Search Publications
DUVET: Resolved direct metallicity measurements in the outflow of starburst galaxy NGC 1569
Cameron, Alex J.; Kacprzak, Glenn G.; Chisholm, John +15 more
We present the results of direct-method metallicity measurements in the disc and outflow of the low-metallicity starburst galaxy NGC 1569. We use Keck Cosmic Web Imager observations to map the galaxy across 54″ (800 pc) along the major axis and 48″ (700 pc) along the minor axis with a spatial resolution of 1″ (~15 pc). We detect common strong emis…
Insight from the Noachian-aged fractured crust to the volcanic evolution of Mars: A case study from the Thaumasia graben and Claritas Fossae
Hauber, Ernst; Stephan, Katrin; Pieterek, Bartosz +1 more
Although most of the large volcanic landforms on Mars have been extensively studied, this is not the case for kilometer-sized landforms whose origin remains uncertain and which might provide important insights into the evolution of Martian volcanism. Previously, different populations of small-scale putative scoria cone volcanoes have been describe…
Eridanus III and DELVE 1: Carbon-rich Primordial Star Clusters or the Smallest Dwarf Galaxies?
Cerny, William; Li, Ting S.; Hansen, Terese T. +8 more
We present spectroscopy of the ultra-faint Milky Way satellites Eridanus III (Eri III) and DELVE 1. We identify eight member stars in each satellite and place nonconstraining upper limits on their velocity and metallicity dispersions. The brightest star in each object is very metal poor, at [Fe/H] = ‑3.1 for Eri III and [Fe/H] = ‑2.8 for DELVE 1. …
First Direct Evidence for Keplerian Rotation in Quasar Inner Broad-line Regions
Kaspi, S.; Muñoz, J. A.; Mediavilla, E. +4 more
We introduce a novel method to derive rotation curves with light-day spatial resolution of the inner regions of lensed quasars. We aim to probe the kinematics of the inner part of the broad-line region by resolving the microlensing response—a proxy for the size of the emitting region—in the wings of the broad emission lines. Specifically, we asses…
An Analysis of Active Galactic Nucleus–driven Outflows in the Seyfert 1 Galaxy NGC 3227
Fischer, Travis C.; Riffel, Rogemar A.; Crenshaw, D. Michael +8 more
We have characterized the ionized, neutral, and warm molecular gas kinematics in the Seyfert 1 galaxy NGC 3227 using observations from the Hubble Space Telescope Space Telescope Imaging Spectrograph, Apache Point Observatory's Kitt Peak Ohio State Multi-Object Spectrograph, Gemini-North's Near-Infrared Integral Field Spectrometer, and the Atacama …
Little evolution of dust emissivity in bright infrared galaxies from 2 < z < 6
Ivison, R. J.; Arumugam, V.; Eales, S. A. +1 more
Variations in the dust emissivity index, $\beta$, within and between galaxies, are evidence that the chemistry and physics of dust must vary on large scales, although the nature of the physical and/or chemical variations is still unknown. In this paper, we estimate values of $\beta$ and dust temperature for a sample of 109 dusty star-forming galax…
Connecting Lyα and Ionizing Photon Escape in the Sunburst Arc
Hutchison, Taylor A.; Mahler, Guillaume; Chisholm, John +17 more
We investigate the Lyα and Lyman continuum (LyC) properties of the Sunburst Arc, a z = 2.37 gravitationally lensed galaxy with a multiply imaged, compact region leaking LyC and a triple-peaked Lyα profile indicating direct Lyα escape. Non-LyC-leaking regions show a redshifted Lyα peak, a redshifted and central Lyα peak, or a triple-peaked Lyα prof…
Low-mass Stellar and Substellar Content of the Young Cluster Berkeley 59
Samal, Manash R.; Sharma, Saurabh; Panwar, Neelam +4 more
We present a multiwavelength analysis of the young star cluster Berkeley 59, based on Gaia data and deep IR observations with the 3.58 m Telescopio Nazionale Galileo and Spitzer space telescope. The mean proper motion of the cluster is found to be µ α cosδ ∼ ‑0.63 mas yr‑1 and µ δ ∼ ‑1.83 mas yr…
BSEC Method for Unveiling Open Clusters and its Application to Gaia DR3: 83 New Clusters
Li, Zhong-Mu; Mao, Cai-Yan
Open clusters (OCs) are common in the Milky Way, but most of them remain undiscovered. There are numerous techniques, including some machine-learning algorithms, available for the exploration of OCs. However, each method has its limitations and therefore, different approaches to discovering OCs hold significant values. We develop a comprehensive a…
The role of magnetar transient activity in time-domain and multimessenger astronomy
Younes, George; Negro, Michela; Burns, Eric +3 more
Time-domain and multimessenger astronomy (TDAMM) involves the study of transient and time-variable phenomena across various wavelengths and messengers. The Astro2020 Decadal Survey has identified TDAMM as the top priority for NASA in this decade, emphasizing its crucial role in advancing our understanding of the universe and driving new discoverie…