Results 31 to 40 of about 3,493 (285)
The Astrophysical Journal, 2023 G10.21-0.31 is a 70 μ m dark high-mass starless core ( M > 300 M _⊙ within r < 0.15 pc) identified in the Spitzer, Herschel, and APEX continuum surveys, and is believed to harbor the initial stages of high-mass star formation.
Wenyu Jiao +5 more
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THE DYNAMICAL STATE OF FILAMENTARY INFRARED DARK CLOUDS [PDF]
The Astrophysical Journal, 2011 The dense, cold gas of Infrared Dark Clouds (IRDCs) is thought to be representative of the initial conditions of massive star and star cluster formation. We analyze 13CO(J=1-0) line emission data from the Galactic Ring Survey of Jackson et al. for two filamentary IRDCs, comparing the mass surface densities derived from 13CO, Sigma_13CO, with those ...
Hernandez, Audra K., Tan, Jonathan C.
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The Astrophysical Journal, 2023 Starless cores represent the initial stage of evolution toward (proto)star formation, and a subset of them, known as prestellar cores, with high density (∼ 10 ^6 cm ^−3 or higher) and being centrally concentrated are expected to be embryos of (proto ...
Dipen Sahu +25 more
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15N fractionation in infrared-dark cloud cores [PDF]
Astronomy & Astrophysics, 2017 Nitrogen is one of the most abundant elements in the Universe and its 14N/15N isotopic ratio has the potential to provide information about the initial environment in which our Sun formed. Recent findings suggest that the Solar System may have formed in a massive cluster since the presence of short-lived radioisotopes in meteorites can only be ...
Zeng, S. +8 more
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Communications Chemistry, 2022 The detection of glycine in comets is suggestive of a cosmic origin for amino acids on Earth, but the formation of glycine in interstellar media remains poorly understood.
Prasad Ramesh Joshi, Yuan-Pern Lee
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The modelling of infrared dark cloud cores [PDF]
Astronomy & Astrophysics, 2005 This paper presents results from modelling 450 mu m and 850 mu m continuum and HCO+ line observations of three distinct cores of an infrared dark cloud (IRDC) directed toward the W51 GMC. In the sub-mm continuum these cores appear as bright, isolated emission features.
Ormel, C. W. +3 more
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Multiscale Dynamical Scenario of High-mass Star Formation in an IRDC Filament G34
The Astrophysical Journal, 2023 There is growing evidence that high-mass star formation (HMSF) is a multiscale, dynamical process in molecular clouds, where filaments transport gas material between larger and smaller scales.
Sirong Pan, Hong-Li Liu, Sheng-Li Qin
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Binary Formation in a 100 μm Dark Massive Core
The Astrophysical Journal, 2023 We report high-resolution ALMA observations toward a massive protostellar core C1-Sa (∼30 M _⊙ ) in the Dragon infrared dark cloud. At the resolution of 140 au, the core fragments into two kernels (C1-Sa1 and C1-Sa2) with a projected separation of ∼1400 ...
Shuo Kong +6 more
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NIKA2 observations around LBV stars Emission from stars and circumstellar material [PDF]
EPJ Web of Conferences, 2020 Luminous Blue Variable (LBV) stars are evolved massive objects, previous to core-collapse supernova. LBVs are characterized by photometric and spectroscopic variability, produced by strong and dense winds, mass-loss events and very intense UV radiation ...
Ricardo Rizzo J. +2 more
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Molecular line observations of infrared dark clouds. II. Physical conditions [PDF]
, 2009 Using a source selection biased toward high-mass star-forming regions, we used a large velocity gradient code to calculate the H2 densities and CS column densities for a sample of Midcourse Space Experiment 8 mum infrared dark cores.
David Gibson +9 more
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