Characterization and improvement of the image quality of the data taken with the infrared Camera (IRC) mid-infrared channels on Board AKARI

Ko Arimatsu, Takashi Onaka, Itsuki Sakon, Shinki Oyabu, Yoshifusa Ita, Toshihiko Tanabé, Daisuke Kato, Fumi Egusa, Takehiko Wada, Hideo Matsuhara

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Mid-infrared images frequently suffer artifacts and extended point-spread functions (PSFs). We investigate the characteristics of the artifacts and the PSFs in images obtained with the infrared camera (IRC) on board AKARI at four mid-infrared bands of the S7 (7 μm), S11 (11 μm), L15 (15 μm), and L24 (24 μm). Removal of the artifacts significantly improves the reliability of the reference data for flat-fielding at the L15 and L24 bands. A set of models of the IRC PSFs is also constructed from on-orbit data. These PSFs have extended components that come from diffraction and scattering within the detector arrays.We estimate the aperture correction factors for point sources and the surface brightness correction factors for diffuse sources. We conclude that the surface brightness correction factors range from 0.95 to 0.8, taking account of the extended component of the PSFs. To correct for the extended PSF effects for the study of faint structures, we also develop an image reconstruction method, which consists of the deconvolution with the PSF and the convolution with an appropriate Gaussian. The appropriate removal of the artifacts, improved flat-fielding, and image reconstruction with the extended PSFs enable us to investigate detailed structures of extended sources in IRC mid-infrared images.

Original languageEnglish
Pages (from-to)981-995
Number of pages15
JournalPublications of the Astronomical Society of the Pacific
Volume123
Issue number906
DOIs
Publication statusPublished - 2011 Aug

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Characterization and improvement of the image quality of the data taken with the infrared Camera (IRC) mid-infrared channels on Board AKARI'. Together they form a unique fingerprint.

Cite this