Galactic Plane Infrared Polarization Survey: Data Release 4

The Galactic Plane Infrared Polarization Survey (GPIPS) used the Mimir near-infrared instrument to survey stellar linear polarization in the H-band (1.6 microns) from Galactic longitude 18 to 56 degrees and latitudes -1 to +1 degrees as 3,237 individual pointings of the 10x10 arcmin field of view of the instrument. This file presents values and uncertainties for Mimir H-band photometry and linear polarimetry for over 13 million stars across this portion of the northern Milky Way. Each of the 13,861,329 stars represented in the file has new H-band photometry reported. Of these, 8,486,028 have linear polarimetry reported. In addition, matching Gaia, 2MASS, GLIMPSE, and WISE matching photometry, parallax, and proper motion values are listed for the tabulated stars. Details regarding the data, data processing, and contents of the file contents may be found in the Astrophysical Journal Supplements article Clemens et al. (2020; DOI 10.3847/1538-4365/ab9f30).