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Observations of the Hubble Deep Field with the Infrared Space Observatory. III. Source counts and P(D) analysis | | The ISO-HDF Consortium: Seb Oliver et al
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2 Jul 1997 | | Journal: | Mon.Not.Roy.Astron.Soc. 289 (1997) 471-481 | | Subject: | astro-ph | | Affiliation: | Imperial College | | Abstract: | We present source counts at 6.7 micron and 15 micron from our maps of the Hubble Deep Field region, reaching 38.6 microJy at 6.7 micron and 255 microJy at 15 micron. These are the first ever extra-galactic number counts to be presented at 6.7 micron and are 3 decades fainter than IRAS at 12 micron. Both source counts and a P(D) analysis suggest we have reached the ISO confusion limit at 15 micron: 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 micron is ruled out at >3 sigma, while two models which fit the steep IRAS 60 micron 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 micron data. | | Source: | arXiv, astro-ph/9707029 | | Services: | Forum | Review | PDF | Favorites | |
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