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New AGN diagnostic diagrams based on the [OIII]λ4363 auroral line
Feltre, Anna; Übler, Hannah; D'Eugenio, Francesco +8 more
The James Webb Space Telescope (JWST) is revolutionizing our understanding of black hole formation and growth in the early Universe. However, JWST has also revealed that some of the classical diagnostics, such as the Baldwin, Phillips & Terlevich (BPT) diagrams and X-ray emission, often fail to identify active galactic nuclei (AGN) at high red…
The progenitor star of SN 2023ixf: a massive red supergiant with enhanced, episodic pre-supernova mass loss
Sollerman, Jesper; Perley, Daniel A.; Fremling, Christoffer +10 more
We identify the progenitor star of SN 2023ixf in Messier 101 using Keck/NIRC2 adaptive optics imaging and pre-explosion Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS) images. The supernova, localized with diffraction spikes and high-precision astrometry, unambiguously coincides with a progenitor candidate of
Negative cosmological constant in the dark energy sector: tests from JWST photometric and spectroscopic observations of high-redshift galaxies
Menci, Nicola; Sen, Anjan A.; Vagnozzi, Sunny +2 more
Early observations with the James Webb Space Telescope (JWST) have revealed the existence of an unexpectedly large abundance of extremely massive galaxies at redshifts z ≳ 5: these are in tension with the predictions not only of the standard ΛCDM cosmology, but also with those of a wide class of dynamical dark energy (DE) models, and are generally…
High-contrast JWST-MIRI Spectroscopy of Planet-forming Disks for the JDISC Survey
Zhang, Ke; Pascucci, Ilaria; Banzatti, Andrea +26 more
The JWST Disk Infrared Spectral Chemistry Survey (JDISCS) aims to understand the evolution of the chemistry of inner protoplanetary disks using the Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST). With a growing sample of >30 disks, the survey implements a custom method to calibrate the MIRI Medium Resolution Spectromete…
Evidence for a Shallow Evolution in the Volume Densities of Massive Galaxies at z = 4–8 from CEERS
Papovich, Casey; Cole, Justin W.; Yang, Guang +36 more
We analyze the evolution of massive (log10[M ⋆/M ⊙] > 10) galaxies at z ∼ 1–4 selected from JWST Cosmic Evolution Early Release Survey (CEERS). We infer the physical properties of all galaxies in the CEERS NIRCam imaging through spectral energy distribution (SED) fitting with dense basis to select a sample of hi…
MIDIS: Unveiling the Role of Strong Hα Emitters During the Epoch of Reionization with JWST
Ilbert, O.; Östlin, G.; Güdel, M. +41 more
By using an ultradeep JWST/MIRI image at 5.6 µm in the Hubble eXtreme Deep Field, we constrain the role of strong Hα emitters (HAEs) during "cosmic reionization" at z ≃ 7–8. Our sample of HAEs is comprised of young (<35 Myr) galaxies, except for one single galaxy (≈300 Myr), with low stellar masses (≲109 M ⊙). These …
Rest-frame UV Colors for Faint Galaxies at z ∼ 9–16 with the JWST NGDEEP Survey
Papovich, Casey; Finkelstein, Steven L.; Pérez-González, Pablo G. +14 more
We present measurements of the rest-frame UV spectral slope, β, for a sample of 36 faint star-forming galaxies at z ∼ 9–16 discovered in one of the deepest JWST NIRCam surveys to date, the Next Generation Deep Extragalactic Exploratory Public Survey. We use robust photometric measurements for UV-faint galaxies (down to M UV ∼ ‑16), orig…
X-Shooting ULLYSES: Massive stars at low metallicity. III. Terminal wind speeds of ULLYSES massive stars
Crowther, P. A.; Herrero, A.; Hamann, W. -R. +26 more
Context. The winds of massive stars have a significant impact on stellar evolution and on the surrounding medium. The maximum speed reached by these outflows, the terminal wind speed v∞, is a global wind parameter and an essential input for models of stellar atmospheres and feedback. With the arrival of the ULLYSES programme, a legacy U…
Investigating Protostellar Accretion-driven Outflows across the Mass Spectrum: JWST NIRSpec Integral Field Unit 3–5 µm Spectral Mapping of Five Young Protostars
Manoj, P.; Narang, Mayank; Bourke, Tyler L. +36 more
Investigating Protostellar Accretion is a Cycle 1 JWST program using the NIRSpec+MIRI integral field units to obtain 2.9–28 µm spectral cubes of five young protostars with luminosities of 0.2–10,000 L ⊙ in their primary accretion phase. This paper introduces the NIRSpec 2.9–5.3 µm data of the inner 840–9000 au with spatial r…
To High Redshift and Low Mass: Exploring the Emergence of Quenched Galaxies and Their Environments at 3 < z < 6 in the Ultra-deep JADES MIRI F770W Parallel
Parlanti, Eleonora; Carniani, Stefano; D'Eugenio, Francesco +25 more
We present the robust selection of high-redshift quiescent galaxies (QG) and poststarburst (PSB) galaxies using ultra-deep NIRCam and MIRI imaging from the JWST Advanced Deep Extragalactic Survey (JADES). At 3 < z < 6, MIRI 7.7 µm imaging provides rest-frame J band, which is commonly used to break the degeneracy between old stellar pop…