Clustered Formation of Massive Stars within an Ionized Rotating Disk
The Astrophysical Journal Letters, 2022 We present Atacama Large Millimeter/submillimeter Array observations with a 800 au resolution and radiative-transfer modeling of the inner part ( r ≈ 6000 au) of the ionized accretion flow around a compact star cluster in formation at the center of the ...
Roberto Galván-Madrid +9 more
doaj +1 more source
Backscattering and Line Broadening in Orion
The Astronomical Journal, 2022 Examination of emission lines in high-velocity-resolution optical spectra of the Orion Nebula confirms that the velocity component on the red wing of the main ionization front emission line is due to backscattering in the Photon Dominated Region.
C. R. O’Dell +2 more
doaj +1 more source
Excited Hydroxyl Outflow in the High-mass Star-forming Region G34.26 + 0.15
The Astrophysical Journal, 2023 G34.26 + 0.15 is a region of high-mass star formation that contains a broad range of young stellar objects in different stages of evolution, including a hot molecular core, hypercompact H ii regions, and a prototypical cometary ultracompact H ii region ...
Wei Siang Tan +6 more
doaj +1 more source
Mapping Physical Conditions in Neighboring Hot Cores: NOEMA Studies of W3(H2O) and W3(OH)
The Astrophysical Journal, 2023 The complex chemistry that occurs in star-forming regions can provide insight into the formation of prebiotic molecules at various evolutionary stages of star formation.
Morgan M. Giese +3 more
doaj +1 more source
Comparing Complex Chemistry in Neighboring Hot Cores: NOEMA Studies of W3(H2O) and W3(OH)
The Astrophysical Journal, 2023 Presented here are NOEMA interferometric observations of the neighboring hot cores W3(H _2 O) and W3(OH). The presence of two star-forming cores at different evolutionary stages within the same parent cloud presents a unique opportunity to study how the ...
Will E. Thompson +3 more
doaj +1 more source
Using Strong Lines to Estimate Abundances in Extragalactic H II Regions and Starburst Galaxies [PDF]
, 2002 We have used a combination of stellar population synthesis and photoionization models to develop a set of ionization parameter and abundance diagnostics based only on the use of the strong optical emission lines.
L. Kewley +3 more
semanticscholar +1 more source
The role of Galactic H II regions in the formation of filaments [PDF]
Astronomy & Astrophysics, 2020 Context. Massive stars and their associated ionized (H II) regions could play a key role in the formation and evolution of filaments that host star formation.
A. Zavagno +15 more
semanticscholar +1 more source
Evolution of Stellar Feedback in H ii Regions [PDF]
, 2020 Stellar feedback is needed to produce realistic giant molecular clouds and galaxies in simulations, but due to limited numerical resolution, feedback must be implemented using sub-grid models.
G. Olivier +6 more
semanticscholar +1 more source
Surveying the Giant H ii Regions of the Milky Way with SOFIA: V. DR7 and K3-50
The Astrophysical Journal, 2023 We present our fifth set of results from our mid-infrared imaging survey of Milky Way Giant H ii (GH ii ) regions with our detailed analysis of DR7 and K3-50.
James M. De Buizer +3 more
doaj +1 more source
A population of hypercompact H II regions identified from young H II regions [PDF]
Astronomy & Astrophysics, 2020 Context. The derived physical parameters for young H II regions are normally determined assuming the emission region to be optically thin. However, this assumption is unlikely to hold for young H II regions such as hyper-compact H II (HC H II) and ultra ...
A. Yang +10 more
semanticscholar +1 more source