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High-mass star formation across the Large Magellanic Cloud. I. Chemical properties and hot molecular cores observed with ALMA at 1.2 mm
Fuller, Gary A.; Sánchez-Monge, Álvaro; Schilke, Peter +4 more
Context. The formation of massive stars passes through a so-called hot molecular core phase, where the temperature of molecular gas and dust rises to above 100 K within a size scale of approximately 0.1 pc. The hot molecular cores are rich in chemical compounds found in the gas phase, which are a great probe of ongoing star formation.
Aims: T…
Astrometry as a Tool for Discovering and Weighing Faint Companions to Nearby Stars
Brandt, Timothy D.
This tutorial covers the use of absolute astrometry, in particular from the combination of the Hipparcos and Gaia missions, to identify faint companions to nearby stars and to measure the masses and orbits of those companions. Absolute astrometry has been used with increasing success to discover new planets and brown dwarfs and to measure masses a…
HybPSF: Hybrid Point-spread Function Reconstruction for the Observed JWST NIRCam Image
Cheng, Cheng; Cui, Qifan; Nie, Lin +7 more
The James Webb Space Telescope (JWST) marks a new era of astronomical observation and discovery, providing unrivaled precision in various measurements, including photometry, morphology, and shear measurement. Accurate point-spread function (PSF) models are essential for many of these measurements. In this paper, we introduce HybPSF, a hybrid PSF c…
Studying the Properties of Spacetime with an Improved Dynamical Model of the Inner Solar System
Pavlov, Dmitry; Dolgakov, Ivan
Physical properties of the Sun (orientation of rotation axis, oblateness coefficient
New method for estimating molecular cloud distances based on Gaia, 2MASS, and the TRILEGAL galaxy model
Chen, Zhiwei; Feng, Haoran; Jiang, Zhibo +2 more
We propose a new method for estimating the distances of molecular clouds traced by CO line emission. Stars from 2MASS and Gaia EDR3 are selected as on-cloud stars when they are projected on a cloud. The background on-cloud stars have redder colors on average than the foreground stars. Instead of searching for stars projected away from the cloud, w…
PEARLS: Discovery of Point-source Features within Galaxies in the North Ecliptic Pole Time Domain Field
Grogin, Norman A.; Hathi, Nimish P.; Holwerda, Benne W. +36 more
The first public 0.9–4.4 µm NIRCam images of the North Ecliptic Pole Time Domain Field uncovered galaxies displaying point-source features in their cores as seen in the longer-wavelength filters. We visually identified a sample of 66 galaxies (∼1 galaxy arcmin–2) with pointlike cores and have modeled their two-dimensional light pr…
Exploring the Origin of Cold Gas and Star Formation in a Rare Population of Strongly Bulge-dominated Early-type Galaxies
Lin, Zesen; Kong, Xu; Zhang, Chuan-Peng +7 more
We analyze the properties of a rare population, the strongly bulge-dominated early-type galaxies (sBDEs) with significant H I gas, using the databases from the FAST All Sky H I survey (FASHI) and the Arecibo Legacy Fast ALFA (ALFALFA) survey. We select the sBDEs from the Sloan Digital Sky Survey and crossmatch with the FASHI-ALFALFA combined H I s…
Study of the Carbon Star T Draconis
Tatarnikov, A. M.; Shenavrin, V. I.; Zheltoukhov, S. G. +2 more
We present the results of the infrared photometric observations in the $JHKLM$ bands and infrared spectroscopic observations in the range 1-2.5 $µ$m for the carbon Mira star T Dra performed from 2019 to 2023. An analysis of the photometric observations shows the presence of both pulsational brightness fluctuations with an amplitude falling f…
Boost recall in quasi-stellar object selection from highly imbalanced photometric datasets. The reverse selection method
Grazian, Andrea; Boutsia, Konstantina; Cupani, Guido +9 more
Context. The identification of bright quasi-stellar objects (QSOs) is of fundamental importance to probe the intergalactic medium and address open questions in cosmology. Several approaches have been adopted to find such sources in the currently available photometric surveys, including machine learning methods. However, the rarity of bright QSOs a…
Global Environmental Constraints on Magnetic Reconnection at the Magnetopause From In Situ Measurements
Lavraud, B.; Génot, V.; Jeandet, A. +5 more
Progress in locating the X-line on the magnetopause beyond the atypical due south interplanetary magnetic field (IMF) condition is hampered by the fact that the global plasma and field spatial distributions constraining where reconnection could develop on the magnetopause are poorly known. This work presents global maps of the magnetic shear, curr…