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Automated distant galaxy merger classifications from Space Telescope images using the Illustris simulation
Torrey, Paul; Rodriguez-Gomez, Vicente; Vogelsberger, Mark +5 more
We present image-based evolution of galaxy mergers from the Illustris cosmological simulation at 12 time-steps over 0.5 < z < 5. To do so, we created approximately one million synthetic deep Hubble Space Telescope and James Webb Space Telescope images and measured common morphological indicators. Using the merger tree, we assess methods to o…
Gaia Data Release 2 catalogue of extremely low-mass white dwarf candidates
Pelisoli, Ingrid; Vos, Joris
Extremely low-mass white dwarf stars (ELMs) are M < 0.3 M⊙ helium-core white dwarfs born either as a result of a common-envelope phase or after a stable Roche lobe overflow episode in a multiple system. The Universe is not old enough for ELMs to have formed through single-star evolution channels. As remnants of binary evolution, ELMs…
Machine-learning Regression of Stellar Effective Temperatures in the Second Gaia Data Release
Bai, Yu; Wang, Song; Liu, JiFeng +2 more
This paper reports on the application of the supervised machine-learning algorithm to the stellar effective temperature regression for the second Gaia data release, based on the combination of the stars in four spectroscopic surveys: the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, Sloan Extension for Galactic Understanding and Explo…
The COS CGM Compendium. II. Metallicities of the Partial and Lyman Limit Systems at z ≲ 1
Lehner, Nicolas; Howk, J. Christopher; O'Meara, John M. +3 more
We present the results from our COS circumgalactic medium (CGM) compendium (CCC), a survey of the CGM at z ≲ 1 using H I-selected absorbers with 15 < {log}{N}{{H}{{I}}} < 19. We focus here on 82 partial Lyman limit systems (pLLSs, 16.2 ≤ {log}{N}{{H}{{I}}} < 17.2) and 29 LLSs (17.2 ≤ {log}{N}{{H}{{I}}} <…
The High-Resolution Coronal Imager, Flight 2.1
Tiwari, Sanjiv K.; Golub, Leon; Winebarger, Amy R. +49 more
The third flight of the High-Resolution Coronal Imager (Hi-C 2.1) occurred on May 29, 2018; the Sounding Rocket was launched from White Sands Missile Range in New Mexico. The instrument has been modified from its original configuration (Hi-C 1) to observe the solar corona in a passband that peaks near 172 Å, and uses a new, custom-built low-noise …
unWISE Coadds: The Five-year Data Set
Lang, D.; Schlafly, E. F.; Meisner, A. M. +1 more
We present full-sky coadded maps created by uniformly combining the first five years of Wide-field Infrared Survey Explorer (WISE) and NEOWISE imaging at 3.4 µm (W1) and 4.6 µm (W2). By incorporating both pre-hibernation WISE exposures from 2010 to 2011 and the first four years (2013-2017) of post-hibernation exposures from the NEOWISE…
The MUSE Ultra Deep Field (MUDF). II. Survey design and the gaseous properties of galaxy groups at 0.5 < z < 1.5
Smail, I.; Cristiani, S.; D'Odorico, V. +12 more
We present the goals, design, and first results of the MUSE Ultra Deep Field (MUDF) survey, a large programme using the Multi Unit Spectroscopic Explorer (MUSE) instrument at the ESO Very Large Telescope. The MUDF survey is collecting ≈150 h on-source of integral field optical spectroscopy in a 1.5 × 1.2 arcmin2 region which hosts sever…
The AGN fuelling/feedback cycle in nearby radio galaxies I. ALMA observations and early results
Davis, Timothy A.; Bureau, Martin; Mignano, Arturo +7 more
This is the first paper of a series exploring the multifrequency properties of a sample of 11 nearby low-excitation radio galaxies (LERGs) in the southern sky. We are conducting an extensive study of different galaxy components (stars, warm and cold gas, radio jets) with the aim of improving our understanding of the active galactic nucleus (AGN) f…
Evidence for Sub-Chandrasekhar Type Ia Supernovae from Stellar Abundances in Dwarf Galaxies
Kovalev, Mikhail; McWilliam, Andrew; Shen, Ken J. +6 more
There is no consensus on the progenitors of Type Ia supernovae (SNe Ia) despite their importance for cosmology and chemical evolution. We address this question using our previously published catalogs of Mg, Si, Ca, Cr, Fe, Co, and Ni abundances in dwarf galaxy satellites of the Milky Way (MW) to constrain the mass at which the white dwarf (WD) exp…
The RWST, a comprehensive statistical description of the non-Gaussian structures in the ISM
Boulanger, F.; Levrier, F.; Zhang, S. +5 more
The interstellar medium (ISM) is a complex nonlinear system governed by the interplay between gravity and magneto-hydrodynamics, as well as radiative, thermodynamical, and chemical processes. Our understanding of it mostly progresses through observations and numerical simulations, and a quantitative comparison between these two approaches requires…