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Birds of a Feather: Resolving Stellar Mass Assembly with JWST/NIRCam in a Pair of Kindred z ∼ 2 Dusty Star-forming Galaxies Lensed by the PLCK G165.7+67.0 Cluster
Grogin, Norman A.; Holwerda, Benne W.; Koekemoer, Anton M. +38 more
We present a new parametric lens model for the G165.7+67.0 galaxy cluster, which was discovered with Planck through its bright submillimeter flux, originating from a pair of extraordinary dusty star-forming galaxies (DSFGs) at z ≈ 2.2. Using JWST and interferometric mm/radio observations, we characterize the intrinsic physical properties of the DS…
Characterization of high-velocity stars in the S-PLUS internal fourth data release
Pereira, C. B.; Mendes de Oliveira, C.; Placco, V. M. +7 more
In general, the atypical high velocity of some stars in the Galaxy can only be explained by invoking acceleration mechanisms related to extreme astrophysical events in the Milky Way. Using astrometric data from Gaia and the photometric information in 12 filters of the S-PLUS, we performed a kinematic, dynamical, and chemical analysis of 64 stars w…
A magnetic reconnection model for the hot explosion with both ultraviolet and Hα wing emissions
Cheng, Guanchong; Ni, Lei; Chen, Yajie +1 more
Context. Ellerman bombs (EBs) with significant Hα wing emissions and ultraviolet bursts (UV bursts) with strong Si IV emissions are two kinds of small transient brightening events that occur in the low solar atmosphere. The statistical observational results indicate that about 20% of the UV bursts connect with EBs. While some promising models exis…
Swift, NuSTAR, and INTEGRAL observations of the symbiotic X-ray binary IGR J16194-2810
Ducci, L.; Romano, P.; Ferrigno, C. +1 more
We report on a simultaneous observational campaign with both Swift/XRT and NuSTAR targeting the symbiotic X-ray binary (SyXB) IGR J16194-2810. The main goal of the campaign was to investigate the possible presence of cyclotron scattering absorption features in the broad-band spectrum of the source, and help advance our understanding of the process…
Discovery of the first olivine-dominated A-type asteroid family
Galluccio, L.; Delbo, M.; Avdellidou, C. +1 more
The classical theory of differentiation states that due to the heat generated by the decay of radioactive elements, some asteroids form an iron core, an olivine-rich mantle, and a crust. The collisional breakup of these differentiated bodies is expected to lead to exposed mantle fragments, creating families of newly-formed asteroids. Among these n…
Sun-as-a-star Observations of Obscuration Dimmings Caused by Filament Eruptions
Veronig, Astrid M.; Dissauer, Karin; Tian, Hui +1 more
Filament eruptions often lead to coronal mass ejections (CMEs) on the Sun and are one of the most energetic eruptive phenomena in the atmospheres of other late-type stars. However, the detection of filament eruptions and CMEs on stars beyond the solar system is challenging. Here, we present six filament eruption cases on the Sun and show that fila…
Flux Contribution and Geometry of Charge Exchange Emission in the Starburst Galaxy M82
Foster, Adam R.; Smith, Randall K.; Okon, Hiromichi +1 more
Recent X-ray studies of starburst galaxies have found that charge exchange (CX) commonly occurs between outflowing hot plasma and cold gas, possibly from swept-up clouds. However, the total CX flux and the regions where CX occurs have been poorly understood. We present an analysis of XMM-Newton observations of M82, a prototype starburst galaxy, ai…
New ACV variables discovered in the Zwicky Transient Facility survey
Paunzen, E.; Prišegen, M.; Piecka, M. +8 more
Context. The manifestation of surface spots on magnetic chemically peculiar (mCP) stars is most commonly explained by the atomic diffusion theory, which requires a calm stellar atmosphere and only moderate rotation. While very successful and well described, this theory still needs to be revised and fine-tuned to the observations.
Aims: Our st…
Catalogue of dual-field interferometric binary calibrators
Lutz, D.; Förster Schreiber, N. M.; Genzel, R. +96 more
Context. Dual-field interferometric observations with VLTI/GRAVITY sometimes require the use of a binary calibrator. This is a binary star whose individual components remain unresolved by the interferometer, with a separation between 400 and 2000 mas for observations with the Unit Telescopes (UTs), or 1200-3000 mas for the Auxiliary Telescopes (AT…
Dynamical Phenomena in the Martian Atmosphere Through Mars Express Imaging
Sánchez-Lavega, A.; Tirsch, D.; Spiga, A. +5 more
This review describes the dynamic phenomena in the atmosphere of Mars that are visible in images taken in the visual range through cloud formation and dust lifting. We describe the properties of atmospheric features traced by aerosols covering a large range of spatial and temporal scales, including dynamical interpretations and modelling when avai…