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• W3103801316 endingPage "102" @default.
• W3103801316 startingPage "102" @default.
• W3103801316 abstract "We present ∼2' × 2' spectral-maps of Orion Becklin–Neugebauer/Kleinmann–Low (BN/KL) outflows taken with Herschel at ∼12'' resolution. For the first time in the far-IR domain, we spatially resolve the emission associated with the bright H2 shocked regions Peak 1 and Peak 2 from that of the hot core and ambient cloud. We analyze the ∼54–310 μm spectra taken with the PACS and SPIRE spectrometers. More than 100 lines are detected, most of them rotationally excited lines of 12CO (up to J = 48–47), H2O, OH, 13CO, and HCN. Peaks 1/2 are characterized by a very high L(CO)/LFIR ≈ 5 × 10−3 ratio and a plethora of far-IR H2O emission lines. The high-J CO and OH lines are a factor of ≈2 brighter toward Peak 1 whereas several excited H2O lines are ≲50% brighter toward Peak 2. Most of the CO column density arises from Tk ∼ 200–500 K gas that we associate with low-velocity shocks that fail to sputter grain ice mantles and show a maximum gas-phase H2O/CO ≲ 10−2 abundance ratio. In addition, the very excited CO (J > 35) and H2O lines reveal a hotter gas component (Tk ∼ 2500 K) from faster (vS > 25 km s−1) shocks that are able to sputter the frozen-out H2O and lead to high H2O/CO ≳ 1 abundance ratios. The H2O and OH luminosities cannot be reproduced by shock models that assume high (undepleted) abundances of atomic oxygen in the preshock gas and/or neglect the presence of UV radiation in the postshock gas. Although massive outflows are a common feature in other massive star-forming cores, Orion BN/KL seems more peculiar because of its higher molecular luminosities and strong outflows caused by a recent explosive event." @default.
• W3103801316 created "2020-11-23" @default.
• W3103801316 creator A5004002392 @default.
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• W3103801316 creator A5067553889 @default.
• W3103801316 date "2015-01-20" @default.
• W3103801316 modified "2023-09-30" @default.
• W3103801316 title "<i>HERSCHEL</i>FAR-INFRARED SPECTRAL-MAPPING OF ORION BN/KL OUTFLOWS: SPATIAL DISTRIBUTION OF EXCITED CO, H₂O, OH, O, AND C⁺IN SHOCKED GAS" @default.
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