Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pasj...60s.375t&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.60, No.SP2, pp.S375--S388
Astronomy and Astrophysics
Astronomy
16
Infrared: General, Space Vehicles: Instruments, Techniques: Photometric
Scientific paper
The absolute photometric calibration of imaging observations with the Infrared Camera (IRC) aboard the AKARI satellite was performed by monitoring the same stars regularly and by observing aset of standard stars. By our monitoring observations, we confirmed that all channels of the IRC were stable to within 4% and that their sensitivities were constant until the liquid helium was exhausted. Using the data of these repeated observations, we evaluated the intrinsic errors as afunction of the brightnesses of objects and found that the errors increase rapidly toward fainter objects. We also checked the consistency between short and long exposure times, and confirmed that the data sampling had been executed as designed. Finally, by comparing the estimated in-band flux densities and the observed data values of standard stars, we obtained conversion factors to the absolute flux densities of all the band/exposure configurations. Their absolute uncertainties are estimated to be less than 6%.
Cohen Martin
Ishihara Daisuke
Ita Yoshifusa
Kim Woojung
Matsuhara Hideo
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