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Fluorescent Ultraviolet Spectra of Molecular Hydrogen in Star Forming Clouds
박수종,Dae-Hee Lee,Ewine F. van Dishoeck,민경욱,Youngsam Yu 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
The far-UV photons from the newly born stars make Photo-dissociation Regions (PDRs) on the surfaces of the nearby molecular clouds. In the PDRs, molecular hydrogens which absorb the far- UV photons in the Lyman-Werner bands are electrically excited, and then de-excited to the ground electrical states, emitting far-UV lines. These observations are only possible from space telescopes and can be one of the scientic purposes of the rst Korean scientic satellite. In order to prove the feasibility of observations for various celestial sources, we run a radiative transfer code to simulate the H2 uorescent lines with various physical conditions, i.e., gas density, gas temperature, external far-UV eld strength, and spectral energy distribution of the external UV eld. The code considers bound-continuum transitions as well as bound-bound transitions. The total uorescent intensities and the spectral shapes depend on the physical conditions. By observing the far-UV spectra from the PDRs, we can study the interaction of the young stars with the ambient clouds and the evolution process of the star forming clouds.
Green, Joel D.,Yang, Yao-Lun,II, Neal J. Evans,Karska, Agata,Herczeg, Gregory,Dishoeck, Ewine F. van,Lee, Jeong-Eun,Larson, Rebecca L.,Bouwman, Jeroen American Astronomical Society 2016 The Astronomical journal Vol.151 No.3
<P>We present the COPS-DIGIT-FOOSH (CDF) Herschel spectroscopy data product archive, and related ancillary data products, along with data fidelity assessments, and a user-created archive in collaboration with the Herschel-PACS and SPIRE ICC groups. Our products include datacubes, contour maps, automated line fitting results, and best 1D spectra products for all protostellar and disk sources observed with PACS in RangeScan mode for two observing programs: the DIGIT Open Time Key Program (KPOT_nevans_1 and SDP_nevans_1; PI: N.. Evans), and the FOOSH Open Time Program (OT1_jgreen02_2; PI: J. Green). In addition, we provide our best SPIRE-FTS spectroscopic products for the COPS Open Time Program (OT2_jgreen02_6; PI: J. Green) and FOOSH sources. We include details of data processing, descriptions of output products, and tests of their reliability for user applications. We identify the parts of the data set to be used with caution. The resulting absolute flux calibration has improved in almost all cases. Compared to previous reductions, the resulting rotational temperatures and numbers of CO molecules have changed substantially in some sources. On average, however, the rotational temperatures have not changed substantially (<2%), but the number of warm (T-rot similar to 300 K) CO molecules has increased by about 18%.</P>