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- W3208978774 abstract "We have measured the gas temperature in the IC 63 photodissociation region (PDR) using the S(1) and S(5) pure rotation lines of molecular hydrogen with SOFIA/EXES. We divide the PDR into three regions for analysis based on the illumination from $gamma$ Cas: sunny, ridge and shady. Constructing rotation diagrams for the different regions, we obtain temperatures of T$_{ex}$=$562^{+52}_{-43}$ K towards the ridge and T$_{ex}$=$495^{+28}_{-25}$ K in the shady side. The H$_2$ emission was not detected on the sunny side of the ridge, likely due to the photo-dissociation of H$_2$ in this gas. Our temperature values are lower than the value of T$_{ex}$=685$pm$68 K using the S(1), S(3), and S(5) pure rotation lines, derived by Thi et al. (2009) using lower spatial-resolution ISO-SWS data at a different location of the IC 63 PDR. This difference indicates that the PDR is inhomogeneous and illustrates the need for high-resolution mapping of such regions to fully understand their physics. The detection of a temperature gradient correlated with the extinction into the cloud, points to the ability of using H$_2$ pure rotational line spectroscopy to map the gas temperature on small scales. We used a PDR model to estimate the FUV radiation and corresponding gas densities in IC 63. Our results shows the capability of SOFIA/EXES to resolve and provide detailed information on the temperature in such regions." @default.
- W3208978774 created "2021-11-08" @default.
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- W3208978774 date "2021-10-22" @default.
- W3208978774 modified "2023-09-27" @default.
- W3208978774 title "Spatial variation in temperature and density in the IC 63 PDR from $rm H_{2}$ Spectroscopy" @default.
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