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Massive galaxy formation caught in action at z ∼ 5 with JWST
Greve, Thomas R.; Brammer, Gabriel B.; Toft, Sune +13 more
We report the discovery of a compact group of galaxies, CGG-z5, at z ∼ 5.2 in the EGS field covered by the JWST/CEERS survey. CGG-z5 was selected as the highest overdensity of galaxies at z > 2 in recent JWST public surveys and it consists of six candidate members lying within a projected area of 1.5″ × 3″ (10×20 kpc2). All group mem…
Moving groups across Galactocentric radius with Gaia DR3
Aguerri, J. Alfonso L.; D'Onghia, Elena; Lucchini, Scott +1 more
The kinematic plane of stars near the Sun has proven an indispensable tool for untangling the complexities of the structure of our Milky Way (MW). With ever improving data, numerous kinematic 'moving groups' of stars have been better characterized, and new ones continue to be discovered. Here we present an improved method for detecting these group…
Determining Dust Properties in Protoplanetary Disks: SED-derived Masses and Settling with ALMA
Ribas, Álvaro; Espaillat, Catherine C.; Macías, Enrique +3 more
We present spectral energy distribution (SED) modeling of 338 disks around T Tauri stars from 11 star-forming regions, ranging from ~0.5 to 10 Myr old. The disk masses we infer from our SED models are typically greater than those reported from (sub)millimeter surveys by a factor of 1.5-5, with the discrepancy being generally higher for the more ma…
The early evolution of young massive clusters. The kinematic history of NGC 6611/M16
Kaper, L.; de Koter, A.; Lamers, H. J. G. L. M. +3 more
Context. Young massive clusters provide the opportunity to study the outcome of the star formation process and the early evolution of star clusters. In the first few million years, the (massive) stars dynamically interact, producing runaways and affecting the initial (binary) population.
Aims: Observing and interpreting the dynamics of young …
Kinematics, Structure, and Mass Outflow Rates of Extreme Starburst Galactic Outflows
Moustakas, John; Coil, Alison L.; Rudnick, Gregory H. +10 more
We present results on the properties of extreme gas outflows in massive (M * ~ 1011 M ⊙), compact, starburst (star formation rate, SFR~ 200 M ⊙ yr-1) galaxies at z = 0.4-0.7 with very high star formation surface densities (ΣSFR ~ 2000 M ⊙ yr-1 kpc-2)…
The HETDEX Survey Emission-line Exploration and Source Classification
Finkelstein, Steven L.; Kollatschny, Wolfram; Gebhardt, Karl +20 more
The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) is an untargeted spectroscopic survey that aims to measure the expansion rate of the universe at z ~ 2.4 to 1% precision for both H(z) and D A (z). HETDEX is in the process of mapping in excess of one million Lyα emitting (LAE) galaxies and a similar number of lower-z galaxies …
New ASKAP radio supernova remnants and candidates in the Large Magellanic Cloud
Haberl, F.; Hill, T.; Payne, J. L. +34 more
We present a new Australian Square Kilometre Array Pathfinder (ASKAP) sample of 14 radio supernova remnants (SNR) candidates in the Large Magellanic Cloud (LMC). This new sample is a significant increase to the known number of older, larger, and low surface brightness LMC SNRs. We employ a multifrequency search for each object and found possible t…
Discovery of a Dusty, Chemically Mature Companion to a z ∼ 4 Starburst Galaxy in JWST ERS Data
Spoon, Henrik; Stacey, Gordon; Vishwas, Amit +6 more
We report the discovery of two companion sources to a strongly lensed galaxy SPT0418-47 ("ring") at redshift 4.225, targeted by the JWST Early Release Science program. We confirm that these sources are at a similar redshift to the ring based on Hα detected in the NIRSpec spectrum and [C II] λ158 µm line from the Atacama Large Millimeter/subm…
Witnessing the fragmentation of a filament into prestellar cores in Orion B/NGC 2024
André, Ph.; Arzoumanian, D.; Könyves, V. +3 more
Context. Recent Herschel observations of nearby molecular clouds have shown that filamentary structures are ubiquitous and that most prestellar cores form in dense filaments. Probing the detailed density and velocity structure of molecular filaments is therefore crucial for improving our observational understanding of the star formation process. <…
First Observations of the Brown Dwarf HD 19467 B with JWST
Johnstone, Doug; Leisenring, Jarron; Huber, Daniel +21 more
We observed HD 19467 B with JWST's NIRCam in six filters spanning 2.5–4.6 µm with the long-wavelength bar coronagraph. The brown dwarf HD 19467 B was initially identified through a long-period trend in the radial velocity of the G3V star HD 19467. HD 19467 B was subsequently detected via coronagraphic imaging and spectroscopy, and characteri…