Multi-wavelength study of triggered star formation around 25 H II regions
نویسندگان
چکیده
منابع مشابه
A VLA Search for Water Masers in Six H ii Regions: Tracers of Triggered Low-Mass Star Formation
We present a search for water maser emission at 22 GHz associated with young low-mass protostars in six H ii regions —M16, M20, NGC 2264, NGC 6357, S125, and S140. The survey was conducted with the NRAO Very Large Array from 2000 to 2002. For several of these H ii regions, ours are the first high-resolution observations of water masers. We detected 16 water masers: eight in M16, four in M20, th...
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Context. Statistical methods for quantifying clustering have not yet been tested against anti-clustered data. Aims. We investigate the performance of the normalised correlation length, s̄, and Q when applied to anti-clustered data. Methods. We tested the operation of s̄ on simulated data and recently published observations. Results. s̄ successfully distinguishes anticlustered data in simulations a...
متن کاملDynamical Expansion of Ionization and Dissociation Front around a Massive Star. II. On the Generality of Triggered Star Formation
We analyze the dynamical expansion of the H II region, photodissociation region, and the swept-up shell, solving the UVand FUV-radiative transfer, the thermal and chemical processes in the time-dependent hydrodynamics code. Following our previous paper, we investigate the time evolutions with various ambient number densities and central stars. Our calculations show that basic evolution is quali...
متن کاملStar formation in bar environments ⋆ II . Physical properties , age and abundances of H ii regions
The nebular properties (electronic density, extinction , age, O/H abundances) of H ii regions found along the bars of the sample of barred spiral galaxies studied by Martin & Friedli (1997) are examined. From line ratio diagnostic diagrams, it is showed that regions located along the major axis of the bars have a normal photoionization spectrum, that is, line ratios reproductible from nebular c...
متن کاملDynamical Formation of the Dark Molecular Hydrogen Clouds around Diffuse H II Regions
We examine the triggering process of molecular cloud formation around diffuse H II regions. We calculate the time evolution of the shell as well as of the H II region in a two-phase neutral medium, solving the UV and FUV radiative transfer, the thermal and chemical processes in the time-dependent hydrodynamics code. In the cold neutral medium, the ambient gas is swept up in the cold (T ∼ 30− 40...
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ژورنال
عنوان ژورنال: Research in Astronomy and Astrophysics
سال: 2013
ISSN: 1674-4527
DOI: 10.1088/1674-4527/14/1/004