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Coevolution of Giant Molecular Clouds, Filaments, and Clumps as a Function of the Dense Gas Mass Fraction
Li, Dalei; Tang, Xindi; Zhou, Jianjun +12 more
We investigate the evolutionary dynamics with archival continuum and line data of 27 giant molecular clouds (GMCs) in the Milky Way, focusing on their influence on star formation. Examining the dense gas mass fraction (DGMF) among the GMCs, we categorize them into low-DGMF (DGMF < 20%), medium-DGMF (20% < DGMF < 60%), and high-DGMF (60% &…
IS⊙IS Solar γ-Ray Measurements: Initial Observations and Calibrations
Mitchell, D. G.; McComas, D. J.; Mitchell, J. G. +13 more
High-energy neutral solar radiation in the form of γ-rays and neutrons is produced as secondary products in solar flares. The characteristics of this emission can provide key information regarding the energization of charged particles, particularly when primary particles remain trapped in the corona. The Integrated Science Investigation of the Sun…
A Multibranch Deep Neural Network for the Superresolution of Solar Magnetograms
Xu, Long; Zhao, Dong; Dou, Fengping +1 more
The existing superresolution (SR) models for solar magnetograms are mostly borrowed from the SR models for natural images. They are less effective for processing solar magnetograms with a very large dynamic range and very rich image features. In this paper, a multibranch superresolution (MBSR) model is specially designed for solar magnetograms. Fi…
The first light curve analysis of twin binary system V1175 Cas using ground-based and TESS data
Alan, Neslihan
Eclipsing binary systems hold a central position within astrophysics in that the fundamental parameters of stars can be determined by direct observations. The simultaneous analyses of high-quality space observations, combined with ground-based photometric data, have allowed more sensitive detection of fundamental stellar parameters by multicolor p…
Gaia23ckh: Symbiotic outburst of the assumed Mira variable V390 Sco
Skowron, Jan; Charbonnel, Stéphane; Garde, Olivier +5 more
The poorly studied variable star V390 Sco, previously classified as a Mira pulsator, was detected in a brightening event by the ESA Gaia satellite in September 2023. This work presents an analysis of available archival multifrequency photometric data of this target, along with our spectroscopic observations. Our findings lead to the conclusion tha…
MIRI MRS Observations of Beta Pictoris. II. The Spectroscopic Case for a Recent Giant Collision
Law, David R.; Chen, Christine H.; Hines, Dean C. +17 more
Modeling observations of the archetypal debris disk around β Pic, obtained in 2023 January with the MIRI Medium Resolution Spectrograph on board JWST, reveals significant differences compared with that obtained with the Infrared Spectrograph on board Spitzer. The bright 5–15 µm continuum excess modeled using a ∼600 K black body has disappear…
Multi-scale CLEAN for Fourier-based hard x-ray solar imaging
Volpara, Anna; Piana, Michele; Maria Massone, Anna +1 more
Multi-scale deconvolution is an ill-posed inverse problem in imaging, with applications ranging from microscopy, through medical imaging, to astronomical remote sensing. In the case of high-energy space telescopes, multi-scale deconvolution algorithms need to account for the peculiar property of native measurements, which are sparse samples of the…
Unravelling the nuclear dust morphology of NGC 1365: a two-phase polar-RAT model for the ultraviolet to infrared spectral energy distribution
Shalima, P.; Swain, Subhashree; Latha, K. V. P.
We present a 3D radiative transfer model for the spectral energy distribution (SED) of NGC 1365, which is a 'changing look' Seyfert 1.8 type active galactic nucleus (AGN). The SED from the ultraviolet (UV) to the infrared (IR) is constructed using archival data from the Ultra-Violet Imaging Telescope (UVIT) onboard AstroSat, along with IR data fro…
Disk Turbulence and Star Formation Regulation in High-z Main-sequence Analog Galaxies
Glazebrook, Karl; Lenkić, Laura; Bolatto, Alberto D. +7 more
The gas-phase velocity dispersions in disk galaxies, which trace turbulence in the interstellar medium, are observed to increase with lookback time. However, the mechanisms that set this rise in turbulence are observationally poorly constrained. To address this, we combine kiloparsec-scale Atacama Large Millimeter/submillimeter Array observations …
Prediction of Astrometric and Timing Microlensing Events with Pulsars by ATNF Catalog and Gaia DR3
Xie, Yi; Lu, Xu
Determining the mass of neutron stars is crucial for understanding their formation, evolution, and interior structure. Currently, only a few dozen neutron stars have had their masses measured, and most of them belong to binary systems. However, there are a huge number of isolated neutron stars with unknown masses. Microlensing events with neutron …