ar X iv : a st ro - p h / 03 02 30 4 v 1 1 5 Fe b 20 03 THE FAR INFRARED CO LINE EMISSION OF ORION BN
نویسندگان
چکیده
We present observations of the closest region of high mass star formation, Orion BN/KL, performed at both low resolution mode (grating mode) and high resolution (Fabry-Pérot mode) with the Long Wavelength Spectrometer (LWS) on board the Infrared Space Observatory (ISO). We detected the CO rotational transitions from J up = 15 to J up = 49. A LVG analysis of the line fluxes allows to distinguish three main physical components with different temperatures, densities and column densities. Our analysis yields to conclude than J up <15 arise from the pho-todissociation region (PDR), the emission between J up = 20 and 30 arise from the high velocity outflow (plateau), and J up > 32 arises from a hot and dense gas component. The latter exhibits broadened lines for the levels J up > 32 and is thought to be due to shocked gas in a high velocity outflow. Future observations with HIFI, onboard the Far Infrared Space Telescope (FIRST) will allow the spectral separation of the PDR and the plateau components, unresolved with ISO, and characterise more precisely the Orion BN/KL star forming region.
منابع مشابه
ar X iv : a st ro - p h / 03 02 30 4 v 2 3 A ug 2 00 3 THE FAR INFRARED CO LINE EMISSION OF ORION
We present observations of the closest region of high mass star formation, Orion BN/KL, performed at both low resolution mode (grating mode) and high resolution (Fabry-Pérot mode) with the Long Wavelength Spectrometer (LWS) on board the Infrared Space Observatory (ISO). We detected the CO rotational transitions from J up = 15 to J up = 49. A LVG analysis of the line fluxes allows to distinguish...
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