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Origins of the Evil Eye: M64's Stellar Halo Reveals the Recent Accretion of an SMC-mass Satellite
Bell, Eric F.; Monachesi, Antonela; Bailin, Jeremy +9 more
M64, often called the "Evil Eye" galaxy, is unique among local galaxies. Beyond its dramatic, dusty nucleus, it also hosts an outer gas disk that counter-rotates relative to its stars. The mass of this outer disk is comparable to the gas content of the Small Magellanic Cloud (SMC), prompting the idea that it was likely accreted in a recent minor m…
The value-added catalogue of ASAS-SN eclipsing binaries - II. Properties of extra-physics systems
Kochanek, C. S.; Stanek, K. Z.; Thompson, Todd A. +6 more
Detached eclipsing binaries are the primary tool used to measure precise masses and radii of stars. In our previous paper estimating the parameters of more than 30 000 detached eclipsing binaries, we identified 766 eclipsing binaries with additional features in their All-Sky Automated Survey for Supernovae (ASAS-SN) and Transiting Exoplanet Survey…
Decoding the compositions of four bright r-process-enhanced stars
Beers, Timothy C.; Sivarani, Thirupathi; Allende Prieto, Carlos +3 more
There has been a concerted effort in recent years to identify the astrophysical sites of the r-process that can operate early in the galaxy. The discovery of many r-process-enhanced (RPE) stars (especially by the R-process Alliance collaboration) has significantly accelerated this effort. However, only limited data exist on the detailed elemental …
Radio galaxy zoo EMU: towards a semantic radio galaxy morphology taxonomy
Adams, Elizabeth A. K.; Norris, Ray P.; Hopkins, Andrew M. +20 more
We present a novel natural language processing (NLP) approach to deriving plain English descriptors for science cases otherwise restricted by obfuscating technical terminology. We address the limitations of common radio galaxy morphology classifications by applying this approach. We experimentally derive a set of semantic tags for the Radio Galaxy…
Dynamical Masses of 20 Asteroids Determined with Gaia DR3 Asteroid Observations
Fu, Yanning; Yuan, Ye; Chen, Jian +1 more
We combined the ground-based and Gaia Data Release 3 (DR3) asteroid observations to determine the masses of 20 asteroids with asteroid-asteroid close encounters. In order to take full advantage of the high-precision observations from Gaia, we use the Fisher information to select appropriate model parameters and the modified Encke's equation of mot…
Mass Function of a Young Cluster in a Low-metallicity Environment. Sh 2-209
Kobayashi, Naoto; Izumi, Natsuko; Saito, Masao +2 more
We present deep near-infrared (NIR) imaging of Sh 2-209 (S209), a low-metallicity ([O/H] = -0.5 dex) H II region in the Galaxy. From the NIR images, combined with astrometric data from Gaia EDR3, we estimate the distance to S209 to be 2.5 kpc. This is close enough to enable us to resolve cluster members clearly (≃1000 au separation) down to a mass…
A prominence eruption from the Sun to the Parker Solar Probe with multi-spacecraft observations
Susino, Roberto; Andretta, Vincenzo; Landini, Federico +10 more
In the early hours of 2021 April 25, the Solar Probe Cup on board Parker Solar Probe registered the passage of a solar wind structure characterized by a clear and constant He2+/H+ density ratio above 6% during three hours. The He2+ contribution remained present but fainting and intermittent within a twelve-hour window. Solar Orbiter and Parker Sol…
Investigating Pre-eruptive Magnetic Properties at the Footprints of Erupting Magnetic Flux Ropes
Qiu, Jiong; Wang, Yuming; Liu, Rui +4 more
It is well established that solar eruptions are powered by free magnetic energy stored in the current-carrying magnetic field in the corona. It has also been generally accepted that magnetic flux ropes (MFRs) are a critical component of many coronal mass ejections. What remains controversial is whether MFRs are present well before the eruption. Ou…
Stars, Gas, and Star Formation of Distant Post-starburst Galaxies
Maseda, Michael V.; D'Eugenio, Francesco; van der Wel, Arjen +5 more
We present a comprehensive multiwavelength study of five post-starburst galaxies with M * > 1011 M ⊙ at z ~ 0.7, examining their stars, gas, and current and past star formation activities. Using optical images from the Subaru Telescope and Hubble Space Telescope, we observe a high incidence of companion galaxies…
ALMA ACA study of the H2S/OCS ratio in low-mass protostars
Tabone, Benoît; Drozdovskaya, Maria N.; Tychoniec, Łukasz +1 more
Context. The identification of the main sulfur reservoir on its way from the diffuse interstellar medium to the cold dense star-forming cores and, ultimately, to protostars is a long-standing problem. Despite sulfur's astrochemical relevance, the abundance of S-bearing molecules in dense cores and regions around protostars is still insufficiently …