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- W2008707893 abstract "We have observed near-infrared H2 vibrational line emission from dense (n ≳ 104 cm-3) photon-dominated regions (PDRs) along the Orion A molecular cloud ridge and toward the Orion B molecular cloud near NGC 2024. Specifically, we have observed the 1.601 μm v = 6-4 Q(1), 2.121 μm v = 1-0 S(1), and 2.247 μm v = 2-1 S(1) lines of H2. To assess the physical state of the PDRs, we combine our H2 data with observations of the [O I] 63 μm, [O I] 146 μm, and [C II] 158 μm atomic fine-structure lines along the same lines of sight. We use our data to study how the character of the H2 emission depends on the PDR conditions. For the range of densities (104-105 cm-3) and incident far-ultraviolet fluxes (103-105 times the mean interstellar field) in the PDRs, we find that the relative H2 line strengths are characteristic of both low gas density and high gas density UV-excited emission. In Orion, we observe direct evidence of the transition from the (low-density) regime in which the H2 vibrational cascade is dominated by radiative transitions to the (high-density) regime in which collisions influence the vibrational cascade. Our observations show that, for Orion-type abundances and physical conditions, collisions begin to influence the H2 ro-vibrational line ratios near a gas density of 5 × 104 cm-3." @default.
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- W2008707893 date "1997-06-10" @default.
- W2008707893 modified "2023-09-23" @default.
- W2008707893 title "Near‐Infrared H2and Associated O0and C+Emission from Dense Photon‐dominated Regions" @default.
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- W2008707893 doi "https://doi.org/10.1086/304128" @default.
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