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A bottom-up search for Lyman-continuum leakage in the Hubble Ultra Deep Field
Hayes, M.; Melinder, J.; Rivera-Thorsen, T. E.
Context. When studying the production and escape of Lyman continuum (LyC) from galaxies, it is standard to rely on an array of indirect observational tracers in the preselection of candidate leakers.
Aims: In this work, we investigate how much ionizing radiation might be missed due to these selection criteria by completely removing them and p…
Photoionized Herbig-Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy - III. HH 514
Henney, W. J.; Méndez-Delgado, J. E.; García-Rojas, J. +1 more
We analyse the physical conditions and chemical composition of the photoionized Herbig-Haro object HH 514, which emerges from the protoplanetary disc (proplyd) 170-337 in the core of the Orion Nebula. We use high-spectral resolution spectroscopy from Ultraviolet and Visual Echelle Spectrograph at the Very Large Telescope and IFU-spectra from MEGAR…
New Time-resolved, Multi-band Flares in the GJ 65 System with gPhoton
Brasseur, C. E.; Osten, Rachel A.; Fleming, Scott W. +2 more
Characterizing the distribution of flare properties and occurrence rates is important for understanding habitability of M-dwarf exoplanets. The Galaxy Evolution Explorer (GALEX) space telescope observed the GJ 65 system, composed of the active, flaring M stars BL Cet and UV Cet, for 15,900 s (~4.4 hr) in two ultraviolet (UV) bands. The contrast in…
Deep Generative Modeling of Periodic Variable Stars Using Physical Parameters
Bloom, Joshua S.; Martínez-Palomera, Jorge; Abrahams, Ellianna S.
The ability to generate physically plausible ensembles of variable sources is critical to the optimization of time domain survey cadences and the training of classification models on data sets with few to no labels. Traditional data augmentation techniques expand training sets by reenvisioning observed exemplars, seeking to simulate observations o…
The first seven months of the 2020 X-ray outburst of the magnetar SGR J1935+2154
Tiengo, A.; Mereghetti, S.; Rea, N. +10 more
The magnetar SGR J1935+2154 underwent a new active episode on 2020 April 27-28, when a forest of hundreds of X-ray bursts and a large enhancement of the persistent flux were detected. For the first time, a radio burst with properties similar to those of fast radio bursts and with a X-ray counterpart was observed from this source, showing that magn…
Ejection-accretion connection in NLS1 AGN 1H 1934-063
Cusumano, G.; Fabian, A. C.; Pinto, C. +7 more
Accretion and ejection of matter in active galactic nuclei (AGNs) are tightly connected phenomena and represent fundamental mechanisms regulating the growth of the central supermassive black hole and the evolution of the host galaxy. However, the exact physical processes involved are not yet fully understood. We present a high-resolution spectral …
Bridging the gap between Monte Carlo simulations and measurements of the LISA Pathfinder test-mass charging for LISA
Cesarini, A.; Grimani, C.; Fabi, M. +2 more
Context. Cubic gold-platinum free-falling test masses (TMs) constitute the mirrors of future LISA and LISA-like interferometers for low-frequency gravitational wave detection in space. High-energy particles of Galactic and solar origin charge the TMs and thus induce spurious electrostatic and magnetic forces that limit the sensitivity of these int…
A Mass Model for the Lensing Cluster SDSS J1004+4112: Constraints from the Third Time Delay
Kochanek, C. S.; Muñoz, J. A.; Mediavilla, E. +1 more
We have built a new model for the lens system SDSS J1004+4112 including the recently measured time delay of the fourth quasar image. This time delay has a strong influence on the inner mass distribution of the lensing cluster (ρ ∝ r -α ) allowing us to determine $\alpha ={1.18}_{-0.03(-0.18)}^{+0.02(+0.11)}$ at the 68% (95%) confidence …
Relic galaxy analogues in TNG50 simulation: the formation pathways of surviving red nuggets in a cosmological simulation
Chies-Santos, Ana L.; Ferreira, Leonardo; De Rossi, María Emilia +4 more
Relic galaxies are massive compact quiescent galaxies that formed at high-redshift and remained almost unchanged since then. In this work, we search for analogues to relic galaxies in the TNG50 cosmological simulations to understand relic formation and test the ability of TNG50 to reproduce such rare objects. Using stellar mass, age, radius, quies…
Constraints on the structure and seasonal variations of Triton's atmosphere from the 5 October 2017 stellar occultation and previous observations
Forget, F.; Strobel, D. F.; Hueso, R. +234 more
Context. A stellar occultation by Neptune's main satellite, Triton, was observed on 5 October 2017 from Europe, North Africa, and the USA. We derived 90 light curves from this event, 42 of which yielded a central flash detection.
Aims: We aimed at constraining Triton's atmospheric structure and the seasonal variations of its atmospheric press…