Search Publications
Transient correction of the LW-ISOCAM data for low contrasted illumination
Abergel, A.; Coulais, A.
The detector of the Long Wavelength channel of the ISOCAM camera on-board the Infrared Space Observatory (ISO) presents systematic memory effects of the response which can bias the photometry by a factor as high as 40%. We show that, for uniform illumination, the non linear model developed by \cite[Fouks and Schubert (1995)]{fou95} for the detecto…
Optimizing ISOCAM data processing using spatial redundancy
Miville-Deschênes, M. -A.; Boulanger, F.; Abergel, A. +1 more
Several instrumental effects of the Long Wavelength channel of ISOCAM, the camera on board the Infrared Space Observatory, degrade the processed images. We present new data-processing techniques that correct these defects, taking advantage of the fact that a position in the sky has been observed by several pixels at different times. We use this re…
ISOCAM observations of the very deep IRAS 60 micron sample in the NEP region. I. The data
Aussel, H.; Franceschini, A.; De Zotti, G. +2 more
We present the results of ISO observations with the CAM LW3 filter, centered at lambda_eff = 14.3 mu m, of 94 out of the 98 galaxies comprising the complete 60 mu m IRAS deep survey (IDS) sample in the north ecliptic polar region. In addition, we observed a source detected by IRAS at 25 mu m and found to have particularly interesting properties. A…
A combined approach for object detection and deconvolution
Valtchanov, I.; Starck, J. -L.; Bijaoui, A. +1 more
The Multiscale Vision Model is a recent object detection method, based on the wavelet transform. It allows us to extract all objects contained in an image, whatever their size or their shape. From each extracted object, information concerning flux or shape can easily be determined. We show that such an approach can be combined with deconvolution, …
ISOCAM data processing
Aussel, H.; Abergel, A.; Pantin, E. +6 more
The ISOCAM infrared camera is one of the four instruments on board the ISO (Infrared Space Observatory) spacecraft which was launched successfully on 1995 November 17. It operates in the 2.5 - 18 mu m range, and was developed by the ISOCAM consortium lead by the French Service d'Astrophysique of CEA Saclay. This paper presents different algorithms…
Faint source detection in ISOCAM images
Aussel, H.; Elbaz, D.; Cesarsky, C. +2 more
We present a tool adapted to the detection of faint mid-infrared sources within ISOCAM mosaics. This tool is based on a wavelet analysis which allows us to discriminate sources from cosmic ray impacts at the very limit of the instrument, four orders of magnitudes below IRAS. It is called PRETI for Pattern REcognition Technique for ISOCAM data, bec…
Young massive stars in the ISOGAL survey. I. VLA observations of the ISOGAL l=+45 field
Felli, M.; Testi, L.; Taylor, G. B.
We present VLA radio continuum observations at 3.6 and 6 cm of a ~ 0.65 sq. deg. field in the galactic plane at l=+45(deg) . These observations are meant to be used in a comparison with ISO observations at 7 and 15 mu m of the same region. In this paper we compare the radio results with other radio surveys and with the IRAS-PSC. At 3.6 and/or 6 cm…
Observations of GRBs with the Infrared Space Observatory
Altieri, B.; Piro, L.; Palazzi, E. +17 more
We present results from the Target of Opportunity (TOO) program to observe GRB locations with the CAM and PHOT instruments aboard the Infrared Space Observatory (ISO). Four BeppoSAX/ GRB error circles were observed by ISO on timescales ranging from days to months after the GRB events. These observations represent the first prompt GRB counterpart s…
Infrared standards for ISO. I. A new calibration of mid infrared photometry
Kessler, M. F.; Bouchet, P.; Metcalfe, L. +5 more
We present N, 8.7 mu m, 9.8 mu m 12.5 mu m and Q bolometry of 26 stars which were observed on the IRTF. These are primarily K giants which have been well measured at other wavelengths and are chosen to be single and non-variable. Hence the data presented provides a new homogeneous set of mid IR standards. As a test of part of the calibration strat…