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Simulating the Legacy Survey of Space and Time Stellar Content with TRILEGAL
Clarkson, William I.; Girardi, Léo; Nikutta, Robert +19 more
We describe a large simulation of the stars to be observed by the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). The simulation is based on the TRILEGAL code, which resorts to large databases of stellar evolutionary tracks, synthetic spectra, and pulsation models, added to simple prescriptions for the stellar density and star fo…
Snails across Scales: Local and Global Phase-mixing Structures as Probes of the Past and Future Milky Way
Hogg, David W.; Laporte, Chervin F. P.; Price-Whelan, Adrian M. +3 more
Signatures of vertical disequilibrium have been observed across the Milky Way's (MW's) disk. These signatures manifest locally as unmixed phase spirals in z-v z space ("snails-in-phase"), and globally as nonzero mean z and v z , wrapping around the disk into physical spirals in the x-y plane ("snails-in-space"). We explore…
A hot and luminous source at the site of the fast transient AT2018cow at 2-3 yr after its explosion
Sun, Ning-Chen; Crowther, Paul A.; Maund, Justyn R. +1 more
We report the discovery of a luminous late-time source at the position of the fast blue optical transient AT2018cow on images taken by the Hubble Space Telescope at 714 d and 1136 d after its explosion. This source is detected at both UV and optical wavelengths and has prominent Hα emission. It has a very stable brightness between the two epochs a…
Velocity structure of the 50 pc long NGC 6334 filamentary cloud. Hints of multiple compressions and their impact on the cloud properties
Arzoumanian, Doris; Inutsuka, Shu-ichiro; André, Philippe +8 more
Context. The interstellar medium is observed to be organized in filamentary structures, and in neutral (H I) and ionized (H II) bubbles. The expanding nature of these bubbles shapes the surrounding medium and possibly plays a role in the formation and evolution of the interstellar filaments. The impact of the expansion of these bubbles on the inte…
GaiaHub: A Method for Combining Data from the Gaia and Hubble Space Telescopes to Derive Improved Proper Motions for Faint Stars
Anderson, Jay; van der Marel, Roeland P.; Watkins, Laura L. +6 more
We present GAIAHUB, a publicly available tool that combines Gaia measurements with Hubble Space Telescope (HST) archival images to derive proper motions (PMs). It increases the scientific impact of both observatories beyond their individual capabilities. Gaia provides PMs across the whole sky, but the limited mirror size and time baseline restrict…
Multiply lensed star forming clumps in the A521-sys1 galaxy at redshift 1
Richard, Johan; Adamo, Angela; Combes, Françoise +5 more
We study the population of star-forming clumps in A521-sys1, a $z=1.04$ system gravitationally lensed by the foreground ($z=0.25$) cluster Abell 0521. The galaxy presents one complete counter-image with a mean magnification of $\rm \mu \sim 4$ and a wide arc containing two partial images of A521-sys1 with magnifications reaching $\mu > 20$, all…
Solar jets observed with the Interface Region Imaging Spectrograph (IRIS)
Schmieder, Brigitte; Joshi, Reetika; Chandra, Ramesh
Solar jets are impulsive, collimated plasma ejections that are triggered by magnetic reconnection. They are observed for many decades in various temperatures and wavelengths, therefore their kinematic characteristics, such as velocity and recurrence, have been extensively studied. Nevertheless, the high spatial resolution of the Interface Region I…
A Census of Stars and Disks in Corona Australis
Luhman, K. L.; Esplin, T. L.
We have performed a census of the young stellar populations near the Corona Australis molecular cloud using photometric and kinematic data from several sources, particularly Gaia EDR3, and spectroscopy of hundreds of candidate members. We have compiled a catalog of 393 members of Corona Australis, (39 at >M6), 293 (36) of which are spectroscopi…
Methanol Mapping in Cold Cores: Testing Model Predictions
Vasyunin, Anton; Caselli, Paola; Punanova, Anna +5 more
Chemical models predict that in cold cores gas-phase methanol is expected to be abundant at the outer edge of the CO depletion zone, where CO is actively adsorbed. CO adsorption correlates with volume density in cold cores, and, in nearby molecular clouds, catastrophic CO freeze-out happens at volume densities above 104 cm-3.…
The building up of observed stellar scaling relations of massive galaxies and the connection to black hole growth in the TNG50 simulation
Faber, S. M.; Huertas-Company, M.; Dekel, A. +7 more
We study how mock-observed stellar morphological and structural properties of massive galaxies are built up between $z$ = 0.5 and $z$ = 3 in the TNG50 cosmological simulation. We generate mock images with the properties of the CANDELS survey and derive Sersic parameters and optical rest-frame morphologies as usually done in the observations. Overa…