أعرض تسجيلة المادة بشكل مبسط

dc.creator Goicoechea, Javier R.
dc.creator Cernicharo, José
dc.creator Daniel, Fabien
dc.creator Barlow, Michael J.
dc.creator Swinyard, Bruce M.
dc.creator Lim, Tanya L.
dc.creator Viti, S.
dc.creator Yates, J.
dc.date 2007-12-27T16:06:58Z
dc.date 2007-12-27T16:06:58Z
dc.date 2006-03-03
dc.date.accessioned 2017-01-31T00:59:33Z
dc.date.available 2017-01-31T00:59:33Z
dc.identifier arXiv:astro-ph/0603077v1
dc.identifier http://hdl.handle.net/10261/2620
dc.identifier.uri http://dspace.mediu.edu.my:8181/xmlui/handle/10261/2620
dc.description Accepted in ApJ letters, 2006 March 2
dc.description As part of the first far-IR line survey towards Orion KL, we present the detection of seven new rotationally excited OH Lambda-doublets (at 48, 65, 71, 79, 98 and 115 um). Observations were performed with the Long Wavelength Spectrometer (LWS) Fabry-Perots on board the Infrared Space Observatory (ISO). In total, more than 20 resolved OH rotational lines, with upper energy levels up to 620 K, have been detected at an angular and velocity resolutions of 80$'' and 33 km s^-1 respectively. OH line profiles show a complex behavior evolving from pure absorption, P-Cygni type to pure emission. We also present a large scale 6' declination raster in the OH ^2\Pi_3/2 J=5/2^+-3/2^- and ^2\Pi_3/2 J=7/2^-5/2^+ lines (at 119.441 and 84.597 um) revealing the decrease of excitation outside the core of the cloud. From the observed profiles, mean intrinsic line widths and velocity offsets between emission and absorption line peaks we conclude that most of the excited OH arises from Orion outflow(s), i.e. the ``plateau'' component. We determine an averaged OH abundance relative to H_2 of X(OH)=(0.5-1.0)x10^-6, a kinetic temperature of 100 K and a density of n(H_2)=5x10^5 cm^-3. Even with these conditions, the OH excitation is heavily coupled with the strong dust continuum emission from the inner hot core regions and from the expanding flow itself.
dc.description Peer reviewed
dc.format 747560 bytes
dc.format application/pdf
dc.language eng
dc.relation Preprint
dc.rights openAccess
dc.subject Infrared: ISM
dc.subject ISM: individual (Orion KL)
dc.subject ISM: jets and outflows
dc.subject ISM: molecules
dc.subject Radiative transfer
dc.title Far-IR Excited OH Lines from Orion KL Outflows
dc.type Pre-print


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أعرض تسجيلة المادة بشكل مبسط