Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...686.1155l&link_type=abstract
The Astrophysical Journal, Volume 686, Issue 2, pp. 1155-1161.
Astronomy and Astrophysics
Astronomy
4
Ism: Individual (Ophiuchus), Ism: Lines And Bands, Ultraviolet: Ism
Scientific paper
We present the first far-ultraviolet (FUV; 1370-1670 Å) image of the Ophiuchus molecular cloud region, observed with the SPEAR imaging spectrograph. The flux levels of the diffuse FUV continuum are in reasonable agreement with those of the Voyager observations in the shorter FUV wavelengths (912-1216 Å), provided that the diffuse FUV emission is dominated by the spectra from late O- and early B-type stars. The observed region of the present study was divided into five subregions according to their FUV intensities, and the spectrum was obtained for each subregion with prominent H2 fluorescent emission lines. A synthetic model of the H2 fluorescent emission indicates that the molecular cloud has more or less uniform physical parameters over the Ophiuchus region, with a hydrogen density nH of 500 cm-3 and a H2 column density N(H2) of 2×1020 cm-2. It is notable that the observed diffuse FUV continuum is well reproduced by a single-scattering model with scattered starlight from the dust cloud located at ~120-130 pc, except at a couple of regions with high optical depth. The model also gives reasonable properties of the dust grains of the cloud with an albedo a of 0.36+/-0.20 and a phase function asymmetry factor g of 0.52+/-0.22.
Edelstein José
Korpela Eric J.
Lee Dong Hwan
Min Kyoung-Wook
Park Se Young
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