Evidence for a Dense, Cold Screen towards IRAS 18507+0121

Ramesh B.; Bronfman L.; Deguchi S.

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Evidence for a Dense, Cold Screen towards IRAS 18507+0121

机译：对IRAS 18507 + 0121进行密集冷屏的证据

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Self-absorbedprofileshasbeenseentowardsthecorecontainingIRAS18507+0121,aprobablehigh-massprotostar,inthemillimeterwavelinesofHCO+,H13CO+,CS,andC34S.Especially,theJ=1a?’0lineofH13CO+,isfoundtobestrongerthanthatofHCO+.Wehavemodeledthiscoreinordertodeterminethephysicalconditionsinit.Togeneratesyntheticspectrafromthemodelcore,weusedamulti-level,non-LTEradiativetransfercodethatemploysalarge-velocity-gradientapproximationinordertoestimatethelevelpopulations.Ithasbeendemonstratedthatthelineprofilescanbeexplainedbyacollapsinghotcorehiddenbehindacold(a??4K)anddense(3?—104cma?’3)intervening,butcomoving,screenorenvelope.Themodelparametersadjustedtoreproducetheobservedprofilesare(a)thetemperature,density,andvelocityfieldsinthemodelcoreand(b)thetemperature,density,andlinewidthinthescreen.Comparingtheobservedprofileswiththemodelspectraatboththeon-centerandoneoff-centerpositions,wehavebeenabletoreliablydeterminethephysicalconditionsinthecore.

机译：自absorbedprofileshasbeenseentowardsthecorecontainingIRAS18507 + 0121，aprobablehigh-massprotostar，inthemillimeterwavelinesofHCO +，H13CO +，CS，andC34S.Especially，theJ = 1A？'0lineofH13CO +，isfoundtobestrongerthanthatofHCO + .Wehavemodeledthiscoreinordertodeterminethephysicalconditionsinit.Togeneratesyntheticspectrafromthemodelcore，weusedamulti级，非LTEradiativetransfercodethatemploysalarge网速度gradientapproximationinordertoestimatethelevelpopulations.Ithasbeendemonstratedthatthelineprofilescanbeexplainedbyacollapsinghotcorehiddenbehindacold（一个?? 4K）和密集的（3？-104cma？3）插在中间，但要进行通风，屏蔽或包络。调整模型参数以生成所观察到的轮廓的是（a）模型核心的温度，密度和速度场，并且（b）可以将屏幕上的中心保持在可以看到的轮廓的中心处，并且可以与之保持一致。

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《PASJ: Publications of the Astronomical Society of Japan》 |1997年第3期|共页
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Ramesh B.; Bronfman L.; Deguchi S.;
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Evidence for a Dense, Cold Screen towards IRAS 18507+0121

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