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JADES: Spectroscopic Confirmation and Proper Motion for a T-Dwarf at 2 kpc
Carniani, Stefano; D'Eugenio, Francesco; Bunker, Andrew J. +15 more
Large area observations of extragalactic deep fields with the James Webb Space Telescope (JWST) have provided a wealth of candidate low-mass L- and T-class brown dwarfs. The existence of these sources, which are at derived distances of hundreds of parsecs to several kiloparsecs from the Sun, has strong implications for the low-mass end of the stel…
Multiwavelength Observations of Sgr A*. II. 2019 July 21 and 26
Smith, Howard A.; Fazio, Giovanni G.; Bushouse, Howard +6 more
We report on the final two days of a multiwavelength campaign of Sgr A* observing in the radio, submillimeter, infrared (IR), and X-ray bands in 2019 July. Sgr A* was remarkably active, showing multiple flaring events across the electromagnetic spectrum. We detect a transient ∼35 minute periodicity feature in Spitzer light curves on 2019 July 21. …
A Morphokinematic Study of the Enigmatic Emission Nebula NGC 6164/5 Surrounding the Magnetic O-type Star HD 148937
Lim, Beomdu; Nazé, Yaël; Chang, Seok-Jun +1 more
HD 148937 is a peculiar massive star (Of?p) with a strong magnetic field (1 kG). The hourglass-shaped emission nebula NGC 6164/5 surrounds this star. This nebula is presumed to originate from episodic mass-loss events of the central O-type star, but the detailed formation mechanism is not yet well understood. Grasping its three-dimensional structu…
Non-thermal electrons in an eruptive solar event: Magnetic structure, confinement, and escape into the heliosphere
Klein, Karl-Ludwig; Kollhoff, Alexander; Salas Matamoros, Carolina +1 more
Context. Filament eruptions and coronal mass ejections (CMEs) reveal large-scale instabilities of magnetic structures in the solar corona. Some of them are accompanied by radio emission, which at decimetric and longer wavelengths is a signature of electron acceleration that may be different from the acceleration in impulsive flares. The radio emis…
Testing Cluster Membership of Planetary Nebulae with High-precision Proper Motions. I. HST Observations of JaFu 1 Near the Globular Cluster Palomar 6
Bond, Howard E.; Sahu, Kailash C.; Bellini, Andrea
If a planetary nebula (PN) is shown to be a member of a star cluster, we obtain important new constraints on the mass and chemical composition of the PN's progenitor star, which cannot be determined for PNe in the field. Cluster membership can be tested by requiring the projected separation between the PN and cluster to be within the tidal radius …
Discovery of Globular Cluster Candidates in the Dwarf Irregular Galaxy IC 2574 Using HST/ACS Imaging
Forbes, Duncan A.; Read, Justin I.; Collins, Michelle L. M. +1 more
We report the discovery of 23 globular cluster (GC) candidates around the relatively isolated dwarf galaxy IC 2574 within the Messier 81 (M81) group, at a distance of 3.86 Mpc. We use observations from the HST Advanced Camera for Surveys (ACS) to analyse the imaging in the F814W and F555W broad-band filters. Our GC candidates have luminosities ran…
The stellar occultation by (319) Leona on 2023 September 13 in preparation for the occultation of Betelgeuse
Gutiérrez, P. J.; Luque-Escamilla, P. L.; Alvarez-Candal, A. +43 more
On 2023 December 12, the star α Orionis will be occulted by asteroid (319) Leona. This represents an extraordinary and unique opportunity to analyse the brightness distribution of Betelgeuse's photosphere with extreme angular resolution by studying light curves from different points on Earth and at different wavelengths. Here we present observatio…
Far-ultraviolet to Far-infrared Spectral Energy Distribution Modeling of the Star Formation History across M31
Hopkins, Andrew M.; Leahy, Denis A.; Hansen, Jakob
Our neighboring galaxy M31 has been recently surveyed at the far- and near-ultraviolet (FUV and NUV) with the UVIT telescope on AstroSat, which provides unprecedented sensitivity to young stellar populations. Here the UVIT data are supplemented with optical data, near-infrared (IR) data (Spitzer), and mid- and far-IR data (Herschel). The observati…
Comparison of magnetic data products from Solar Orbiter SO/PHI-FDT and SDO/HMI
Woch, J.; Solanki, S. K.; Schou, J. +34 more
Context. The Polarimetric and Helioseismic Imager (SO/PHI), on board the Solar Orbiter mission, is the first photospheric magnetograph and tachograph to observe the Sun from outside the Sun-Earth line. The Full Disc Telescope (FDT) of SO/PHI, images the whole solar disk with a spatial resolution that varies with the distance between the Sun and th…
A Complete 16 µm Selected Galaxy Sample at z ∼ 1. II. Morphological Analysis
Cheng, Cheng; Huang, Jia-Sheng; Dai, Y. Sophia +2 more
We present a morphological analysis of the 16 µm flux-density-limited galaxy sample at 0.8 < z < 1.3 from Huang et al. (2021). At the targeted redshift, the 16 µm emission corresponds to the polycyclic aromatic hydrocarbon feature from intense star formation, or dust heated by active galactic nuclei (AGN). Our sample of 479 galax…