@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#> .

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    dct:description "This table contains a list of discrete sources found in a 60-ks Chandra ACIS-S observation of the isolated edge-on spiral galaxy NGC 3556 (M108). In the reference paper in which the authors present this table, they also give a multiwavelength analysis of the various discrete X-ray sources and of the diffuse X-ray features. Among 33 discrete X-ray sources detected within the I&lt;sub&gt;B&lt;/sub&gt; = 25 mag arcsec&lt;sup&gt;-2&lt;/sup&gt; isophotal ellipse of the galaxy, the authors identify a candidate for the galactic nucleus, an ultraluminous X-ray source that might be an accreting intermediate-mass black hole, a possible X-ray binary with a radio counterpart, and two radio-bright giant H II regions. They also detect large amounts of extraplanar diffuse X-ray emission, which extend about 10 kpc radially in the disk and &gt;~4 kpc away from the galactic plane. The diffuse X-ray emission exhibits significant substructures, possibly representing various blown-out superbubbles or chimneys of hot gas heated in massive star-forming regions. This Chandra observation of NGC 3556 (observation ID 2025) was taken between 2001 September 8 and 9 for an exposure of 60 ks. The ACIS-S instrument was at the focal plane of the telescope. This table was created by the HEASARC in August 2015 based on the &lt;a href=\"https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJ/598/969\"&gt;CDS Catalog J/ApJ/598/969&lt;/a&gt; file table2.dat. This is a service provided by NASA HEASARC ." ;
    dct:identifier "ivo://nasa.heasarc/m108cxo" ;
    dct:issued "2025-09-24T23:50:35.571201"^^xsd:dateTime ;
    dct:modified "2025-09-10"^^xsd:date ;
    dct:publisher <https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> ;
    dct:title "M 108 Chandra X-Ray Compact Source Catalog" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "Tess Jaffe" ;
            vcard:hasEmail <mailto:tess.jaffe@nasa.gov> ] ;
    dcat:distribution <https://data.amerigeoss.org/dataset/336b3757-da88-4445-a901-7491d3c16eed/resource/1d939d77-7747-4ead-9907-bf729a32aa25>,
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    dcat:keyword "AmeriGEO",
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        "CKAN",
        "GEO",
        "GEOSS",
        "National",
        "North America",
        "United States",
        "na" ;
    dcat:theme <%7BAstrophysics%7D> .

<https://data.amerigeoss.org/dataset/336b3757-da88-4445-a901-7491d3c16eed/resource/1d939d77-7747-4ead-9907-bf729a32aa25> a dcat:Distribution ;
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    dct:issued "2025-08-30T04:29:53.008995"^^xsd:dateTime ;
    dct:modified "2025-09-24T23:50:35.555764"^^xsd:dateTime ;
    dct:title "Data Information (HTML)" ;
    dcat:accessURL <https://heasarc.gsfc.nasa.gov/W3Browse/all/m108cxo.html> ;
    dcat:mediaType "text/html" .

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    dct:title "Data Information (Unknown Format)" ;
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    dcat:mediaType "application/octet-stream" .

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