Results 1 to 10 of about 4,605,994 (345)
The Growth of H II Regions During Reionization [PDF]
, 2004 Recently, there has been a great deal of interest in understanding the reionization of hydrogen in the intergalactic medium (IGM). One of the major outstanding questions is how this event proceeds on large scales.
S. Furlanetto +2 more
semanticscholar +1 more source
The Astrophysical JournalWe employ observations of the 205 μ m [N ii ] fine structure (FS) line and radio recombination line (RRL) emission to derive the electron density in 10 well-known H ii regions. The combination of these two spectral lines (the RRL–FS line method) provides
Paul. F. Goldsmith +4 more
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Massive Star Formation in the Ultraviolet Observed with the Hubble Space Telescope
Galaxies, 2020 Spectroscopic observations of a massive star formation in the ultraviolet and their interpretation are reviewed. After a brief historical retrospective, two well-studied resolved star clusters and the surrounding H II regions are introduced: NGC 2070 in ...
Claus Leitherer
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The Detection of Higher-order Millimeter Hydrogen Recombination Lines in the Large Magellanic Cloud
The Astrophysical Journal, 2023 We report the first extragalactic detection of the higher-order millimeter hydrogen recombination lines (Δ n > 2). The γ -, ϵ -, and η -transitions have been detected toward the millimeter continuum source N 105–1 A in the star-forming region N 105 in ...
Marta Sewiło +12 more
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The Astrophysical Journal, 2023 The paper presents an analysis of multiwavelength data of a nearby star-forming site, the IC 5146 dark streamer ( d ∼ 600 pc), which has been treated as a single and long filament, fl .
L. K. Dewangan +7 more
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FINDING DISTANT GALACTIC H ii REGIONS [PDF]
, 2015 The WISE Catalog of Galactic H ii Regions contains ∼2000 H ii region candidates lacking ionized gas spectroscopic observations. All candidates have the characteristic H ii region mid-infrared morphology of WISE 12 &mgr; m ?> emission surrounding 22 &mgr;
L. Anderson +7 more
semanticscholar +1 more source
The Astrophysical Journal, 2023 We present a comprehensive analysis of the Galactic mid-infrared bubble [HKS2019] E70 (E70) by adopting a multiwavelength approach to understand the physical environment and star formation scenario around it.
Aayushi Verma +10 more
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NEW STRONG-LINE ABUNDANCE DIAGNOSTICS FOR H ii REGIONS: EFFECTS OF κ-DISTRIBUTED ELECTRON ENERGIES AND NEW ATOMIC DATA [PDF]
, 2013 Recently, Nicholls et al., inspired by in situ observations of solar system astrophysical plasmas, suggested that the electrons in H ii regions are characterized by a κ-distribution of energies rather than a simple Maxwell–Boltzmann distribution.
M. Dopita +4 more
semanticscholar +1 more source
DISRUPTION OF MOLECULAR CLOUDS BY EXPANSION OF DUSTY H II REGIONS [PDF]
, 2016 Dynamical expansion of H ii regions around star clusters plays a key role in dispersing the surrounding dense gas and therefore in limiting the efficiency of star formation in molecular clouds.
Jeong-Gyu Kim +2 more
semanticscholar +1 more source
The Astrophysical Journal Supplement SeriesWe use the H41 α recombination line to create templates of the millimeter free–free emission in the ALMA-IMF continuum maps, which allows us to separate it from dust emission.
Roberto Galván-Madrid +27 more
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