PHANGS–JWST First Results: Destruction of the PAH Molecules in H ii Regions Probed by JWST and MUSE [PDF]
The Astrophysical Journal Letters, 2023 Polycyclic aromatic hydrocarbons (PAHs) play a critical role in the reprocessing of stellar radiation and balancing the heating and cooling processes in the interstellar medium but appear to be destroyed in H ii regions.
Oleg V. Egorov +32 more
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Metallicity Structure in the Milky Way Disk Revealed by Galactic H ii Regions [PDF]
Astrophysical Journal, 2019 The metallicity structure of the Milky Way disk stems from the chemodynamical evolutionary history of the Galaxy. We use the National Radio Astronomy Observatory Karl G.
Trey V. Wenger +3 more
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Ionization Front Instabilities in Primordial H
, 2008 Radiative cooling by metals in shocked gas mediates the formation of ionization front instabilities in the galaxy today that are responsible for a variety of phenomena in the interstellar medium, from the morphologies of nebulae to triggered star ...
Daniel Whalen +3 more
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Atomic processes in planetary nebulae and H ii regions [PDF]
, 2009 Spectroscopic studies of Planetary Nebulae (PNe) and H {\sc ii} regions have driven much development in atomic physics. In the last few years the combination of a generation of powerful observatories, the development of ever more sophisticated spectral ...
M. A. Bautista
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The Astrophysical JournalThis study examines the mid-infrared properties of Giant H ii (GH ii ) regions in the Milky Way’s Central Molecular Zone (CMZ)—Sgr B1, Sgr B2, and Sgr C—using SOFIA-FORCAST imaging at 25 and 37 μ m.
James M. De Buizer +3 more
doaj +2 more sources
A search for hypercompact H
, 2018 22 pages, 8 figures, 6 tables, accepted by MNRASWe have carried out the largest and most unbiased search for hypercompact (HC) H II regions. Our method combines four interferometric radio continuum surveys (THOR, CORNISH, MAGPIS, and White2005) with far ...
A. Y. Yang +5 more
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ATOMS: ALMA three-millimeter observations of massive star-forming regions – III. Catalogues of candidate hot molecular cores and hyper/ultra compact H ii regions [PDF]
Monthly notices of the Royal Astronomical Society, 2021 We have identified 453 compact dense cores in 3 mm continuum emission maps in the ALMA Three-millimetre Observations of Massive Star-forming regions survey, and compiled three catalogues of high-mass star-forming cores.
Hongli Liu +52 more
semanticscholar +1 more source
Ionization correction factors and dust depletion patterns in giant H ii regions [PDF]
, 2021 We provide new ionization correction factors (ICFs) for carbon, nitrogen, neon, sulfur, chlorine, and argon in giant H ii regions. The ICFs were computed using the most representative photoionization models from a large initial grid.
A. Amayo +2 more
semanticscholar +1 more source
Oxygen and helium abundances in Galactic H II regions -- II. Abundance gradients [PDF]
, 2000 L. Deharveng +3 more
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Spatially Resolved Temperature and Density Structures of Nearby H ii Regions
The Astrophysical Journal, 2023 Photoionization models frequently assume constant temperature or density within H ii regions. We investigate this assumption by measuring the detailed temperature and density structures of four H ii regions in the Large Magellanic Cloud and the Small ...
Yifei Jin +3 more
doaj +1 more source