Ammonia observations of bright-rimmed clouds : establishing a sample of triggered protostars

@article{Morgan2010AmmoniaOO,
  title={Ammonia observations of bright-rimmed clouds : establishing a sample of triggered protostars},
  author={Larry Morgan and Charles C. Figura and J. S. Urquhart and Mark A. Thompson},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2010},
  volume={408},
  pages={157-169}
}
We observed 42 molecular condensations within previously identified bright-rimmed clouds in the ammonia rotational inversion lines NH3(1,1), (2,2), (3,3) and (4,4) using the Green Bank Telescope in Green Bank, West Virginia. Using the relative peaks of the ammonia lines and their hyperfine satellites we have determined important parameters of these clouds, including rotational temperatures and column densities. These observations confirm the presence of dense gas towards IRAS point… 

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References

SHOWING 1-10 OF 39 REFERENCES
A tale of two cores: Triggered massive star formation in the bright-rimmed cloud SFO 75
Context. Bright-rimmed clouds (BRCs) are isolated molecular clouds located on the edges of evolved HII regions. Star formation within the BRCs may have been triggered through the propagation of
Radio continuum and molecular line observations of four bright-rimmed clouds
Aims. To search for evidence of triggered star formation within four bright-rimmed clouds, SFO 58, SFO 68, SFO 75 and SFO 76. Methods. We present the results of radio continuum and molecular line
Observational study of sites of triggered star formation - CO and mid-infrared observations
Context. Bright-rimmed clouds (BRCs) are isolated molecular clouds located on the edges of evolved HII regions. Star formation within these clouds may have been triggered through the propagation of
A SCUBA survey of bright-rimmed clouds
Context . Bright-rimmed clouds (BRCs) are potential examples of triggered star formation regions, in which photoionisation driven shocks caused by the expansion of HII regions induce protostellar
Searching for signs of triggered star formation toward IC 1848
We have carried out an in-depth study of three bright-rimmed clouds SFO 11, SFO 11NE and SFO 11E associated with the HII region IC 1848, using observations carried out at the James Clerk Maxwell
H2O maser emission from bright rimmed clouds in the southern hemisphere
Water maser emission is a powerful tracer of the presence of embedded sources in dense clouds since it requires elevated temperatures (>100 K) and densities (>107 cm−3) that can be found in
High-mass star formation within the bright-rimmed cloud SFO 79
We report Radio Recombination Line (RRL) and continuum observations toward the IRAS point source 16362−4845, embedded within the Bright-Rimmed Cloud (BRC) SFO 79, a small molecular cloud lying at the
A Compact Array imaging survey of southern bright-rimmed clouds
We have carried out a radio-wavelength imaging survey of 45 bright-rimmed clouds (BRCs), using the Australia Telescope Compact Array to characterise the physical properties in their ionised boundary
A Catalog of Bright-rimmed Clouds with IRAS Point Sources: Candidates for Star Formation by Radiation-driven Implosion. I. The Northern Hemisphere
Forty-four bright-rimmed clouds associated with IRAS sources have been selected from the Palomar Sky Survey prints. They are good candidates for the sites of star formation induced by
Triggered star formation in bright-rimmed clouds: the Eagle nebula revisited
A three dimensional Smoothed Particle Hydrodynamical (SPH) model has been extended to study the radiative driven implosion effect of massive stars on the dynamical evolutions of surrounding molecular
...
1
2
3
4
...