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Optical/UV emission in the Tidal Disruption Event ASASSN-14li: implications of disc modelling
Wen, Sixiang; Jonker, Peter G.; Stone, Nicholas C. +2 more
We predict late-time optical/UV emission from tidal disruption events (TDEs) from our slim accretion disc model (Wen et al. 2020) and explore the impact of the black hole mass M•, black hole spin a•, and accretion disc size. We use these synthetic spectra to successfully fit the multiband Swift observations of ASASSN-14li at …
Prospects for future studies using deep imaging: analysis of individual Galactic cirrus filaments
Gontcharov, George A.; Mosenkov, Aleksandr V.; Román, Javier +6 more
The presence of Galactic cirrus is an obstacle for studying both faint objects in our Galaxy and low surface brightness extragalactic structures. With the aim of studying individual cirrus filaments in Sloan Digital Sky Survey (SDSS) Stripe 82 data, we develop techniques based on machine learning and neural networks that allow one to isolate filam…
Wide-binary Stars Formed in the Turbulent Interstellar Medium
Hwang, Hsiang-Chih; Xu, Siyao; Hamilton, Chris +1 more
The ubiquitous interstellar turbulence regulates star formation and the scaling relations between the initial velocity differences and the initial separations of stars. We propose that the formation of wide binaries with initial separations r in the range ~103 au ≲ r ≲ 105 au is a natural consequence of star formation in the …
Probing the variations in the timing of the Sun's polar magnetic field reversals through observations and surface flux transport simulations
Karak, Bidya Binay; Kumar, Pawan; Golubeva, Elena M. +2 more
The polar field reversal is a crucial process in the cyclic evolution of the large-scale magnetic field of the Sun. Various important characteristics of a solar cycle, such as its duration and strength, and also the cycle predictability, are determined by the polar field reversal time. While the regular measurements of solar magnetic field have be…
The large molecular gas fraction of post-starburst galaxies at z > 1
Zanella, A.; Valentino, F.; Magdis, G. +3 more
Post-starburst galaxies are sources that had the last major episode of star formation about 1 Gyr before the epoch of the observations and are on their way to quiescence. It is important to study such galaxies at redshift z > 1, during their main quenching phase, and estimate their molecular gas content to constrain the processes responsible fo…
Panning for gold, but finding helium: Discovery of the ultra-stripped supernova SN 2019wxt from gravitational-wave follow-up observations
Beswick, R.; Covino, S.; D'Avanzo, P. +101 more
We present the results from multi-wavelength observations of a transient discovered during an intensive follow-up campaign of S191213g, a gravitational wave (GW) event reported by the LIGO-Virgo Collaboration as a possible binary neutron star merger in a low latency search. This search yielded SN 2019wxt, a young transient in a galaxy whose sky po…
Kinetic Alfven wave (KAW) eigenmode in magnetosphere magnetic reconnection
Wang, Chi; Dai, Lei
One prominent signature of collisionless magnetic reconnection in the magnetosphere is the Hall effect. In the ion-scale region of reconnection, ions cannot follow the magnetic field line whereas electrons are still magnetized. The difference in the motions of electrons and ions leads to charge separation, the resulting transverse Hall electric fi…
Stellar Properties for a Comprehensive Collection of Star-forming Regions in the SDSS APOGEE-2 Survey
Bizyaev, Dmitry; Pan, Kaike; Stassun, Keivan G. +25 more
The Sloan Digital Sky Survey IV APOGEE-2 primary science goal was to observe red giant stars throughout the Galaxy to study its dynamics, morphology, and chemical evolution. The APOGEE instrument, a high-resolution 300-fiber H-band (1.55-1.71 µm) spectrograph, is also ideal to study other stellar populations in the Galaxy, among which are a …
Vertical Structure of the Milky Way Disk with Gaia DR3
Vieira, Katherine; Carraro, Giovanni; Korchagin, Vladimir +1 more
Using a complete sample of about 330,000 dwarf stars, well measured by Gaia DR3, limited to the galactic north and south solid angles |b|<75° and up to a vertical distance of 2 kpc, we analyze the vertical structure of the Milky Way stellar disks, based on projected tangential velocities. From selected subsamples dominated by their correspondin…
Redshift Evolution of the Feedback-Cooling Equilibrium in the Core of 48 SPT Galaxy Clusters: A Joint Chandra-SPT-ATCA Analysis
Filipović, M. D.; Hlavacek-Larrondo, J.; Bleem, L. E. +17 more
We analyze the cooling and feedback properties of 48 galaxy clusters at redshifts 0.4 < z < 1.3 selected from the South Pole Telescope (SPT) catalogs to evolve like the progenitors of massive and well-studied systems at z ~ 0. We estimate the radio power at the brightest cluster galaxy (BCG) location of each cluster from an analysis of Austr…