Transient correction of the LW-ISOCAM data for
low contrasted illumination

Coulais, A.; Abergel, A.

doi:10.1051/aas:2000130

Cited by 58 publications

(50 citation statements)

References 9 publications

(19 reference statements)

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“…This was followed by applying the multiresolution algorithm "correct-glitch-mr". Next, the "correct-transient-fs" routine, based on the FouksSchubert transient correction method (Coulais & Abergel 2000), was applied to the data to remove transient effects. The frames were flat-fielded using the CIR's library flat field, and subsequently combined to produce a final image.…”

Section: Mid-infrared 12 μM Iso/cam Datamentioning

confidence: 99%

A mid-IR study of Hickson compact groups

Bitsakis¹,

Charmandaris

Floc’h

et al. 2010

A&A

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Hickson compact groups (HCGs) are among the densest galaxy environments of the local universe. To examine the effects of the environment on the infrared properties of these systems, we present an analysis of Spitzer and ISO mid-infrared imaging, as well as of deep ground-based near-infrared imaging of 14 HCGs containing a total of 69 galaxies. Based on mid-infrared color diagnostics we identify the galaxies that appear to host an active nucleus, while using a suite of templates, and fit the complete infrared spectral energy distribution for each group member. We compare our estimates of galaxy mass, star formation rate, total infrared luminosities, and specific star formation rates (sSFR) for our HCG sample to samples of isolated galaxies and interacting pairs and find that overall there is no discernible difference among them. However, HCGs that can be considered as dynamically "old" host late-type galaxies with a slightly lower sSFR than the one found in dynamically "young" groups. This could be attributed to multiple past interactions among the galaxies in old groups, that have led to the build up of their stellar mass. It is also consistent with our prediction of the presence of diffuse cold dust in the intergalactic medium of 9 of the dynamically "old" groups.

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Section: Mid-infrared 12 μM Iso/cam Datamentioning

confidence: 99%

A mid-IR study of Hickson compact groups

Bitsakis¹,

Charmandaris

Floc’h

et al. 2010

A&A

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“…Unlike the ISOCAM and ISOPHOT-S Si:Ge detectors on board ISO, which operate in the mid-IR, the transient response behaviour of the Ge:Ga detectors of ISOPHOT-C are not described by the analytical Fouks Schubert model Schubert et al 1995;Acosta-Pulido 1998; see Coulais & Abergel 2000 for its application to ISOCAM). Although numerical simulations of the transient behaviour of Ge:Ga detectors have been made (Hagel et al 1996), these A schematic representation of the response of the semiempirical detector model used in the P32 algorithm to an upwards step in illumination from S ∞p to S ∞ .…”

Section: Semi-empirical Detector Modelmentioning

confidence: 99%

Photometric mapping with ISOPHOT using the “P32” Astronomical Observation Template

Tuffs

Gabriel²

2003

A&A

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Abstract. The "P32" Astronomical Observation Template (AOT) provided a means to map large areas of sky (up to 45 × 45 arcmin) in the far-infrared (FIR) at high redundancy and with sampling close to the Nyquist limit using the ISOPHOT C100 (3 × 3) and C200 (2 × 2) detector arrays on board the Infrared Space Observatory (ISO). However, the transient response behaviour of the Ga:Ge detectors, if uncorrected, can lead to severe systematic photometric errors and distortions of source morphology on maps. We describe the basic concepts of an algorithm which can successfully correct for transient response artifacts in P32 observations. Examples are given to demonstrate the photometric and imaging performance of ISOPHOT P32 observations of point and extended sources corrected using the algorithm. For extended sources we give the integrated flux densities of the nearby galaxies NGC 6946, M 51 and M 101. and an image of M 101 at 100 µm.

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“…The LW array presents a time lagged response after a flux step depending on the flux history, the pixel number and the spatial structure of the illumination (Abergel et al 2000a). We use the new model developped by Coulais & Abergel (2000), optimised for low contrasted illumination. This model generally fails for strong point sources, but low contrasted regions are corrected with an accuracy of ∼1%.…”

Section: Appendix A: Observational Strategy and Data Reduction Of Thementioning

confidence: 99%

Evolution of very small particles in the southern part of Orion B observed by ISOCAM

Abergel

Bernard

Boulanger

et al. 2002

A&A

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Abstract. We present ISOCAM observations (5−18 µm) of the southern part of Orion B, including the reflection nebula NGC 2023 and the Horsehead nebula illuminated by the B star HD 37903 and the O star σ Orionis, respectively. Due to the limited radiation field, the emission in these wavelengths is due to very small particles which are heated each time they absorb a UV photon. A filamentary structure is detected at small angular scales (down to the angular resolution of 6 ) on top of a smoother background. The particular case of the Horsehead nebula suggests that the filaments in general result from the illuminated surfaces of dense structures, while the smoother background comes from lower density matters probably ionised.Striking spatial variations of the infrared colour (5−8.5 µm/12-18 µm) are also detected. Spectroscopic observations show that they are due to variations of the intensity of the aromatic features (especially at 7.7 µm) relative to a continuum emission increasing in intensity towards longer wavelengths. The contribution of the continuum relative to the aromatic features appears significantly higher at the illuminated surfaces of dense structures than in lower density matter. This effect could be the signature of the evolution of the very small particles from shielded molecular material to photo-dissociated and photo-ionised matter. We also show that size segregation due to grain dynamics in uni-directional radiation fields may play a major role.

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Transient correction of the LW-ISOCAM data for low contrasted illumination

Cited by 58 publications

References 9 publications

A mid-IR study of Hickson compact groups

A mid-IR study of Hickson compact groups

Photometric mapping with ISOPHOT using the “P32” Astronomical Observation Template

Evolution of very small particles in the southern part of Orion B observed by ISOCAM

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