@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://data.amerigeoss.org/dataset/03b11c6a-8894-4cc5-b486-65295afd96f1> a dcat:Dataset ;
    dct:description "The Chandra Deep Field North (CDFN) 2-Megasecond Catalog contains the point sources found in the ~2 Megasecond (Ms) exposure of the Chandra Deep Field North, currently the deepest X-ray observation of the universe in the 0.5 -8.0 keV band. Five hundred and three (503) X-ray sources were detected over an ~448 square arcminute area in up to seven X-ray bands. Twenty (20) of these X-ray sources lie in the central ~5.3 square arcminute Hubble Deep Field North (13600 (+3800,-3000) sources/deg&lt;sup&gt;2&lt;/sup&gt;). The on-axis sensitivity limits are ~2.5x10&lt;sup&gt;-17&lt;/sup&gt; ergs/cm&lt;sup&gt;2&lt;/sup&gt;/s (0.5 - 2.0 keV) and 1.4x10&lt;sup&gt;-16&lt;/sup&gt; ergs/cm&lt;sup&gt;2&lt;/sup&gt;/s (2 - 8 keV). Source positions are determined using matched-filter and centroiding techniques; the median positional uncertainty is ~0.3&quot;. The X-ray colors of the detected sources indicate a broad variety of source types, although absorbed AGN (including a small number of possible Compton-thick sources) are clearly the dominant type. The average backgrounds in the 0.5 - 2.0 keV and 2 - 8 keV bands are 0.056 and 0.135 counts Ms&lt;sup&gt;-1&lt;/sup&gt; pixel&lt;sup&gt;-1&lt;/sup&gt;, respectively. The background count distributions are very similar to Poisson distributions. This 2 Ms exposure is approximately photon limited in all seven X-ray bands for regions close to the aim point. This observation does not suffer from source confusion within ~6 arcminutes of the aim point. This table was created by the HEASARC in April 2004 based on CDS catalog table J/AJ/126/539/cdfn.dat. This is a service provided by NASA HEASARC ." ;
    dct:identifier "ivo://nasa.heasarc/chandfn2ms" ;
    dct:issued "2025-09-23T16:02:05.506847"^^xsd:dateTime ;
    dct:modified "2025-09-10"^^xsd:date ;
    dct:publisher <https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> ;
    dct:title "Chandra Deep Field North 2-Megasecond Catalog" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "Tess Jaffe" ;
            vcard:hasEmail <mailto:tess.jaffe@nasa.gov> ] ;
    dcat:distribution <https://data.amerigeoss.org/dataset/03b11c6a-8894-4cc5-b486-65295afd96f1/resource/4e8b97ef-51a1-40e9-af3c-cfa66f210d71>,
        <https://data.amerigeoss.org/dataset/03b11c6a-8894-4cc5-b486-65295afd96f1/resource/d3fe065d-00eb-4bf9-bb7d-eecf8c82a320> ;
    dcat:keyword "AmeriGEO",
        "AmeriGEOSS",
        "CKAN",
        "GEO",
        "GEOSS",
        "National",
        "North America",
        "United States",
        "na" ;
    dcat:theme <%7BAstrophysics%7D> .

<https://data.amerigeoss.org/dataset/03b11c6a-8894-4cc5-b486-65295afd96f1/resource/4e8b97ef-51a1-40e9-af3c-cfa66f210d71> a dcat:Distribution ;
    dct:description "chandfn2ms.html" ;
    dct:format "HTML" ;
    dct:issued "2025-08-30T12:10:21.939319"^^xsd:dateTime ;
    dct:modified "2025-09-23T16:02:05.492162"^^xsd:dateTime ;
    dct:title "Data Information (HTML)" ;
    dcat:accessURL <https://heasarc.gsfc.nasa.gov/W3Browse/all/chandfn2ms.html> ;
    dcat:mediaType "text/html" .

<https://data.amerigeoss.org/dataset/03b11c6a-8894-4cc5-b486-65295afd96f1/resource/d3fe065d-00eb-4bf9-bb7d-eecf8c82a320> a dcat:Distribution ;
    dct:format "BIN" ;
    dct:issued "2025-08-30T12:10:21.939322"^^xsd:dateTime ;
    dct:modified "2025-09-23T16:02:05.493277"^^xsd:dateTime ;
    dct:title "Data Information (Unknown Format)" ;
    dcat:accessURL <https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=chandfn2ms&> ;
    dcat:mediaType "application/octet-stream" .

<https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> a foaf:Agent ;
    foaf:name "US Migrating" .