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    Observations of the Hubble Deep Field with the Infrared Space Observatory - III. Source counts and P(D) analysis

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    Date
    1997-01-01
    Author
    Oliver, Sebastian James
    Goldschmidt, Pippa
    Franceschini, Alberto
    Serjeant, Stephen B.G.
    Efstathiou, Andreas
    Verma, Aprajita
    Gruppioni, Carlotta
    Eaton, Nick
    Robert Mann, Robert
    Mobasher, Bahram
    Pearson, Chris P.
    Rowan-Robinson, Michael
    Sumner, Timothy J.
    Danese, Luigi
    Elbaz, David
    Egami, Eiichi
    Kontizas, Maria
    Andy R. Lawrence, Andy
    McMahon, R. G.
    Nørgaard-Nielsen, Hans Ulrik
    Pérez-Fournón, Ismaël
    González-Serrano, José Ignacio
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    Abstract
    We present source counts at 6.7 and 15 μm from our maps of the Hubble Deep Field (HDF) region, reaching 38.6 μJy at 6.7 μm and 255 μJy at 15 μm. These are the first ever extragalactic number counts to be presented at 6.7 μm, and are three decades fainter than IRAS at 12 μm. Both source counts and a P(D) analysis suggest that we have reached the Infrared Space Obsen'atory (ISO) confusion limit at 15 μm: this will have important implications for future space missions. These data provide an excellent reference point for other ongoing ISO surveys. A no-evolution model at 15 μm is ruled out at > 3σ, while two models which fit the steep IRAS 60-μm counts are acceptable. This provides important confirmation of the strong evolution seen in IRAS surveys. One of these models can then be ruled out from the 6.7-μm data.
    URI
    https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0001544575&origin=inward
    https://repo.euc.ac.cy/handle/123456789/630
    DOI
    10.1093/mnras/289.2.471
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