A catalog of mid-infrared sources in the Extended Groth Strip

TL;DR

This paper presents a comprehensive catalog of over 57,000 mid-infrared sources in the Extended Groth Strip, revealing diverse galaxy populations and providing valuable data for extragalactic studies.

Contribution

It provides one of the largest IRAC source catalogs in the EGS with detailed photometry and color analysis, enhancing understanding of galaxy populations at various redshifts.

Findings

Catalog contains 57,434 objects detected at 3.6 um.

Source populations include star-forming, quiescent, and high-redshift galaxies.

Number counts align with other Spitzer surveys.

Abstract

The Extended Groth Strip (EGS) is one of the premier fields for extragalactic deep surveys. Deep observations of the EGS with the Infrared Array Camera (IRAC) on the Spitzer Space Telescope cover an area of 0.38 square degrees to a 50% completeness limit of 1.5 uJy at 3.6 um. The catalog comprises 57434 objects detected at 3.6 um, with 84%, 28%, and 24% also detected at 4.5, 5.8, and 8.0 um. Number counts are consistent with results from other Spitzer surveys. Color distributions show that the EGS IRAC sources comprise a mixture of populations: low-redshift star-forming galaxies, quiescent galaxies dominated by stellar emission at a range of redshifts, and high redshift galaxies and AGN.