Reanalysis of near-infrared extragalactic background light based on the IRTS observation

TL;DR

This study reanalyzes near-infrared background data from IRTS, confirming residual isotropic emission consistent with previous findings and recent observations, and compares different zodiacal light models.

Contribution

It provides a reanalysis using updated models, confirming the presence of residual emission and comparing zodiacal light models to assess their impact.

Findings

Residual isotropic emission confirmed, slightly lower but similar to previous reports.

Emission brighter than integrated galaxy light, consistent across models.

Comparison of zodiacal light models shows slight differences in residual emission.

Abstract

We reanalyze data of near-infrared background taken by Infrared Telescope in Space (IRTS) based on up-to-date observational results of zodiacal light, integrated star light and diffuse Galactic light. We confirm the existence of residual isotropic emission, which is slightly lower but almost the same as previously reported. At wavelengths longer than 2 {\mu}m, the result is fairly consistent with the recent observation with AKARI. We also perform the same analysis using a different zodiacal light model by Wright and detected residual isotropic emission that is slightly lower than that based on the original Kelsall model. Both models show the residual isotropic emission that is significantly brighter than the integrated light of galaxies.