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Efstathiou, Andreas
Observations of the Hubble Deep Field South with the Infrared Space Observatory - I. Observations, data reduction and mid-infrared source counts
2002-05-21, Oliver, Sebastian James, Robert Mann, Robert, Carballo, Ruth, Franceschini, Alberto, Rowan-Robinson, Michael, Kontizas, Maria, Dapergolas, Anastasios, Kontizas, Evanghelos, Verma, Aprajita, Elbaz, David, Granato, Gianluigi, Silva, Laura Da, Rigopoulou, Dimitra, González-Serrano, José Ignacio, Serjeant, Stephen B.G., Efstathiou, Andreas, Van Der Werf, Paul P., Oliver, Sebastian James
We present results from a deep mid-infrared survey of the Hubble Deep Field South (HDF-S) region performed at 6.7 and 15 μm with the ISOCAM instrument on board the Infrared Space Observatory (ISO). The final map in each band was constructed by the co-addition of four independent rasters, registered using bright sources securely detected in all rasters, with the absolute astrometry being defined by a radio source detected at both 6.7 and 15 μm. We sought detections of bright sources in a circular region of radius 2.5 arcmin at the centre of each map, in a manner that simulations indicated would produce highly reliable and complete source catalogues using simple selection criteria. Merging source lists in the two bands yielded a catalogue of 35 distinct sources, which we calibrated photometrically using photospheric models of late-type stars detected in our data. We present extragalactic source count results in both bands, and discuss the constraints that they impose on models of galaxy evolution, given the volume of space sampled by this galaxy population.
The European Large Area ISO Survey - I. Goals, definition and observations
2000-08-21, Oliver, Sebastian James, Rowan-Robinson, Michael, Alexander, David M., Almaini, Omar, Balcells, Marc, Baker, Amanda C., Barcons, X., Barden, Marco, Bellas-Velidis, Ioannis, Cabrera-Guerra, F., Carballo, Ruth, Césarsky, Catherine J., Ciliegi, Paolo, Clements, David L., Crockett, Hans, Danese, Luigi, Dapergolas, Anastasios, Drolias, B., Eaton, Nick, Efstathiou, Andreas, Egami, Eiichi E., Elbaz, David, Fadda, Dario T., Fox, Matt J., Franceschini, Alberto, Genzel, Reinhardt, Goldschmidt, Pippa, Graham, Matthew J., González-Serrano, José Ignacio, González-Solares, Eduardo A., Granato, Gianluigi, Gruppioni, Carlotta, Herbstmeier, Uwe, Héraudeau, Ph, Joshi, M. K., Oliver, Sebastian James
Observations of the Hubble Deep Field with the Infrared Space Observatory - III. Source counts and P(D) analysis
1997-01-01, 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 E., Kontizas, Maria, Andy R. Lawrence, Andy, McMahon, R. G., Nørgaard-Nielsen, Hans Ulrik, Pérez-Fournón, Ismaël, González-Serrano, José Ignacio, Oliver, Sebastian James
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.