Re-calibration of SDF/SXDS Photometric Catalogs of Suprime-Cam with SDSS Data Release 8

TL;DR

This paper recalibrates the photometric data of the SDF and SXDS catalogs using SDSS DR8, identifying and correcting zero point offsets to improve consistency across surveys.

Contribution

It provides the first detailed recalibration of SDF and SXDS catalogs based on SDSS DR8, quantifying zero point offsets and enhancing data reliability.

Findings

Confirmed a 0.12 mag offset in B-band between SDF and SXDS.

Identified zero point offsets of ~0.10 mag in i-band and ~0.14 mag in z-band.

Reported specific zero point corrections for five filter bands.

Abstract

We present photometric recalibration of the Subaru Deep Field (SDF) and Subaru/XMM-Newton Deep Survey (SXDS). Recently, Yamanoi et al. (2012) suggested the existence of a discrepancy between the SDF and SXDS catalogs. We have used the Sloan Digital Sky Survey (SDSS) Data Release 8 (DR8) catalog and compared stars in common between SDF/SXDS and SDSS. We confirmed that there exists a 0.12 mag offset in B-band between the SDF and SXDS catalogs. Moreover, we found that significant zero point offsets in i-band (~ 0.10 mag) and z-band (~ 0.14 mag) need to be introduced to the SDF/SXDS catalogs to make it consistent with the SDSS catalog. We report the measured zero point offsets of five filter bands of SDF/SXDS catalogs. We studied the potential cause of these offsets, but the origins are yet to be understood.