2026-10-06T19:25:11Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33123632 2026-09-21T14:57:19Z category_36845 portal_289 item_type_3 month_year_09_2026

Data for XID+PRIMA, II: Stepping Through Hyperspectral Imaging to Deblend PRIMAger Beyond the Extragalactic Confusion Limit James Donnellan (13238568) Borja Pautasso (20326116) Seb Oliver (4460809) Matthieu Bethermin (8398992) Longji Bing (17360671) Alberto Bolatto (8399136) Laure Ciesla (16288139) Willem Jellema (16948890) Dennis Koopmans (24489121) Alexandra Pope (12626023) Stephen Serjeant (16865694) JD Smith (6968396) Lingyu Wang (1641121) Cosmology and extragalactic astronomy infrared : galaxies Data for '<a href="https://doi.org/10.33232/001c.170872" target="_blank" rel="noreferrer">XID+PRIMA, II: Stepping Through Hyperspectral Imaging to Deblend PRIMAger Beyond the Extragalactic Confusion Limit'.</a>Description of data:<ul><li>The noisy maps on which the analysis was run are stored in the Maps folder. They are in units of Jy/beam.</li><li>The beams for each coadded PRIMAger channel are stored in the Beams folder.</li><li>The prior source catalogues corresponding to each of our three main runs are stored in the Catalogues folder.</li><li>The summary XID+ outputs, split by channel and run, are stored in the Outputs folder. Fluxes are in mJy.</li></ul>Posterior objects, due to their large size and quantity, will only be shared upon request to James Donnellan (<a href="https://profiles.sussex.ac.uk/p562290-james-donnellan" target="_blank" rel="noreferrer">j.donnellan@sussex.ac.uk</a>) or Seb Oliver (<a href="https://profiles.sussex.ac.uk/p91548-seb-oliver" target="_blank" rel="noreferrer">s.oliver@sussex.ac.uk</a>)Article Abstract: The PRobe far-Infrared Mission for Astrophysics (PRIMA) mission concept aims to map large areas with spectral coverage and sensitivities inaccessible to previous FIR space telescopes, covering 25-235 μm. We synthesise images representing a deep imaging survey, with realistic instrumental and confusion noise, reflecting the latest PRIMAger specifications. We present a new Bayesian modelling approach, XID+stepwise, that exploits PRIMAger's hyperspectral imaging to derive self-consistent, informative flux priors by sequentially propagating constraints from short to long wavelengths. With Euclid-like prior source positions, this method recovers fluxes to within 20% down to 0.2-0.7 mJy across 45-84 μm, which correspond to factors of 1.3-3.5 fainter than the confusion limit. For the most confusion-dominated channels, accurate fluxes are measured down to 0.8, 2.7, 9.3, and 23.4 mJy at 92, 126, 183, and 235 μm, respectively, which are factors of 2-5 better than the confusion limit. Using a deeper Euclid-based prior catalogue and weak ancillary flux priors at 25 μm yields further improvements, reaching up to a factor 5 fainter than the confusion limit at 96 μm. Additionally, we demonstrate that positional priors from blind source detection followed by deblending via XID+ enables PRIMAger to achieve sensitivity beyond the confusion limits using PRIMAger data alone. We show that IR-luminous galaxies at z∼2 are robustly detected in a large fraction of the PRIMAger channels (>98% in 12 out of the 16 considered channels), providing dense sampling of the FIR SED even for sources several factors below the classical confusion limit. We explore the impact on our results for a range of systematic effects, including cirrus contamination, optical degradation, and calibration uncertainties. These findings indicate that confusion noise will not limit the key science from PRIMA extragalactic imaging surveys when employing XID+. 2026-09-21T14:57:19Z Dataset Dataset 10.25377/sussex.33123632.v2 https://figshare.com/articles/dataset/Data_for_XID_PRIMA_II_Stepping_Through_Hyperspectral_Imaging_to_Deblend_PRIMAger_Beyond_the_Extragalactic_Confusion_Limit/33123632 CC BY 4.0