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The Large Array Survey Telescope-System Overview and Performances
Gal-Yam, A.; Kowalski, M.; Sadeh, I. +38 more
The Large Array Survey Telescope (LAST) is a wide-field visible-light telescope array designed to explore the variable and transient sky with a high cadence. LAST will be composed of 48, 28 cm f/2.2 telescopes (32 already installed) equipped with full-frame backside-illuminated cooled CMOS detectors. Each telescope provides a field of view (FoV) o…
Direct images and spectroscopy of a giant protoplanet driving spiral arms in MWC 758.
Dong, Ruobing; Wagner, Kevin; Stone, Jordan +23 more
Understanding the driving forces behind spiral arms in protoplanetary disks remains a challenge due to the faintness of young giant planets. MWC 758 hosts such a protoplanetary disk with a two-armed spiral pattern that is suggested to be driven by an external giant planet. We present observations in the thermal infrared that are uniquely sensitive…
Machine learning in solar physics
Cheung, Mark C. M.; Asensio Ramos, Andrés; Chifu, Iulia +1 more
The application of machine learning in solar physics has the potential to greatly enhance our understanding of the complex processes that take place in the atmosphere of the Sun. By using techniques such as deep learning, we are now in the position to analyze large amounts of data from solar observations and identify patterns and trends that may n…
X-Ray Polarization Observations of BL Lacertae
Wu, Kinwah; Masiero, Joseph R.; Tinyanont, Samaporn +144 more
Blazars are a class of jet-dominated active galactic nuclei with a typical double-humped spectral energy distribution. It is of common consensus that the synchrotron emission is responsible for the low frequency peak, while the origin of the high frequency hump is still debated. The analysis of X-rays and their polarization can provide a valuable …
Mass Models of the Milky Way and Estimation of Its Mass from the Gaia DR3 Data Set
Capuzzo-Dolcetta, Roberto; Sylos Labini, Francesco; Chrobáková, Žofia +1 more
We use data from the Gaia DR3 data set to estimate the mass of the Milky Way (MW) by analyzing the rotation curve in the range of distances 5 to 28 kpc. We consider three mass models: The first model adds a spherical dark matter (DM) halo, following the Navarro-Frenk-White (NFW) profile, to the known stellar components. The second model assumes th…
Early Insights for Atmospheric Retrievals of Exoplanets Using JWST Transit Spectroscopy
Madhusudhan, Nikku; Constantinou, Savvas; Gandhi, Siddharth
We have entered the era of the James Webb Space Telescope (JWST). We use the first JWST transmission spectrum of the hot Saturn-mass exoplanet, WASP-39 b, obtained with the NIRSpec instrument in the 3-5 µm range to investigate (a) what atmospheric constraints are possible with JWST-quality data in this spectral range, (b) requirements for at…
The connection between the escape of ionizing radiation and galaxy properties at z ∼ 3 in the Keck Lyman continuum spectroscopic survey
Steidel, Charles C.; Reddy, Naveen A.; Shapley, Alice +4 more
The connection between the escape fraction of ionizing radiation (fesc) and the properties of galaxies, such as stellar mass ($\rm M_{\rm *}$), age, star-formation rate (SFR), and dust content, are key inputs for reionization models, but many of these relationships remain untested at high redshift. We present an analysis of a sample of …
Bipolar outflows out to 10 kpc for massive galaxies at redshift z ≈ 1
Bacon, Roland; Blaizot, Jérémy; Boogaard, Leindert A. +15 more
Galactic outflows are believed to play a critical role in the evolution of galaxies by regulating their mass build-up and star formation1. Theoretical models assume bipolar shapes for the outflows that extend well into the circumgalactic medium (CGM), up to tens of kiloparsecs (kpc) perpendicular to the galaxies. They have been directly…
A wide-field view on multiple stellar populations in 28 Milky Way globular clusters
Cabrera-Ziri, I.; Pancino, E.; Hilker, M. +2 more
The majority of Galactic globular clusters (GCs) contain multiple stellar populations displaying specific chemical abundance variations. In particular, GCs generally contain a 'primordial' population with abundances similar to field stars, along with an 'enriched' population exhibiting light element anomalies. In this paper, we present a homogeneo…
Abell 1201: detection of an ultramassive black hole in a strong gravitational lens
Edge, Alastair C.; Lucey, John R.; Amvrosiadis, Aristeidis +9 more
Supermassive black holes (SMBHs) are a key catalyst of galaxy formation and evolution, leading to an observed correlation between SMBH mass MBH and host galaxy velocity dispersion σe. Outside the local Universe, measurements of MBH are usually only possible for SMBHs in an active state: limiting sample size and int…