures in 129.1 deg[superscript 2] of the South Pole Telescope 2500d SPT-SZ survey with optically identified clusters selected from the Dark Energy Survey science verification data. We identify 25 clusters between 0.1 ≲ z ≲ 0.8 in the union of the SPT-SZ and redMaPPer (RM) samples. RM is an optical cluster finding algorithm that also returns a richness estimate for each cluster. We model the richness λ-mass relation with the following function 〈ln λ|M500〉 ∝ Bλln M500 + Cλln E(z) and use SPT-SZ cluster masses and RM richnesses λ to constrain the parameters. We find Bλ=1.14[superscript +0.21][subscript −0.18 and
Cλ=0.73[superscript +0.77][subscript −0.75]. The associated scatter in mass at fixed richness is σlnM|λ=0.18[superscript +0.08][subscript −0.05] at a characteristic richness λ = 70. We demonstrate that our model provides an adequate description of the matched sample, showing that the fraction of SPT-SZ-selected clusters with RM counterparts is consistent with expectations and that the fraction of RM-selected clusters with SPT-SZ counterparts is in mild tension with expectation. We model the optical-SZE cluster positional offset distribution with the sum of two Gaussians, showing that it is consistent with a dominant, centrally peaked population and a subdominant population characterized by larger offsets. We also cross-match the RM catalogue with SPT-SZ candidates below the official catalogue threshold significance ξ = 4.5, using the RM catalogue to provide optical confirmation and redshifts for 15 additional clusters with ξ ∈ [4, 4.5]. |
| first_indexed | 2024-09-23T17:11:21Z |
| format | Article |
| id | mit-1721.1/108814 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T17:11:21Z |
| publishDate | 2017 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | mit-1721.1/1088142022-09-30T00:18:44Z Constraints on the richness–mass relation and the optical-SZE positional offset distribution for SZE-selected clusters McDonald, Michael A. Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research McDonald, Michael A. We cross-match galaxy cluster candidates selected via their Sunyaev–Zel'dovich effect (SZE) signatures in 129.1 deg[superscript 2] of the South Pole Telescope 2500d SPT-SZ survey with optically identified clusters selected from the Dark Energy Survey science verification data. We identify 25 clusters between 0.1 ≲ z ≲ 0.8 in the union of the SPT-SZ and redMaPPer (RM) samples. RM is an optical cluster finding algorithm that also returns a richness estimate for each cluster. We model the richness λ-mass relation with the following function 〈ln λ|M500〉 ∝ Bλln M500 + Cλln E(z) and use SPT-SZ cluster masses and RM richnesses λ to constrain the parameters. We find Bλ=1.14[superscript +0.21][subscript −0.18 and Cλ=0.73[superscript +0.77][subscript −0.75]. The associated scatter in mass at fixed richness is σlnM|λ=0.18[superscript +0.08][subscript −0.05] at a characteristic richness λ = 70. We demonstrate that our model provides an adequate description of the matched sample, showing that the fraction of SPT-SZ-selected clusters with RM counterparts is consistent with expectations and that the fraction of RM-selected clusters with SPT-SZ counterparts is in mild tension with expectation. We model the optical-SZE cluster positional offset distribution with the sum of two Gaussians, showing that it is consistent with a dominant, centrally peaked population and a subdominant population characterized by larger offsets. We also cross-match the RM catalogue with SPT-SZ candidates below the official catalogue threshold significance ξ = 4.5, using the RM catalogue to provide optical confirmation and redshifts for 15 additional clusters with ξ ∈ [4, 4.5]. Kavli Foundation Gordon and Betty Moore Foundation (Grant GBMF 947) 2017-05-11T16:32:13Z 2017-05-11T16:32:13Z 2015-10 Article http://purl.org/eprint/type/JournalArticle 0035-8711 1365-2966 http://hdl.handle.net/1721.1/108814 Saro, A. et al. “Constraints on the Richness–mass Relation and the Optical-SZE Positional Offset Distribution for SZE-Selected Clusters.” Monthly Notices of the Royal Astronomical Society 454.3 (2015): 2305–2319. https://orcid.org/0000-0001-5226-8349 en_US http://dx.doi.org/10.1093/mnras/stv2141 Monthly Notices of the Royal Astronomical Society Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Oxford University Press arXiv |
| spellingShingle | McDonald, Michael A. Constraints on the richness–mass relation and the optical-SZE positional offset distribution for SZE-selected clusters |
| title | Constraints on the richness–mass relation and the optical-SZE positional offset distribution for SZE-selected clusters |
| title_full | Constraints on the richness–mass relation and the optical-SZE positional offset distribution for SZE-selected clusters |
| title_fullStr | Constraints on the richness–mass relation and the optical-SZE positional offset distribution for SZE-selected clusters |
| title_full_unstemmed | Constraints on the richness–mass relation and the optical-SZE positional offset distribution for SZE-selected clusters |
| title_short | Constraints on the richness–mass relation and the optical-SZE positional offset distribution for SZE-selected clusters |
| title_sort | constraints on the richness mass relation and the optical sze positional offset distribution for sze selected clusters |
| url | http://hdl.handle.net/1721.1/108814 https://orcid.org/0000-0001-5226-8349 |
| work_keys_str_mv | AT mcdonaldmichaela constraintsontherichnessmassrelationandtheopticalszepositionaloffsetdistributionforszeselectedclusters |