DATA RELEASE: SMACS0723 NIRCam Imaging

In July 2022, JWST has observed the lensing cluster SMACS0723 as part of the Early Release Observations (ERO). The prgram (PID 2736) cosists of deep multi-band imaging with NIRCam and MIRI, slitless spectroscopy with NIRISS, and multi-object spectroscopy with NIRSpec. We announce the first data release of the reduced and calibrated NIRCam mosaics in 6 bands, including PSF-matched products and ICL-corrected versions. Data nd the readme file can be retrieved at this address: SMACS0723 NIRCam Data Release .

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• README

Simulated NIRSpec Spectra

To help the community prepare JWST GO proposals in deep extragalactic fields, we provide simulated NIRSpec spectra based on spectral templates built with the Beagle tool (Chevallard & Charlot 2016). The input spectra are based on a combination of a population synthesis and photoionization code, and include a physically-motivated description of line+continuum nebular emission.

A range of SFR and Mass values are explored here, as well as different redshifts, continuum magnitudes, and exposure times with the NIRSpec ETC. The low-resolution PRISM mode covers the whole spectral range (0.6-5.3 microns) is used for three galaxy templates at redshift z=6 and z=8. The high-resolution G395H grating is used at z=6 to typically observe optical emission lines, including Halpha and [OIII]5007 and Hbeta. The medium-resolution gratings G235M and G140M are used to observe emission and absorption lines in relatively bright galaxies at z=8. For each of these combinations, the data products include a plot and an ascii file for the output spectrum to assess the feasibility and quality of such observations.

Photometric Catalogs

Mock galaxy catalogs based on an empirical model of galaxy evolution and empirical constraints from galaxy surveys between 0.2 < z < 10 are available for download on the webpage of JAGUAR (JADES Extragalactic Ultra-deep Artificial Realization). More details are given in the associated publication by Williams et al. (2018), where a first application provides predictions for the upcoming JWST Advanced Deep Extragalactic Survey (JADES), a joint program of the JWST/NIRCam and NIRSpec Guaranteed Time Observations teams.

The mock galaxies (both star-forming and quiescent) follow observed galaxy stellar mass and UV luminosity functions, observed scaling relations between UV luminosity and stellar mass with realistic scatter, and feature spectral energy distributions and associated flux photometry from rest-frame wavelengths between 91 Angstroms and 190 microns.

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To help prepare more specific scientific cases, simulations of resolved galaxies within the SPHINX project are used to generate mock images in six NIRCam bands. Each band includes three different lines of sight. More details are given in the Readme file.

NIRCam

Physical Properties

All future JWST data from deep extragalactic fields will be reduced and made available to the community. In addition we will provide high-level science products such as galaxy catalogs with physical parameters derived with the SED modelling tool BEAGLE.

• BEAGLE