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The debris of the 'last major merger' is dynamically young
Horta, Danny; Sanderson, Robyn; Donlon, Thomas +4 more
The Milky Way's (MW) inner stellar halo contains an [Fe/H]-rich component with highly eccentric orbits, often referred to as the 'last major merger.' Hypotheses for the origin of this component include Gaia-Sausage/Enceladus (GSE), where the progenitor collided with the MW proto-disc 8-11 Gyr ago, and the Virgo Radial Merger (VRM), where the proge…
A SPectroscopic Survey of Biased Halos In the Reionization Era (ASPIRE): Broad-line AGN at z = 4‑5 Revealed by JWST/NIRCam WFSS
Hennawi, Joseph F.; Shen, Yue; Fan, Xiaohui +33 more
Low-luminosity active galactic nuclei (AGNs) with low-mass black holes (BHs) in the early universe are fundamental to understanding the BH growth and their coevolution with the host galaxies. Utilizing JWST NIRCam Wide Field Slitless Spectroscopy, we perform a systematic search for broad-line Hα emitters (BHAEs) at z ≈ 4–5 in 25 fields of the A SP…
Star Formation at the Epoch of Reionization with CANUCS: The Ages of Stellar Populations in MACS1149-JD1
Harshan, Anishya; Martis, Nicholas S.; Rihtaršič, Gregor +15 more
We present measurements of stellar populations properties of a z = 9.1 gravitationally lensed galaxy MACS1149-JD1 using deep James Webb Space Telescope NIRISS slitless spectroscopy as well as NIRISS and NIRCam imaging from the CAnadian NIRISS Unbiased Cluster Survey (CANUCS). The galaxy is split into four components. Three magnified (µ ~ 11)…
GOALS-JWST: Gas Dynamics and Excitation in NGC 7469 Revealed by NIRSpec
Inami, Hanae; Böker, Torsten; Law, David R. +36 more
We present new JWST NIRSpec integral field spectroscopy (IFS) data for the luminous infrared galaxy NGC 7469, a nearby (70.6 Mpc) active galaxy with a Seyfert 1.5 nucleus that drives a highly ionized gas outflow and a prominent nuclear star-forming ring. Using the superb sensitivity and high spatial resolution of the JWST instrument NIRSpec IFS, w…
Local primordial non-Gaussianity from the large-scale clustering of photometric DESI luminous red galaxies
Miquel, Ramon; Sanchez, Eusebio; Font-Ribera, Andreu +46 more
We use angular clustering of luminous red galaxies from the Dark Energy Spectroscopic Instrument (DESI) imaging surveys to constrain the local primordial non-Gaussianity parameter fNL. Our sample comprises over 12 million targets, covering 14 000 deg2 of the sky, with redshifts in the range 0.2 < z < 1.35. We identify G…
The Sunburst Arc with JWST: I. Detection of Wolf-Rayet stars injecting nitrogen into a low-metallicity, z = 2.37 proto-globular cluster leaking ionizing photons
Dahle, H.; Rigby, J. R.; Bayliss, M. B. +13 more
We report the detection of a population of Wolf-Rayet (WR) stars in the Sunburst Arc, a strongly gravitationally lensed galaxy at redshift z = 2.37. As the brightest known lensed galaxy, the Sunburst Arc has become an important cosmic laboratory for studying star and cluster formation, Lyman α (Lyα) radiative transfer, and Lyman continuum (LyC) es…
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. V. Do Self-consistent Atmospheric Models Represent JWST Spectra? A Showcase with VHS 1256–1257 b
Henning, Thomas; Fortney, Jonathan J.; Carter, Aarynn L. +119 more
The unprecedented medium-resolution (R λ ∼ 1500–3500) near- and mid-infrared (1–18 µm) spectrum provided by JWST for the young (140 ± 20 Myr) low-mass (12–20 M Jup) L–T transition (L7) companion VHS 1256 b gives access to a catalog of molecular absorptions. In this study, we present a comprehensive analysis of this da…
Mapping Obscured Star Formation in the Host Galaxy of FRB 20201124A
Kilpatrick, Charles D.; Simha, Sunil; Prochaska, J. Xavier +23 more
We present high-resolution 1.5-6 GHz Karl G. Jansky Very Large Array and Hubble Space Telescope (HST) optical and infrared observations of the extremely active repeating fast radio burst (FRB) FRB 20201124A and its barred spiral host galaxy. We constrain the location and morphology of star formation in the host and search for a persistent radio so…
Standard siren measurement of the Hubble constant using GW170817 and the latest observations of the electromagnetic counterpart afterglow
Palmese, A.; Margutti, R.; Hajela, A. +3 more
We present a new constraint on the Hubble constant H0 using the latest measurements of the electromagnetic counterpart to the gravitational wave (GW) event GW170817. We use the latest optical, x-ray and radio observations of the afterglow up to ∼3.5 years after the GW detection, and properly take into account the impact of the host gala…
A Large and Variable Leading Tail of Helium in a Hot Saturn Undergoing Runaway Inflation
Vanderburg, Andrew; Cochran, William D.; Mahadevan, Suvrath +14 more
Atmospheric escape shapes the fate of exoplanets, with statistical evidence for transformative mass loss imprinted across the mass–radius–insolation distribution. Here, we present transit spectroscopy of the highly irradiated, low-gravity, inflated hot Saturn HAT-P-67 b. The Habitable Zone Planet Finder spectra show a detection of up to 10% absorp…