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A Luminous X-Ray Transient in SDSS J143359.16+400636.0: A Likely Tidal Disruption Event
Riddle, Reed; Stern, Daniel; Gezari, Suvi +9 more
We present the discovery of a luminous X-ray transient, serendipitously detected by Swift's X-ray Telescope on 2020 February 5, located in the nucleus of the galaxy SDSS J143359.16+400636.0 at z = 0.099 (luminosity distance DL = 456 Mpc). The transient was observed to reach a peak luminosity of ∼1044 erg s-1 in the…
Magnetic Field Reconstruction for a Realistic Multi-Point, Multi-Scale Spacecraft Observatory
Klein, K. G.; Verscharen, D.; Roberts, O. W. +3 more
Future in situ space plasma investigations will likely involve spatially distributed observatories comprised of multiple spacecraft, beyond the four and five spacecraft configurations currently in operation. Inferring the magnetic field structure across the observatory, and not simply at the observation points, is a necessary step towards characte…
Spectrophotometric properties of materials observed by Pancam on the Mars Exploration Rovers: 4. Final mission observations
Johnson, Jeffrey R.; Grundy, William M.; Lemmon, Mark T. +4 more
The last sets of Panoramic Camera (Pancam) visible/near-infrared (432-1009 nm) multispectral observations made under varying viewing and illumination geometries by the Mars Exploration Rovers Spirit and Opportunity were examined using radiative transfer models to study the surface scattering and microphysical nature of rock and soil units at both …
FORCAST Imaging of Two Small Nearby Clusters: The Coronet and B 59
Vacca, William D.; Reipurth, Bo; Sandell, Göran +1 more
We present mid-infrared imaging of two young clusters, the Coronet in the CrA cloud core and B 59 in the Pipe Nebula, using the FORCAST camera on the Stratospheric Observatory for Infrared Astronomy. We also analyze Herschel Space Observatory4 PACS and SPIRE images of the associated clouds. The two clusters are at similar, and very clos…
The relation between Lyα absorbers and local galaxy filaments
Richter, P.; Wendt, M.; Bouma, S. J. D.
Context. The intergalactic medium (IGM) is believed to contain the majority of baryons in the universe and to trace the same dark matter structure as galaxies, forming filaments and sheets. Lyα absorbers, which sample the neutral component of the IGM, have been extensively studied at low and high redshift, but the exact relation between Lyα absorp…
Linking ice and gas in the λ Orionis Barnard 35A cloud
Pontoppidan, K. M.; Rocha, W. R. M.; Bjerkeli, P. +5 more
Context. Dust grains play an important role in the synthesis of molecules in the interstellar medium, from the simplest species, such as H2, to complex organic molecules. How some of these solid-state molecules are converted into gas-phase species is still a matter of debate.
Aims: Our aim is to directly compare ice and gas abundan…
Using heritability of stellar chemistry to reveal the history of the Milky Way
Jofré, Paula; de Brito Silva, Danielle; Das, Payel +3 more
Since chemical abundances are inherited between generations of stars, we use them to trace the evolutionary history of our Galaxy. We present a robust methodology for creating a phylogenetic tree, a biological tool used for centuries to study heritability. Combining our phylogeny with information on stellar ages and dynamical properties, we recons…
Improved Atomic Transition Probabilities for UV and Optical Lines of Hf II and Determination of the Hf Abundance in Two Metal-poor Stars
Roederer, I. U.; Lawler, J. E.; Den Hartog, E. A.
We report new branching fraction measurements for 199 UV and optical transitions of Hf II. These transitions range in wavelength (wavenumber) from 2068 to 6584 Å (48,322-15,183 cm-1) and originate in 17 odd-parity upper levels ranging in energy from 38,578 to 53,227 cm-1. The branching fractions are combined with radiative li…
New-generation dust emission templates for star-forming galaxies
Boquien, Médéric; Salim, Samir
Context. The infrared (IR) emission of dust heated by stars provides critical information for galaxy evolution studies. Unfortunately, observations are often limited to the mid-IR, making templates a necessity. Previously published templates were based on small samples of luminous galaxies, which are not necessarily representative of normal star-f…
An updated distance to the Cygnus Loop based on Gaia Early DR3
Blair, William P.; Raymond, John C.; Fesen, Robert A. +2 more
We present a revised distance to the Cygnus Loop supernova remnant of 725 ± 15 pc based on Gaia Early Data Release 3 parallax measurements (EDR3) for several stars previously found to be located either inside or behind the supernova based on the presence of high-velocity absorption lines in their spectra. This revised distance estimate and error m…