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Luminous Late-time Radio Emission from Supernovae Detected by the Karl G. Jansky Very Large Array Sky Survey (VLASS)
Paterson, Kerry; Margutti, Raffaella; Terreran, Giacomo +10 more
We present a population of 19 radio-luminous supernovae (SNe) with emission reaching L ν ~ 1026-1029 erg s-1 Hz-1 in the first epoch of the Very Large Array Sky Survey (VLASS) at 2-4 GHz. Our sample includes one long gamma-ray burst, SN 2017iuk/GRB 171205A, and 18 core-collapse SNe detected …
A Catalog of Interplanetary Coronal Mass Ejections Observed by Juno between 1 and 5.4 au
Lugaz, Noé; Winslow, Réka M.; Möstl, Christian +2 more
We use magnetic field measurements by the Juno spacecraft to catalog and investigate interplanetary coronal mass ejections (ICMEs) beyond 1 au. During its cruise phase, Juno spent about 5 yr in the solar wind between 2011 September and 2016 June, providing measurements of the interplanetary magnetic field (IMF) between 1 and 5.4 au. Juno therefore…
Internal rotation of Milky Way dwarf spheroidal satellites with Gaia Early Data Release 3
van der Marel, Roeland P.; Watkins, Laura L.; del Pino, Andrés +2 more
We present an analysis of the kinematics of 14 satellites of the Milky Way (MW). We use proper motions (PMs) from the Gaia Early Data Release 3 (EDR3) and line-of-sight velocities (vlos) available in the literature to derive the systemic 3D motion of these systems. For six of them, namely the Carina, Draco, Fornax, Sculptor, Sextans, an…
Revealing the formation histories of the first stars with the cosmic near-infrared background
Furlanetto, Steven R.; Sun, Guochao; Mirocha, Jordan +1 more
The cosmic near-infrared background (NIRB) offers a powerful integral probe of radiative processes at different cosmic epochs, including the pre-reionization era when metal-free, Population III (Pop III) stars first formed. While the radiation from metal-enriched, Population II (Pop II) stars likely dominates the contribution to the observed NIRB …
Identification of pre-stellar cores in high-mass star forming clumps via H2D+ observations with ALMA
Wyrowski, F.; Caselli, P.; Giannetti, A. +5 more
Context. The different theoretical models concerning the formation of high-mass stars make distinct predictions regarding their progenitors, which are the high-mass pre-stellar cores. However, no conclusive observation of such objects has been made to date.
Aims: We aim to study the very early stages of high-mass star formation in two infrare…
Eclipsing the X-Ray Emitting Region in the Active Galaxy NGC 6814
Miller, Jon M.; Gallo, Luigi C.; Gonzalez, Adam G.
We report the detection of a rapid occultation event in the nearby Seyfert galaxy NGC 6814, simultaneously captured in a transient light curve and spectral variability. The intensity and hardness ratio curves capture distinct ingress and egress periods that are symmetric in duration. Independent of the selected continuum model, the changes can be …
The properties of dwarf spheroidal galaxies in the Cen A group. Stellar populations, internal dynamics, and a heart-shaped Hα ring
Coccato, Lodovico; Fahrion, Katja; Müller, Oliver +7 more
Dwarf spheroidal galaxies (dSphs) have been extensively investigated in the Local Group, but their low luminosity and surface brightness make similar work in more distant galaxy groups challenging. Modern instrumentation unlocks the possibility of scrutinizing these faint systems in other environments, expanding the parameter space of group proper…
ALMA 870 µm continuum observations of HD 100546. Evidence of a giant planet on a wide orbit
Lodato, G.; Fedele, D.; Maud, L. +1 more
This paper reports on a new analysis of archival ALMA 870 µm dust continuum observations. Along with the previously observed bright inner ring (r ~ 20-40 au), two addition substructures are evident in the new continuum image: a wide dust gap, r ~ 40-150 au, and a faint outer ring ranging from r ~ 150 au to r ~ 250 au and whose presence was f…
Enhanced Localization of Transients Based on a Novel Cross-correlation Method
Huang, Y.; Zhang, S. N.; Zhao, Y. +12 more
Locating gamma-ray transients including gamma-ray bursts (GRBs) and soft gamma repeater (SGR) bursts is of great importance in multi-messenger and multi-wavelength astronomy, such as guiding optical and radio follow-up observations and evaluating the association of a GRB with a gravitational wave or an SGR with a galaxy or fast radio burst (FRB). …
Fundamental X-ray corona parameters of Swift/BAT AGN
Mushotzky, Richard; Hinkle, Jason T.
While X-ray emission from active galactic nuclei (AGN) is common, the detailed physics behind this emission is not well understood. This is in part because high quality broad-band spectra are required to precisely derive fundamental parameters of X-ray emission, such as the photon index, folding energy, and reflection coefficient. Here, we present…