A deconvolution technique to correct deep images of galaxies  from instrumental scattered light

Karabal, Emin; Duc, Pierre–Alain; Küntschner, H.; Chanial, P.; Cuillandre, Jean-Charles; Gwyn, Stephen

doi:10.1051/0004-6361/201629974

Cited by 32 publications

(27 citation statements)

References 27 publications

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“…We note that PSF effects that may affect the light and colour distributions of galaxies (see the study of Karabal et al 2017, based on MegaCam images) cannot explain the specific properties of the diffuse, off-centred, light around NGC 7317. At its location on the MegaCam image, instrumental ghosts generated by the galaxy nucleus should instead be concentric as illustrated by the light profiles of the bright foreground stars surrounding the galaxy.…”

Section: The Diffuse Halomentioning

confidence: 85%

Revisiting Stephan's Quintet with deep optical images

Duc

Cuillandre

Renaud

2018

Monthly Notices of the Royal Astronomical Society: Letters

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Stephan's Quintet, a compact group of galaxies, is often used as a laboratory to study a number of phenomena, including physical processes in the interstellar medium, star formation, galaxy evolution, and the formation of fossil groups. As such, it has been subject to intensive multi-wavelength observation campaigns. Yet, models lack constrains to pin down the role of each galaxy in the assembly of the group. We revisit here this system with multi-band deep optical images obtained with MegaCam on the Canada-France-Hawaii Telescope (CFHT), focusing on the detection of low surface brightness (LSB) structures. They reveal a number of extended LSB features, some new, and some already visible in published images but not discussed before. An extended diffuse, reddish, lopsided, halo is detected towards the early-type galaxy NGC 7317, the role of which had so far been ignored in models. The presence of this halo made of old stars may indicate that the group formed earlier than previously thought. Finally, a number of additional diffuse filaments are visible, some close to the foreground galaxy NGC 7331 located in the same field. Their structure and association with mid-IR emission suggest contamination by emission from Galactic cirrus.

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Section: The Diffuse Halomentioning

confidence: 85%

Revisiting Stephan's Quintet with deep optical images

Duc

Cuillandre

Renaud

2018

Monthly Notices of the Royal Astronomical Society: Letters

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“…Their approach has been successfully applied for the Burrell Schmidt Deep Virgo Survey (Mihos et al 2017). Duc et al (2015) and later Karabal et al (2017) performed a similar correction for the MATLAS survey data, but with time-consuming manual modeling.…”

Section: Data Reductionmentioning

confidence: 99%

Structure of Brightest Cluster Galaxies and Intracluster Light

Kluge

Neureiter

Riffeser

et al. 2020

ApJS

120

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Observations of 170 local (z 0.08) galaxy clusters in the northern hemisphere have been obtained with the Wendelstein Telescope Wide Field Imager (WWFI). We correct for systematic effects such as PSF broadening, foreground stars contamination, relative bias offsets and charge persistence. Scattered light induced background inhomogeneities are reduced down to ∆SB > 31 g' mag arcsec −2 by large dithering and subtraction of night-sky flats. Residual background inhomogeneities brighter than SB σ < 27.6 g' mag arcsec −2 caused by galactic cirrus are detected in front of 23% of the clusters. However, the large field of view allows to discriminate between accretion signatures and galactic cirrus. We detect accretion signatures in form of tidal streams in 22%, shells in 9.4%, multiple nuclei in 47% and two Brightest Cluster Galaxies (BCGs) in 7% of the clusters / BCGs.We measure semi-major axis surface brightness profiles of the BCGs and their surrounding Intracluster Light (ICL) down to a limiting surface brightness of SB = 30 g' mag arcsec −2 . The spatial resolution in the inner regions is increased by combining the WWFI light profiles with those that we measured from archival Hubble Space Telescope images or deconvolved WWFI images. We find that 71% of the BCG+ICL systems have SB profiles that are well described by a single Sérsic (SS) function whereas 29% require a double Sérsic (DS) function to obtain a good fit. SS BCGs, having more symmetric isophotal shapes and fewer detected accretion signatures than DS BCGs, appear to have slightly more relaxed morphology than their DS counterparts. Members of the latter type encompass S2 = 52 ± 21% of their total light in the outer Sérsic component. There is a wide scatter in transition radii r × between the two Sérsic components and surface brightnesses at the transition radii SB(r × ). The integrated brightnesses of the BCG+ICL systems correlate only weakly with S2, r × and SB(r × ). That indicates that the outer Sérsic component is unlikely to trace the dynamically hot ICL since BCG+ICL systems grow at present epoch predominantly in their outskirts.We find that BCGs have scaling relations that differ markedly from those of normal ellipticals, likely due to their indistinguishable embedding in the ICL. The most extended BCG+ICL systems have luminosities and radii comparable to whole clusters. We use different plausible estimates for the ICL component (based on an integrated brightness threshold, SB thresholds and profile decompositions) and find that they do not affect our conclusions about the properties of the ICL. On average, the ICL seems to be better aligned than the BCG with the host cluster in terms of position angle and centering. That makes it a potential Dark Matter tracer. We find positive correlations between BCG+ICL brightness and cluster mass, cluster radius, cluster richness and integrated satellite brightness, confirming that BCG/ICL growth is indeed coupled with cluster growth.

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“…While the first type of structures is discussed in the current paper, exploiting the images of stellar halos requires corrections for the light scattered by the optical elements of the camera, and the wide wings of the PSF. A deconvolution technique is used for this (Karabal et al 2017). Results will presented in Yıldız et al in prep..…”

Section: The Matlas Surveymentioning

confidence: 99%

Census and classification of low-surface-brightness structures in nearby early-type galaxies from the MATLAS survey

Bílek

Duc

Cuillandre

et al. 2020

Monthly Notices of the Royal Astronomical Society

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The morphology of galaxies gives essential constraints on the models of galaxy evolution. The morphology of the features in the low-surface-brightness regions of galaxies has not been fully explored yet because of observational difficulties. Here we present the results of our visual inspections of very deep images of a large volume-limited sample of 177 nearby massive early-type galaxies (ETGs) from the MATLAS survey. The images reach a surface-brightness limit of 28.5 − 29 mag arcsec−2 in the g′ band. Using a dedicated navigation tool and questionnaire, we looked for structures at the outskirts of the galaxies such as tidal shells, streams, tails, disturbed outer isophotes or peripheral star-forming disks, and simultaneously noted the presence of contaminating sources, such as Galactic cirrus. We also inspected internal sub-structures such as bars and dust lanes. We discuss the reliability of this visual classification investigating the variety of answers made by the participants. We present the incidence of these structures and the trends of the incidence with the mass of the host galaxy and the density of its environment. We find an incidence of shells, stream and tails of approximately 15%, about the same for each category. For galaxies with masses over 1011 M⊙, the incidence of shells and streams increases about 1.7 times. We also note a strong unexpected anticorrelation of the incidence of Galactic cirrus with the environment density of the target galaxy. Correlations with other properties of the galaxies, and comparisons to model predictions, will be presented in future papers.

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A deconvolution technique to correct deep images of galaxies from instrumental scattered light

Cited by 32 publications

References 27 publications

Revisiting Stephan's Quintet with deep optical images

Revisiting Stephan's Quintet with deep optical images

Structure of Brightest Cluster Galaxies and Intracluster Light

Census and classification of low-surface-brightness structures in nearby early-type galaxies from the MATLAS survey

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