James Webb Space Telescope Feed Post

PEARLS: Near Infrared Photometry in the JWST North Ecliptic Pole Time Domain Field Published: 8/31/2023 7:29:17 PM Updated: 8/31/2023 7:29:17 PM

Paper abstract: We present Near-Infrared (NIR) ground-based Y, J, H, and K imaging obtainedin the James Webb Space Telescope North Ecliptic Pole Time Domain Field (TDF)using the MMT-Magellan Infrared Imager and Spectrometer (MMIRS) on theMMT.These new observations cover a field of approximately 230 arcmin^2 in Y, H,and K and 313 arcmin^2 in J. Using Monte Carlo simulations we estimate a 1sigma depth relative to the background sky of (Y, J, H, K}) = (23.80, 23.53,23.13, 23.28) in AB magnitudes for point sources at a 95% completeness level.These observations are part of the ground-based effort to characterize thisregion of the sky, supplementing space-based data obtained with Chandra,NuSTAR, XMM, AstroSat, HST, and JWST. This paper describes the observations andreduction of the NIR imaging and combines these NIR data with archival imagingin the visible, obtained with the Subaru Hyper-Suprime-Cam, to produce a mergedcatalog of 57,501 sources. The new observations reported here, plus thecorresponding multi-wavelength catalog, will provide a baseline for time-domainstudies of bright sources in the TDF.