Search Publications
First look with JWST spectroscopy: Resemblance among z ∼ 8 galaxies and local analogs
Schaerer, D.; Marques-Chaves, R.; Brammer, G. +5 more
Deep images and near-IR spectra of galaxies in the field of the lensing cluster SMACS J0723.3−7327 were recently taken as part of the Early Release Observations (EROs) program of the James Webb Space Telescope (JWST). Among these, two NIRSpec spectra of galaxies, at z = 7.7 and at z = 8.5, were obtained, revealing, for the first time, the rest-fra…
A high angular resolution view of the PAH emission in Seyfert galaxies using JWST/MRS data
Rigopoulou, D.; García-Burillo, S.; Shimizu, T. +16 more
Polycyclic aromatic hydrocarbons (PAHs) are carbon-based molecules that are ubiquitous in a variety of astrophysical objects and environments. In this work we use JWST/MIRI MRS spectroscopy of three Seyferts to compare their nuclear PAH emission with that of star-forming (SF) regions. This study represents the first of its kind to use sub-arcsecon…
First JWST observations of a gravitational lens. Mass model from new multiple images with near-infrared observations of SMACS J0723.3−7327
Brammer, G.; Vanzella, E.; Mercurio, A. +4 more
We present our lens mass model of SMACS J0723.3−7327, the first strong gravitational lens observed by the James Webb Space Telescope (JWST). We use data from the Hubble Space Telescope and the Multi Unit Spectroscopic Explorer (MUSE) to build our `pre-JWST' lens model and then refine it with newly available JWST near-infrared imaging in our JWST m…
Low-power jet-interstellar medium interaction in NGC 7319 revealed by JWST/MIRI MRS
Colina, L.; Hönig, S. F.; García-Burillo, S. +8 more
We present JWST/MIRI MRS spectroscopy of NGC 7319, the largest galaxy in the Stephan's Quintet, observed as part of the Early Release Observations (ERO). NGC 7319 hosts a type 2 active galactic nucleus (AGN) and a low-power radio jet (L1.4 GHz = 3.3 × 1022 W Hz−1) with two asymmetric radio hotspots at 430 pc (N2) a…
A lensed protocluster candidate at z = 7.66 identified in JWST observations of the galaxy cluster SMACS0723−7327
Dole, H.; Laporte, N.; Zitrin, A. +3 more
Context. According to the current paradigm of galaxy formation, the first galaxies likely formed within large dark matter haloes. The fragmentation of these massive haloes led to the formation of galaxy protoclusters, which are usually composed of one to a few bright objects, surrounded by numerous fainter (and less massive) galaxies. These early …