Search Publications
The broken-exponential radial structure and larger size of the Milky Way galaxy
Imig, Julie; Chen, Bingqiu; Wang, Tao +4 more
The radial structure of a galaxy is a fundamental property that reflects its growth and assembly history. Although it is straightforward to measure that of external galaxies, it is challenging for the Milky Way because of our inside perspective. Traditionally, the radial structure of the Milky Way has been assumed to be characterized by a single-e…
JWST MIRI MRS Images of Disk Winds, Water, and CO in an Edge-on Protoplanetary Disk
van Dishoeck, E. F.; Melnick, G. J.; Boogert, A. C. A. +14 more
We present JWST MIRI MRS observations of the edge-on protoplanetary disk around the young subsolar-mass star Tau 042021, acquired as part of the Cycle 1 GO program "Mapping Inclined Disk Astrochemical Signatures." These data resolve the mid-IR spatial distributions of H2, revealing X-shaped emission extending to ∼200 au above the disk m…
NGDEEP Epoch 1: Spatially Resolved Hα Observations of Disk and Bulge Growth in Star-forming Galaxies at z ∼ 0.6–2.2 from JWST NIRISS Slitless Spectroscopy
Papovich, Casey; Finkelstein, Steven L.; Pérez-González, Pablo G. +21 more
We study the Hα equivalent width (EW(Hα)) maps of 19 galaxies at 0.6 < z < 2.2 in the Hubble Ultra Deep Field using NIRISS slitless spectroscopy as part of the Next Generation Deep Extragalactic Exploratory Public Survey. Our galaxies mostly lie on the star formation main sequence with stellar masses between 109 and 1011
A flexible deep learning crater detection scheme using Segment Anything Model (SAM)
Giannakis, Iraklis; Bhardwaj, Anshuman; Sam, Lydia +1 more
Craters are one of the most important morphological features in planetary exploration. To that extent, detecting, mapping and counting craters is a mainstream process in planetary science, done primarily manually, which is a very laborious, time-consuming and inconsistent process. Recently, machine learning (ML) and computer vision have been succe…
MINDS: The DR Tau disk. I. Combining JWST-MIRI data with high-resolution CO spectra to characterise the hot gas
Henning, Thomas; Waters, L. B. F. M.; Güdel, Manuel +29 more
Context. The MRS mode of the JWST-MIRI instrument has been shown to be a powerful tool to characterise the molecular gas emission of the inner region of planet-forming disks. Investigating their spectra allows us to infer the composition of the gas in these regions and, subsequently, the potential atmospheric composition of the forming planets. We…
TREASUREHUNT: Transients and Variability Discovered with HST in the JWST North Ecliptic Pole Time-domain Field
Im, M.; Ryan, R. E.; Grogin, Norman A. +56 more
The James Webb Space Telescope (JWST) North Ecliptic Pole (NEP) Time-domain Field (TDF) is a >14' diameter field optimized for multiwavelength time-domain science with JWST. It has been observed across the electromagnetic spectrum both from the ground and from space, including with the Hubble Space Telescope (HST). As part of HST observations o…
Discrepancies in the Properties of a Coronal Mass Ejection on Scales of 0.03 au as Revealed by Simultaneous Measurements at Solar Orbiter and Wind: The 2021 November 3–5 Event
Farrugia, C. J.; Davies, E. E.; Yu, W. +4 more
Simultaneous in situ measurements of coronal mass ejections (CMEs), including both plasma and magnetic field, by two spacecraft in radial alignment have been extremely rare. Here, we report on one such CME measured by Solar Orbiter (SolO) and Wind on 2021 November 3–5, while the spacecraft were radially separated by a heliocentric distance of 0.13…
New 511 keV Line Data Provide Strongest sub-GeV Dark Matter Constraints
Silk, Joseph; De la Torre Luque, Pedro; Balaji, Shyam
We explore the 511 keV emission associated with sub-GeV dark matter (DM) particles that can produce electron–positron pairs and form positronium after thermalizing. We use ∼16 yr of data from the Spectrometer on INTEGRAL to constrain DM properties, including the full positron propagation and losses, and the suppression of free electron density awa…
Fast-rotating massive Population III stars as possible sources of extreme N enrichment in high-redshift galaxies
Sibony, Yves; Nandal, Devesh; Tsiatsiou, Sophie
We present an analysis of the chemical compositions in high-redshift galaxies, with a focus on the nitrogen-enhanced galaxies GN-z11 and CEERS-1019. We used stellar models of massive stars with initial masses ranging from 9 to 120 M⊙ and various metallicities to deduce the chemical abundances of stellar ejecta for a few light elements (…
JWST NIRSpec High-resolution Spectroscopy of MACS0647–JD at z = 10.167: Resolved [O II] Doublet and Electron Density in an Early Galaxy
Hutchison, Taylor A.; Larson, Rebecca L.; Conselice, Christopher J. +26 more
We present JWST/NIRSpec high-resolution G395H/F290LP spectroscopy of MACS0647‑JD, a gravitationally lensed galaxy merger at z = 10.167. The new spectroscopy, which is acquired for the two lensed images (JD1 and JD2), detects and resolves emission lines in the rest-frame ultraviolet and blue optical, including the resolved [O II] λ λ3726, 3729 doub…