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3D physical structure and angular expansion of the remnant of the recurrent nova T Pyx
Guerrero, M. A.; Toalá, J. A.; Santamaría, E. +2 more
We present the analysis of archival Very Large Telescope (VLT) Multi-Unit Spectroscopic Explorer (MUSE) and multi-epoch Hubble Space Telescope (HST) Wide Field Planetary Camera 2 (WFPC2) and Wide Field Camera 3/Ultraviolet-Visible Imaging Spectrograph (WFC3/UVIS) narrow-band observations of the remnant associated with the ejecta of the mid-ninetee…
MEMPSEP-III. A Machine Learning-Oriented Multivariate Data Set for Forecasting the Occurrence and Properties of Solar Energetic Particle Events Using a Multivariate Ensemble Approach
Chatterjee, Subhamoy; Dayeh, Maher A.; Muñoz-Jaramillo, Andrés. +3 more
We introduce a new multivariate data set that utilizes multiple spacecraft collecting in-situ and remote sensing heliospheric measurements shown to be linked to physical processes responsible for generating solar energetic particles (SEPs). Using the Geostationary Operational Environmental Satellites (GOES) flare event list from Solar Cycle (SC) 2…
X-ray variability of SDSS quasars based on the SRG/eROSITA all-sky survey
Bikmaev, I. F.; Gilfanov, M. R.; Medvedev, P. S. +6 more
We examine the long-term (rest-frame time-scales from a few months to ~20 yr) X-ray variability of a sample of 2344 X-ray bright quasars from the Sloan Digital Sky Survey (SDSS) data release 14 quasar (DR14Q) catalogue, based on the data of the Spectrum-Roentgen-Gamma (SRG)/eROSITA All-Sky Survey complemented for ~7 per cent of the sample by archi…
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…