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<ri:Resource created="2026-06-05T12:10:24Z" status="active" updated="2026-06-15T00:00:00Z" version="1.2" xmlns:cs="http://www.ivoa.net/xml/ConeSearch/v1.0" xmlns:ri="http://www.ivoa.net/xml/RegistryInterface/v1.0" xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0" xmlns:vs="http://www.ivoa.net/xml/VODataService/v1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.ivoa.net/xml/ConeSearch/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/ConeSearch.xsd http://www.ivoa.net/xml/VOResource/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource.xsd http://www.ivoa.net/xml/VODataService/v1.1 http://vo.ari.uni-heidelberg.de/docs/schemata/VODataService.xsd" xsi:type="vs:CatalogService"><title>ASKAP-FLASH catalog</title><shortName>J/other/PASA/43.</shortName><identifier>ivo://CDS.VizieR/J/other/PASA/43.65</identifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Roster W.</name></creator><creator><name>Sadler M.</name></creator><creator><name>Mahony E.K.</name></creator><creator><name>Salvato M.</name></creator><creator><name>Yoon H.</name></creator><creator><name>Kluge M.,Shirley R.</name></creator><creator><name>Kerrison E.</name></creator><creator><name>Buchner J.</name></creator><creator><name>Igo Z.</name></creator><creator><name>Davies R.</name></creator><creator><name>Allison J.R.,Shabala S.S.</name></creator><creator><name>Moss V.A.</name></creator><creator><name>Starck H.</name></creator><creator><name>Whiting M.</name></creator><creator><name>Nandra K.</name></creator><creator><name>Weller J.</name></creator><date role="Updated">2026-06-05T11:11:38Z</date><date role="Created">2026-06-05T12:10:24Z</date><contact><name>CDS support team</name><address>CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France</address><email>cds-question@unistra.fr</email></contact></curation><content><subject>surveys</subject><subject>radio-sources</subject><subject>redshifted</subject><subject>infrared-photometry</subject><subject>visible-astronomy</subject><description>We present the characterisation, including a photometric redshift (photo-z) analysis, of the optical counterparts (CTPs) to over 45000 bright (S_856MHz_&gt;=30mJy) compact radio sources, identified across all ASKAP First Large Absorption Survey in HI (FLASH) fields observed up to April 2025. These sources constitute a large, homogeneous population of background continuum sightlines specifically selected to enable statistical studies of cold gas at intermediate redshifts of 0.42&lt;=z&lt;=1. As spectroscopic redshift measurements are not available for the majority of these candidate absorbers, we estimate photo-zs for the CTPs of all FLASH continuum sources cross-matched to the tenth data release of the DESI Legacy Imaging Surveys (LS10). Using these estimates, we establish the redshift distribution and find that approximately 13% of continuum sources lie at z&lt;0.42 (foreground), 35% within the detectability range of FLASH ('in-band'), and 52% at z&gt;1 (background). We examine the subset of FLASH continuum sources with CTPs in the eROSITA X-ray survey, providing additional insight into their AGN content, multiwavelength properties, and environments. Finally, we discuss how this information can be used as a statistical prior to aid in distinguishing between associated and intervening HI absorption systems and estimating the total comoving absorption path length of the survey, establishing a framework for incorporating redshift-based priors in future large radio absorption surveys. We release a catalogue of LS10 counterparts to FLASH continuum sources, providing photo-z estimates, associated uncertainties, and measures of redshift degeneracies.</description><source format="bibcode">2026PASA...43...65R</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/PASA/43.65</referenceURL><type>Catalog</type><contentLevel>Research</contentLevel><relationship><relationshipType>IsServedBy</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/TAP">TAP VizieR generic service</relatedResource></relationship><relationship><relationshipType>IsServedBy</relationshipType><relatedResource>Conesearch service</relatedResource></relationship><relationship><relationshipType>related-to</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/J/MNRAS/473/4937">J/MNRAS/473/4937 : AllWISE ctp to ROSAT/2RXS &amp; XMMSLEW2 catalogs</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/692/A260">J/A+A/692/A260 : PICZL. Image-based photo-z for AGN (Roster+, 2024)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/704/A344">J/A+A/704/A344 : eRASS1 counterparts and classification (Salvato+, 2025)</relatedResource><relatedResource>https://www.legacysurvey.org/dr10 : DESI LS10 Home Page</relatedResource></relationship></content><rights>https://cds.unistra.fr/vizier-org/licences_vizier.html</rights><capability><interface xsi:type="vr:WebBrowser"><accessURL use="full">https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/PASA/43.65</accessURL><mirrorURL title="VizieR at IUCAA: Pune, India">https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/PASA/43.65</mirrorURL><mirrorURL title="VizieR at SAAO: SAAO, South Africa">http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/PASA/43.65</mirrorURL></interface></capability><capability><interface xsi:type="vs:ParamHTTP"><accessURL 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Should Not be used for identification.</description><ucd>meta.record</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>FLASHcompid</name><description>Concatenation of FLASH SBID and unique component identifier (FLASH_component_id)</description><ucd>meta.id;meta.main</ucd><dataType xsi:type="vs:VOTableType" arraysize="22*">char</dataType></column><column><name>FLASHSBID</name><description>FLASH tile (FLASH_SBID)</description><ucd>meta.id.parent</ucd><dataType xsi:type="vs:VOTableType" arraysize="7*">char</dataType></column><column><name>RAJ2000</name><description>Right Ascension (J2000) of the radio source in the parent catalog (FLASH_RA)</description><unit>deg</unit><ucd>pos.eq.ra;meta.main</ucd><flag>indexed</flag></column><column><name>DEJ2000</name><description>Declination (J2000) of the radio source in the parent catalog (FLASH_DEC)</description><unit>deg</unit><ucd>pos.eq.dec;meta.main</ucd><flag>indexed</flag></column><column><name>FpeakFLASH</name><description>Peak flux (712- 1000MHz) of the radio source (FLASH_flux_peak)</description><unit>mJy</unit><ucd>phot.flux.density;em.radio.750-1500MHz</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>LS10type</name><description>LS10 morphological classification (LS10_type)</description><ucd>src.morph</ucd><dataType xsi:type="vs:VOTableType" arraysize="3*">char</dataType></column><column><name>pi</name><description>Relative probability of the FLASH/LS10 match (NWAY_p_i) (1)</description><ucd>stat.fit.omc</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>MatchFlag</name><description>Match flag (NWAY_match_flag) (2)</description><ucd>meta.code.qual</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>purityatpany</name><description>Sample purity if cut at p_any (NWAY_purity_at_p_any)</description><ucd>meta.code</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>complatpany</name><description>Sample completeness if cut at p_any (NWAY_completeness_at_p_any)</description><ucd>meta.code</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>PICZLzph</name><description>PICZL photometric redshift (PICZL_z_phot) (3)</description><ucd>src.redshift.phot</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>e_FpeakFLASH</name><description>Peak flux (712-1000MHz) error of the radio source (FLASH_flux_peak_err)</description><unit>mJy</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>FintFLASH</name><description>Integrated flux (712-1000MHz) of the radio source (FLASH_flux_int)</description><unit>mJy</unit><ucd>phot.flux.density;em.radio.750-1500MHz</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>FLASHdup</name><description>Binary flag indicating whether the same radio source is detected across different SBIDs (FLASH_duplicate)</description><ucd>meta.code</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>FLASHdupApp</name><description>? Count of how often the same radio source is detected across different SBIDs (FLASH_duplicate_appearances)</description><ucd>meta.code</ucd><dataType xsi:type="vs:VOTableType">int</dataType><flag>nullable</flag></column><column><name>FLASHdupMSep</name><description>? Maximum positional separation of the same radio source detected across different SBIDs (FLASH_duplicate_max_separation)</description><ucd>pos.angDistance</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>RALdeg</name><description>Legacy survey DR10 J2000 right Ascension of the CTP (LS10_RA)</description><unit>deg</unit><ucd>pos.eq.ra</ucd></column><column><name>DELdeg</name><description>Legacy survey DR10 J2000 declination of the CTP (LS10_DEC)</description><unit>deg</unit><ucd>pos.eq.dec</ucd></column><column><name>InAllLS10</name><description>Binary flag indicating whether the CTP is detected in *all* optical LS10 bands (InAllLS102025)</description><ucd>meta.code</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>InAnyLS10</name><description>Binary flag indicating whether the CTP is detected in *any* optical LS10 bands (InAnyLS102025)</description><ucd>meta.code</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>FW1LS10</name><description>Dereddened LS10 flux in WISE W1 band in nanomaggy (LS10_dered_flux_w1)</description><unit>3.63uJy</unit><ucd>phot.mag;em.IR.3-4um</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>FW2LS10</name><description>Dereddened LS10 flux in WISE W2 band in nanomaggy (LS10_dered_flux_w2)</description><unit>3.63uJy</unit><ucd>phot.mag;em.IR.4-8um</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>FW3LS10</name><description>Dereddened LS10 flux in WISE W3 band in nanomaggy (LS10_dered_flux_w3)</description><unit>3.63uJy</unit><ucd>phot.flux.density;em.IR.8-15um</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>FW4LS10</name><description>Dereddened LS10 flux in WISE W4 band in nanomaggy (LS10_dered_flux_w4)</description><unit>3.63uJy</unit><ucd>phot.flux.density;em.IR.15-30um</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>FgLS10</name><description>Dereddened LS10 flux in WISE g band in nanomaggy (LS10_dered_flux_g)</description><unit>3.63uJy</unit><ucd>phot.mag;em.opt.B</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>FrLS10</name><description>Dereddened LS10 flux in WISE r band in nanomaggy (LS10_dered_flux_r)</description><unit>3.63uJy</unit><ucd>phot.mag;em.opt.R</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>FiLS10</name><description>Dereddened LS10 flux in WISE i band in nanomaggy (LS10_dered_flux_i)</description><unit>3.63uJy</unit><ucd>phot.mag;em.opt.I</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>FzLS10</name><description>Dereddened LS10 flux in WISE z band in nanomaggy (LS10_dered_flux_z)</description><unit>3.63uJy</unit><ucd>phot.mag;em.opt.I</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>LS10Qual</name><description>SNR quality class for optical LS10 bands (LS10_snr_quality)</description><ucd>meta.code.qual</ucd><dataType xsi:type="vs:VOTableType" arraysize="23*">char</dataType></column><column><name>LS10radio</name><description>CTP probability to of being a radio emitter based on the Random Forest model (NWAY_LS10_radio)</description><ucd>stat.fit.goodness</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>sepFLASH-LS10</name><description>Distance between FLASH and LS10 source (NWAY_separation_FLASH_LS10)</description><unit>arcsec</unit><ucd>pos.angDistance</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>Distbf</name><description>Logarithm of ratio between prior and posterior, from separation, positional error and number density (NWAY_dist_bayesfactor) (1)</description><ucd>stat.fit.omc</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>Distpost</name><description>Distance posterior probability comparing this association vs. no association (NWAY_dist_post) (1)</description><ucd>stat.fit.omc</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>Bias</name><description>Probability weighting introduced by the LS10-based prior. 1 indicates no change (NWAY_bias_LS10_radio_proba)</description><ucd>stat.fit.goodness</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>psingle</name><description>Same as dist_post, but weighted by the prior (NWAY_p_single) (1)</description><ucd>stat.fit.omc</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>pany</name><description>For each entry in the radio catalogue, the probability that there is a counterpart in LS10 (NWAY_p_any) (1)</description><ucd>stat.fit.omc</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>PICZLpdfdegen</name><description>PICZL PDF degeneracy class (PICZL_pdf_degeneracy)</description><ucd>meta.code.class</ucd><dataType xsi:type="vs:VOTableType" arraysize="6*">char</dataType></column><column><name>PICZLsPeakPSF</name><description>? PICZL PDF secondary peak for LS10_type (PICZL_secondary_peak_PSF)</description><ucd>stat.fit.param</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>PICZLsPeakHz</name><description>? PICZL PDF secondary peak for CTPs at low redshift (PICZL_secondary_peak_high_z)</description><ucd>meta.note</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>PICZLbestzph</name><description>Recommended PICZL photo-z solution (PICZL_best_z_phot)</description><ucd>src.redshift.phot</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>e_PICZLbestzph</name><description>Photo-z lower 1 sigma error (PICZL_lower_1sig)</description><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>E_PICZLbestzph</name><description>Photo-z upper 1 sigma error (PICZL_upper_1sig)</description><ucd>stat.error;stat.max</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>PICZLmperr</name><description>Binary flag indicating whether the 1 sigma error range includes more than 1 significant PDF peak (PICZL_multi_peak_errors)</description><ucd>meta.code</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>LS10</name><description>Legacy survey DR10 unique identifier of the CTP by concatenation of RELEASE, BRICKID and OBJID (LS10_FULLID)</description><ucd>meta.id</ucd><dataType xsi:type="vs:VOTableType" arraysize="18*">char</dataType></column></table></schema></tableset></ri:Resource>