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Likelihood-free Cosmological Constraints with Artificial Neural Networks: An Application on Hubble Parameters and SNe Ia
Zhang, Tong-Jie; Wang, Yu-Chen; Xie, Yuan-Bo +3 more
The errors of cosmological data generated from complex processes, such as the observational Hubble parameter data (OHD) and the Type Ia supernova (SN Ia) data, cannot be accurately modeled by simple analytical probability distributions, e.g., a Gaussian distribution. To constrain cosmological parameters from these data, likelihood-free inference i…
Wave-Particle Interactions in the Earths Magnetosphere
Ma, Qianli; Thorne, Richard M.; Li, Wen +1 more
Bayesian analysis of Enceladus's plume data to assess methanogenesis
Affholder, Antonin; Guyot, François; Sauterey, Boris +2 more
Observations from NASA's Cassini spacecraft established that Saturn's moon Enceladus has an internal liquid ocean. Analysis of a plume of ocean material ejected into space suggests that alkaline hydrothermal vents are present on Enceladus's seafloor. On Earth, such deep-sea vents harbour microbial ecosystems rich in methanogenic archaea. Here we u…
A calibration of the Rossby number from asteroseismology
García, R. A.; Mathur, S.; Khalatyan, A. +4 more
Stellar activity and rotation are tightly related in a dynamo process. Our understanding of this mechanism is mainly limited by our capability of inferring the properties of stellar turbulent convection. In particular, the convective turnover time is a key ingredient through the estimation of the stellar Rossby number, which is the ratio of the ro…
Dynamical masses and mass-to-light ratios of resolved massive star clusters - II. Results for 26 star clusters in the Magellanic Clouds
Mateo, Mario; Reiter, Megan; Roederer, Ian U. +5 more
We present spectroscopy of individual stars in 26 Magellanic Cloud (MC) star clusters with the aim of estimating dynamical masses and V-band mass-to-light (M/LV) ratios over a wide range in age and metallicity. We obtained 3137 high-resolution stellar spectra with M2FS on the Magellan/Clay Telescope. Combined with 239 published spectros…
SERENA: Particle Instrument Suite for Determining the Sun-Mercury Interaction from BepiColombo
Kallio, E.; Schmidt, W.; Barabash, S. +118 more
The ESA-JAXA BepiColombo mission to Mercury will provide simultaneous measurements from two spacecraft, offering an unprecedented opportunity to investigate magnetospheric and exospheric particle dynamics at Mercury as well as their interactions with solar wind, solar radiation, and interplanetary dust. The particle instrument suite SERENA (Search…
The ALMA Survey of 70 µm Dark High-mass Clumps in Early Stages (ASHES). IV. Star Formation Signatures in G023.477
Jackson, James M.; Sanhueza, Patricio; Lu, Xing +15 more
With a mass of ~1000 M ⊙ and a surface density of ~0.5 g cm-2, G023.477+0.114, also known as IRDC 18310-4, is an infrared dark cloud (IRDC) that has the potential to form high-mass stars and has been recognized as a promising prestellar clump candidate. To characterize the early stages of high-mass star formation, we have obs…
Constraints on warm dark matter from UV luminosity functions of high-z galaxies with Bayesian model comparison
Rudakovskyi, Anton; Mesinger, Andrei; Savchenko, Denys +1 more
The number density of small dark matter (DM) haloes hosting faint high-redshift galaxies is sensitive to the DM free-streaming properties. However, constraining these DM properties is complicated by degeneracies with the uncertain baryonic physics governing star formation. In this work, we use a flexible astrophysical model and a Bayesian inferenc…
The ZTF Source Classification Project. I. Methods and Infrastructure
Kulkarni, S. R.; Duev, Dmitry A.; Riddle, Reed +22 more
The Zwicky Transient Facility (ZTF) has been observing the entire northern sky since the start of 2018 down to a magnitude of 20.5 (5σ for 30 s exposure) in the g, r, and i filters. Over the course of two years, ZTF has obtained light curves of more than a billion sources, each with 50-1000 epochs per light curve in g and r, and fewer in i. To be …
Mass segregation and sequential star formation in NGC 2264 revealed by Herschel
Cunningham, N.; Lumsden, S. L.; Schneider, N. +16 more
Context. The mass segregation of stellar clusters could be primordial rather than dynamical. Despite the abundance of studies of mass segregation for stellar clusters, those for stellar progenitors are still scarce, so the question concerning the origin and evolution of mass segregation is still open.
Aims: Our goal is to characterize the str…