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Observations of the Hubble Deep Field with the Infrared Space Observatory - V. Spectral energy distributions, starburst models and star formation history
Elbaz, D.; Danese, L.; Franceschini, A. +16 more
We have modelled the spectral energy distributions of the 13 Hubble Deep Field (HDF) galaxies reliably detected by the Infrared Space Observatory (ISO). For two galaxies the emission detected by ISO is consistent with being starlight or the infrared `cirrus' in the galaxies. For the remaining 11 galaxies there is a clear mid-infrared excess, which…
Observations of the Hubble Deep Field with the Infrared Space Observatory - III. Source counts and P(D) analysis
Elbaz, D.; Danese, L.; Franceschini, A. +19 more
We present source counts at 6.7 and 15 µm from our maps of the Hubble Deep Field (HDF) region, reaching 38.6 muJy at 6.7 µm and 255 muJy at 15 mum. These are the first ever extragalactic number counts to be presented at 6.7 mum, and are three decades fainter than IRAS at 12 mum. Both source counts and a P(D) analysis suggest that we ha…
An ISO Long Wavelength Spectrometer detection of CH in NGC 7027 and an HeH^+ upper limit
Barlow, M. J.; Cernicharo, J.; Liu, X. -W. +10 more
We have detected an emission line at 149.18+/-0.06 µm in the ISO Long Wavelength Spectrometer (LWS) grating spectrum of the planetary nebula NGC 7027. This line coincides in wavelength with both the HeH^+ J=1-0 fundamental pure rotational line at 149.14 µm and the CH ^2Pi_3/2 (F_2) J=3/2-^2Pi_1/2 (F_2) J=1/2 fundamental pure rotational…
Observations of the Hubble Deep Field with the Infrared Space Observatory - I. Data reduction, maps and sky coverage
Elbaz, D.; Danese, L.; Franceschini, A. +16 more
We present deep imaging at 6.7 and 15 mu from the CAM instrument on the Infrared Space Observatory (ISO), centred on the Hubble Deep Field (HDF). These are the deepest integrations published to date at these wavelengths in any region of sky. We discuss the observational strategy and the data reduction. The observed source density appears to approa…
Observations of the Hubble Deep Field with the Infrared Space Observatory - IV. Association of sources with Hubble Deep Field galaxies
Elbaz, D.; Danese, L.; Franceschini, A. +17 more
We discuss the identification of sources detected by the Infrared Space Observatory (ISO) at 6.7 and 15 µ in the Hubble Deep Field (HDF) region. We conservatively associate ISO sources with objects in existing optical and near-infrared HDF catalogues using the likelihood ratio method, confirming these results (and, in one case, clarifying th…
Observations of the Hubble Deep Field with the Infrared Space Observatory - II. Source detection and photometry
Elbaz, D.; Danese, L.; Franceschini, A. +18 more
We present positions and fluxes of point sources found in the Infrared Space Observatory (ISO) images of the Hubble Deep Field (HDF) at 6.7 and 15 mu. We have constructed algorithmically selected `complete' flux-limited samples of 19 sources in the 15-mu image, and seven sources in the 6.7-mu image. The typical flux limit at 15 mu is ~0.2 mJy and …
Detection by ISO of the far-infrared OH maser pumping lines in IRC+10420
Barlow, M. J.; Liu, X. -W.; Cox, P. +8 more
The population inversions which lead to circumstellar hydroxyl (OH) maser emission from cool stars have long been thought to be radiatively pumped. However, the proposed pumping mechanism has not been directly observed before now, because the spectral lines that correspond to the rotational transitions of the pumping cycle lie in the far-infrared,…
The neon abundance in WC stars - I. ISO SWS spectroscopy of WR146 (WC6+O)
Crowther, P. A.; Willis, A. J.; Morris, P. W. +4 more
We present infrared spectroscopy in the wavelength range 2.6-20mum of the WC6+O binary system WR146 (MR112) obtained with the Short Wavelength Spectrometer (SWS) on the Infrared Space Observatory (ISO). These data are combined with ground-based optical (INT) and near-IR (UKIRT) spectroscopy and theoretical continuum distributions revealing E(B-V) …