A 1420 MHz Catalog of Compact Sources in the Northern Galactic Plane

We present a catalog of compact sources of radio emission at 1420 MHz in the northern Galactic plane from the Canadian Galactic Plane Survey. The catalog contains 72,787 compact sources with angular size less than 3$'$ within the Galactic longitude range $52^{\circ} < \ell < 192^{\circ}$ down to a 5$\sigma$ detection level of $\sim$1.2 mJy. Linear polarization properties are included for 12,368 sources with signals greater than 4$\sigma_{QU}$ in the CGPS Stokes $Q$ and $U$ images at the position of the total intensity peak. We compare CGPS flux densities with cataloged flux densities in the Northern VLA Sky Survey catalog for 10,897 isolated unresolved sources with CGPS flux density greater than 4 mJy to search for sources that show variable flux density on time scales of several years. We identify 146 candidate variables that exhibit high fractional variations between the two surveys. In addition we identify 13 candidate transient sources that have CGPS flux density above 10\,mJy but are not detected in the NVSS.