Spitzer Point Source Catalogs of $\sim300,000$ Stars in Seven Nearby Galaxies

TL;DR

This paper provides comprehensive mid-infrared point-source catalogs for seven nearby galaxies, containing around 300,000 sources, which serve as valuable resources for future transient studies and JWST observation planning.

Contribution

The creation of extensive, multi-band mid-infrared point-source catalogs for seven nearby galaxies, combining PSF and aperture photometry, and making them publicly available.

Findings

Catalog contains ~300,000 sources across seven galaxies.

Sources are selected with >3σ detections at 3.6μm and 4.5μm.

Provides fluxes or upper limits at multiple IR bands.

Abstract

We present Spitzer IRAC $3.6-8$um and MIPS $24$um point-source catalogs for seven galaxies: NGC$6822$, M$33$, NGC$300$, NGC$2403$, M$81$, NGC$0247$, and NGC$7793$. The catalogs contain a total of $\sim300,000$ sources and were created by dual-band selection of sources with $>3\sigma$ detections at both $3.6$um and $4.5$um. The source lists become significantly incomplete near $m_{3.6}=m_{4.5}\simeq18$. We complement the $3.6$um and $4.5$um fluxes with $5.8$um, $8.0$um and $24$um fluxes or $3\sigma$ upper limits using a combination of PSF and aperture photometry. This catalog is a resource as an archive for studying mid-infrared transients and for planning observations with the James Webb Space Telescope.