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Paper: On the Removal of Point and Extended Sources from NIR Image Data of the AKARI’s NEP Monitor Field
Volume: 418, AKARI, a Light to Illuminate the Misty Universe
Page: 539
Authors: Seo, H. J.; Matsumoto, T.; Lee, H. M.; Wada, T.; Matsuura, S.; Oyabu, S.; Matsuhara, H.
Abstract: The imaging data resulting from deep sky observations contain the diffuse component coming from the foreground medium and from unresolved faint objects. AKARI has made very deep imaging observations of a ‘Monitor Field’ near the North Ecliptic Pole (NEP) to check the stability of the instruments. We have created diffuse maps from this data by removing the contributions from known point and extended sources, by applying a 2σ clipping method to remove the bright resolved objects. However, we find excess signals around the rims of the clipped regions that are believed to be due to contributions by the outer parts of the point spread function (PSF), which could then be further removed by careful modeling of the PSF. We have further modeled the extended objects using high resolution near infrared images taken by large aperture ground based telescopes. From this technique, we have generated NIR images of extended sources by convolving a high resolution IR image with the NIR PSF of AKARI, and obtained diffuse images which can be used to study the foreground and background emission.
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