Search Publications
Lenses In VoicE (LIVE): searching for strong gravitational lenses in the VOICE@VST survey using convolutional neural networks
Vaccari, Mattia; Koopmans, Léon V. E.; Fan, Zuhui +8 more
We present a sample of 16 likely strong gravitational lenses identified in the VST Optical Imaging of the CDFS and ES1 fields (VOICE survey) using convolutional neural networks (CNNs). We train two different CNNs on composite images produced by superimposing simulated gravitational arcs on real Luminous Red Galaxies observed in VOICE. Specifically…
Constraining SIDM with halo shapes: Revisited predictions from realistic simulations of early-type galaxies
Vogelsberger, Mark; Sparre, Martin; Zavala, Jesús +3 more
We study the effect of self-interacting dark matter (SIDM) and baryons on the shape of early-type galaxies (ETGs) and their dark matter haloes, comparing them to the predictions of the cold dark matter (CDM) scenario. We use five hydrodynamical zoom-in simulations of haloes hosting ETGs ($M_{\rm vir}\sim 10^{13}\, \mathrm{M}_{\odot }$ and $M_{*}\s…
MAGAZ3NE: High Stellar Velocity Dispersions for Ultramassive Quiescent Galaxies at z ≳ 3
Cooper, M. C.; Urbano Stawinski, Stephanie M.; Muzzin, Adam +17 more
In this work, we publish stellar velocity dispersions, sizes, and dynamical masses for eight ultramassive galaxies (UMGs; $\mathrm{log}({M}_{* }/{M}_{\odot })$ > 11), z ≳ 3) from the Massive Ancient Galaxies At z > 3 NEar-infrared (MAGAZ3NE) Survey, more than doubling the number of such galaxies with velocity dispersion measurements at this …
Anomalous Cosmic Rays and Heliospheric Energetic Particles
Fichtner, H.; Leske, R. A.; Hill, M. E. +7 more
We present a review of Anomalous Cosmic Rays (ACRs), including the history of their discovery and recent insights into their acceleration and transport in the heliosphere. We focus on a few selected topics including a discussion of mechanisms of their acceleration, escape from the heliosphere, their effects on the dynamics of the heliosheath, tran…
The Drivers of the Martian Bow Shock Location: A Statistical Analysis of Mars Atmosphere and Volatile EvolutioN and Mars Express Observations
Garnier, P.; Génot, V.; Halekas, J. S. +6 more
The Martian interaction with the solar wind leads to the formation of a bow shock upstream of the planet. The shock dynamics appear complex, due to the combined influence of external and internal drivers. The extreme ultraviolet fluxes and magnetosonic Mach number are known major drivers of the shock location, while the influence of other possible…
The chemical abundance pattern of the extremely metal-poor thin disc star 2MASS J1808-5104 and its origins
Placco, Vinicius M.; Meléndez, Jorge; Roederer, Ian U. +6 more
We present a high-resolution (R ~ 35 000), high signal-to-noise (S/N = 350) Magellan/MIKE spectrum of the bright extremely metal-poor star 2MASS J1808-5104. We find [Fe/H] = -4.01 (spectroscopic LTE stellar parameters), [Fe/H] = -3.8 (photometric stellar parameters), and [Fe/H] = -3.7 (spectroscopic NLTE stellar parameters). We measured a carbon-t…
The typical width of Herschel filaments
Arzoumanian, D.; Palmeirim, P.; André, P. J.
Context. Dense molecular filaments are widely believed to be representative of the initial conditions of star formation in interstellar clouds. Characterizing their physical properties, such as their transverse size, is therefore of paramount importance. Herschel studies suggest that nearby (d < 500 pc) molecular filaments have a typical half-p…
An environmental analysis of the Type Ib SN 2019yvr and the possible presence of an inflated binary companion
Sun, Ning-Chen; Crowther, Paul A.; Zapartas, Emmanouil +5 more
SN 2019yvr is the second Type Ib supernova (SN) with a possible direct detection of its progenitor (system); however, the spectral energy distribution (SED) of the pre-explosion source appears much cooler and overluminous than an expected helium-star progenitor. Using Hubble Space Telescope (HST) images and MUSE integral-field-unit (IFU) spectrosc…
Gyrochronological dating of the stellar moving group Group X
Baratella, M.; Messina, S.; D'Orazi, V. +4 more
Context. Gyrochronology is one of the methods currently used to estimate the age of stellar open clusters. Hundreds of new clusters, associations, and moving groups unveiled by Gaia and complemented by accurate rotation period measurements provided by recent space missions such as Kepler and TESS are allowing us to significantly improve the reliab…
The eROSITA Final Equatorial-Depth Survey (eFEDS). A multiwavelength view of WISE mid-infrared galaxies/active galactic nuclei
Nandra, Kirpal; Imanishi, Masatoshi; Wada, Keiichi +21 more
Aims: We investigate the physical properties - such as the stellar mass (M*), star-formation rate, infrared (IR) luminosity (LIR), X-ray luminosity (LX), and hydrogen column density (NH) - of mid-IR (MIR) galaxies and active galactic nuclei (AGN) at z < 4 in the 140 deg2 field observed…