H II regions,
Radiation hydrodynamic simulations of massive star formation via gravitationally trapped H II regions - spherically symmetric ionized accretion flows
... The next paper in this series will investigate the discovered instability analytically as well as with a 1D code capable of much higher resolution than our idealized 3D simulations. The simula- tions presented in this ...
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Line Emission from Radiation-pressurized H II Regions. II. Dynamics and Population Synthesis
... of H ii regions in general; instead, it is driven by Kewley et ...of H ii regions, and the limitations on density and ionizing luminosity that these assumptions ...
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Heavy elements in Galactic and Magellanic Cloud H ii regions: recombination-line versus forbidden-line abundances
... ) H- deficient inclusions, immersed in hot gas with normal ...O II ORLs from our sample of H II regions origi- nate from cold, low-density, ionized and metal-rich regions located ...
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PAHs and star formation in the H II regions of nearby galaxies M83 and M33
... iii]/[Ne ii] ratio, the increase in Ne and S ratios corresponds to an increase in the ionization index and a decrease in ...the regions from Gordon et ...the H ii regions in M83 and M33 ...
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The coordinated radio and infrared survey for high-mass star formation III. A catalogue of northern ultra-compact H II regions
... J, H, and K fluxes, assuming the diffuse emission is due to purely nebular gas ...the H − K colours to appear redder, and scattered light (due to dust grains) at shorter wavelengths results in bluer J − ...
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A Spatially Resolved Study of Cold Dust, Molecular Gas, H II Regions, and Stars in the z = 2 12 Submillimeter Galaxy ALESS67 1
... HST H -band imaging, we used the 8 × 8 00 field of view mode of SINFONI. To achieve high spatial resolution, we employed natural guide star (NGS) AO correction ex- ploiting a nearby bright (R = 12.9 mag) star. ...
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On the association between core-collapse supernovae and H II regions
... The past decade has seen major advances in establishing the pro- genitors of core-collapse supernovae (ccSNe; Smartt 2009). Three discrete subpopulations of hydrogen-rich ccSNe are known exhibit- ing plateau’s ...
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Model of Hydrogen Deficient Nebulae in H II Regions at High Temperature
... The simplest and most frequently used model in hydrogen deficient nebula is dedicated to determine ioniza- tion structure of H, He, O, temperature and density of electron profiles [4]. To do so, we develop both ...
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Before the first supernova : combined effects of H II regions and winds on molecular clouds
... (ii) Magnetic fields, which are likely to depress the overall rate of star formation on large and small scales. Numerous recent studies (e.g. Price & Bate 2009; Wang et al. 2010; Padoan & Nordlund 2011; ...
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The structure of the southern Milky Way
... Chapter 5 contains a summary of the results obtained in chapters 2, 3, and 4. From the studies carried out, the distances of the stellar groupings are incorporated with those of other population I objects to define more ...
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The Red MSX Source Survey: The Massive Young Stellar Population of Our Galaxy
... UCHII regions exists from the recently completed CORNISH blind radio survey (Purcell et ...compact H ii region catalog (Urquhart et ...UCHII regions that lie within the union of the boundaries ...
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How extreme are the Wolf-Rayet clusters in NGC 3125?
... Previous studies of the O star populations have been based on Hβ fluxes derived from slit spectroscopy. Kunth & Sargent (1981) and VC92 assumed that WR stars do not contribute to the Lyman con- tinuum and estimate O ...
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Toward a Removal of Temperature Dependencies from Abundance Determinations: NGC 628
... the H ii regions by combining the far-IR observations of the Kingfish program with matched mid-IR observations available from the Spitzer infrared nearby galaxies survey (Sings; Kennicutt et ...
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ATLASGAL - towards a complete sample of massive star forming clumps
... same clump. There are 39 of these positional coincidences in the distance-limited sample, which corresponds to approximately half of all of the methanol masers associated with the multiphase clumps (76 in total). As a ...
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The effects of spatial resolution on integral field spectrograph surveys at different redshifts The CALIFA perspective
... of H ii regions, Thilker et ...star-forming regions, being in general located in the LINER-like region of the BTP diagram (Singh et ...
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No temperature fluctuations in the giant H II region H 1013
... One problem that still needs examination is the density structure. Our best model, M1, requires a volume filling factor of 0.005. This is not uncommon for giant H ii regions (e.g. Luridiana et al. ...
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High mass starless clumps in the inner galactic plane: the sample and dust properties
... - < < . This sample has been singled out from 10,861 ATLASGAL clumps. None of these sources are associated with any known star-forming activities collected in SIMBAD and young stellar objects identi fi ed using ...
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The dependence of H ii region properties on global and local surface brightness within galaxy discs
... HSB regions than for those within LSB ...LSB regions are relatively old ( ∼ 6 Myr) and the clusters within HSB regions are significantly younger (1 Myr), the value of N ∗,max can be roughly the ...
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STARBENCH: the D-type expansion of an H II region
... A hot, massive star emits large numbers of extreme ultraviolet (EUV) photon with energy hν larger than the ionization poten- tial of hydrogen (13.6eV). The ionizing photons interact with the surrounding neutral medium ...
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Photoionization Modelling of H II Region for Oxygen Ions
... of H II regions, the intensity ratio are sensitive to different parameters: the abundance of the ele- ment, the temperature of the radiation supplied by the ionizing stars, the ionization parameter, ...
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