James Webb Space Telescope Feed Post

Hidden giants in JWST's PEARLS: An ultra-massive z = 4.26 sub-millimeter galaxy that is invisible to HST

A three-color JWST NIRCam image of a 100" x 100" region (North top, East to the left) around the z = 0.35 cluster A 1489 (where F090W+F150W is shown as blue, F200W+F277W is green and F356W+F444W is red). Signal-to-noise contours are shown, representing the SCUBA-2 850 µm emission (starting at 5s, in 5s increments, 14."5 FWHM beam), the SCUBA-2 450 µm emission (3s and 4s, 7."5 FWHM beam), and the NOEMA 3-mm continuum emission (10s, ~ 5'' FWHM beam). 850.1 and 850.2 are the two bright sources visible at 450 um, 850 um, and 3 mm to the north east of the cluster core, which is identified by several bright elliptical galaxies, as well as associated strong lensing features.