Deblending the MIGHTEE-COSMOS survey with XID plus : the resolved radio source counts to S1.4 ≈ 5μJy
文献类型：期刊论文
| 作者 | Malefahlo, Eliab13,14; Jarvis, Matt J12,13; Santos, Mario G11,13; Cress, Catherine14; Smith, Daniel J B1; Hale, Catherine9,12; Afonso, José7,8; Whittam, Imogen H12,13; Vaccari, Mattia4,5,6; Heywood, Ian2,3,12 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2026-04 |
| 卷号 | 547期号:2 |
| 关键词 | methods: data analysis methods: statistical surveys galaxies: statistics radio continuum: galaxies |
| ISSN号 | 0035-8711 |
| DOI | 10.1093/mnras/stag285 |
| 产权排序 | 第16完成单位 |
| 文献子类 | Article |
| 英文摘要 | Deep radio continuum surveys provide fundamental constraints on galaxy evolution, but source confusion limits sensitivity to the faintest sources. We present a complete framework for producing high-fidelity deblended radio catalogues from the confused MIGHTEE maps using the probabilistic deblending framework XID+ and prior positions from deep multi-wavelength data in the COSMOS field. To assess performance, we construct MIGHTEE-like simulations based on the Tiered Radio Extragalactic Continuum Simulation radio source population, ensuring a realistic distribution of star-forming galaxies and active galactic nuclei for validation. Through these simulations, we show that prior catalogue purity is the dominant factor controlling deblending accuracy: a high-purity prior, containing only sources with a high likelihood of radio detection, recovers accurate flux densities and reproduces input source counts down to similar to 3 sigma (where sigma = thermal noise). On the other hand, a complete prior overestimates the source counts due to spurious detections. Our optimal strategy combines the high-purity prior with a mask that removes sources detected above 50 mu Jy. Applied to the similar to 1.3 deg(2) area of the MIGHTEE-COSMOS field defined by overlapping multi-wavelength data, this procedure yields a deblended catalogue of 89 562 sources. The derived 1.4 GHz source counts agree with independent P(D) analyses and indicate that we resolve the radio background to similar to 4.8 mu Jy. We also define a recommended high-fidelity sample of 20 757 sources, based on detection significance, flux density, and goodness-of-fit, which provides reliable flux densities for individual sources in the confusion-limited regime. |
| 学科主题 | 天文学 ; 射电天文学 |
| URL标识 | 查看原文 |
| 出版地 | GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND |
| WOS关键词 | STAR-FORMING GALAXIES ; ACTIVE GALACTIC NUCLEUS ; FORMATION RATE DENSITY ; GHZ LARGE PROJECT ; LUMINOSITY FUNCTION ; STELLAR POPULATION ; UNSUPERVISED STAR ; FORMATION HISTORY ; HERSCHEL-ATLAS ; NUMBER COUNTS |
| 资助项目 | South African National Research Foundation[84156]; Leverhulme Trust[RPG-2025-078]; University of South Africa[409000]; NRF[150551]; FCT[UIDB/04434/2020]; FCT[UIDP/04434/2020]; FCT[UID/04434/2025]; STFC[ST/S000488/1]; STFC[ST/W000903/1]; STFC[ST/Y001028/1]; STFC[ST/Y000951/1]; UKRI[EP/X026639/1]; University of Cape Town; Natural Science Foundation of Jiangsu Province[BK20242115] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001707835000001 |
| 出版者 | OXFORD UNIV PRESS |
| 资助机构 | South African National Research Foundation[84156] ; Leverhulme Trust[RPG-2025-078] ; University of South Africa[409000] ; NRF[150551] ; FCT[UIDB/04434/2020, UIDP/04434/2020, UID/04434/2025] ; STFC[ST/S000488/1, ST/W000903/1, ST/Y001028/1, ST/Y000951/1] ; UKRI[EP/X026639/1] ; University of Cape Town ; Natural Science Foundation of Jiangsu Province[BK20242115] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/29023]  |
| 专题 | 星系类星体研究组 |
| 通讯作者 | Malefahlo, Eliab |
| 作者单位 | 1.Centre for Astrophysics Research, University of Hertfordshire, Hatfield, Herts AL10 9AB, UK; 2.Centre for Radio Astronomy Techniques and Technologies, Department of Physics and Electronics, Rhodes University, PO Box 94, Makhanda 6140, South Africa; 3.SKA Organization, Jodrell Bank, Lower Whitington, Macclesfield SK11 9FT, UK; 4.INAF – Istituto di Radioastronomia, via Gobetti 101, I-40129 Bologna, Italy; 5.Department of Astronomy, University of Cape Town, Rondebosch, Cape Town 7701, South Africa; 6.Inter-University Institute for Data Intensive Astronomy, Department of Astronomy, University of Cape Town, Rondebosch, Cape Town 7701, South Africa; 7.Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, Edifício C8, Campo Grande, PT-1749-016 Lisbon, Portugal; 8.Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa, OAL, Tapada da Ajuda, PT-1349-018 Lisbon, Portugal; 9.Institute for Astronomy, University of Edinburgh, Royal Observatory Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK; 10.Cosmic Dawn Center at the Niels Bohr Institute, University of Copenhagen and DTU-Space, Technical University of Denmark, Denmark; |
| 推荐引用方式 GB/T 7714 | Malefahlo, Eliab,Jarvis, Matt J,Santos, Mario G,et al. Deblending the MIGHTEE-COSMOS survey with XID plus : the resolved radio source counts to S1.4 ≈ 5μJy[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2026,547(2). |
| APA | Malefahlo, Eliab.,Jarvis, Matt J.,Santos, Mario G.,Cress, Catherine.,Smith, Daniel J B.,...&安芳霞.(2026).Deblending the MIGHTEE-COSMOS survey with XID plus : the resolved radio source counts to S1.4 ≈ 5μJy.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,547(2). |
| MLA | Malefahlo, Eliab,et al."Deblending the MIGHTEE-COSMOS survey with XID plus : the resolved radio source counts to S1.4 ≈ 5μJy".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 547.2(2026). |
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