The JCMT SCUBA-2 Survey of the James Webb Space Telescope North Ecliptic Pole Time-Domain Field

초록

The James Webb Space Telescope Time-Domain Field (JWST-TDF) is an similar to 14 ' diameter field near the North Ecliptic Pole that will be targeted by one of the JWST Guaranteed Time Observations programs. Here, we describe our James Clerk Maxwell Telescope SCUBA-2 850 mu m imaging of the JWST-TDF and present the submillimeter source catalog and properties. We also present a catalog of radio sources from Karl J. Jansky Very Large Array 3 GHz observations of the field. These observations were obtained to aid JWST's study of dust-obscured galaxies that contribute significantly to cosmic star formation at high redshifts. Our deep 850 mu m map covers the JWST-TDF at a noise level of sigma (850 mu m) = 1.0 mJy beam(-1), detecting 83/31 sources in the main/supplementary signal-to-noise ratio (S/N > 4 / S/N = 3.5-4) sample, respectively. The 3 GHz observations cover a 24 ' diameter field with a 1 sigma noise of 1 mu Jy beam(-1) at a 0.'' 7 FWHM. We identified eighty-five 3 GHz counterparts to sixty-six 850 mu m sources and then matched these with multiwavelength data from the optical to the mid-infrared wave bands. We performed spectral energy distribution fitting for 61 submillimeter galaxies (SMGs) matched with optical/near-infrared data, and found that SMGs at S/N > 4 have a median value of z (phot) = 2.22 +/- 0.12, star formation rates of 300 +/- 40 M (circle dot) yr(-1) (Chabrier initial mass function), and typical cold dust masses of 5.9 +/- 0.7 x 10(8) M (circle dot), in line with bright SMGs from other surveys. The large cold dust masses indicate correspondingly large cool gas masses, which we suggest are a key factor necessary to drive the high star formation rates seen in this population.

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