# Near-Infrared Survey and Photometric Redshifts in the Extended GOODS-North field

## TL;DR

This paper presents deep near-infrared imaging and a comprehensive photometric redshift catalog in the GOODS-North field, improving redshift accuracy especially for AGN sources by using hybrid templates.

## Contribution

It introduces new deep J and H-band images, a large multi-band photometric catalog, and enhanced photometric redshift methods incorporating AGN-galaxy hybrid templates.

## Key findings

- Achieved a photometric redshift accuracy of σ_NMAD=0.036 for non-X-ray sources.
- Matched 658 out of 683 X-ray sources with counterparts, including AGNs.
- Provided more accurate redshifts for X-ray sources than previous catalogs.

## Abstract

We present deep $J$ and $H$-band images in the extended Great Observatories Origins Deep Survey-North (GOODS-N) field covering an area of 0.22 $\rm{deg}^{2}$. The observations were taken using WIRCam on the 3.6-m Canada France Hawaii Telescope (CFHT). Together with the reprocessed $K_{\rm s}$-band image, the $5\sigma$ limiting AB magnitudes (in 2" diameter apertures) are 24.7, 24.2, and 24.4 AB mag in the $J$, $H$, and $K_{\rm s}$ bands, respectively. We also release a multi-band photometry and photometric redshift catalog containing 93598 sources. For non-X-ray sources, we obtained a photometric redshift accuracy $\sigma_{\mathrm{NMAD}}=0.036$ with an outlier fraction $\eta = 7.3\%$. For X-ray sources, which are mainly active galactic nuclei (AGNs), we cross-matched our catalog with the updated 2M-CDFN X-ray catalog from Xue et al. (2016) and found that 658 out of 683 X-ray sources have counterparts. $GALEX$ UV data are included in the photometric redshift computation for the X-ray sources to give $\sigma_{\mathrm{NMAD}} = 0.040$ with $\eta=10.5\%$. Our approach yields more accurate photometric redshift estimates compared to previous works in this field. In particular, by adopting AGN-galaxy hybrid templates, our approach delivers photometric redshifts for the X-ray counterparts with fewer outliers compared to the 3D-HST catalog, which fit these sources with galaxy-only templates.