Results 1 to 10 of about 3,849,349 (342)
Expansive components in H II regions [PDF]
Astronomy & Astrophysics, 2005 16 pages, 9 figures, accepted for publication in A& ...
Relano, M., Beckman, J. E.
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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, Michael L. Norman
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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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Diffuse continuum transfer in H���ii regions [PDF]
Monthly Notices of the Royal Astronomical Society, 2009 12 pages, 7 figures, to be published in ...
Williams, R. J. R., Henney, W. J.
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New Infrared Sources Associated with H II Regions [PDF]
Symposium - International Astronomical Union, 1973 Photometry and mapping in the wavelength range 1.65–20 μ of the H II regions W3 and NGC 7538 have led to the discovery of a dozen new infrared emission sources. The sources have flux densities ranging up to 10–23 Wm–2 Hz–1 at 20 μ and diameters from < 3 to 40″.
C. G. Wynn‐Williams +2 more
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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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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
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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
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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
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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
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