ALMA Observation of a z ? 10 Galaxy Candidate Discovered with JWST

We report the observation by the Atacama Large Millimeter/submillimeter Array (ALMA) of a z greater than or similar to 10 galaxy candidate (GHZ1) discovered from the GLASS-JWST Early Release Science Program. Our ALMA program aims to detect the [O III] emission line at the rest-frame frequency 3393.0062 GHz (88.36 mu m) and far-IR continuum emission with the spectral window setup seamlessly covering a 26.125 GHz frequency range (10.10 < z < 11.14). A total of 7 hr of on-source integration was employed, using four frequency settings to cover the full range (1.7 hr per setting), with 0 ''.7 angular resolution. No line or continuum is clearly detected, with 5 sigma upper limits on the line emission of 0.93 mJy beam(-1) at 25 km s(-1) channel(-1) and on the continuum emission of 30 mu Jy beam(-1). We report marginal spectral (at 225 km s(-1) resolution) and continuum features (4.1 sigma and 2.6 sigma peak signal-to-noise ratio, respectively), within 0 ''.17 from the JWST position of GHZ1. This spectral feature implies z = 10.38 and needs to be verified with further observations. Assuming that the best estimate of photometric redshift (z = 10.60(-0.60)(+0.52)) is correct, the model of the galaxy's broadband spectral energy distribution for the 3 sigma upper limit of the continuum flux from GHZ1 suggests that GHZ1 has a small amount of dust (M-d less than or similar to 10(4) M-circle dot) at a high temperature (T-d greater than or similar to 90 K). The 5 sigma upper limit on the [O III](88 mu m) line luminosity and the inferred star formation rate of GHZ1 are consistent with the properties of low-metallicity dwarf galaxies. We also report serendipitous clear detections of six continuum sources at the locations of the JWST galaxy counterparts in the field.