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- W3103896703 abstract "We have obtained moderate-resolution (R ~ 3000) spectra of the Orion bar and Orion S regions at J (1.25 μm), H (1.64 μm), and K (2.2 μm). Toward the bar, the observations reveal a large number of H2 emission lines that, when compared to model predictions of Draine & Bertoldi, are indicative of a high-density photodissociation region (PDR) (nH = 106 cm-3, χ = 105, T0 = 1000 K) rather than of shocked material. Behind the bar and into the molecular cloud, the H2 spectrum again matches well with that predicted for a dense PDR (nH = 106 cm-3) but with a lower temperature (T0 = 500 K) and UV field strength (χ = 104). The H2 spectrum and stratification of near-IR emission lines (O I, H I, [Fe II], [Fe III], H2) near Orion S imply the presence of a dense PDR with an inclined geometry in this region (nH = 106 cm-3, χ = 105, T0 = 1500 K). The extinction measurements toward the bar (AK ~ 2.6) and Orion S (AK ~ 2.1) H2 emission regions are much larger than expected from either face-on (AK ~ 0.1) or edge-on (AK ~ 1) homogeneous PDRs, indicating that clumps may significantly affect the structure of the PDRs." @default.
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- W3103896703 date "1998-06-01" @default.
- W3103896703 modified "2023-10-18" @default.
- W3103896703 title "Near‐Infrared Spectroscopy of Photodissociation Regions: The Orion Bar and Orion S" @default.
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- W3103896703 doi "https://doi.org/10.1086/305682" @default.
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